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         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         GList *chain_head, *list;
 246         struct connman_iptables_entry *head, *tail;
 247         struct ipt_entry *entry;
 248         struct xt_entry_target *target;
 249         int builtin;
 250
 251         /* First we look for the head */
 252         for (list = table->entries; list; list = list->next) {
 253                 head = list->data;
 254                 entry = head->entry;
 255
 256                 /* Buit-in chain */
 257                 builtin = head->builtin;
 258                 if (builtin >= 0 && !strcmp(hooknames[builtin], chain_name))
 259                         break;
 260
 261                 /* User defined chain */
 262                 target = ipt_get_target(entry);
 263                 if (!strcmp(target->u.user.name, IPT_ERROR_TARGET) &&
 264                     !strcmp((char *)target->data, chain_name))
 265                         break;
 266         }
 267
 268         if (list == NULL)
 269                 return NULL;
 270
 271         chain_head = list;
 272
 273         /* Then we look for the next chain */
 274         for (list = chain_head->next; list; list = list->next) {
 275                 tail = list->data;
 276                 entry = tail->entry;
 277
 278                 if (is_chain(table, tail))
 279                         return list;
 280         }
 281
 282         /* Nothing found, we return the table end */
 283         return g_list_last(table->entries);
 284 }
 285
 286
 287 static void update_offsets(struct connman_iptables *table)
 288 {
 289         GList *list, *prev;
 290         struct connman_iptables_entry *entry, *prev_entry;
 291
 292         for (list = table->entries; list; list = list->next) {
 293                 entry = list->data;
 294
 295                 if (list == table->entries) {
 296                         entry->offset = 0;
 297
 298                         continue;
 299                 }
 300
 301                 prev = list->prev;
 302                 prev_entry = prev->data;
 303
 304                 entry->offset = prev_entry->offset +
 305                                         prev_entry->entry->next_offset;
 306         }
 307 }
 308
 309 static int iptables_add_entry(struct connman_iptables *table,
 310                                 struct ipt_entry *entry, GList *before,
 311                                         int builtin)
 312 {
 313         GList *list;
 314         struct connman_iptables_entry *e, *tmp, *entry_before;
 315         struct xt_standard_target *t;
 316
 317         if (table == NULL)
 318                 return -1;
 319
 320         e = g_try_malloc0(sizeof(struct connman_iptables_entry));
 321         if (e == NULL)
 322                 return -1;
 323
 324         e->entry = entry;
 325         e->builtin = builtin;
 326
 327         table->entries = g_list_insert_before(table->entries, before, e);
 328         table->num_entries++;
 329         table->size += entry->next_offset;
 330
 331         if (before == NULL) {
 332                 e->offset = table->size - entry->next_offset;
 333
 334                 return 0;
 335         }
 336
 337         entry_before = before->data;
 338
 339         /*
 340          * We've just insterted a new entry. All references before it
 341          * should be bumped accordingly.
 342          */
 343         for (list = table->entries; list != before; list = list->next) {
 344                 tmp = list->data;
 345
 346                 if (!is_jump(tmp))
 347                         continue;
 348
 349                 t = (struct xt_standard_target *)ipt_get_target(tmp->entry);
 350
 351                 if (t->verdict >= entry_before->offset)
 352                         t->verdict += entry->next_offset;
 353         }
 354
 355         update_offsets(table);
 356
 357         return 0;
 358 }
 359
 360 static int iptables_add_chain(struct connman_iptables *table,
 361                                         char *name)
 362 {
 363         GList *last;
 364         struct ipt_entry *entry_head;
 365         struct ipt_entry *entry_return;
 366         struct ipt_error_target *error;
 367         struct ipt_standard_target *standard;
 368         u_int16_t entry_head_size, entry_return_size;
 369
 370         last = g_list_last(table->entries);
 371
 372         /*
 373          * An empty chain is composed of:
 374          * - A head entry, with no match and an error target.
 375          *   The error target data is the chain name.
 376          * - A tail entry, with no match and a standard target.
 377          *   The standard target verdict is XT_RETURN (return to the
 378          *   caller).
 379          */
 380
 381         /* head entry */
 382         entry_head_size = sizeof(struct ipt_entry) +
 383                                 sizeof(struct ipt_error_target);
 384         entry_head = g_try_malloc0(entry_head_size);
 385         if (entry_head == NULL)
 386                 goto err;
 387
 388         memset(entry_head, 0, entry_head_size);
 389
 390         entry_head->target_offset = sizeof(struct ipt_entry);
 391         entry_head->next_offset = entry_head_size;
 392
 393         error = (struct ipt_error_target *) entry_head->elems;
 394         strcpy(error->t.u.user.name, IPT_ERROR_TARGET);
 395         error->t.u.user.target_size = ALIGN(sizeof(struct ipt_error_target));
 396         strcpy(error->error, name);
 397
 398         if (iptables_add_entry(table, entry_head, last, -1) < 0)
 399                 goto err;
 400
 401         /* tail entry */
 402         entry_return_size = sizeof(struct ipt_entry) +
 403                                 sizeof(struct ipt_standard_target);
 404         entry_return = g_try_malloc0(entry_return_size);
 405         if (entry_return == NULL)
 406                 goto err;
 407
 408         memset(entry_return, 0, entry_return_size);
 409
 410         entry_return->target_offset = sizeof(struct ipt_entry);
 411         entry_return->next_offset = entry_return_size;
 412
 413         standard = (struct ipt_standard_target *) entry_return->elems;
 414         standard->target.u.user.target_size =
 415                                 ALIGN(sizeof(struct ipt_standard_target));
 416         standard->verdict = XT_RETURN;
 417
 418         if (iptables_add_entry(table, entry_return, last, -1) < 0)
 419                 goto err;
 420
 421         return 0;
 422
 423 err:
 424         g_free(entry_head);
 425         g_free(entry_return);
 426
 427         return -ENOMEM;
 428 }
 429
 430 static struct ipt_entry *
 431 new_rule(struct connman_iptables *table, struct ipt_ip *ip,
 432                 char *target_name, struct xtables_target *xt_t,
 433                 char *match_name, struct xtables_match *xt_m)
 434 {
 435         struct ipt_entry *new_entry;
 436         size_t match_size, target_size;
 437         int is_builtin = is_builtin_target(target_name);
 438
 439         if (xt_m)
 440                 match_size = xt_m->m->u.match_size;
 441         else
 442                 match_size = 0;
 443
 444         if (xt_t)
 445                 target_size = ALIGN(xt_t->t->u.target_size);
 446         else
 447                 target_size = ALIGN(sizeof(struct xt_standard_target));
 448
 449         new_entry = g_try_malloc0(sizeof(struct ipt_entry) + target_size +
 450                                                                 match_size);
 451         if (new_entry == NULL)
 452                 return NULL;
 453
 454         memcpy(&new_entry->ip, ip, sizeof(struct ipt_ip));
 455
 456         new_entry->target_offset = sizeof(struct ipt_entry) + match_size;
 457         new_entry->next_offset = sizeof(struct ipt_entry) + target_size +
 458                                                                 match_size;
 459         if (xt_m) {
 460                 struct xt_entry_match *entry_match;
 461
 462                 entry_match = (struct xt_entry_match *)new_entry->elems;
 463                 memcpy(entry_match, xt_m->m, match_size);
 464         }
 465
 466         if (xt_t) {
 467                 struct xt_entry_target *entry_target;
 468
 469                 if (is_builtin) {
 470                         struct xt_standard_target *target;
 471
 472                         target = (struct xt_standard_target *)(xt_t->t);
 473                         strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
 474                         target->verdict = target_to_verdict(target_name);
 475                 }
 476
 477                 entry_target = ipt_get_target(new_entry);
 478                 memcpy(entry_target, xt_t->t, target_size);
 479         } else {
 480                 struct connman_iptables_entry *target_rule;
 481                 struct xt_standard_target *target;
 482                 GList *chain_head;
 483
 484                 /*
 485                  * This is a user defined target, i.e. a chain jump.
 486                  * We search for the chain head, and the target verdict
 487                  * is the first rule's offset on this chain.
 488                  * The offset is from the beginning of the table.
 489                  */
 490
 491                 chain_head = find_chain_head(table, target_name);
 492                 if (chain_head == NULL || chain_head->next == NULL) {
 493                         g_free(new_entry);
 494                         return NULL;
 495                 }
 496
 497                 target_rule = chain_head->next->data;
 498
 499                 target = (struct xt_standard_target *)ipt_get_target(new_entry);
 500                 strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
 501                 target->target.u.user.target_size = target_size;
 502                 target->verdict = target_rule->offset;
 503         }
 504
 505         return new_entry;
 506 }
 507
 508 static void update_hooks(struct connman_iptables *table, GList *chain_head,
 509                                 struct ipt_entry *entry)
 510 {
 511         GList *list;
 512         struct connman_iptables_entry *head, *e;
 513         int builtin;
 514
 515         if (chain_head == NULL)
 516                 return;
 517
 518         head = chain_head->data;
 519
 520         builtin = head->builtin;
 521         if (builtin < 0)
 522                 return;
 523
 524         table->underflow[builtin] += entry->next_offset;
 525
 526         for (list = chain_head->next; list; list = list->next) {
 527                 e = list->data;
 528
 529                 builtin = e->builtin;
 530                 if (builtin < 0)
 531                         continue;
 532
 533                 table->hook_entry[builtin] += entry->next_offset;
 534                 table->underflow[builtin] += entry->next_offset;
 535         }
 536 }
 537
 538 static int
 539 iptables_add_rule(struct connman_iptables *table,
 540                                 struct ipt_ip *ip, char *chain_name,
 541                                 char *target_name, struct xtables_target *xt_t,
 542                                 char *match_name, struct xtables_match *xt_m)
 543 {
 544         GList *chain_tail, *chain_head;
 545         struct ipt_entry *new_entry;
 546         struct connman_iptables_entry *head;
 547         int builtin = -1;
 548
 549         DBG("");
 550
 551         chain_head = find_chain_head(table, chain_name);
 552         if (chain_head == NULL)
 553                 return -EINVAL;
 554
 555         chain_tail = find_chain_tail(table, chain_name);
 556         if (chain_tail == NULL)
 557                 return -EINVAL;
 558
 559         new_entry = new_rule(table, ip,
 560                                 target_name, xt_t,
 561                                 match_name, xt_m);
 562         if (new_entry == NULL)
 563                 return -EINVAL;
 564
 565         update_hooks(table, chain_head, new_entry);
 566
 567         /*
 568          * If the chain is builtin, and does not have any rule,
 569          * then the one that we're inserting is becoming the head
 570          * and thus needs the builtin flag.
 571          */
 572         head = chain_head->data;
 573         if (head->builtin < 0)
 574                 builtin = -1;
 575         else if (chain_head == chain_tail->prev) {
 576                 builtin = head->builtin;
 577                 head->builtin = -1;
 578         }
 579
 580         return iptables_add_entry(table, new_entry, chain_tail->prev, builtin);
 581 }
 582
 583 static struct ipt_replace *
 584 iptables_blob(struct connman_iptables *table)
 585 {
 586         struct ipt_replace *r;
 587         GList *list;
 588         struct connman_iptables_entry *e;
 589         unsigned char *entry_index;
 590
 591         r = g_try_malloc0(sizeof(struct ipt_replace) + table->size);
 592         if (r == NULL)
 593                 return NULL;
 594
 595         memset(r, 0, sizeof(*r) + table->size);
 596
 597         r->counters = g_try_malloc0(sizeof(struct xt_counters)
 598                                 * table->num_entries);
 599         if (r->counters == NULL) {
 600                 g_free(r);
 601                 return NULL;
 602         }
 603
 604         strcpy(r->name, table->info->name);
 605         r->num_entries = table->num_entries;
 606         r->size = table->size;
 607
 608         r->num_counters = table->old_entries;
 609         r->valid_hooks  = table->info->valid_hooks;
 610
 611         memcpy(r->hook_entry, table->hook_entry, sizeof(table->hook_entry));
 612         memcpy(r->underflow, table->underflow, sizeof(table->underflow));
 613
 614         entry_index = (unsigned char *)r->entries;
 615         for (list = table->entries; list; list = list->next) {
 616                 e = list->data;
 617
 618                 memcpy(entry_index, e->entry, e->entry->next_offset);
 619                 entry_index += e->entry->next_offset;
 620         }
 621
 622         return r;
 623 }
 624
 625 static void dump_ip(struct ipt_entry *entry)
 626 {
 627         struct ipt_ip *ip = &entry->ip;
 628         char ip_string[INET6_ADDRSTRLEN];
 629         char ip_mask[INET6_ADDRSTRLEN];
 630
 631         if (strlen(ip->iniface))
 632                 connman_info("\tin %s", ip->iniface);
 633
 634         if (strlen(ip->outiface))
 635                 connman_info("\tout %s", ip->outiface);
 636
 637         if (inet_ntop(AF_INET, &ip->src, ip_string, INET6_ADDRSTRLEN) != NULL &&
 638                         inet_ntop(AF_INET, &ip->smsk,
 639                                         ip_mask, INET6_ADDRSTRLEN) != NULL)
 640                 connman_info("\tsrc %s/%s", ip_string, ip_mask);
 641
 642         if (inet_ntop(AF_INET, &ip->dst, ip_string, INET6_ADDRSTRLEN) != NULL &&
 643                         inet_ntop(AF_INET, &ip->dmsk,
 644                                         ip_mask, INET6_ADDRSTRLEN) != NULL)
 645                 connman_info("\tdst %s/%s", ip_string, ip_mask);
 646 }
 647
 648 static void dump_target(struct connman_iptables *table,
 649                                 struct ipt_entry *entry)
 650
 651 {
 652         struct xtables_target *xt_t;
 653         struct xt_entry_target *target;
 654
 655         target = ipt_get_target(entry);
 656
 657         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
 658                 struct xt_standard_target *t;
 659
 660                 t = (struct xt_standard_target *)target;
 661
 662                 switch (t->verdict) {
 663                 case XT_RETURN:
 664                         connman_info("\ttarget RETURN");
 665                         break;
 666
 667                 case -NF_ACCEPT - 1:
 668                         connman_info("\ttarget ACCEPT");
 669                         break;
 670
 671                 case -NF_DROP - 1:
 672                         connman_info("\ttarget DROP");
 673                         break;
 674
 675                 case -NF_QUEUE - 1:
 676                         connman_info("\ttarget QUEUE");
 677                         break;
 678
 679                 case -NF_STOP - 1:
 680                         connman_info("\ttarget STOP");
 681                         break;
 682
 683                 default:
 684                         connman_info("\tJUMP @%p (0x%x)",
 685                                 (char*)table->blob_entries->entrytable +
 686                                 t->verdict, t->verdict);
 687                         break;
 688                 }
 689
 690                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
 691                                                 XTF_LOAD_MUST_SUCCEED);
 692
 693                 if(xt_t->print != NULL)
 694                         xt_t->print(NULL, target, 1);
 695         } else {
 696                 xt_t = xtables_find_target(target->u.user.name, XTF_TRY_LOAD);
 697                 if (xt_t == NULL) {
 698                         connman_info("\ttarget %s", target->u.user.name);
 699                         return;
 700                 }
 701
 702                 if(xt_t->print != NULL) {
 703                         connman_info("\ttarget ");
 704                         xt_t->print(NULL, target, 1);
 705                 }
 706         }
 707 }
 708
 709 static void dump_match(struct connman_iptables *table, struct ipt_entry *entry)
 710 {
 711         struct xtables_match *xt_m;
 712         struct xt_entry_match *match;
 713
 714         if (entry->elems == (unsigned char *)entry + entry->target_offset)
 715                 return;
 716
 717         match = (struct xt_entry_match *) entry->elems;
 718
 719         if (!strlen(match->u.user.name))
 720                 return;
 721
 722         xt_m = xtables_find_match(match->u.user.name, XTF_TRY_LOAD, NULL);
 723         if (xt_m == NULL)
 724                 goto out;
 725
 726         if(xt_m->print != NULL) {
 727                 connman_info("\tmatch ");
 728                 xt_m->print(NULL, match, 1);
 729
 730                 return;
 731         }
 732
 733 out:
 734         connman_info("\tmatch %s", match->u.user.name);
 735
 736 }
 737
 738 static int dump_entry(struct ipt_entry *entry,
 739                                 struct connman_iptables *table)
 740 {
 741         struct xt_entry_target *target;
 742         unsigned int offset;
 743         int builtin;
 744
 745         offset = (char *)entry - (char *)table->blob_entries->entrytable;
 746         target = ipt_get_target(entry);
 747         builtin = is_hook_entry(table, entry);
 748
 749         if (entry_to_offset(table, entry) + entry->next_offset ==
 750                                         table->blob_entries->size) {
 751                 connman_info("End of CHAIN 0x%x", offset);
 752                 return 0;
 753         }
 754
 755         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET)) {
 756                 connman_info("USER CHAIN (%s) %p  match %p  target %p  size %d",
 757                         target->data, entry, entry->elems,
 758                         (char *)entry + entry->target_offset,
 759                                 entry->next_offset);
 760
 761                 return 0;
 762         } else if (builtin >= 0) {
 763                 connman_info("CHAIN (%s) %p  match %p  target %p  size %d",
 764                         hooknames[builtin], entry, entry->elems,
 765                         (char *)entry + entry->target_offset,
 766                                 entry->next_offset);
 767         } else {
 768                 connman_info("RULE %p  match %p  target %p  size %d", entry,
 769                         entry->elems,
 770                         (char *)entry + entry->target_offset,
 771                                 entry->next_offset);
 772         }
 773
 774         dump_match(table, entry);
 775         dump_target(table, entry);
 776         dump_ip(entry);
 777
 778         return 0;
 779 }
 780
 781 static void iptables_dump(struct connman_iptables *table)
 782 {
 783         connman_info("%s valid_hooks=0x%08x, num_entries=%u, size=%u",
 784                         table->info->name,
 785                         table->info->valid_hooks, table->info->num_entries,
 786                                 table->info->size);
 787
 788         ENTRY_ITERATE(table->blob_entries->entrytable,
 789                         table->blob_entries->size,
 790                         dump_entry, table);
 791
 792 }
 793
 794 static int iptables_get_entries(struct connman_iptables *table)
 795 {
 796         socklen_t entry_size;
 797
 798         entry_size = sizeof(struct ipt_get_entries) + table->info->size;
 799
 800         return getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_ENTRIES,
 801                                 table->blob_entries, &entry_size);
 802 }
 803
 804 static int iptables_replace(struct connman_iptables *table,
 805                                         struct ipt_replace *r)
 806 {
 807         return setsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_SET_REPLACE, r,
 808                          sizeof(*r) + r->size);
 809 }
 810
 811 static int add_entry(struct ipt_entry *entry, struct connman_iptables *table)
 812 {
 813         struct ipt_entry *new_entry;
 814         int builtin;
 815
 816         new_entry = g_try_malloc0(entry->next_offset);
 817         if (new_entry == NULL)
 818                 return -ENOMEM;
 819
 820         memcpy(new_entry, entry, entry->next_offset);
 821
 822         builtin = is_hook_entry(table, entry);
 823
 824         return iptables_add_entry(table, new_entry, NULL, builtin);
 825 }
 826
 827 static void table_cleanup(struct connman_iptables *table)
 828 {
 829         GList *list;
 830         struct connman_iptables_entry *entry;
 831
 832         close(table->ipt_sock);
 833
 834         for (list = table->entries; list; list = list->next) {
 835                 entry = list->data;
 836
 837                 g_free(entry->entry);
 838         }
 839
 840         g_list_free(table->entries);
 841         g_free(table->info);
 842         g_free(table->blob_entries);
 843         g_free(table);
 844 }
 845
 846 static struct connman_iptables *iptables_init(char *table_name)
 847 {
 848         struct connman_iptables *table;
 849         socklen_t s;
 850
 851         DBG("%s", table_name);
 852
 853         table = g_hash_table_lookup(table_hash, table_name);
 854         if (table != NULL)
 855                 return table;
 856
 857         table = g_try_new0(struct connman_iptables, 1);
 858         if (table == NULL)
 859                 return NULL;
 860
 861         table->info = g_try_new0(struct ipt_getinfo, 1);
 862         if (table->info == NULL)
 863                 goto err;
 864
 865         table->ipt_sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
 866         if (table->ipt_sock < 0)
 867                 goto err;
 868
 869         s = sizeof(*table->info);
 870         strcpy(table->info->name, table_name);
 871         if (getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_INFO,
 872                                                 table->info, &s) < 0)
 873                 goto err;
 874
 875         table->blob_entries = g_try_malloc0(sizeof(struct ipt_get_entries) +
 876                                                 table->info->size);
 877         if (table->blob_entries == NULL)
 878                 goto err;
 879
 880         strcpy(table->blob_entries->name, table_name);
 881         table->blob_entries->size = table->info->size;
 882
 883         if (iptables_get_entries(table) < 0)
 884                 goto err;
 885
 886         table->num_entries = 0;
 887         table->old_entries = table->info->num_entries;
 888         table->size = 0;
 889
 890         memcpy(table->underflow, table->info->underflow,
 891                                 sizeof(table->info->underflow));
 892         memcpy(table->hook_entry, table->info->hook_entry,
 893                                 sizeof(table->info->hook_entry));
 894
 895         ENTRY_ITERATE(table->blob_entries->entrytable,
 896                         table->blob_entries->size,
 897                                 add_entry, table);
 898
 899         g_hash_table_insert(table_hash, g_strdup(table_name), table);
 900
 901         return table;
 902
 903 err:
 904
 905         table_cleanup(table);
 906
 907         return NULL;
 908 }
 909
 910 static struct option iptables_opts[] = {
 911         {.name = "append",        .has_arg = 1, .val = 'A'},
 912         {.name = "list",          .has_arg = 2, .val = 'L'},
 913         {.name = "new-chain",     .has_arg = 1, .val = 'N'},
 914         {.name = "destination",   .has_arg = 1, .val = 'd'},
 915         {.name = "in-interface",  .has_arg = 1, .val = 'i'},
 916         {.name = "jump",          .has_arg = 1, .val = 'j'},
 917         {.name = "match",         .has_arg = 1, .val = 'm'},
 918         {.name = "out-interface", .has_arg = 1, .val = 'o'},
 919         {.name = "source",        .has_arg = 1, .val = 's'},
 920         {.name = "table",         .has_arg = 1, .val = 't'},
 921         {NULL},
 922 };
 923
 924 struct xtables_globals iptables_globals = {
 925         .option_offset = 0,
 926         .opts = iptables_opts,
 927         .orig_opts = iptables_opts,
 928 };
 929
 930 static int iptables_command(int argc, char *argv[])
 931 {
 932         struct connman_iptables *table;
 933         struct xtables_match *xt_m;
 934         struct xtables_target *xt_t;
 935         struct ipt_ip ip;
 936         char *table_name, *chain, *new_chain, *match_name, *target_name;
 937         int c, ret, in_len, out_len;
 938         size_t size;
 939         gboolean dump, invert;
 940         struct in_addr src, dst;
 941
 942         if (argc == 0)
 943                 return -EINVAL;
 944
 945         dump = FALSE;
 946         invert = FALSE;
 947         table_name = chain = new_chain = match_name = target_name = NULL;
 948         memset(&ip, 0, sizeof(struct ipt_ip));
 949         table = NULL;
 950         xt_m = NULL;
 951         xt_t = NULL;
 952         ret = 0;
 953
 954         optind = 0;
 955
 956         while ((c = getopt_long(argc, argv,
 957            "-A:L::N:d:j:i:m:o:s:t:", iptables_globals.opts, NULL)) != -1) {
 958                 switch (c) {
 959                 case 'A':
 960                         chain = optarg;
 961                         break;
 962
 963                 case 'L':
 964                         dump = TRUE;
 965                         break;
 966
 967                 case 'N':
 968                         new_chain = optarg;
 969                         break;
 970
 971                 case 'd':
 972                         if (!inet_pton(AF_INET, optarg, &dst))
 973                                 break;
 974
 975                         ip.dst = dst;
 976                         inet_pton(AF_INET, "255.255.255.255", &ip.dmsk);
 977
 978                         if (invert)
 979                                 ip.invflags |= IPT_INV_DSTIP;
 980
 981                         break;
 982
 983                 case 'i':
 984                         in_len = strlen(optarg);
 985
 986                         if (in_len + 1 > IFNAMSIZ)
 987                                 break;
 988
 989                         strcpy(ip.iniface, optarg);
 990                         memset(ip.iniface_mask, 0xff, in_len + 1);
 991
 992                         if (invert)
 993                                 ip.invflags |= IPT_INV_VIA_IN;
 994
 995                         break;
 996
 997                 case 'j':
 998                         target_name = optarg;
 999                         xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
1000
1001                         if (xt_t == NULL)
1002                                 break;
1003
1004                         size = ALIGN(sizeof(struct ipt_entry_target)) +
1005                                                                 xt_t->size;
1006
1007                         xt_t->t = g_try_malloc0(size);
1008                         if (xt_t->t == NULL)
1009                                 goto out;
1010                         xt_t->t->u.target_size = size;
1011                         strcpy(xt_t->t->u.user.name, target_name);
1012                         xt_t->t->u.user.revision = xt_t->revision;
1013                         if (xt_t->init != NULL)
1014                                 xt_t->init(xt_t->t);
1015                         iptables_globals.opts =
1016                                 xtables_merge_options(iptables_globals.opts,
1017                                                      xt_t->extra_opts,
1018                                                      &xt_t->option_offset);
1019                         if (iptables_globals.opts == NULL)
1020                                 goto out;
1021
1022                         break;
1023
1024                 case 'm':
1025                         match_name = optarg;
1026
1027                         xt_m = xtables_find_match(optarg, XTF_LOAD_MUST_SUCCEED, NULL);
1028                         size = ALIGN(sizeof(struct ipt_entry_match)) +
1029                                                                 xt_m->size;
1030                         xt_m->m = g_try_malloc0(size);
1031                         if (xt_m == NULL)
1032                                 goto out;
1033                         xt_m->m->u.match_size = size;
1034                         strcpy(xt_m->m->u.user.name, xt_m->name);
1035                         xt_m->m->u.user.revision = xt_m->revision;
1036                         if (xt_m->init != NULL)
1037                                 xt_m->init(xt_m->m);
1038                         if (xt_m != xt_m->next) {
1039                                 iptables_globals.opts =
1040                                 xtables_merge_options(iptables_globals.opts,
1041                                                 xt_m->extra_opts,
1042                                                 &xt_m->option_offset);
1043                                 if (iptables_globals.opts == NULL)
1044                                         goto out;
1045                         }
1046
1047                         break;
1048
1049                 case 'o':
1050                         out_len = strlen(optarg);
1051
1052                         if (out_len + 1 > IFNAMSIZ)
1053                                 break;
1054
1055                         strcpy(ip.outiface, optarg);
1056                         memset(ip.outiface_mask, 0xff, out_len + 1);
1057
1058                         if (invert)
1059                                 ip.invflags |= IPT_INV_VIA_OUT;
1060
1061                         break;
1062
1063                 case 's':
1064                         if (!inet_pton(AF_INET, optarg, &src))
1065                                 break;
1066
1067                         ip.src = src;
1068                         inet_pton(AF_INET, "255.255.255.255", &ip.smsk);
1069
1070                         if (invert)
1071                                 ip.invflags |= IPT_INV_SRCIP;
1072
1073                         break;
1074
1075                 case 't':
1076                         table_name = optarg;
1077                         break;
1078
1079                 case 1:
1080                         if (optarg[0] == '!' && optarg[1] == '\0') {
1081                                 invert = TRUE;
1082                                 optarg[0] = '\0';
1083                                 continue;
1084                         }
1085
1086                         connman_error("Invalid option");
1087
1088                         ret = -EINVAL;
1089                         goto out;
1090
1091                 default:
1092                         if (xt_t == NULL || xt_t->parse == NULL ||
1093                             !xt_t->parse(c - xt_t->option_offset, argv, invert,
1094                                         &xt_t->tflags, NULL, &xt_t->t)) {
1095                                 if (xt_m == NULL || xt_m->parse == NULL)
1096                                         break;
1097
1098                                 xt_m->parse(c - xt_m->option_offset, argv,
1099                                         invert, &xt_m->mflags, NULL, &xt_m->m);
1100                         }
1101
1102                         break;
1103                 }
1104
1105                 invert = FALSE;
1106         }
1107
1108         if (table_name == NULL)
1109                 table_name = "filter";
1110
1111         table = iptables_init(table_name);
1112         if (table == NULL) {
1113                 ret = -EINVAL;
1114                 goto out;
1115         }
1116
1117         if (dump) {
1118                 iptables_dump(table);
1119
1120                 ret = 0;
1121                 goto out;
1122         }
1123
1124         if (chain && new_chain) {
1125                 ret = -EINVAL;
1126                 goto out;
1127         }
1128
1129         if (new_chain) {
1130                 DBG("New chain %s", new_chain);
1131
1132                 ret = iptables_add_chain(table, new_chain);
1133                 goto out;
1134         }
1135
1136         if (chain) {
1137                 if (target_name == NULL)
1138                         return -1;
1139
1140                 DBG("Adding %s to %s (match %s)",
1141                                 target_name, chain, match_name);
1142
1143                 ret = iptables_add_rule(table, &ip, chain, target_name, xt_t,
1144                                         match_name, xt_m);
1145
1146                 goto out;
1147         }
1148
1149 out:
1150         if (xt_t)
1151                 g_free(xt_t->t);
1152
1153         if (xt_m)
1154                 g_free(xt_m->m);
1155
1156         return ret;
1157 }
1158
1159 int __connman_iptables_command(const char *format, ...)
1160 {
1161         char **argv, **arguments, *command;
1162         int argc, i, ret;
1163         va_list args;
1164
1165         if (format == NULL)
1166                 return -EINVAL;
1167
1168         va_start(args, format);
1169
1170         command = g_strdup_vprintf(format, args);
1171
1172         va_end(args);
1173
1174         if (command == NULL)
1175                 return -ENOMEM;
1176
1177         arguments = g_strsplit_set(command, " ", -1);
1178
1179         for (argc = 0; arguments[argc]; argc++);
1180
1181         DBG("command %s argc %d", command, ++argc);
1182
1183         argv = g_try_malloc0(argc * sizeof(char *));
1184         if (argv == NULL) {
1185                 g_free(command);
1186                 g_strfreev(arguments);
1187                 return -ENOMEM;
1188         }
1189
1190         argv[0] = "iptables";
1191         for (i = 1; i < argc; i++)
1192                 argv[i] = arguments[i - 1];
1193
1194         ret = iptables_command(argc, argv);
1195
1196         g_free(command);
1197         g_strfreev(arguments);
1198         g_free(argv);
1199
1200         return ret;
1201 }
1202
1203
1204 int __connman_iptables_commit(const char *table_name)
1205 {
1206         struct connman_iptables *table;
1207         struct ipt_replace *repl;
1208
1209         DBG("%s", table_name);
1210
1211         table = g_hash_table_lookup(table_hash, table_name);
1212         if (table == NULL)
1213                 return -EINVAL;
1214
1215         repl = iptables_blob(table);
1216
1217         return iptables_replace(table, repl);
1218 }
1219
1220 static void remove_table(gpointer user_data)
1221 {
1222         struct connman_iptables *table = user_data;
1223
1224         table_cleanup(table);
1225 }
1226
1227 int __connman_iptables_init(void)
1228 {
1229         DBG("");
1230
1231         table_hash = g_hash_table_new_full(g_str_hash, g_str_equal,
1232                                                 g_free, remove_table);
1233
1234         xtables_init_all(&iptables_globals, NFPROTO_IPV4);
1235
1236         return 0;
1237
1238 }
1239
1240 void __connman_iptables_cleanup(void)
1241 {
1242         g_hash_table_destroy(table_hash);
1243
1244         xtables_free_opts(1);
1245 }