src/iptables.c

   1 /*
   2  *
   3  *  Connection Manager
   4  *
   5  *  Copyright (C) 2007-2010  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 /* fn returns 0 to continue iteration */
  54 #define _XT_ENTRY_ITERATE_CONTINUE(type, entries, size, n, fn, args...) \
  55 ({                                                              \
  56         unsigned int __i;                                       \
  57         int __n;                                                \
  58         int __ret = 0;                                          \
  59         type *__entry;                                          \
  60                                                                 \
  61         for (__i = 0, __n = 0; __i < (size);                    \
  62              __i += __entry->next_offset, __n++) {              \
  63                 __entry = (void *)(entries) + __i;              \
  64                 if (__n < n)                                    \
  65                         continue;                               \
  66                                                                 \
  67                 __ret = fn(__entry,  ## args);                  \
  68                 if (__ret != 0)                                 \
  69                         break;                                  \
  70         }                                                       \
  71         __ret;                                                  \
  72 })
  73
  74 /* fn returns 0 to continue iteration */
  75 #define _XT_ENTRY_ITERATE(type, entries, size, fn, args...) \
  76         _XT_ENTRY_ITERATE_CONTINUE(type, entries, size, 0, fn, args)
  77
  78 #define ENTRY_ITERATE(entries, size, fn, args...) \
  79         _XT_ENTRY_ITERATE(struct ipt_entry, entries, size, fn, ## args)
  80
  81 #define MIN_ALIGN (__alignof__(struct ipt_entry))
  82
  83 #define ALIGN(s) (((s) + ((MIN_ALIGN)-1)) & ~((MIN_ALIGN)-1))
  84
  85 struct error_target {
  86         struct xt_entry_target t;
  87         char error[IPT_TABLE_MAXNAMELEN];
  88 };
  89
  90 struct connman_iptables_entry {
  91         int offset;
  92         int builtin;
  93
  94         struct ipt_entry *entry;
  95 };
  96
  97 struct connman_iptables {
  98         int ipt_sock;
  99
 100         struct ipt_getinfo *info;
 101         struct ipt_get_entries *blob_entries;
 102
 103         unsigned int num_entries;
 104         unsigned int old_entries;
 105         unsigned int size;
 106
 107         unsigned int underflow[NF_INET_NUMHOOKS];
 108         unsigned int hook_entry[NF_INET_NUMHOOKS];
 109
 110         GList *entries;
 111 };
 112
 113 static GHashTable *table_hash = NULL;
 114
 115 static struct ipt_entry *get_entry(struct connman_iptables *table,
 116                                         unsigned int offset)
 117 {
 118         return (struct ipt_entry *)((char *)table->blob_entries->entrytable +
 119                                                                         offset);
 120 }
 121
 122 static int is_hook_entry(struct connman_iptables *table,
 123                                 struct ipt_entry *entry)
 124 {
 125         unsigned int i;
 126
 127         for (i = 0; i < NF_INET_NUMHOOKS; i++) {
 128                 if ((table->info->valid_hooks & (1 << i))
 129                 && get_entry(table, table->info->hook_entry[i]) == entry)
 130                         return i;
 131         }
 132
 133         return -1;
 134 }
 135
 136 static unsigned long entry_to_offset(struct connman_iptables *table,
 137                                         struct ipt_entry *entry)
 138 {
 139         return (void *)entry - (void *)table->blob_entries->entrytable;
 140 }
 141
 142 static int target_to_verdict(char *target_name)
 143 {
 144         if (!strcmp(target_name, LABEL_ACCEPT))
 145                 return -NF_ACCEPT - 1;
 146
 147         if (!strcmp(target_name, LABEL_DROP))
 148                 return -NF_DROP - 1;
 149
 150         if (!strcmp(target_name, LABEL_QUEUE))
 151                 return -NF_QUEUE - 1;
 152
 153         if (!strcmp(target_name, LABEL_RETURN))
 154                 return XT_RETURN;
 155
 156         return 0;
 157 }
 158
 159 static gboolean is_builtin_target(char *target_name)
 160 {
 161         if (!strcmp(target_name, LABEL_ACCEPT) ||
 162                 !strcmp(target_name, LABEL_DROP) ||
 163                 !strcmp(target_name, LABEL_QUEUE) ||
 164                 !strcmp(target_name, LABEL_RETURN))
 165                 return TRUE;
 166
 167         return FALSE;
 168 }
 169
 170 static gboolean is_jump(struct connman_iptables_entry *e)
 171 {
 172         struct xt_entry_target *target;
 173
 174         target = ipt_get_target(e->entry);
 175
 176         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
 177                 struct xt_standard_target *t;
 178
 179                 t = (struct xt_standard_target *)target;
 180
 181                 switch (t->verdict) {
 182                 case XT_RETURN:
 183                 case -NF_ACCEPT - 1:
 184                 case -NF_DROP - 1:
 185                 case -NF_QUEUE - 1:
 186                 case -NF_STOP - 1:
 187                         return false;
 188
 189                 default:
 190                         return true;
 191                 }
 192         }
 193
 194         return false;
 195 }
 196
 197 static gboolean is_chain(struct connman_iptables *table,
 198                                 struct connman_iptables_entry *e)
 199 {
 200         struct ipt_entry *entry;
 201         struct xt_entry_target *target;
 202
 203         entry = e->entry;
 204         if (e->builtin >= 0)
 205                 return TRUE;
 206
 207         target = ipt_get_target(entry);
 208         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET))
 209                 return TRUE;
 210
 211         return FALSE;
 212 }
 213
 214 static GList *find_chain_head(struct connman_iptables *table,
 215                                 char *chain_name)
 216 {
 217         GList *list;
 218         struct connman_iptables_entry *head;
 219         struct ipt_entry *entry;
 220         struct xt_entry_target *target;
 221         int builtin;
 222
 223         for (list = table->entries; list; list = list->next) {
 224                 head = list->data;
 225                 entry = head->entry;
 226
 227                 /* Buit-in chain */
 228                 builtin = head->builtin;
 229                 if (builtin >= 0 && !strcmp(hooknames[builtin], chain_name))
 230                         break;
 231
 232                 /* User defined chain */
 233                 target = ipt_get_target(entry);
 234                 if (!strcmp(target->u.user.name, IPT_ERROR_TARGET) &&
 235                     !strcmp((char *)target->data, chain_name))
 236                         break;
 237         }
 238
 239         return list;
 240 }
 241
 242 static GList *find_chain_tail(struct connman_iptables *table,
 243                                 char *chain_name)
 244 {
 245         struct connman_iptables_entry *tail;
 246         GList *chain_head, *list;
 247
 248         chain_head = find_chain_head(table, chain_name);
 249         if (chain_head == NULL)
 250                 return NULL;
 251
 252         /* Then we look for the next chain */
 253         for (list = chain_head->next; list; list = list->next) {
 254                 tail = list->data;
 255
 256                 if (is_chain(table, tail))
 257                         return list;
 258         }
 259
 260         /* Nothing found, we return the table end */
 261         return g_list_last(table->entries);
 262 }
 263
 264
 265 static void update_offsets(struct connman_iptables *table)
 266 {
 267         GList *list, *prev;
 268         struct connman_iptables_entry *entry, *prev_entry;
 269
 270         for (list = table->entries; list; list = list->next) {
 271                 entry = list->data;
 272
 273                 if (list == table->entries) {
 274                         entry->offset = 0;
 275
 276                         continue;
 277                 }
 278
 279                 prev = list->prev;
 280                 prev_entry = prev->data;
 281
 282                 entry->offset = prev_entry->offset +
 283                                         prev_entry->entry->next_offset;
 284         }
 285 }
 286
 287 static int iptables_add_entry(struct connman_iptables *table,
 288                                 struct ipt_entry *entry, GList *before,
 289                                         int builtin)
 290 {
 291         GList *list;
 292         struct connman_iptables_entry *e, *tmp, *entry_before;
 293         struct xt_standard_target *t;
 294
 295         if (table == NULL)
 296                 return -1;
 297
 298         e = g_try_malloc0(sizeof(struct connman_iptables_entry));
 299         if (e == NULL)
 300                 return -1;
 301
 302         e->entry = entry;
 303         e->builtin = builtin;
 304
 305         table->entries = g_list_insert_before(table->entries, before, e);
 306         table->num_entries++;
 307         table->size += entry->next_offset;
 308
 309         if (before == NULL) {
 310                 e->offset = table->size - entry->next_offset;
 311
 312                 return 0;
 313         }
 314
 315         entry_before = before->data;
 316
 317         /*
 318          * We've just appended/insterted a new entry. All references
 319          * should be bumped accordingly.
 320          */
 321         for (list = table->entries; list; list = list->next) {
 322                 tmp = list->data;
 323
 324                 if (!is_jump(tmp))
 325                         continue;
 326
 327                 t = (struct xt_standard_target *)ipt_get_target(tmp->entry);
 328
 329                 if (t->verdict > entry_before->offset)
 330                         t->verdict += entry->next_offset;
 331         }
 332
 333         update_offsets(table);
 334
 335         return 0;
 336 }
 337
 338 static int remove_table_entry(struct connman_iptables *table,
 339                                 struct connman_iptables_entry *entry)
 340 {
 341         int removed = 0;
 342
 343         table->num_entries--;
 344         table->size -= entry->entry->next_offset;
 345         removed = entry->entry->next_offset;
 346
 347         g_free(entry->entry);
 348
 349         table->entries = g_list_remove(table->entries, entry);
 350
 351         return removed;
 352 }
 353
 354 static int iptables_flush_chain(struct connman_iptables *table,
 355                                                 char *name)
 356 {
 357         GList *chain_head, *chain_tail, *list, *next;
 358         struct connman_iptables_entry *entry;
 359         int builtin, removed = 0;
 360
 361         chain_head = find_chain_head(table, name);
 362         if (chain_head == NULL)
 363                 return -EINVAL;
 364
 365         chain_tail = find_chain_tail(table, name);
 366         if (chain_tail == NULL)
 367                 return -EINVAL;
 368
 369         entry = chain_head->data;
 370         builtin = entry->builtin;
 371
 372         if (builtin >= 0)
 373                 list = chain_head;
 374         else
 375                 list = chain_head->next;
 376
 377         if (list == chain_tail->prev)
 378                 return 0;
 379
 380         while (list != chain_tail->prev) {
 381                 entry = list->data;
 382                 next = g_list_next(list);
 383
 384                 removed += remove_table_entry(table, entry);
 385
 386                 list = next;
 387         }
 388
 389         if (builtin >= 0) {
 390                 struct connman_iptables_entry *e;
 391
 392                 entry = list->data;
 393
 394                 entry->builtin = builtin;
 395
 396                 table->underflow[builtin] -= removed;
 397
 398                 for (list = chain_tail; list; list = list->next) {
 399                         e = list->data;
 400
 401                         builtin = e->builtin;
 402                         if (builtin < 0)
 403                                 continue;
 404
 405                         table->hook_entry[builtin] -= removed;
 406                         table->underflow[builtin] -= removed;
 407                 }
 408         }
 409
 410         update_offsets(table);
 411
 412         return 0;
 413 }
 414
 415 static int iptables_add_chain(struct connman_iptables *table,
 416                                         char *name)
 417 {
 418         GList *last;
 419         struct ipt_entry *entry_head;
 420         struct ipt_entry *entry_return;
 421         struct error_target *error;
 422         struct ipt_standard_target *standard;
 423         u_int16_t entry_head_size, entry_return_size;
 424
 425         last = g_list_last(table->entries);
 426
 427         /*
 428          * An empty chain is composed of:
 429          * - A head entry, with no match and an error target.
 430          *   The error target data is the chain name.
 431          * - A tail entry, with no match and a standard target.
 432          *   The standard target verdict is XT_RETURN (return to the
 433          *   caller).
 434          */
 435
 436         /* head entry */
 437         entry_head_size = sizeof(struct ipt_entry) +
 438                                 sizeof(struct error_target);
 439         entry_head = g_try_malloc0(entry_head_size);
 440         if (entry_head == NULL)
 441                 goto err_head;
 442
 443         memset(entry_head, 0, entry_head_size);
 444
 445         entry_head->target_offset = sizeof(struct ipt_entry);
 446         entry_head->next_offset = entry_head_size;
 447
 448         error = (struct error_target *) entry_head->elems;
 449         strcpy(error->t.u.user.name, IPT_ERROR_TARGET);
 450         error->t.u.user.target_size = ALIGN(sizeof(struct error_target));
 451         strcpy(error->error, name);
 452
 453         if (iptables_add_entry(table, entry_head, last, -1) < 0)
 454                 goto err_head;
 455
 456         /* tail entry */
 457         entry_return_size = sizeof(struct ipt_entry) +
 458                                 sizeof(struct ipt_standard_target);
 459         entry_return = g_try_malloc0(entry_return_size);
 460         if (entry_return == NULL)
 461                 goto err;
 462
 463         memset(entry_return, 0, entry_return_size);
 464
 465         entry_return->target_offset = sizeof(struct ipt_entry);
 466         entry_return->next_offset = entry_return_size;
 467
 468         standard = (struct ipt_standard_target *) entry_return->elems;
 469         standard->target.u.user.target_size =
 470                                 ALIGN(sizeof(struct ipt_standard_target));
 471         standard->verdict = XT_RETURN;
 472
 473         if (iptables_add_entry(table, entry_return, last, -1) < 0)
 474                 goto err;
 475
 476         return 0;
 477
 478 err:
 479         g_free(entry_return);
 480 err_head:
 481         g_free(entry_head);
 482
 483         return -ENOMEM;
 484 }
 485
 486 static int iptables_delete_chain(struct connman_iptables *table, char *name)
 487 {
 488         struct connman_iptables_entry *entry;
 489         GList *chain_head, *chain_tail;
 490
 491         chain_head = find_chain_head(table, name);
 492         if (chain_head == NULL)
 493                 return -EINVAL;
 494
 495         entry = chain_head->data;
 496
 497         /* We cannot remove builtin chain */
 498         if (entry->builtin >= 0)
 499                 return -EINVAL;
 500
 501         chain_tail = find_chain_tail(table, name);
 502         if (chain_tail == NULL)
 503                 return -EINVAL;
 504
 505         /* Chain must be flushed */
 506         if (chain_head->next != chain_tail->prev)
 507                 return -EINVAL;
 508
 509         remove_table_entry(table, entry);
 510
 511         entry = chain_tail->prev->data;
 512         remove_table_entry(table, entry);
 513
 514         update_offsets(table);
 515
 516         return 0;
 517 }
 518
 519 static struct ipt_entry *
 520 new_rule(struct ipt_ip *ip, char *target_name,
 521                 struct xtables_target *xt_t,
 522                 char *match_name, struct xtables_match *xt_m)
 523 {
 524         struct ipt_entry *new_entry;
 525         size_t match_size, target_size;
 526
 527         if (xt_m)
 528                 match_size = xt_m->m->u.match_size;
 529         else
 530                 match_size = 0;
 531
 532         if (xt_t)
 533                 target_size = ALIGN(xt_t->t->u.target_size);
 534         else
 535                 target_size = ALIGN(sizeof(struct xt_standard_target));
 536
 537         new_entry = g_try_malloc0(sizeof(struct ipt_entry) + target_size +
 538                                                                 match_size);
 539         if (new_entry == NULL)
 540                 return NULL;
 541
 542         memcpy(&new_entry->ip, ip, sizeof(struct ipt_ip));
 543
 544         new_entry->target_offset = sizeof(struct ipt_entry) + match_size;
 545         new_entry->next_offset = sizeof(struct ipt_entry) + target_size +
 546                                                                 match_size;
 547         if (xt_m) {
 548                 struct xt_entry_match *entry_match;
 549
 550                 entry_match = (struct xt_entry_match *)new_entry->elems;
 551                 memcpy(entry_match, xt_m->m, match_size);
 552         }
 553
 554         if (xt_t) {
 555                 struct xt_entry_target *entry_target;
 556
 557                 entry_target = ipt_get_target(new_entry);
 558                 memcpy(entry_target, xt_t->t, target_size);
 559         }
 560
 561         return new_entry;
 562 }
 563
 564 static void update_hooks(struct connman_iptables *table, GList *chain_head,
 565                                 struct ipt_entry *entry)
 566 {
 567         GList *list;
 568         struct connman_iptables_entry *head, *e;
 569         int builtin;
 570
 571         if (chain_head == NULL)
 572                 return;
 573
 574         head = chain_head->data;
 575
 576         builtin = head->builtin;
 577         if (builtin < 0)
 578                 return;
 579
 580         table->underflow[builtin] += entry->next_offset;
 581
 582         for (list = chain_head->next; list; list = list->next) {
 583                 e = list->data;
 584
 585                 builtin = e->builtin;
 586                 if (builtin < 0)
 587                         continue;
 588
 589                 table->hook_entry[builtin] += entry->next_offset;
 590                 table->underflow[builtin] += entry->next_offset;
 591         }
 592 }
 593
 594 static struct ipt_entry *prepare_rule_inclusion(struct connman_iptables *table,
 595                                 struct ipt_ip *ip, char *chain_name,
 596                                 char *target_name, struct xtables_target *xt_t,
 597                                 char *match_name, struct xtables_match *xt_m,
 598                                 int *builtin)
 599 {
 600         GList *chain_tail, *chain_head;
 601         struct ipt_entry *new_entry;
 602         struct connman_iptables_entry *head;
 603
 604         chain_head = find_chain_head(table, chain_name);
 605         if (chain_head == NULL)
 606                 return NULL;
 607
 608         chain_tail = find_chain_tail(table, chain_name);
 609         if (chain_tail == NULL)
 610                 return NULL;
 611
 612         new_entry = new_rule(ip, target_name, xt_t, match_name, xt_m);
 613         if (new_entry == NULL)
 614                 return NULL;
 615
 616         update_hooks(table, chain_head, new_entry);
 617
 618         /*
 619          * If the chain is builtin, and does not have any rule,
 620          * then the one that we're inserting is becoming the head
 621          * and thus needs the builtin flag.
 622          */
 623         head = chain_head->data;
 624         if (head->builtin < 0)
 625                 *builtin = -1;
 626         else if (chain_head == chain_tail->prev) {
 627                 *builtin = head->builtin;
 628                 head->builtin = -1;
 629         }
 630
 631         return new_entry;
 632 }
 633
 634 static int iptables_append_rule(struct connman_iptables *table,
 635                                 struct ipt_ip *ip, char *chain_name,
 636                                 char *target_name, struct xtables_target *xt_t,
 637                                 char *match_name, struct xtables_match *xt_m)
 638 {
 639         GList *chain_tail;
 640         struct ipt_entry *new_entry;
 641         int builtin = -1, ret;
 642
 643         DBG("");
 644
 645         chain_tail = find_chain_tail(table, chain_name);
 646         if (chain_tail == NULL)
 647                 return -EINVAL;
 648
 649         new_entry = prepare_rule_inclusion(table, ip, chain_name,
 650                         target_name, xt_t, match_name, xt_m, &builtin);
 651         if (new_entry == NULL)
 652                 return -EINVAL;
 653
 654         ret = iptables_add_entry(table, new_entry, chain_tail->prev, builtin);
 655         if (ret < 0)
 656                 g_free(new_entry);
 657
 658         return ret;
 659 }
 660
 661 static int iptables_insert_rule(struct connman_iptables *table,
 662                                 struct ipt_ip *ip, char *chain_name,
 663                                 char *target_name, struct xtables_target *xt_t,
 664                                 char *match_name, struct xtables_match *xt_m)
 665 {
 666         struct ipt_entry *new_entry;
 667         int builtin = -1, ret;
 668         GList *chain_head;
 669
 670         chain_head = find_chain_head(table, chain_name);
 671         if (chain_head == NULL)
 672                 return -EINVAL;
 673
 674         new_entry = prepare_rule_inclusion(table, ip, chain_name,
 675                         target_name, xt_t, match_name, xt_m, &builtin);
 676         if (new_entry == NULL)
 677                 return -EINVAL;
 678
 679         ret = iptables_add_entry(table, new_entry, chain_head->next, builtin);
 680         if (ret < 0)
 681                 g_free(new_entry);
 682
 683         return ret;
 684 }
 685
 686 static struct ipt_replace *
 687 iptables_blob(struct connman_iptables *table)
 688 {
 689         struct ipt_replace *r;
 690         GList *list;
 691         struct connman_iptables_entry *e;
 692         unsigned char *entry_index;
 693
 694         r = g_try_malloc0(sizeof(struct ipt_replace) + table->size);
 695         if (r == NULL)
 696                 return NULL;
 697
 698         memset(r, 0, sizeof(*r) + table->size);
 699
 700         r->counters = g_try_malloc0(sizeof(struct xt_counters)
 701                                 * table->old_entries);
 702         if (r->counters == NULL) {
 703                 g_free(r);
 704                 return NULL;
 705         }
 706
 707         strcpy(r->name, table->info->name);
 708         r->num_entries = table->num_entries;
 709         r->size = table->size;
 710
 711         r->num_counters = table->old_entries;
 712         r->valid_hooks  = table->info->valid_hooks;
 713
 714         memcpy(r->hook_entry, table->hook_entry, sizeof(table->hook_entry));
 715         memcpy(r->underflow, table->underflow, sizeof(table->underflow));
 716
 717         entry_index = (unsigned char *)r->entries;
 718         for (list = table->entries; list; list = list->next) {
 719                 e = list->data;
 720
 721                 memcpy(entry_index, e->entry, e->entry->next_offset);
 722                 entry_index += e->entry->next_offset;
 723         }
 724
 725         return r;
 726 }
 727
 728 static void dump_ip(struct ipt_entry *entry)
 729 {
 730         struct ipt_ip *ip = &entry->ip;
 731         char ip_string[INET6_ADDRSTRLEN];
 732         char ip_mask[INET6_ADDRSTRLEN];
 733
 734         if (strlen(ip->iniface))
 735                 connman_info("\tin %s", ip->iniface);
 736
 737         if (strlen(ip->outiface))
 738                 connman_info("\tout %s", ip->outiface);
 739
 740         if (inet_ntop(AF_INET, &ip->src, ip_string, INET6_ADDRSTRLEN) != NULL &&
 741                         inet_ntop(AF_INET, &ip->smsk,
 742                                         ip_mask, INET6_ADDRSTRLEN) != NULL)
 743                 connman_info("\tsrc %s/%s", ip_string, ip_mask);
 744
 745         if (inet_ntop(AF_INET, &ip->dst, ip_string, INET6_ADDRSTRLEN) != NULL &&
 746                         inet_ntop(AF_INET, &ip->dmsk,
 747                                         ip_mask, INET6_ADDRSTRLEN) != NULL)
 748                 connman_info("\tdst %s/%s", ip_string, ip_mask);
 749 }
 750
 751 static void dump_target(struct connman_iptables *table,
 752                                 struct ipt_entry *entry)
 753
 754 {
 755         struct xtables_target *xt_t;
 756         struct xt_entry_target *target;
 757
 758         target = ipt_get_target(entry);
 759
 760         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
 761                 struct xt_standard_target *t;
 762
 763                 t = (struct xt_standard_target *)target;
 764
 765                 switch (t->verdict) {
 766                 case XT_RETURN:
 767                         connman_info("\ttarget RETURN");
 768                         break;
 769
 770                 case -NF_ACCEPT - 1:
 771                         connman_info("\ttarget ACCEPT");
 772                         break;
 773
 774                 case -NF_DROP - 1:
 775                         connman_info("\ttarget DROP");
 776                         break;
 777
 778                 case -NF_QUEUE - 1:
 779                         connman_info("\ttarget QUEUE");
 780                         break;
 781
 782                 case -NF_STOP - 1:
 783                         connman_info("\ttarget STOP");
 784                         break;
 785
 786                 default:
 787                         connman_info("\tJUMP @%p (0x%x)",
 788                                 (char*)table->blob_entries->entrytable +
 789                                 t->verdict, t->verdict);
 790                         break;
 791                 }
 792
 793                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
 794                                                 XTF_LOAD_MUST_SUCCEED);
 795
 796                 if(xt_t->print != NULL)
 797                         xt_t->print(NULL, target, 1);
 798         } else {
 799                 xt_t = xtables_find_target(target->u.user.name, XTF_TRY_LOAD);
 800                 if (xt_t == NULL) {
 801                         connman_info("\ttarget %s", target->u.user.name);
 802                         return;
 803                 }
 804
 805                 if(xt_t->print != NULL) {
 806                         connman_info("\ttarget ");
 807                         xt_t->print(NULL, target, 1);
 808                 }
 809         }
 810 }
 811
 812 static void dump_match(struct connman_iptables *table, struct ipt_entry *entry)
 813 {
 814         struct xtables_match *xt_m;
 815         struct xt_entry_match *match;
 816
 817         if (entry->elems == (unsigned char *)entry + entry->target_offset)
 818                 return;
 819
 820         match = (struct xt_entry_match *) entry->elems;
 821
 822         if (!strlen(match->u.user.name))
 823                 return;
 824
 825         xt_m = xtables_find_match(match->u.user.name, XTF_TRY_LOAD, NULL);
 826         if (xt_m == NULL)
 827                 goto out;
 828
 829         if(xt_m->print != NULL) {
 830                 connman_info("\tmatch ");
 831                 xt_m->print(NULL, match, 1);
 832
 833                 return;
 834         }
 835
 836 out:
 837         connman_info("\tmatch %s", match->u.user.name);
 838
 839 }
 840
 841 static int dump_entry(struct ipt_entry *entry,
 842                                 struct connman_iptables *table)
 843 {
 844         struct xt_entry_target *target;
 845         unsigned int offset;
 846         int builtin;
 847
 848         offset = (char *)entry - (char *)table->blob_entries->entrytable;
 849         target = ipt_get_target(entry);
 850         builtin = is_hook_entry(table, entry);
 851
 852         if (entry_to_offset(table, entry) + entry->next_offset ==
 853                                         table->blob_entries->size) {
 854                 connman_info("End of CHAIN 0x%x", offset);
 855                 return 0;
 856         }
 857
 858         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET)) {
 859                 connman_info("USER CHAIN (%s) %p  match %p  target %p  size %d",
 860                         target->data, entry, entry->elems,
 861                         (char *)entry + entry->target_offset,
 862                                 entry->next_offset);
 863
 864                 return 0;
 865         } else if (builtin >= 0) {
 866                 connman_info("CHAIN (%s) %p  match %p  target %p  size %d",
 867                         hooknames[builtin], entry, entry->elems,
 868                         (char *)entry + entry->target_offset,
 869                                 entry->next_offset);
 870         } else {
 871                 connman_info("RULE %p  match %p  target %p  size %d", entry,
 872                         entry->elems,
 873                         (char *)entry + entry->target_offset,
 874                                 entry->next_offset);
 875         }
 876
 877         dump_match(table, entry);
 878         dump_target(table, entry);
 879         dump_ip(entry);
 880
 881         return 0;
 882 }
 883
 884 static void iptables_dump(struct connman_iptables *table)
 885 {
 886         connman_info("%s valid_hooks=0x%08x, num_entries=%u, size=%u",
 887                         table->info->name,
 888                         table->info->valid_hooks, table->info->num_entries,
 889                                 table->info->size);
 890
 891         ENTRY_ITERATE(table->blob_entries->entrytable,
 892                         table->blob_entries->size,
 893                         dump_entry, table);
 894
 895 }
 896
 897 static int iptables_get_entries(struct connman_iptables *table)
 898 {
 899         socklen_t entry_size;
 900
 901         entry_size = sizeof(struct ipt_get_entries) + table->info->size;
 902
 903         return getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_ENTRIES,
 904                                 table->blob_entries, &entry_size);
 905 }
 906
 907 static int iptables_replace(struct connman_iptables *table,
 908                                         struct ipt_replace *r)
 909 {
 910         return setsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_SET_REPLACE, r,
 911                          sizeof(*r) + r->size);
 912 }
 913
 914 static int add_entry(struct ipt_entry *entry, struct connman_iptables *table)
 915 {
 916         struct ipt_entry *new_entry;
 917         int builtin;
 918
 919         new_entry = g_try_malloc0(entry->next_offset);
 920         if (new_entry == NULL)
 921                 return -ENOMEM;
 922
 923         memcpy(new_entry, entry, entry->next_offset);
 924
 925         builtin = is_hook_entry(table, entry);
 926
 927         return iptables_add_entry(table, new_entry, NULL, builtin);
 928 }
 929
 930 static void table_cleanup(struct connman_iptables *table)
 931 {
 932         GList *list;
 933         struct connman_iptables_entry *entry;
 934
 935         close(table->ipt_sock);
 936
 937         for (list = table->entries; list; list = list->next) {
 938                 entry = list->data;
 939
 940                 g_free(entry->entry);
 941                 g_free(entry);
 942         }
 943
 944         g_list_free(table->entries);
 945         g_free(table->info);
 946         g_free(table->blob_entries);
 947         g_free(table);
 948 }
 949
 950 static struct connman_iptables *iptables_init(char *table_name)
 951 {
 952         struct connman_iptables *table;
 953         socklen_t s;
 954
 955         DBG("%s", table_name);
 956
 957         table = g_hash_table_lookup(table_hash, table_name);
 958         if (table != NULL)
 959                 return table;
 960
 961         table = g_try_new0(struct connman_iptables, 1);
 962         if (table == NULL)
 963                 return NULL;
 964
 965         table->info = g_try_new0(struct ipt_getinfo, 1);
 966         if (table->info == NULL)
 967                 goto err;
 968
 969         table->ipt_sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
 970         if (table->ipt_sock < 0)
 971                 goto err;
 972
 973         s = sizeof(*table->info);
 974         strcpy(table->info->name, table_name);
 975         if (getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_INFO,
 976                                                 table->info, &s) < 0)
 977                 goto err;
 978
 979         table->blob_entries = g_try_malloc0(sizeof(struct ipt_get_entries) +
 980                                                 table->info->size);
 981         if (table->blob_entries == NULL)
 982                 goto err;
 983
 984         strcpy(table->blob_entries->name, table_name);
 985         table->blob_entries->size = table->info->size;
 986
 987         if (iptables_get_entries(table) < 0)
 988                 goto err;
 989
 990         table->num_entries = 0;
 991         table->old_entries = table->info->num_entries;
 992         table->size = 0;
 993
 994         memcpy(table->underflow, table->info->underflow,
 995                                 sizeof(table->info->underflow));
 996         memcpy(table->hook_entry, table->info->hook_entry,
 997                                 sizeof(table->info->hook_entry));
 998
 999         ENTRY_ITERATE(table->blob_entries->entrytable,
1000                         table->blob_entries->size,
1001                                 add_entry, table);
1002
1003         g_hash_table_insert(table_hash, g_strdup(table_name), table);
1004
1005         return table;
1006
1007 err:
1008
1009         table_cleanup(table);
1010
1011         return NULL;
1012 }
1013
1014 static struct xtables_target *prepare_target(struct connman_iptables *table,
1015                                                         char *target_name)
1016 {
1017         struct xtables_target *xt_t = NULL;
1018         gboolean is_builtin, is_user_defined;
1019         GList *chain_head = NULL;
1020         size_t target_size;
1021
1022         is_builtin = FALSE;
1023         is_user_defined = FALSE;
1024
1025         if (is_builtin_target(target_name))
1026                 is_builtin = TRUE;
1027         else {
1028                 chain_head = find_chain_head(table, target_name);
1029                 if (chain_head != NULL && chain_head->next != NULL)
1030                         is_user_defined = TRUE;
1031         }
1032
1033         if (is_builtin || is_user_defined)
1034                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
1035                                                 XTF_LOAD_MUST_SUCCEED);
1036         else
1037                 xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
1038
1039         if (xt_t == NULL)
1040                 return NULL;
1041
1042         target_size = ALIGN(sizeof(struct ipt_entry_target)) + xt_t->size;
1043
1044         xt_t->t = g_try_malloc0(target_size);
1045         if (xt_t->t == NULL)
1046                 return NULL;
1047
1048         xt_t->t->u.target_size = target_size;
1049
1050         if (is_builtin || is_user_defined) {
1051                 struct xt_standard_target *target;
1052
1053                 target = (struct xt_standard_target *)(xt_t->t);
1054                 strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
1055
1056                 if (is_builtin == TRUE)
1057                         target->verdict = target_to_verdict(target_name);
1058                 else if (is_user_defined == TRUE) {
1059                         struct connman_iptables_entry *target_rule;
1060
1061                         if (chain_head == NULL) {
1062                                 g_free(xt_t->t);
1063                                 return NULL;
1064                         }
1065
1066                         target_rule = chain_head->next->data;
1067                         target->verdict = target_rule->offset;
1068                 }
1069         } else {
1070                 strcpy(xt_t->t->u.user.name, target_name);
1071                 xt_t->t->u.user.revision = xt_t->revision;
1072                 if (xt_t->init != NULL)
1073                         xt_t->init(xt_t->t);
1074         }
1075
1076         return xt_t;
1077 }
1078
1079 static struct option iptables_opts[] = {
1080         {.name = "append",        .has_arg = 1, .val = 'A'},
1081         {.name = "flush-chain",   .has_arg = 1, .val = 'F'},
1082         {.name = "insert",        .has_arg = 1, .val = 'I'},
1083         {.name = "list",          .has_arg = 2, .val = 'L'},
1084         {.name = "new-chain",     .has_arg = 1, .val = 'N'},
1085         {.name = "delete-chain",  .has_arg = 1, .val = 'X'},
1086         {.name = "destination",   .has_arg = 1, .val = 'd'},
1087         {.name = "in-interface",  .has_arg = 1, .val = 'i'},
1088         {.name = "jump",          .has_arg = 1, .val = 'j'},
1089         {.name = "match",         .has_arg = 1, .val = 'm'},
1090         {.name = "out-interface", .has_arg = 1, .val = 'o'},
1091         {.name = "source",        .has_arg = 1, .val = 's'},
1092         {.name = "table",         .has_arg = 1, .val = 't'},
1093         {NULL},
1094 };
1095
1096 struct xtables_globals iptables_globals = {
1097         .option_offset = 0,
1098         .opts = iptables_opts,
1099         .orig_opts = iptables_opts,
1100 };
1101
1102 static int iptables_command(int argc, char *argv[])
1103 {
1104         struct connman_iptables *table;
1105         struct xtables_match *xt_m;
1106         struct xtables_target *xt_t;
1107         struct ipt_ip ip;
1108         char *table_name, *chain, *new_chain, *match_name, *target_name;
1109         char *flush_chain, *delete_chain;
1110         int c, ret, in_len, out_len;
1111         size_t size;
1112         gboolean dump, invert, insert;
1113         struct in_addr src, dst;
1114
1115         if (argc == 0)
1116                 return -EINVAL;
1117
1118         dump = FALSE;
1119         invert = FALSE;
1120         insert = FALSE;
1121         table_name = chain = new_chain = match_name = target_name = NULL;
1122         flush_chain = delete_chain = NULL;
1123         memset(&ip, 0, sizeof(struct ipt_ip));
1124         table = NULL;
1125         xt_m = NULL;
1126         xt_t = NULL;
1127         ret = 0;
1128
1129         optind = 0;
1130
1131         while ((c = getopt_long(argc, argv, "-A:F:I:L::N:X:d:j:i:m:o:s:t:",
1132                                         iptables_globals.opts, NULL)) != -1) {
1133                 switch (c) {
1134                 case 'A':
1135                         /* It is either -A, -D or -I at once */
1136                         if (chain)
1137                                 goto out;
1138
1139                         chain = optarg;
1140                         break;
1141
1142                 case 'F':
1143                         flush_chain = optarg;
1144                         break;
1145
1146                 case 'I':
1147                         /* It is either -A, -D or -I at once */
1148                         if (chain)
1149                                 goto out;
1150
1151                         chain = optarg;
1152                         insert = TRUE;
1153                         break;
1154
1155                 case 'L':
1156                         dump = TRUE;
1157                         break;
1158
1159                 case 'N':
1160                         new_chain = optarg;
1161                         break;
1162
1163                 case 'X':
1164                         delete_chain = optarg;
1165                         break;
1166
1167                 case 'd':
1168                         if (!inet_pton(AF_INET, optarg, &dst))
1169                                 break;
1170
1171                         ip.dst = dst;
1172                         inet_pton(AF_INET, "255.255.255.255", &ip.dmsk);
1173
1174                         if (invert)
1175                                 ip.invflags |= IPT_INV_DSTIP;
1176
1177                         break;
1178
1179                 case 'i':
1180                         in_len = strlen(optarg);
1181
1182                         if (in_len + 1 > IFNAMSIZ)
1183                                 break;
1184
1185                         strcpy(ip.iniface, optarg);
1186                         memset(ip.iniface_mask, 0xff, in_len + 1);
1187
1188                         if (invert)
1189                                 ip.invflags |= IPT_INV_VIA_IN;
1190
1191                         break;
1192
1193                 case 'j':
1194                         target_name = optarg;
1195                         break;
1196
1197                 case 'm':
1198                         match_name = optarg;
1199
1200                         xt_m = xtables_find_match(optarg, XTF_LOAD_MUST_SUCCEED, NULL);
1201                         size = ALIGN(sizeof(struct ipt_entry_match)) +
1202                                                                 xt_m->size;
1203                         xt_m->m = g_try_malloc0(size);
1204                         if (xt_m == NULL)
1205                                 goto out;
1206                         xt_m->m->u.match_size = size;
1207                         strcpy(xt_m->m->u.user.name, xt_m->name);
1208                         xt_m->m->u.user.revision = xt_m->revision;
1209                         if (xt_m->init != NULL)
1210                                 xt_m->init(xt_m->m);
1211                         if (xt_m != xt_m->next) {
1212                                 iptables_globals.opts =
1213                                 xtables_merge_options(
1214 #if XTABLES_VERSION_CODE > 5
1215                                                 iptables_globals.orig_opts,
1216 #endif
1217                                                 iptables_globals.opts,
1218                                                 xt_m->extra_opts,
1219                                                 &xt_m->option_offset);
1220                                 if (iptables_globals.opts == NULL)
1221                                         goto out;
1222                         }
1223
1224                         break;
1225
1226                 case 'o':
1227                         out_len = strlen(optarg);
1228
1229                         if (out_len + 1 > IFNAMSIZ)
1230                                 break;
1231
1232                         strcpy(ip.outiface, optarg);
1233                         memset(ip.outiface_mask, 0xff, out_len + 1);
1234
1235                         if (invert)
1236                                 ip.invflags |= IPT_INV_VIA_OUT;
1237
1238                         break;
1239
1240                 case 's':
1241                         if (!inet_pton(AF_INET, optarg, &src))
1242                                 break;
1243
1244                         ip.src = src;
1245                         inet_pton(AF_INET, "255.255.255.255", &ip.smsk);
1246
1247                         if (invert)
1248                                 ip.invflags |= IPT_INV_SRCIP;
1249
1250                         break;
1251
1252                 case 't':
1253                         table_name = optarg;
1254                         break;
1255
1256                 case 1:
1257                         if (optarg[0] == '!' && optarg[1] == '\0') {
1258                                 invert = TRUE;
1259                                 optarg[0] = '\0';
1260                                 continue;
1261                         }
1262
1263                         connman_error("Invalid option");
1264
1265                         ret = -EINVAL;
1266                         goto out;
1267
1268                 default:
1269                         if (xt_t == NULL || xt_t->parse == NULL ||
1270                             !xt_t->parse(c - xt_t->option_offset, argv, invert,
1271                                         &xt_t->tflags, NULL, &xt_t->t)) {
1272                                 if (xt_m == NULL || xt_m->parse == NULL)
1273                                         break;
1274
1275                                 xt_m->parse(c - xt_m->option_offset, argv,
1276                                         invert, &xt_m->mflags, NULL, &xt_m->m);
1277                         }
1278
1279                         break;
1280                 }
1281
1282                 invert = FALSE;
1283         }
1284
1285         if (table_name == NULL)
1286                 table_name = "filter";
1287
1288         table = iptables_init(table_name);
1289         if (table == NULL) {
1290                 ret = -EINVAL;
1291                 goto out;
1292         }
1293
1294         if (delete_chain != NULL) {
1295                 printf("Delete chain %s\n", delete_chain);
1296
1297                 iptables_delete_chain(table, delete_chain);
1298
1299                 goto out;
1300         }
1301
1302         if (dump) {
1303                 iptables_dump(table);
1304
1305                 ret = 0;
1306                 goto out;
1307         }
1308
1309         if (flush_chain) {
1310                 DBG("Flush chain %s", flush_chain);
1311
1312                 iptables_flush_chain(table, flush_chain);
1313
1314                 goto out;
1315         }
1316
1317         if (chain && new_chain) {
1318                 ret = -EINVAL;
1319                 goto out;
1320         }
1321
1322         if (new_chain) {
1323                 DBG("New chain %s", new_chain);
1324
1325                 ret = iptables_add_chain(table, new_chain);
1326                 goto out;
1327         }
1328
1329         if (chain) {
1330                 xt_t = prepare_target(table, target_name);
1331                 if (xt_t == NULL)
1332                         goto out;
1333
1334                 iptables_globals.opts =
1335                         xtables_merge_options(
1336 #if XTABLES_VERSION_CODE > 5
1337                                         iptables_globals.orig_opts,
1338 #endif
1339                                         iptables_globals.opts,
1340                                         xt_t->extra_opts,
1341                                         &xt_t->option_offset);
1342                 if (iptables_globals.opts == NULL)
1343                         goto out;
1344
1345                 if (insert == TRUE) {
1346                         DBG("Inserting %s to %s (match %s)",
1347                                         target_name, chain, match_name);
1348
1349                         ret = iptables_insert_rule(table, &ip, chain,
1350                                         target_name, xt_t, match_name, xt_m);
1351
1352                         goto out;
1353                 } else {
1354                         DBG("Adding %s to %s (match %s)",
1355                                         target_name, chain, match_name);
1356
1357                         ret = iptables_append_rule(table, &ip, chain,
1358                                         target_name, xt_t, match_name, xt_m);
1359
1360                         goto out;
1361                 }
1362         }
1363
1364 out:
1365         if (xt_t)
1366                 g_free(xt_t->t);
1367
1368         if (xt_m)
1369                 g_free(xt_m->m);
1370
1371         return ret;
1372 }
1373
1374 int __connman_iptables_command(const char *format, ...)
1375 {
1376         char **argv, **arguments, *command;
1377         int argc, i, ret;
1378         va_list args;
1379
1380         if (format == NULL)
1381                 return -EINVAL;
1382
1383         va_start(args, format);
1384
1385         command = g_strdup_vprintf(format, args);
1386
1387         va_end(args);
1388
1389         if (command == NULL)
1390                 return -ENOMEM;
1391
1392         arguments = g_strsplit_set(command, " ", -1);
1393
1394         for (argc = 0; arguments[argc]; argc++);
1395         ++argc;
1396
1397         DBG("command %s argc %d", command, argc);
1398
1399         argv = g_try_malloc0(argc * sizeof(char *));
1400         if (argv == NULL) {
1401                 g_free(command);
1402                 g_strfreev(arguments);
1403                 return -ENOMEM;
1404         }
1405
1406         argv[0] = "iptables";
1407         for (i = 1; i < argc; i++)
1408                 argv[i] = arguments[i - 1];
1409
1410         ret = iptables_command(argc, argv);
1411
1412         g_free(command);
1413         g_strfreev(arguments);
1414         g_free(argv);
1415
1416         return ret;
1417 }
1418
1419
1420 int __connman_iptables_commit(const char *table_name)
1421 {
1422         struct connman_iptables *table;
1423         struct ipt_replace *repl;
1424         int err;
1425
1426         DBG("%s", table_name);
1427
1428         table = g_hash_table_lookup(table_hash, table_name);
1429         if (table == NULL)
1430                 return -EINVAL;
1431
1432         repl = iptables_blob(table);
1433
1434         err = iptables_replace(table, repl);
1435
1436         g_free(repl->counters);
1437         g_free(repl);
1438
1439         if (err < 0)
1440             return err;
1441
1442         g_hash_table_remove(table_hash, table_name);
1443
1444         return 0;
1445 }
1446
1447 static void remove_table(gpointer user_data)
1448 {
1449         struct connman_iptables *table = user_data;
1450
1451         table_cleanup(table);
1452 }
1453
1454 int __connman_iptables_init(void)
1455 {
1456         DBG("");
1457
1458         table_hash = g_hash_table_new_full(g_str_hash, g_str_equal,
1459                                                 g_free, remove_table);
1460
1461         xtables_init_all(&iptables_globals, NFPROTO_IPV4);
1462
1463         return 0;
1464
1465 }
1466
1467 void __connman_iptables_cleanup(void)
1468 {
1469         DBG("");
1470
1471         g_hash_table_destroy(table_hash);
1472
1473         xtables_free_opts(1);
1474 }