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 ipt_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
  93         struct ipt_entry *entry;
  94 };
  95
  96 struct connman_iptables {
  97         int ipt_sock;
  98
  99         struct ipt_getinfo *info;
 100         struct ipt_get_entries *blob_entries;
 101
 102         unsigned int num_entries;
 103         unsigned int old_entries;
 104         unsigned int size;
 105
 106         GList *entries;
 107 };
 108
 109 static GHashTable *table_hash = NULL;
 110
 111 static struct ipt_entry *get_entry(struct connman_iptables *table,
 112                                         unsigned int offset)
 113 {
 114         return (struct ipt_entry *)((char *)table->blob_entries->entrytable +
 115                                                                         offset);
 116 }
 117
 118 static int is_hook_entry(struct connman_iptables *table,
 119                                 struct ipt_entry *entry)
 120 {
 121         unsigned int i;
 122
 123         for (i = 0; i < NF_INET_NUMHOOKS; i++) {
 124                 if ((table->info->valid_hooks & (1 << i))
 125                 && get_entry(table, table->info->hook_entry[i]) == entry)
 126                         return i;
 127         }
 128
 129         return -1;
 130 }
 131
 132 static unsigned long entry_to_offset(struct connman_iptables *table,
 133                                         struct ipt_entry *entry)
 134 {
 135         return (void *)entry - (void *)table->blob_entries->entrytable;
 136 }
 137
 138 static int target_to_verdict(char *target_name)
 139 {
 140         if (!strcmp(target_name, LABEL_ACCEPT))
 141                 return -NF_ACCEPT - 1;
 142
 143         if (!strcmp(target_name, LABEL_DROP))
 144                 return -NF_DROP - 1;
 145
 146         if (!strcmp(target_name, LABEL_QUEUE))
 147                 return -NF_QUEUE - 1;
 148
 149         if (!strcmp(target_name, LABEL_RETURN))
 150                 return XT_RETURN;
 151
 152         return 0;
 153 }
 154
 155 static gboolean is_builtin_target(char *target_name)
 156 {
 157         if (!strcmp(target_name, LABEL_ACCEPT) ||
 158                 !strcmp(target_name, LABEL_DROP) ||
 159                 !strcmp(target_name, LABEL_QUEUE) ||
 160                 !strcmp(target_name, LABEL_RETURN))
 161                 return TRUE;
 162
 163         return FALSE;
 164 }
 165
 166 static gboolean is_jump(struct connman_iptables_entry *e)
 167 {
 168         struct xt_entry_target *target;
 169
 170         target = ipt_get_target(e->entry);
 171
 172         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
 173                 struct xt_standard_target *t;
 174
 175                 t = (struct xt_standard_target *)target;
 176
 177                 switch (t->verdict) {
 178                 case XT_RETURN:
 179                 case -NF_ACCEPT - 1:
 180                 case -NF_DROP - 1:
 181                 case -NF_QUEUE - 1:
 182                 case -NF_STOP - 1:
 183                         return false;
 184
 185                 default:
 186                         return true;
 187                 }
 188         }
 189
 190         return false;
 191 }
 192
 193 static gboolean is_chain(struct connman_iptables *table,
 194                                 struct connman_iptables_entry *e)
 195 {
 196         int builtin;
 197         struct ipt_entry *entry;
 198         struct xt_entry_target *target;
 199
 200         entry = e->entry;
 201         builtin = is_hook_entry(table, entry);
 202         if (builtin >= 0)
 203                 return TRUE;
 204
 205         target = ipt_get_target(entry);
 206         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET))
 207                 return TRUE;
 208
 209         return FALSE;
 210 }
 211
 212 static GList *find_chain_head(struct connman_iptables *table,
 213                                 char *chain_name)
 214 {
 215         GList *list;
 216         struct connman_iptables_entry *head;
 217         struct ipt_entry *entry;
 218         struct xt_entry_target *target;
 219         int builtin;
 220
 221         for (list = table->entries; list; list = list->next) {
 222                 head = list->data;
 223                 entry = head->entry;
 224
 225                 /* Buit-in chain */
 226                 builtin = is_hook_entry(table, entry);
 227                 if (builtin >= 0 && !strcmp(hooknames[builtin], chain_name))
 228                         break;
 229
 230                 /* User defined chain */
 231                 target = ipt_get_target(entry);
 232                 if (!strcmp(target->u.user.name, IPT_ERROR_TARGET) &&
 233                     !strcmp((char *)target->data, chain_name))
 234                         break;
 235         }
 236
 237         return list;
 238 }
 239
 240 static GList *find_chain_tail(struct connman_iptables *table,
 241                                 char *chain_name)
 242 {
 243         GList *chain_head, *list;
 244         struct connman_iptables_entry *head, *tail;
 245         struct ipt_entry *entry;
 246         struct xt_entry_target *target;
 247         int builtin;
 248
 249         /* First we look for the head */
 250         for (list = table->entries; list; list = list->next) {
 251                 head = list->data;
 252                 entry = head->entry;
 253
 254                 /* Buit-in chain */
 255                 builtin = is_hook_entry(table, entry);
 256                 if (builtin >= 0 && !strcmp(hooknames[builtin], chain_name))
 257                         break;
 258
 259                 /* User defined chain */
 260                 target = ipt_get_target(entry);
 261                 if (!strcmp(target->u.user.name, IPT_ERROR_TARGET) &&
 262                     !strcmp((char *)target->data, chain_name))
 263                         break;
 264         }
 265
 266         if (list == NULL)
 267                 return NULL;
 268
 269         chain_head = list;
 270
 271         /* Then we look for the next chain */
 272         for (list = chain_head->next; list; list = list->next) {
 273                 tail = list->data;
 274                 entry = tail->entry;
 275
 276                 if (is_chain(table, tail))
 277                         return list;
 278         }
 279
 280         /* Nothing found, we return the table end */
 281         return g_list_last(table->entries);
 282 }
 283
 284
 285 static void update_offsets(struct connman_iptables *table)
 286 {
 287         GList *list, *prev;
 288         struct connman_iptables_entry *entry, *prev_entry;
 289
 290         for (list = table->entries; list; list = list->next) {
 291                 entry = list->data;
 292
 293                 if (list == table->entries) {
 294                         entry->offset = 0;
 295
 296                         continue;
 297                 }
 298
 299                 prev = list->prev;
 300                 prev_entry = prev->data;
 301
 302                 entry->offset = prev_entry->offset +
 303                                         prev_entry->entry->next_offset;
 304         }
 305 }
 306
 307 static int iptables_add_entry(struct connman_iptables *table,
 308                                 struct ipt_entry *entry, GList *before)
 309 {
 310         GList *list;
 311         struct connman_iptables_entry *e, *tmp, *entry_before;
 312         struct xt_standard_target *t;
 313
 314         if (table == NULL)
 315                 return -1;
 316
 317         e = g_try_malloc0(sizeof(struct connman_iptables_entry));
 318         if (e == NULL)
 319                 return -1;
 320
 321         e->entry = entry;
 322
 323         table->entries = g_list_insert_before(table->entries, before, e);
 324         table->num_entries++;
 325         table->size += entry->next_offset;
 326
 327         if (before == NULL) {
 328                 e->offset = table->size - entry->next_offset;
 329
 330                 return 0;
 331         }
 332
 333         entry_before = before->data;
 334
 335         /*
 336          * We've just insterted a new entry. All references before it
 337          * should be bumped accordingly.
 338          */
 339         for (list = table->entries; list != before; list = list->next) {
 340                 tmp = list->data;
 341
 342                 if (!is_jump(tmp))
 343                         continue;
 344
 345                 t = (struct xt_standard_target *)ipt_get_target(tmp->entry);
 346
 347                 if (t->verdict >= entry_before->offset)
 348                         t->verdict += entry->next_offset;
 349         }
 350
 351         update_offsets(table);
 352
 353         return 0;
 354 }
 355
 356 static int iptables_add_chain(struct connman_iptables *table,
 357                                         char *name)
 358 {
 359         GList *last;
 360         struct ipt_entry *entry_head;
 361         struct ipt_entry *entry_return;
 362         struct ipt_error_target *error;
 363         struct ipt_standard_target *standard;
 364         u_int16_t entry_head_size, entry_return_size;
 365
 366         last = g_list_last(table->entries);
 367
 368         /*
 369          * An empty chain is composed of:
 370          * - A head entry, with no match and an error target.
 371          *   The error target data is the chain name.
 372          * - A tail entry, with no match and a standard target.
 373          *   The standard target verdict is XT_RETURN (return to the
 374          *   caller).
 375          */
 376
 377         /* head entry */
 378         entry_head_size = sizeof(struct ipt_entry) +
 379                                 sizeof(struct ipt_error_target);
 380         entry_head = g_try_malloc0(entry_head_size);
 381         if (entry_head == NULL)
 382                 goto err;
 383
 384         memset(entry_head, 0, entry_head_size);
 385
 386         entry_head->target_offset = sizeof(struct ipt_entry);
 387         entry_head->next_offset = entry_head_size;
 388
 389         error = (struct ipt_error_target *) entry_head->elems;
 390         strcpy(error->t.u.user.name, IPT_ERROR_TARGET);
 391         error->t.u.user.target_size = ALIGN(sizeof(struct ipt_error_target));
 392         strcpy(error->error, name);
 393
 394         if (iptables_add_entry(table, entry_head, last) < 0)
 395                 goto err;
 396
 397         /* tail entry */
 398         entry_return_size = sizeof(struct ipt_entry) +
 399                                 sizeof(struct ipt_standard_target);
 400         entry_return = g_try_malloc0(entry_return_size);
 401         if (entry_return == NULL)
 402                 goto err;
 403
 404         memset(entry_return, 0, entry_return_size);
 405
 406         entry_return->target_offset = sizeof(struct ipt_entry);
 407         entry_return->next_offset = entry_return_size;
 408
 409         standard = (struct ipt_standard_target *) entry_return->elems;
 410         standard->target.u.user.target_size =
 411                                 ALIGN(sizeof(struct ipt_standard_target));
 412         standard->verdict = XT_RETURN;
 413
 414         if (iptables_add_entry(table, entry_return, last) < 0)
 415                 goto err;
 416
 417         return 0;
 418
 419 err:
 420         g_free(entry_head);
 421         g_free(entry_return);
 422
 423         return -ENOMEM;
 424 }
 425
 426 static struct ipt_entry *
 427 new_rule(struct connman_iptables *table, struct ipt_ip *ip,
 428                 char *target_name, struct xtables_target *xt_t,
 429                 char *match_name, struct xtables_match *xt_m)
 430 {
 431         struct ipt_entry *new_entry;
 432         size_t match_size, target_size;
 433         int is_builtin = is_builtin_target(target_name);
 434
 435         if (xt_m)
 436                 match_size = xt_m->m->u.match_size;
 437         else
 438                 match_size = 0;
 439
 440         if (xt_t)
 441                 target_size = ALIGN(xt_t->t->u.target_size);
 442         else
 443                 target_size = ALIGN(sizeof(struct xt_standard_target));
 444
 445         new_entry = g_try_malloc0(sizeof(struct ipt_entry) + target_size +
 446                                                                 match_size);
 447         if (new_entry == NULL)
 448                 return NULL;
 449
 450         memcpy(&new_entry->ip, ip, sizeof(struct ipt_ip));
 451
 452         new_entry->target_offset = sizeof(struct ipt_entry) + match_size;
 453         new_entry->next_offset = sizeof(struct ipt_entry) + target_size +
 454                                                                 match_size;
 455         if (xt_m) {
 456                 struct xt_entry_match *entry_match;
 457
 458                 entry_match = (struct xt_entry_match *)new_entry->elems;
 459                 memcpy(entry_match, xt_m->m, match_size);
 460         }
 461
 462         if (xt_t) {
 463                 struct xt_entry_target *entry_target;
 464
 465                 if (is_builtin) {
 466                         struct xt_standard_target *target;
 467
 468                         target = (struct xt_standard_target *)(xt_t->t);
 469                         strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
 470                         target->verdict = target_to_verdict(target_name);
 471                 }
 472
 473                 entry_target = ipt_get_target(new_entry);
 474                 memcpy(entry_target, xt_t->t, target_size);
 475         } else {
 476                 struct connman_iptables_entry *target_rule;
 477                 struct xt_standard_target *target;
 478                 GList *chain_head;
 479
 480                 /*
 481                  * This is a user defined target, i.e. a chain jump.
 482                  * We search for the chain head, and the target verdict
 483                  * is the first rule's offset on this chain.
 484                  * The offset is from the beginning of the table.
 485                  */
 486
 487                 chain_head = find_chain_head(table, target_name);
 488                 if (chain_head == NULL || chain_head->next == NULL) {
 489                         g_free(new_entry);
 490                         return NULL;
 491                 }
 492
 493                 target_rule = chain_head->next->data;
 494
 495                 target = (struct xt_standard_target *)ipt_get_target(new_entry);
 496                 strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
 497                 target->target.u.user.target_size = target_size;
 498                 target->verdict = target_rule->offset;
 499         }
 500
 501         return new_entry;
 502 }
 503
 504 static int
 505 iptables_add_rule(struct connman_iptables *table,
 506                                 struct ipt_ip *ip, char *chain_name,
 507                                 char *target_name, struct xtables_target *xt_t,
 508                                 char *match_name, struct xtables_match *xt_m)
 509 {
 510         GList *chain_tail;
 511         struct ipt_entry *new_entry;
 512
 513         chain_tail = find_chain_tail(table, chain_name);
 514         if (chain_tail == NULL)
 515                 return -EINVAL;
 516
 517         new_entry = new_rule(table, ip,
 518                                 target_name, xt_t,
 519                                 match_name, xt_m);
 520         if (new_entry == NULL)
 521                 return -EINVAL;
 522
 523         return iptables_add_entry(table, new_entry, chain_tail->prev);
 524 }
 525
 526 static struct ipt_replace *
 527 iptables_blob(struct connman_iptables *table)
 528 {
 529         struct ipt_replace *r;
 530         GList *list;
 531         struct connman_iptables_entry *e;
 532         unsigned char *entry_index;
 533
 534         r = g_try_malloc0(sizeof(struct ipt_replace) + table->size);
 535         if (r == NULL)
 536                 return NULL;
 537
 538         memset(r, 0, sizeof(*r) + table->size);
 539
 540         r->counters = g_try_malloc0(sizeof(struct xt_counters)
 541                                 * table->num_entries);
 542         if (r->counters == NULL) {
 543                 g_free(r);
 544                 return NULL;
 545         }
 546
 547         strcpy(r->name, table->info->name);
 548         r->num_entries = table->num_entries;
 549         r->size = table->size;
 550
 551         r->num_counters = table->old_entries;
 552         r->valid_hooks  = table->info->valid_hooks;
 553
 554         memcpy(r->hook_entry, table->info->hook_entry,
 555                                 sizeof(table->info->hook_entry));
 556         memcpy(r->underflow, table->info->underflow,
 557                                 sizeof(table->info->underflow));
 558
 559         entry_index = (unsigned char *)r->entries;
 560         for (list = table->entries; list; list = list->next) {
 561                 e = list->data;
 562
 563                 memcpy(entry_index, e->entry, e->entry->next_offset);
 564                 entry_index += e->entry->next_offset;
 565         }
 566
 567         return r;
 568 }
 569
 570 static void dump_ip(struct ipt_entry *entry)
 571 {
 572         struct ipt_ip *ip = &entry->ip;
 573
 574         if (strlen(ip->iniface))
 575                 connman_info("\tin %s", ip->iniface);
 576
 577         if (strlen(ip->outiface))
 578                 connman_info("\tout %s", ip->outiface);
 579 }
 580
 581 static void dump_target(struct connman_iptables *table,
 582                                 struct ipt_entry *entry)
 583
 584 {
 585         struct xtables_target *xt_t;
 586         struct xt_entry_target *target;
 587
 588         target = ipt_get_target(entry);
 589
 590         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
 591                 struct xt_standard_target *t;
 592
 593                 t = (struct xt_standard_target *)target;
 594
 595                 switch (t->verdict) {
 596                 case XT_RETURN:
 597                         connman_info("\ttarget RETURN");
 598                         break;
 599
 600                 case -NF_ACCEPT - 1:
 601                         connman_info("\ttarget ACCEPT");
 602                         break;
 603
 604                 case -NF_DROP - 1:
 605                         connman_info("\ttarget DROP");
 606                         break;
 607
 608                 case -NF_QUEUE - 1:
 609                         connman_info("\ttarget QUEUE");
 610                         break;
 611
 612                 case -NF_STOP - 1:
 613                         connman_info("\ttarget STOP");
 614                         break;
 615
 616                 default:
 617                         connman_info("\tJUMP @%p (0x%x)",
 618                                 (char*)table->blob_entries->entrytable +
 619                                 t->verdict, t->verdict);
 620                         break;
 621                 }
 622
 623                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
 624                                                 XTF_LOAD_MUST_SUCCEED);
 625
 626                 if(xt_t->print != NULL)
 627                         xt_t->print(NULL, target, 1);
 628         } else {
 629                 xt_t = xtables_find_target(target->u.user.name, XTF_TRY_LOAD);
 630                 if (xt_t == NULL) {
 631                         connman_info("\ttarget %s", target->u.user.name);
 632                         return;
 633                 }
 634
 635                 if(xt_t->print != NULL) {
 636                         connman_info("\ttarget ");
 637                         xt_t->print(NULL, target, 1);
 638                 }
 639         }
 640 }
 641
 642 static void dump_match(struct connman_iptables *table, struct ipt_entry *entry)
 643 {
 644         struct xtables_match *xt_m;
 645         struct xt_entry_match *match;
 646
 647         if (entry->elems == (unsigned char *)entry + entry->target_offset)
 648                 return;
 649
 650         match = (struct xt_entry_match *) entry->elems;
 651
 652         if (!strlen(match->u.user.name))
 653                 return;
 654
 655         xt_m = xtables_find_match(match->u.user.name, XTF_TRY_LOAD, NULL);
 656         if (xt_m == NULL)
 657                 goto out;
 658
 659         if(xt_m->print != NULL) {
 660                 connman_info("\tmatch ");
 661                 xt_m->print(NULL, match, 1);
 662
 663                 return;
 664         }
 665
 666 out:
 667         connman_info("\tmatch %s", match->u.user.name);
 668
 669 }
 670
 671 static int dump_entry(struct ipt_entry *entry,
 672                                 struct connman_iptables *table)
 673 {
 674         struct xt_entry_target *target;
 675         unsigned int offset;
 676         int builtin;
 677
 678         offset = (char *)entry - (char *)table->blob_entries->entrytable;
 679         target = ipt_get_target(entry);
 680         builtin = is_hook_entry(table, entry);
 681
 682         if (entry_to_offset(table, entry) + entry->next_offset ==
 683                                         table->blob_entries->size) {
 684                 connman_info("End of CHAIN 0x%x", offset);
 685                 return 0;
 686         }
 687
 688         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET)) {
 689                 connman_info("USER CHAIN (%s) %p  match %p  target %p  size %d",
 690                         target->data, entry, entry->elems,
 691                         (char *)entry + entry->target_offset,
 692                                 entry->next_offset);
 693
 694                 return 0;
 695         } else if (builtin >= 0) {
 696                 connman_info("CHAIN (%s) %p  match %p  target %p  size %d",
 697                         hooknames[builtin], entry, entry->elems,
 698                         (char *)entry + entry->target_offset,
 699                                 entry->next_offset);
 700         } else {
 701                 connman_info("RULE %p  match %p  target %p  size %d", entry,
 702                         entry->elems,
 703                         (char *)entry + entry->target_offset,
 704                                 entry->next_offset);
 705         }
 706
 707         dump_match(table, entry);
 708         dump_target(table, entry);
 709         dump_ip(entry);
 710
 711         return 0;
 712 }
 713
 714 static void iptables_dump(struct connman_iptables *table)
 715 {
 716         connman_info("%s valid_hooks=0x%08x, num_entries=%u, size=%u",
 717                         table->info->name,
 718                         table->info->valid_hooks, table->info->num_entries,
 719                                 table->info->size);
 720
 721         ENTRY_ITERATE(table->blob_entries->entrytable,
 722                         table->blob_entries->size,
 723                         dump_entry, table);
 724
 725 }
 726
 727 static int iptables_get_entries(struct connman_iptables *table)
 728 {
 729         socklen_t entry_size;
 730
 731         entry_size = sizeof(struct ipt_get_entries) + table->info->size;
 732
 733         return getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_ENTRIES,
 734                                 table->blob_entries, &entry_size);
 735 }
 736
 737 static int iptables_replace(struct connman_iptables *table,
 738                                         struct ipt_replace *r)
 739 {
 740         return setsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_SET_REPLACE, r,
 741                          sizeof(*r) + r->size);
 742 }
 743
 744 static int add_entry(struct ipt_entry *entry, struct connman_iptables *table)
 745 {
 746         struct ipt_entry *new_entry;
 747
 748         new_entry = g_try_malloc0(entry->next_offset);
 749         if (new_entry == NULL)
 750                 return -ENOMEM;
 751
 752         memcpy(new_entry, entry, entry->next_offset);
 753
 754         return iptables_add_entry(table, new_entry, NULL);
 755 }
 756
 757 static void table_cleanup(struct connman_iptables *table)
 758 {
 759         GList *list;
 760         struct connman_iptables_entry *entry;
 761
 762         close(table->ipt_sock);
 763
 764         for (list = table->entries; list; list = list->next) {
 765                 entry = list->data;
 766
 767                 g_free(entry->entry);
 768         }
 769
 770         g_list_free(table->entries);
 771         g_free(table->info);
 772         g_free(table->blob_entries);
 773         g_free(table);
 774 }
 775
 776 static struct connman_iptables *iptables_init(char *table_name)
 777 {
 778         struct connman_iptables *table;
 779         socklen_t s;
 780
 781         table = g_hash_table_lookup(table_hash, table_name);
 782         if (table != NULL)
 783                 return table;
 784
 785         table = g_try_new0(struct connman_iptables, 1);
 786         if (table == NULL)
 787                 return NULL;
 788
 789         table->info = g_try_new0(struct ipt_getinfo, 1);
 790         if (table->info == NULL)
 791                 goto err;
 792
 793         table->ipt_sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
 794         if (table->ipt_sock < 0)
 795                 goto err;
 796
 797         s = sizeof(*table->info);
 798         strcpy(table->info->name, table_name);
 799         if (getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_INFO,
 800                                                 table->info, &s) < 0)
 801                 goto err;
 802
 803         table->blob_entries = g_try_malloc0(sizeof(struct ipt_get_entries) +
 804                                                 table->info->size);
 805         if (table->blob_entries == NULL)
 806                 goto err;
 807
 808         strcpy(table->blob_entries->name, table_name);
 809         table->blob_entries->size = table->info->size;
 810
 811         if (iptables_get_entries(table) < 0)
 812                 goto err;
 813
 814         table->num_entries = 0;
 815         table->old_entries = table->info->num_entries;
 816         table->size = 0;
 817
 818         ENTRY_ITERATE(table->blob_entries->entrytable,
 819                         table->blob_entries->size,
 820                                 add_entry, table);
 821
 822         g_hash_table_insert(table_hash, table_name, table);
 823
 824         return table;
 825
 826 err:
 827
 828         table_cleanup(table);
 829
 830         return NULL;
 831 }
 832
 833 static struct option iptables_opts[] = {
 834         {.name = "append",        .has_arg = 1, .val = 'A'},
 835         {.name = "list",          .has_arg = 2, .val = 'L'},
 836         {.name = "new-chain",     .has_arg = 1, .val = 'N'},
 837         {.name = "in-interface",  .has_arg = 1, .val = 'i'},
 838         {.name = "jump",          .has_arg = 1, .val = 'j'},
 839         {.name = "match",         .has_arg = 1, .val = 'm'},
 840         {.name = "out-interface", .has_arg = 1, .val = 'o'},
 841         {.name = "table",         .has_arg = 1, .val = 't'},
 842         {NULL},
 843 };
 844
 845 struct xtables_globals iptables_globals = {
 846         .option_offset = 0,
 847         .opts = iptables_opts,
 848         .orig_opts = iptables_opts,
 849 };
 850
 851 static int iptables_command(int argc, char *argv[])
 852 {
 853         struct connman_iptables *table;
 854         struct xtables_match *xt_m;
 855         struct xtables_target *xt_t;
 856         struct ipt_ip ip;
 857         char *table_name, *chain, *new_chain, *match_name, *target_name;
 858         int c, ret, in_len, out_len;
 859         size_t size;
 860         gboolean dump, invert;
 861
 862         if (argc == 0)
 863                 return -EINVAL;
 864
 865         dump = FALSE;
 866         invert = FALSE;
 867         table_name = chain = new_chain = match_name = target_name = NULL;
 868         memset(&ip, 0, sizeof(struct ipt_ip));
 869         table = NULL;
 870         xt_m = NULL;
 871         xt_t = NULL;
 872         ret = 0;
 873
 874         optind = 0;
 875
 876         while ((c = getopt_long(argc, argv,
 877            "-A:L::N:j:i:m:o:t:", iptables_globals.opts, NULL)) != -1) {
 878                 switch (c) {
 879                 case 'A':
 880                         chain = optarg;
 881                         break;
 882
 883                 case 'L':
 884                         dump = TRUE;
 885                         break;
 886
 887                 case 'N':
 888                         new_chain = optarg;
 889                         break;
 890
 891                 case 'i':
 892                         in_len = strlen(optarg);
 893
 894                         if (in_len + 1 > IFNAMSIZ)
 895                                 break;
 896
 897                         strcpy(ip.iniface, optarg);
 898                         memset(ip.iniface_mask, 0xff, in_len + 1);
 899
 900                         break;
 901
 902                 case 'j':
 903                         target_name = optarg;
 904                         xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
 905
 906                         if (xt_t == NULL)
 907                                 break;
 908
 909                         size = ALIGN(sizeof(struct ipt_entry_target)) +
 910                                                                 xt_t->size;
 911
 912                         xt_t->t = g_try_malloc0(size);
 913                         if (xt_t->t == NULL)
 914                                 goto out;
 915                         xt_t->t->u.target_size = size;
 916                         strcpy(xt_t->t->u.user.name, target_name);
 917                         xt_t->t->u.user.revision = xt_t->revision;
 918                         if (xt_t->init != NULL)
 919                                 xt_t->init(xt_t->t);
 920                         iptables_globals.opts =
 921                                 xtables_merge_options(iptables_globals.opts,
 922                                                      xt_t->extra_opts,
 923                                                      &xt_t->option_offset);
 924                         if (iptables_globals.opts == NULL)
 925                                 goto out;
 926
 927                         break;
 928
 929                 case 'm':
 930                         match_name = optarg;
 931
 932                         xt_m = xtables_find_match(optarg, XTF_LOAD_MUST_SUCCEED, NULL);
 933                         size = ALIGN(sizeof(struct ipt_entry_match)) +
 934                                                                 xt_m->size;
 935                         xt_m->m = g_try_malloc0(size);
 936                         if (xt_m == NULL)
 937                                 goto out;
 938                         xt_m->m->u.match_size = size;
 939                         strcpy(xt_m->m->u.user.name, xt_m->name);
 940                         xt_m->m->u.user.revision = xt_m->revision;
 941                         if (xt_m->init != NULL)
 942                                 xt_m->init(xt_m->m);
 943                         if (xt_m != xt_m->next) {
 944                                 iptables_globals.opts =
 945                                 xtables_merge_options(iptables_globals.opts,
 946                                                 xt_m->extra_opts,
 947                                                 &xt_m->option_offset);
 948                                 if (iptables_globals.opts == NULL)
 949                                         goto out;
 950                         }
 951
 952                         break;
 953
 954                 case 'o':
 955                         out_len = strlen(optarg);
 956
 957                         if (out_len + 1 > IFNAMSIZ)
 958                                 break;
 959
 960                         strcpy(ip.outiface, optarg);
 961                         memset(ip.outiface_mask, 0xff, out_len + 1);
 962
 963                         break;
 964
 965                 case 't':
 966                         table_name = optarg;
 967                         break;
 968
 969                 case 1:
 970                         if (optarg[0] == '!' && optarg[1] == '\0') {
 971                                 invert = TRUE;
 972                                 optarg[0] = '\0';
 973                                 continue;
 974                         }
 975
 976                         connman_error("Invalid option");
 977
 978                         ret = -EINVAL;
 979                         goto out;
 980
 981                 default:
 982                         if (xt_t == NULL || xt_t->parse == NULL ||
 983                             !xt_t->parse(c - xt_t->option_offset, argv, invert,
 984                                         &xt_t->tflags, NULL, &xt_t->t)) {
 985                                 if (xt_m == NULL || xt_m->parse == NULL)
 986                                         break;
 987
 988                                 xt_m->parse(c - xt_m->option_offset, argv,
 989                                         invert, &xt_m->mflags, NULL, &xt_m->m);
 990                         }
 991
 992                         break;
 993                 }
 994         }
 995
 996         if (table_name == NULL)
 997                 table_name = "filter";
 998
 999         table = iptables_init(table_name);
1000         if (table == NULL) {
1001                 ret = -EINVAL;
1002                 goto out;
1003         }
1004
1005         if (dump) {
1006                 iptables_dump(table);
1007
1008                 ret = 0;
1009                 goto out;
1010         }
1011
1012         if (chain && new_chain) {
1013                 ret = -EINVAL;
1014                 goto out;
1015         }
1016
1017         if (new_chain) {
1018                 DBG("New chain %s", new_chain);
1019
1020                 ret = iptables_add_chain(table, new_chain);
1021                 goto out;
1022         }
1023
1024         if (chain) {
1025                 if (target_name == NULL)
1026                         return -1;
1027
1028                 DBG("Adding %s to %s (match %s)",
1029                                 target_name, chain, match_name);
1030
1031                 ret = iptables_add_rule(table, &ip, chain, target_name, xt_t,
1032                                         match_name, xt_m);
1033
1034                 goto out;
1035         }
1036
1037 out:
1038         if (xt_t)
1039                 g_free(xt_t->t);
1040
1041         if (xt_m)
1042                 g_free(xt_m->m);
1043
1044         return ret;
1045 }
1046
1047 int __connman_iptables_command(const char *format, ...)
1048 {
1049         char **argv, **arguments, *command;
1050         int argc, i, ret;
1051         va_list args;
1052
1053         if (format == NULL)
1054                 return -EINVAL;
1055
1056         va_start(args, format);
1057
1058         command = g_strdup_vprintf(format, args);
1059
1060         va_end(args);
1061
1062         if (command == NULL)
1063                 return -ENOMEM;
1064
1065         arguments = g_strsplit_set(command, " ", -1);
1066
1067         for (argc = 0; arguments[argc]; argc++);
1068
1069         DBG("command %s argc %d", command, ++argc);
1070
1071         argv = g_try_malloc0(argc * sizeof(char *));
1072         if (argv == NULL) {
1073                 g_free(command);
1074                 g_strfreev(arguments);
1075                 return -ENOMEM;
1076         }
1077
1078         argv[0] = "iptables";
1079         for (i = 1; i < argc; i++)
1080                 argv[i] = arguments[i - 1];
1081
1082         ret = iptables_command(argc, argv);
1083
1084         g_free(command);
1085         g_strfreev(arguments);
1086         g_free(argv);
1087
1088         return ret;
1089 }
1090
1091
1092 int __connman_iptables_commit(const char *table_name)
1093 {
1094         struct connman_iptables *table;
1095         struct ipt_replace *repl;
1096
1097         table = g_hash_table_lookup(table_hash, table_name);
1098         if (table == NULL)
1099                 return -EINVAL;
1100
1101         repl = iptables_blob(table);
1102
1103         return iptables_replace(table, repl);
1104 }
1105
1106 static void remove_table(gpointer user_data)
1107 {
1108         struct connman_iptables *table = user_data;
1109
1110         table_cleanup(table);
1111 }
1112
1113 int __connman_iptables_init(void)
1114 {
1115         DBG("");
1116
1117         table_hash = g_hash_table_new_full(g_str_hash, g_str_equal,
1118                                                 NULL, remove_table);
1119
1120         xtables_init_all(&iptables_globals, NFPROTO_IPV4);
1121
1122         return 0;
1123
1124 }
1125
1126 void __connman_iptables_cleanup(void)
1127 {
1128         g_hash_table_destroy(table_hash);
1129
1130         xtables_free_opts(1);
1131 }