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_compare_rule(struct connman_iptables *table,
 906                                 struct ipt_ip *ip, char *chain_name,
 907                                 char *target_name, struct xtables_target *xt_t,
 908                                 struct xtables_match *xt_m,
 909                                 struct xtables_rule_match *xt_rm)
 910 {
 911         struct connman_iptables_entry *entry;
 912         GList *found;
 913
 914         found = find_existing_rule(table, ip, chain_name, target_name,
 915                                                         xt_t, xt_m, xt_rm);
 916         if (found == NULL)
 917                 return -EINVAL;
 918
 919         entry = found->data;
 920         if (entry == NULL)
 921                 return -EINVAL;
 922
 923         return 0;
 924 }
 925
 926
 927 static int iptables_change_policy(struct connman_iptables *table,
 928                                         char *chain_name, char *policy)
 929 {
 930         GList *chain_head;
 931         struct connman_iptables_entry *entry;
 932         struct xt_entry_target *target;
 933         struct xt_standard_target *t;
 934         int verdict;
 935
 936         verdict = target_to_verdict(policy);
 937         if (verdict == 0)
 938                 return -EINVAL;
 939
 940         chain_head = find_chain_head(table, chain_name);
 941         if (chain_head == NULL)
 942                 return -EINVAL;
 943
 944         entry = chain_head->data;
 945         if (entry->builtin < 0)
 946                 return -EINVAL;
 947
 948         target = ipt_get_target(entry->entry);
 949
 950         t = (struct xt_standard_target *)target;
 951         t->verdict = verdict;
 952
 953         return 0;
 954 }
 955
 956 static struct ipt_replace *iptables_blob(struct connman_iptables *table)
 957 {
 958         struct ipt_replace *r;
 959         GList *list;
 960         struct connman_iptables_entry *e;
 961         unsigned char *entry_index;
 962
 963         r = g_try_malloc0(sizeof(struct ipt_replace) + table->size);
 964         if (r == NULL)
 965                 return NULL;
 966
 967         memset(r, 0, sizeof(*r) + table->size);
 968
 969         r->counters = g_try_malloc0(sizeof(struct xt_counters)
 970                                 * table->old_entries);
 971         if (r->counters == NULL) {
 972                 g_free(r);
 973                 return NULL;
 974         }
 975
 976         strcpy(r->name, table->info->name);
 977         r->num_entries = table->num_entries;
 978         r->size = table->size;
 979
 980         r->num_counters = table->old_entries;
 981         r->valid_hooks  = table->info->valid_hooks;
 982
 983         memcpy(r->hook_entry, table->hook_entry, sizeof(table->hook_entry));
 984         memcpy(r->underflow, table->underflow, sizeof(table->underflow));
 985
 986         entry_index = (unsigned char *)r->entries;
 987         for (list = table->entries; list; list = list->next) {
 988                 e = list->data;
 989
 990                 memcpy(entry_index, e->entry, e->entry->next_offset);
 991                 entry_index += e->entry->next_offset;
 992         }
 993
 994         return r;
 995 }
 996
 997 static void dump_ip(struct ipt_entry *entry)
 998 {
 999         struct ipt_ip *ip = &entry->ip;
1000         char ip_string[INET6_ADDRSTRLEN];
1001         char ip_mask[INET6_ADDRSTRLEN];
1002
1003         if (strlen(ip->iniface))
1004                 connman_info("\tin %s", ip->iniface);
1005
1006         if (strlen(ip->outiface))
1007                 connman_info("\tout %s", ip->outiface);
1008
1009         if (inet_ntop(AF_INET, &ip->src, ip_string, INET6_ADDRSTRLEN) != NULL &&
1010                         inet_ntop(AF_INET, &ip->smsk,
1011                                         ip_mask, INET6_ADDRSTRLEN) != NULL)
1012                 connman_info("\tsrc %s/%s", ip_string, ip_mask);
1013
1014         if (inet_ntop(AF_INET, &ip->dst, ip_string, INET6_ADDRSTRLEN) != NULL &&
1015                         inet_ntop(AF_INET, &ip->dmsk,
1016                                         ip_mask, INET6_ADDRSTRLEN) != NULL)
1017                 connman_info("\tdst %s/%s", ip_string, ip_mask);
1018 }
1019
1020 static void dump_target(struct connman_iptables *table,
1021                                 struct ipt_entry *entry)
1022
1023 {
1024         struct xtables_target *xt_t;
1025         struct xt_entry_target *target;
1026
1027         target = ipt_get_target(entry);
1028
1029         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
1030                 struct xt_standard_target *t;
1031
1032                 t = (struct xt_standard_target *)target;
1033
1034                 switch (t->verdict) {
1035                 case XT_RETURN:
1036                         connman_info("\ttarget RETURN");
1037                         break;
1038
1039                 case -NF_ACCEPT - 1:
1040                         connman_info("\ttarget ACCEPT");
1041                         break;
1042
1043                 case -NF_DROP - 1:
1044                         connman_info("\ttarget DROP");
1045                         break;
1046
1047                 case -NF_QUEUE - 1:
1048                         connman_info("\ttarget QUEUE");
1049                         break;
1050
1051                 case -NF_STOP - 1:
1052                         connman_info("\ttarget STOP");
1053                         break;
1054
1055                 default:
1056                         connman_info("\tJUMP @%p (0x%x)",
1057                                 (char*)table->blob_entries->entrytable +
1058                                 t->verdict, t->verdict);
1059                         break;
1060                 }
1061
1062                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
1063                                                 XTF_LOAD_MUST_SUCCEED);
1064
1065                 if(xt_t->print != NULL)
1066                         xt_t->print(NULL, target, 1);
1067         } else {
1068                 xt_t = xtables_find_target(target->u.user.name, XTF_TRY_LOAD);
1069                 if (xt_t == NULL) {
1070                         connman_info("\ttarget %s", target->u.user.name);
1071                         return;
1072                 }
1073
1074                 if(xt_t->print != NULL) {
1075                         connman_info("\ttarget ");
1076                         xt_t->print(NULL, target, 1);
1077                 }
1078         }
1079 }
1080
1081 static void dump_match(struct connman_iptables *table, struct ipt_entry *entry)
1082 {
1083         struct xtables_match *xt_m;
1084         struct xt_entry_match *match;
1085
1086         if (entry->elems == (unsigned char *)entry + entry->target_offset)
1087                 return;
1088
1089         match = (struct xt_entry_match *) entry->elems;
1090
1091         if (!strlen(match->u.user.name))
1092                 return;
1093
1094         xt_m = xtables_find_match(match->u.user.name, XTF_TRY_LOAD, NULL);
1095         if (xt_m == NULL)
1096                 goto out;
1097
1098         if(xt_m->print != NULL) {
1099                 connman_info("\tmatch ");
1100                 xt_m->print(NULL, match, 1);
1101
1102                 return;
1103         }
1104
1105 out:
1106         connman_info("\tmatch %s", match->u.user.name);
1107
1108 }
1109
1110 static int dump_entry(struct ipt_entry *entry,
1111                                 struct connman_iptables *table)
1112 {
1113         struct xt_entry_target *target;
1114         unsigned int offset;
1115         int builtin;
1116
1117         offset = (char *)entry - (char *)table->blob_entries->entrytable;
1118         target = ipt_get_target(entry);
1119         builtin = is_hook_entry(table, entry);
1120
1121         if (entry_to_offset(table, entry) + entry->next_offset ==
1122                                         table->blob_entries->size) {
1123                 connman_info("End of CHAIN 0x%x", offset);
1124                 return 0;
1125         }
1126
1127         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET)) {
1128                 connman_info("USER CHAIN (%s) %p  match %p  target %p  size %d",
1129                         target->data, entry, entry->elems,
1130                         (char *)entry + entry->target_offset,
1131                                 entry->next_offset);
1132
1133                 return 0;
1134         } else if (builtin >= 0) {
1135                 connman_info("CHAIN (%s) %p  match %p  target %p  size %d",
1136                         hooknames[builtin], entry, entry->elems,
1137                         (char *)entry + entry->target_offset,
1138                                 entry->next_offset);
1139         } else {
1140                 connman_info("RULE %p  match %p  target %p  size %d", entry,
1141                         entry->elems,
1142                         (char *)entry + entry->target_offset,
1143                                 entry->next_offset);
1144         }
1145
1146         dump_match(table, entry);
1147         dump_target(table, entry);
1148         dump_ip(entry);
1149
1150         return 0;
1151 }
1152
1153 static void iptables_dump(struct connman_iptables *table)
1154 {
1155         connman_info("%s valid_hooks=0x%08x, num_entries=%u, size=%u",
1156                         table->info->name,
1157                         table->info->valid_hooks, table->info->num_entries,
1158                                 table->info->size);
1159
1160         ENTRY_ITERATE(table->blob_entries->entrytable,
1161                         table->blob_entries->size,
1162                         dump_entry, table);
1163
1164 }
1165
1166 static int iptables_get_entries(struct connman_iptables *table)
1167 {
1168         socklen_t entry_size;
1169
1170         entry_size = sizeof(struct ipt_get_entries) + table->info->size;
1171
1172         return getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_ENTRIES,
1173                                 table->blob_entries, &entry_size);
1174 }
1175
1176 static int iptables_replace(struct connman_iptables *table,
1177                                         struct ipt_replace *r)
1178 {
1179         return setsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_SET_REPLACE, r,
1180                          sizeof(*r) + r->size);
1181 }
1182
1183 static int add_entry(struct ipt_entry *entry, struct connman_iptables *table)
1184 {
1185         struct ipt_entry *new_entry;
1186         int builtin;
1187
1188         new_entry = g_try_malloc0(entry->next_offset);
1189         if (new_entry == NULL)
1190                 return -ENOMEM;
1191
1192         memcpy(new_entry, entry, entry->next_offset);
1193
1194         builtin = is_hook_entry(table, entry);
1195
1196         return iptables_add_entry(table, new_entry, NULL, builtin);
1197 }
1198
1199 static void table_cleanup(struct connman_iptables *table)
1200 {
1201         GList *list;
1202         struct connman_iptables_entry *entry;
1203
1204         if (table == NULL)
1205                 return;
1206
1207         close(table->ipt_sock);
1208
1209         for (list = table->entries; list; list = list->next) {
1210                 entry = list->data;
1211
1212                 g_free(entry->entry);
1213                 g_free(entry);
1214         }
1215
1216         g_list_free(table->entries);
1217         g_free(table->info);
1218         g_free(table->blob_entries);
1219         g_free(table);
1220 }
1221
1222 static struct connman_iptables *iptables_init(char *table_name)
1223 {
1224         struct connman_iptables *table = NULL;
1225         char *module = NULL;
1226         socklen_t s;
1227
1228         DBG("%s", table_name);
1229
1230         if (xtables_insmod("ip_tables", NULL, TRUE) != 0)
1231                 return NULL;
1232
1233         module = g_strconcat("iptable_", table_name, NULL);
1234         if (module == NULL)
1235                 return NULL;
1236
1237         if (xtables_insmod(module, NULL, TRUE) != 0) {
1238                 g_free(module);
1239                 return NULL;
1240         }
1241
1242         g_free(module);
1243
1244         table = g_hash_table_lookup(table_hash, table_name);
1245         if (table != NULL)
1246                 return table;
1247
1248         table = g_try_new0(struct connman_iptables, 1);
1249         if (table == NULL)
1250                 return NULL;
1251
1252         table->info = g_try_new0(struct ipt_getinfo, 1);
1253         if (table->info == NULL)
1254                 goto err;
1255
1256         table->ipt_sock = socket(AF_INET, SOCK_RAW | SOCK_CLOEXEC, IPPROTO_RAW);
1257         if (table->ipt_sock < 0)
1258                 goto err;
1259
1260         s = sizeof(*table->info);
1261         strcpy(table->info->name, table_name);
1262         if (getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_INFO,
1263                                                 table->info, &s) < 0)
1264                 goto err;
1265
1266         table->blob_entries = g_try_malloc0(sizeof(struct ipt_get_entries) +
1267                                                 table->info->size);
1268         if (table->blob_entries == NULL)
1269                 goto err;
1270
1271         strcpy(table->blob_entries->name, table_name);
1272         table->blob_entries->size = table->info->size;
1273
1274         if (iptables_get_entries(table) < 0)
1275                 goto err;
1276
1277         table->num_entries = 0;
1278         table->old_entries = table->info->num_entries;
1279         table->size = 0;
1280
1281         memcpy(table->underflow, table->info->underflow,
1282                                 sizeof(table->info->underflow));
1283         memcpy(table->hook_entry, table->info->hook_entry,
1284                                 sizeof(table->info->hook_entry));
1285
1286         ENTRY_ITERATE(table->blob_entries->entrytable,
1287                         table->blob_entries->size,
1288                                 add_entry, table);
1289
1290         g_hash_table_insert(table_hash, g_strdup(table_name), table);
1291
1292         return table;
1293
1294 err:
1295         table_cleanup(table);
1296
1297         return NULL;
1298 }
1299
1300 static struct option iptables_opts[] = {
1301         {.name = "append",        .has_arg = 1, .val = 'A'},
1302         {.name = "compare",       .has_arg = 1, .val = 'C'},
1303         {.name = "delete",        .has_arg = 1, .val = 'D'},
1304         {.name = "flush-chain",   .has_arg = 1, .val = 'F'},
1305         {.name = "insert",        .has_arg = 1, .val = 'I'},
1306         {.name = "list",          .has_arg = 2, .val = 'L'},
1307         {.name = "new-chain",     .has_arg = 1, .val = 'N'},
1308         {.name = "policy",        .has_arg = 1, .val = 'P'},
1309         {.name = "delete-chain",  .has_arg = 1, .val = 'X'},
1310         {.name = "destination",   .has_arg = 1, .val = 'd'},
1311         {.name = "in-interface",  .has_arg = 1, .val = 'i'},
1312         {.name = "jump",          .has_arg = 1, .val = 'j'},
1313         {.name = "match",         .has_arg = 1, .val = 'm'},
1314         {.name = "out-interface", .has_arg = 1, .val = 'o'},
1315         {.name = "source",        .has_arg = 1, .val = 's'},
1316         {.name = "table",         .has_arg = 1, .val = 't'},
1317         {NULL},
1318 };
1319
1320 struct xtables_globals iptables_globals = {
1321         .option_offset = 0,
1322         .opts = iptables_opts,
1323         .orig_opts = iptables_opts,
1324 };
1325
1326 static struct xtables_target *prepare_target(struct connman_iptables *table,
1327                                                         char *target_name)
1328 {
1329         struct xtables_target *xt_t = NULL;
1330         gboolean is_builtin, is_user_defined;
1331         GList *chain_head = NULL;
1332         size_t target_size;
1333
1334         is_builtin = FALSE;
1335         is_user_defined = FALSE;
1336
1337         if (is_builtin_target(target_name))
1338                 is_builtin = TRUE;
1339         else {
1340                 chain_head = find_chain_head(table, target_name);
1341                 if (chain_head != NULL && chain_head->next != NULL)
1342                         is_user_defined = TRUE;
1343         }
1344
1345         if (is_builtin || is_user_defined)
1346                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
1347                                                 XTF_LOAD_MUST_SUCCEED);
1348         else
1349                 xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
1350
1351         if (xt_t == NULL)
1352                 return NULL;
1353
1354         target_size = ALIGN(sizeof(struct ipt_entry_target)) + xt_t->size;
1355
1356         xt_t->t = g_try_malloc0(target_size);
1357         if (xt_t->t == NULL)
1358                 return NULL;
1359
1360         xt_t->t->u.target_size = target_size;
1361
1362         if (is_builtin || is_user_defined) {
1363                 struct xt_standard_target *target;
1364
1365                 target = (struct xt_standard_target *)(xt_t->t);
1366                 strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
1367
1368                 if (is_builtin == TRUE)
1369                         target->verdict = target_to_verdict(target_name);
1370                 else if (is_user_defined == TRUE) {
1371                         struct connman_iptables_entry *target_rule;
1372
1373                         if (chain_head == NULL) {
1374                                 g_free(xt_t->t);
1375                                 return NULL;
1376                         }
1377
1378                         target_rule = chain_head->next->data;
1379                         target->verdict = target_rule->offset;
1380                 }
1381         } else {
1382                 strcpy(xt_t->t->u.user.name, target_name);
1383                 xt_t->t->u.user.revision = xt_t->revision;
1384                 if (xt_t->init != NULL)
1385                         xt_t->init(xt_t->t);
1386         }
1387
1388 #if XTABLES_VERSION_CODE > 5
1389         if (xt_t->x6_options != NULL)
1390                 iptables_globals.opts =
1391                         xtables_options_xfrm(
1392                                 iptables_globals.orig_opts,
1393                                 iptables_globals.opts,
1394                                 xt_t->x6_options,
1395                                 &xt_t->option_offset);
1396         else
1397 #endif
1398                 iptables_globals.opts =
1399                         xtables_merge_options(
1400 #if XTABLES_VERSION_CODE > 5
1401                                 iptables_globals.orig_opts,
1402 #endif
1403                                 iptables_globals.opts,
1404                                 xt_t->extra_opts,
1405                                 &xt_t->option_offset);
1406
1407         if (iptables_globals.opts == NULL) {
1408                 g_free(xt_t->t);
1409                 xt_t = NULL;
1410         }
1411
1412         return xt_t;
1413 }
1414
1415 static struct xtables_match *prepare_matches(struct connman_iptables *table,
1416                         struct xtables_rule_match **xt_rm, char *match_name)
1417 {
1418         struct xtables_match *xt_m;
1419         size_t match_size;
1420
1421         if (match_name == NULL)
1422                 return NULL;
1423
1424         xt_m = xtables_find_match(match_name, XTF_LOAD_MUST_SUCCEED, xt_rm);
1425         match_size = ALIGN(sizeof(struct ipt_entry_match)) + xt_m->size;
1426
1427         xt_m->m = g_try_malloc0(match_size);
1428         if (xt_m->m == NULL)
1429                 return NULL;
1430
1431         xt_m->m->u.match_size = match_size;
1432         strcpy(xt_m->m->u.user.name, xt_m->name);
1433         xt_m->m->u.user.revision = xt_m->revision;
1434
1435         if (xt_m->init != NULL)
1436                 xt_m->init(xt_m->m);
1437
1438         if (xt_m == xt_m->next)
1439                 goto done;
1440
1441 #if XTABLES_VERSION_CODE > 5
1442         if (xt_m->x6_options != NULL)
1443                 iptables_globals.opts =
1444                         xtables_options_xfrm(
1445                                 iptables_globals.orig_opts,
1446                                 iptables_globals.opts,
1447                                 xt_m->x6_options,
1448                                 &xt_m->option_offset);
1449         else
1450 #endif
1451                         iptables_globals.opts =
1452                         xtables_merge_options(
1453 #if XTABLES_VERSION_CODE > 5
1454                                 iptables_globals.orig_opts,
1455 #endif
1456                                 iptables_globals.opts,
1457                                 xt_m->extra_opts,
1458                                 &xt_m->option_offset);
1459
1460         if (iptables_globals.opts == NULL) {
1461                 g_free(xt_m->m);
1462                 xt_m = NULL;
1463         }
1464
1465 done:
1466         return xt_m;
1467 }
1468
1469 static int iptables_command(int argc, char *argv[])
1470 {
1471         struct connman_iptables *table;
1472         struct xtables_rule_match *xt_rm, *tmp_xt_rm;
1473         struct xtables_match *xt_m, *xt_m_t;
1474         struct xtables_target *xt_t;
1475         struct ipt_ip ip;
1476         char *table_name, *chain, *new_chain, *match_name, *target_name;
1477         char *flush_chain, *delete_chain, *policy;
1478         int c, ret, in_len, out_len;
1479         gboolean dump, invert, insert, delete, compare;
1480         struct in_addr src, dst;
1481
1482         if (argc == 0)
1483                 return -EINVAL;
1484
1485         dump = FALSE;
1486         invert = FALSE;
1487         insert = FALSE;
1488         delete = FALSE;
1489         compare = FALSE;
1490         table_name = chain = new_chain = match_name = target_name = NULL;
1491         flush_chain = delete_chain = policy = NULL;
1492         memset(&ip, 0, sizeof(struct ipt_ip));
1493         table = NULL;
1494         xt_rm = NULL;
1495         xt_m = NULL;
1496         xt_t = NULL;
1497         ret = 0;
1498
1499         /* extension's options will generate false-positives errors */
1500         opterr = 0;
1501
1502         optind = 0;
1503
1504         while ((c = getopt_long(argc, argv,
1505                                         "-A:C:D:F:I:L::N:P:X:d:j:i:m:o:s:t:",
1506                                         iptables_globals.opts, NULL)) != -1) {
1507                 switch (c) {
1508                 case 'A':
1509                         /* It is either -A, -C, -D or -I at once */
1510                         if (chain)
1511                                 goto out;
1512
1513                         chain = optarg;
1514                         break;
1515
1516                 case 'C':
1517                         /* It is either -A, -C, -D or -I at once */
1518                         if (chain)
1519                                 goto out;
1520
1521                         chain = optarg;
1522                         compare = TRUE;
1523                         break;
1524
1525                 case 'D':
1526                         /* It is either -A, -C, -D or -I at once */
1527                         if (chain)
1528                                 goto out;
1529
1530                         chain = optarg;
1531                         delete = TRUE;
1532                         break;
1533
1534                 case 'F':
1535                         flush_chain = optarg;
1536                         break;
1537
1538                 case 'I':
1539                         /* It is either -A, -C, -D or -I at once */
1540                         if (chain)
1541                                 goto out;
1542
1543                         chain = optarg;
1544                         insert = TRUE;
1545                         break;
1546
1547                 case 'L':
1548                         dump = TRUE;
1549                         break;
1550
1551                 case 'N':
1552                         new_chain = optarg;
1553                         break;
1554
1555                 case 'P':
1556                         chain = optarg;
1557                         if (optind < argc)
1558                                 policy = argv[optind++];
1559                         else
1560                                 goto out;
1561
1562                         break;
1563
1564                 case 'X':
1565                         delete_chain = optarg;
1566                         break;
1567
1568                 case 'd':
1569                         if (!inet_pton(AF_INET, optarg, &dst))
1570                                 break;
1571
1572                         ip.dst = dst;
1573                         inet_pton(AF_INET, "255.255.255.255", &ip.dmsk);
1574
1575                         if (invert)
1576                                 ip.invflags |= IPT_INV_DSTIP;
1577
1578                         break;
1579
1580                 case 'i':
1581                         in_len = strlen(optarg);
1582
1583                         if (in_len + 1 > IFNAMSIZ)
1584                                 break;
1585
1586                         strcpy(ip.iniface, optarg);
1587                         memset(ip.iniface_mask, 0xff, in_len + 1);
1588
1589                         if (invert)
1590                                 ip.invflags |= IPT_INV_VIA_IN;
1591
1592                         break;
1593
1594                 case 'j':
1595                         target_name = optarg;
1596                         xt_t = prepare_target(table, target_name);
1597                         if (xt_t == NULL)
1598                                 goto out;
1599
1600                         break;
1601
1602                 case 'm':
1603                         match_name = optarg;
1604                         xt_m = prepare_matches(table, &xt_rm, match_name);
1605                         if (xt_m == NULL)
1606                                 goto out;
1607
1608                         break;
1609
1610                 case 'o':
1611                         out_len = strlen(optarg);
1612
1613                         if (out_len + 1 > IFNAMSIZ)
1614                                 break;
1615
1616                         strcpy(ip.outiface, optarg);
1617                         memset(ip.outiface_mask, 0xff, out_len + 1);
1618
1619                         if (invert)
1620                                 ip.invflags |= IPT_INV_VIA_OUT;
1621
1622                         break;
1623
1624                 case 's':
1625                         if (!inet_pton(AF_INET, optarg, &src))
1626                                 break;
1627
1628                         ip.src = src;
1629                         inet_pton(AF_INET, "255.255.255.255", &ip.smsk);
1630
1631                         if (invert)
1632                                 ip.invflags |= IPT_INV_SRCIP;
1633
1634                         break;
1635
1636                 case 't':
1637                         table_name = optarg;
1638
1639                         table = iptables_init(table_name);
1640                         if (table == NULL) {
1641                                 ret = -EINVAL;
1642                                 goto out;
1643                         }
1644
1645                         break;
1646
1647                 case 1:
1648                         if (optarg[0] == '!' && optarg[1] == '\0') {
1649                                 invert = TRUE;
1650                                 optarg[0] = '\0';
1651                                 continue;
1652                         }
1653
1654                         connman_error("Invalid option");
1655
1656                         ret = -EINVAL;
1657                         goto out;
1658
1659                 default:
1660 #if XTABLES_VERSION_CODE > 5
1661                         if (xt_t != NULL && (xt_t->x6_parse != NULL ||
1662                                                 xt_t->parse != NULL) &&
1663                                         (c >= (int) xt_t->option_offset &&
1664                                         c < (int) xt_t->option_offset +
1665                                         XT_OPTION_OFFSET_SCALE)) {
1666                                 xtables_option_tpcall(c, argv,
1667                                                         invert, xt_t, NULL);
1668
1669                                 break;
1670                         }
1671
1672                         for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL;
1673                                                 tmp_xt_rm = tmp_xt_rm->next) {
1674                                 xt_m_t = tmp_xt_rm->match;
1675
1676                                 if (tmp_xt_rm->completed ||
1677                                                 (xt_m_t->x6_parse == NULL &&
1678                                                  xt_m_t->parse == NULL))
1679                                         continue;
1680
1681                                 if (c < (int) xt_m_t->option_offset ||
1682                                         c >= (int) xt_m_t->option_offset
1683                                         + XT_OPTION_OFFSET_SCALE)
1684                                         continue;
1685
1686                                 xtables_option_mpcall(c, argv,
1687                                                         invert, xt_m_t, NULL);
1688
1689                                 break;
1690                         }
1691 #else
1692                         if (xt_t == NULL || xt_t->parse == NULL ||
1693                                 !xt_t->parse(c - xt_t->option_offset,
1694                                 argv, invert, &xt_t->tflags, NULL, &xt_t->t)) {
1695
1696                                 for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL;
1697                                                 tmp_xt_rm = tmp_xt_rm->next) {
1698                                         xt_m_t = tmp_xt_rm->match;
1699
1700                                         if (tmp_xt_rm->completed ||
1701                                                         xt_m_t->parse == NULL)
1702                                                 continue;
1703
1704                                         if (xt_m->parse(c - xt_m->option_offset,
1705                                                 argv, invert, &xt_m->mflags,
1706                                                 NULL, &xt_m->m))
1707                                                 break;
1708                                 }
1709                         }
1710 #endif
1711                         break;
1712                 }
1713
1714                 invert = FALSE;
1715         }
1716
1717 #if XTABLES_VERSION_CODE > 5
1718         for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL;
1719                                 tmp_xt_rm = tmp_xt_rm->next)
1720                 xtables_option_mfcall(tmp_xt_rm->match);
1721
1722         if (xt_t != NULL)
1723                 xtables_option_tfcall(xt_t);
1724 #else
1725         for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL;
1726                                 tmp_xt_rm = tmp_xt_rm->next)
1727                 if (tmp_xt_rm->match->final_check != NULL)
1728                         tmp_xt_rm->match->final_check(
1729                                         tmp_xt_rm->match->mflags);
1730
1731         if (xt_t != NULL && xt_t->final_check != NULL)
1732                 xt_t->final_check(xt_t->tflags);
1733 #endif
1734
1735         if (table == NULL) {
1736                 table_name = "filter";
1737
1738                 table = iptables_init(table_name);
1739                 if (table == NULL) {
1740                         ret = -EINVAL;
1741                         goto out;
1742                 }
1743         }
1744
1745         if (delete_chain != NULL) {
1746                 printf("Delete chain %s\n", delete_chain);
1747
1748                 iptables_delete_chain(table, delete_chain);
1749
1750                 goto out;
1751         }
1752
1753         if (dump) {
1754                 iptables_dump(table);
1755
1756                 ret = 0;
1757                 goto out;
1758         }
1759
1760         if (flush_chain) {
1761                 DBG("Flush chain %s", flush_chain);
1762
1763                 iptables_flush_chain(table, flush_chain);
1764
1765                 goto out;
1766         }
1767
1768         if (chain && new_chain) {
1769                 ret = -EINVAL;
1770                 goto out;
1771         }
1772
1773         if (new_chain) {
1774                 DBG("New chain %s", new_chain);
1775
1776                 ret = iptables_add_chain(table, new_chain);
1777                 goto out;
1778         }
1779
1780         if (chain) {
1781                 if (policy != NULL) {
1782                         printf("Changing policy of %s to %s\n", chain, policy);
1783
1784                         iptables_change_policy(table, chain, policy);
1785
1786                         goto out;
1787                 }
1788
1789                 if (xt_t == NULL)
1790                         goto out;
1791
1792                 if (compare == TRUE) {
1793                         ret = iptables_compare_rule(table, &ip, chain,
1794                                         target_name, xt_t, xt_m, xt_rm);
1795                         goto out;
1796                 }
1797
1798                 if (delete == TRUE) {
1799                         DBG("Deleting %s to %s (match %s)\n",
1800                                         target_name, chain, match_name);
1801
1802                         ret = iptables_delete_rule(table, &ip, chain,
1803                                         target_name, xt_t, xt_m, xt_rm);
1804
1805                         goto out;
1806                 }
1807
1808                 if (insert == TRUE) {
1809                         DBG("Inserting %s to %s (match %s)",
1810                                         target_name, chain, match_name);
1811
1812                         ret = iptables_insert_rule(table, &ip, chain,
1813                                                 target_name, xt_t, xt_rm);
1814
1815                         goto out;
1816                 } else {
1817                         DBG("Adding %s to %s (match %s)",
1818                                         target_name, chain, match_name);
1819
1820                         ret = iptables_append_rule(table, &ip, chain,
1821                                                 target_name, xt_t, xt_rm);
1822
1823                         goto out;
1824                 }
1825         }
1826
1827 out:
1828         if (xt_t)
1829                 g_free(xt_t->t);
1830
1831         if (xt_m)
1832                 g_free(xt_m->m);
1833
1834         return ret;
1835 }
1836
1837 int __connman_iptables_command(const char *format, ...)
1838 {
1839         char **argv, **arguments, *command;
1840         int argc, i, ret;
1841         va_list args;
1842
1843         if (format == NULL)
1844                 return -EINVAL;
1845
1846         va_start(args, format);
1847
1848         command = g_strdup_vprintf(format, args);
1849
1850         va_end(args);
1851
1852         if (command == NULL)
1853                 return -ENOMEM;
1854
1855         arguments = g_strsplit_set(command, " ", -1);
1856
1857         for (argc = 0; arguments[argc]; argc++);
1858         ++argc;
1859
1860         DBG("command %s argc %d", command, argc);
1861
1862         argv = g_try_malloc0(argc * sizeof(char *));
1863         if (argv == NULL) {
1864                 g_free(command);
1865                 g_strfreev(arguments);
1866                 return -ENOMEM;
1867         }
1868
1869         argv[0] = "iptables";
1870         for (i = 1; i < argc; i++)
1871                 argv[i] = arguments[i - 1];
1872
1873         ret = iptables_command(argc, argv);
1874
1875         g_free(command);
1876         g_strfreev(arguments);
1877         g_free(argv);
1878
1879         return ret;
1880 }
1881
1882
1883 int __connman_iptables_commit(const char *table_name)
1884 {
1885         struct connman_iptables *table;
1886         struct ipt_replace *repl;
1887         int err;
1888
1889         DBG("%s", table_name);
1890
1891         table = g_hash_table_lookup(table_hash, table_name);
1892         if (table == NULL)
1893                 return -EINVAL;
1894
1895         repl = iptables_blob(table);
1896
1897         err = iptables_replace(table, repl);
1898
1899         g_free(repl->counters);
1900         g_free(repl);
1901
1902         if (err < 0)
1903             return err;
1904
1905         g_hash_table_remove(table_hash, table_name);
1906
1907         return 0;
1908 }
1909
1910 static void remove_table(gpointer user_data)
1911 {
1912         struct connman_iptables *table = user_data;
1913
1914         table_cleanup(table);
1915 }
1916
1917 int __connman_iptables_init(void)
1918 {
1919         DBG("");
1920
1921         table_hash = g_hash_table_new_full(g_str_hash, g_str_equal,
1922                                                 g_free, remove_table);
1923
1924         xtables_init_all(&iptables_globals, NFPROTO_IPV4);
1925
1926         return 0;
1927
1928 }
1929
1930 void __connman_iptables_cleanup(void)
1931 {
1932         DBG("");
1933
1934         g_hash_table_destroy(table_hash);
1935
1936         xtables_free_opts(1);
1937 }