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 insterted a new entry. All references before it
 319          * should be bumped accordingly.
 320          */
 321         for (list = table->entries; list != before; 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 struct ipt_entry *
 487 new_rule(struct connman_iptables *table, struct ipt_ip *ip,
 488                 char *target_name, struct xtables_target *xt_t,
 489                 char *match_name, struct xtables_match *xt_m)
 490 {
 491         struct ipt_entry *new_entry;
 492         size_t match_size, target_size;
 493         int is_builtin = is_builtin_target(target_name);
 494
 495         if (xt_m)
 496                 match_size = xt_m->m->u.match_size;
 497         else
 498                 match_size = 0;
 499
 500         if (xt_t)
 501                 target_size = ALIGN(xt_t->t->u.target_size);
 502         else
 503                 target_size = ALIGN(sizeof(struct xt_standard_target));
 504
 505         new_entry = g_try_malloc0(sizeof(struct ipt_entry) + target_size +
 506                                                                 match_size);
 507         if (new_entry == NULL)
 508                 return NULL;
 509
 510         memcpy(&new_entry->ip, ip, sizeof(struct ipt_ip));
 511
 512         new_entry->target_offset = sizeof(struct ipt_entry) + match_size;
 513         new_entry->next_offset = sizeof(struct ipt_entry) + target_size +
 514                                                                 match_size;
 515         if (xt_m) {
 516                 struct xt_entry_match *entry_match;
 517
 518                 entry_match = (struct xt_entry_match *)new_entry->elems;
 519                 memcpy(entry_match, xt_m->m, match_size);
 520         }
 521
 522         if (xt_t) {
 523                 struct xt_entry_target *entry_target;
 524
 525                 if (is_builtin) {
 526                         struct xt_standard_target *target;
 527
 528                         target = (struct xt_standard_target *)(xt_t->t);
 529                         strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
 530                         target->verdict = target_to_verdict(target_name);
 531                 }
 532
 533                 entry_target = ipt_get_target(new_entry);
 534                 memcpy(entry_target, xt_t->t, target_size);
 535         } else {
 536                 struct connman_iptables_entry *target_rule;
 537                 struct xt_standard_target *target;
 538                 GList *chain_head;
 539
 540                 /*
 541                  * This is a user defined target, i.e. a chain jump.
 542                  * We search for the chain head, and the target verdict
 543                  * is the first rule's offset on this chain.
 544                  * The offset is from the beginning of the table.
 545                  */
 546
 547                 chain_head = find_chain_head(table, target_name);
 548                 if (chain_head == NULL || chain_head->next == NULL) {
 549                         g_free(new_entry);
 550                         return NULL;
 551                 }
 552
 553                 target_rule = chain_head->next->data;
 554
 555                 target = (struct xt_standard_target *)ipt_get_target(new_entry);
 556                 strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
 557                 target->target.u.user.target_size = target_size;
 558                 target->verdict = target_rule->offset;
 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 int
 595 iptables_add_rule(struct connman_iptables *table,
 596                                 struct ipt_ip *ip, char *chain_name,
 597                                 char *target_name, struct xtables_target *xt_t,
 598                                 char *match_name, struct xtables_match *xt_m)
 599 {
 600         GList *chain_tail, *chain_head;
 601         struct ipt_entry *new_entry;
 602         struct connman_iptables_entry *head;
 603         int builtin = -1;
 604
 605         DBG("");
 606
 607         chain_head = find_chain_head(table, chain_name);
 608         if (chain_head == NULL)
 609                 return -EINVAL;
 610
 611         chain_tail = find_chain_tail(table, chain_name);
 612         if (chain_tail == NULL)
 613                 return -EINVAL;
 614
 615         new_entry = new_rule(table, ip,
 616                                 target_name, xt_t,
 617                                 match_name, xt_m);
 618         if (new_entry == NULL)
 619                 return -EINVAL;
 620
 621         update_hooks(table, chain_head, new_entry);
 622
 623         /*
 624          * If the chain is builtin, and does not have any rule,
 625          * then the one that we're inserting is becoming the head
 626          * and thus needs the builtin flag.
 627          */
 628         head = chain_head->data;
 629         if (head->builtin < 0)
 630                 builtin = -1;
 631         else if (chain_head == chain_tail->prev) {
 632                 builtin = head->builtin;
 633                 head->builtin = -1;
 634         }
 635
 636         return iptables_add_entry(table, new_entry, chain_tail->prev, builtin);
 637 }
 638
 639 static struct ipt_replace *
 640 iptables_blob(struct connman_iptables *table)
 641 {
 642         struct ipt_replace *r;
 643         GList *list;
 644         struct connman_iptables_entry *e;
 645         unsigned char *entry_index;
 646
 647         r = g_try_malloc0(sizeof(struct ipt_replace) + table->size);
 648         if (r == NULL)
 649                 return NULL;
 650
 651         memset(r, 0, sizeof(*r) + table->size);
 652
 653         r->counters = g_try_malloc0(sizeof(struct xt_counters)
 654                                 * table->old_entries);
 655         if (r->counters == NULL) {
 656                 g_free(r);
 657                 return NULL;
 658         }
 659
 660         strcpy(r->name, table->info->name);
 661         r->num_entries = table->num_entries;
 662         r->size = table->size;
 663
 664         r->num_counters = table->old_entries;
 665         r->valid_hooks  = table->info->valid_hooks;
 666
 667         memcpy(r->hook_entry, table->hook_entry, sizeof(table->hook_entry));
 668         memcpy(r->underflow, table->underflow, sizeof(table->underflow));
 669
 670         entry_index = (unsigned char *)r->entries;
 671         for (list = table->entries; list; list = list->next) {
 672                 e = list->data;
 673
 674                 memcpy(entry_index, e->entry, e->entry->next_offset);
 675                 entry_index += e->entry->next_offset;
 676         }
 677
 678         return r;
 679 }
 680
 681 static void dump_ip(struct ipt_entry *entry)
 682 {
 683         struct ipt_ip *ip = &entry->ip;
 684         char ip_string[INET6_ADDRSTRLEN];
 685         char ip_mask[INET6_ADDRSTRLEN];
 686
 687         if (strlen(ip->iniface))
 688                 connman_info("\tin %s", ip->iniface);
 689
 690         if (strlen(ip->outiface))
 691                 connman_info("\tout %s", ip->outiface);
 692
 693         if (inet_ntop(AF_INET, &ip->src, ip_string, INET6_ADDRSTRLEN) != NULL &&
 694                         inet_ntop(AF_INET, &ip->smsk,
 695                                         ip_mask, INET6_ADDRSTRLEN) != NULL)
 696                 connman_info("\tsrc %s/%s", ip_string, ip_mask);
 697
 698         if (inet_ntop(AF_INET, &ip->dst, ip_string, INET6_ADDRSTRLEN) != NULL &&
 699                         inet_ntop(AF_INET, &ip->dmsk,
 700                                         ip_mask, INET6_ADDRSTRLEN) != NULL)
 701                 connman_info("\tdst %s/%s", ip_string, ip_mask);
 702 }
 703
 704 static void dump_target(struct connman_iptables *table,
 705                                 struct ipt_entry *entry)
 706
 707 {
 708         struct xtables_target *xt_t;
 709         struct xt_entry_target *target;
 710
 711         target = ipt_get_target(entry);
 712
 713         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
 714                 struct xt_standard_target *t;
 715
 716                 t = (struct xt_standard_target *)target;
 717
 718                 switch (t->verdict) {
 719                 case XT_RETURN:
 720                         connman_info("\ttarget RETURN");
 721                         break;
 722
 723                 case -NF_ACCEPT - 1:
 724                         connman_info("\ttarget ACCEPT");
 725                         break;
 726
 727                 case -NF_DROP - 1:
 728                         connman_info("\ttarget DROP");
 729                         break;
 730
 731                 case -NF_QUEUE - 1:
 732                         connman_info("\ttarget QUEUE");
 733                         break;
 734
 735                 case -NF_STOP - 1:
 736                         connman_info("\ttarget STOP");
 737                         break;
 738
 739                 default:
 740                         connman_info("\tJUMP @%p (0x%x)",
 741                                 (char*)table->blob_entries->entrytable +
 742                                 t->verdict, t->verdict);
 743                         break;
 744                 }
 745
 746                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
 747                                                 XTF_LOAD_MUST_SUCCEED);
 748
 749                 if(xt_t->print != NULL)
 750                         xt_t->print(NULL, target, 1);
 751         } else {
 752                 xt_t = xtables_find_target(target->u.user.name, XTF_TRY_LOAD);
 753                 if (xt_t == NULL) {
 754                         connman_info("\ttarget %s", target->u.user.name);
 755                         return;
 756                 }
 757
 758                 if(xt_t->print != NULL) {
 759                         connman_info("\ttarget ");
 760                         xt_t->print(NULL, target, 1);
 761                 }
 762         }
 763 }
 764
 765 static void dump_match(struct connman_iptables *table, struct ipt_entry *entry)
 766 {
 767         struct xtables_match *xt_m;
 768         struct xt_entry_match *match;
 769
 770         if (entry->elems == (unsigned char *)entry + entry->target_offset)
 771                 return;
 772
 773         match = (struct xt_entry_match *) entry->elems;
 774
 775         if (!strlen(match->u.user.name))
 776                 return;
 777
 778         xt_m = xtables_find_match(match->u.user.name, XTF_TRY_LOAD, NULL);
 779         if (xt_m == NULL)
 780                 goto out;
 781
 782         if(xt_m->print != NULL) {
 783                 connman_info("\tmatch ");
 784                 xt_m->print(NULL, match, 1);
 785
 786                 return;
 787         }
 788
 789 out:
 790         connman_info("\tmatch %s", match->u.user.name);
 791
 792 }
 793
 794 static int dump_entry(struct ipt_entry *entry,
 795                                 struct connman_iptables *table)
 796 {
 797         struct xt_entry_target *target;
 798         unsigned int offset;
 799         int builtin;
 800
 801         offset = (char *)entry - (char *)table->blob_entries->entrytable;
 802         target = ipt_get_target(entry);
 803         builtin = is_hook_entry(table, entry);
 804
 805         if (entry_to_offset(table, entry) + entry->next_offset ==
 806                                         table->blob_entries->size) {
 807                 connman_info("End of CHAIN 0x%x", offset);
 808                 return 0;
 809         }
 810
 811         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET)) {
 812                 connman_info("USER CHAIN (%s) %p  match %p  target %p  size %d",
 813                         target->data, entry, entry->elems,
 814                         (char *)entry + entry->target_offset,
 815                                 entry->next_offset);
 816
 817                 return 0;
 818         } else if (builtin >= 0) {
 819                 connman_info("CHAIN (%s) %p  match %p  target %p  size %d",
 820                         hooknames[builtin], entry, entry->elems,
 821                         (char *)entry + entry->target_offset,
 822                                 entry->next_offset);
 823         } else {
 824                 connman_info("RULE %p  match %p  target %p  size %d", entry,
 825                         entry->elems,
 826                         (char *)entry + entry->target_offset,
 827                                 entry->next_offset);
 828         }
 829
 830         dump_match(table, entry);
 831         dump_target(table, entry);
 832         dump_ip(entry);
 833
 834         return 0;
 835 }
 836
 837 static void iptables_dump(struct connman_iptables *table)
 838 {
 839         connman_info("%s valid_hooks=0x%08x, num_entries=%u, size=%u",
 840                         table->info->name,
 841                         table->info->valid_hooks, table->info->num_entries,
 842                                 table->info->size);
 843
 844         ENTRY_ITERATE(table->blob_entries->entrytable,
 845                         table->blob_entries->size,
 846                         dump_entry, table);
 847
 848 }
 849
 850 static int iptables_get_entries(struct connman_iptables *table)
 851 {
 852         socklen_t entry_size;
 853
 854         entry_size = sizeof(struct ipt_get_entries) + table->info->size;
 855
 856         return getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_ENTRIES,
 857                                 table->blob_entries, &entry_size);
 858 }
 859
 860 static int iptables_replace(struct connman_iptables *table,
 861                                         struct ipt_replace *r)
 862 {
 863         return setsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_SET_REPLACE, r,
 864                          sizeof(*r) + r->size);
 865 }
 866
 867 static int add_entry(struct ipt_entry *entry, struct connman_iptables *table)
 868 {
 869         struct ipt_entry *new_entry;
 870         int builtin;
 871
 872         new_entry = g_try_malloc0(entry->next_offset);
 873         if (new_entry == NULL)
 874                 return -ENOMEM;
 875
 876         memcpy(new_entry, entry, entry->next_offset);
 877
 878         builtin = is_hook_entry(table, entry);
 879
 880         return iptables_add_entry(table, new_entry, NULL, builtin);
 881 }
 882
 883 static void table_cleanup(struct connman_iptables *table)
 884 {
 885         GList *list;
 886         struct connman_iptables_entry *entry;
 887
 888         close(table->ipt_sock);
 889
 890         for (list = table->entries; list; list = list->next) {
 891                 entry = list->data;
 892
 893                 g_free(entry->entry);
 894                 g_free(entry);
 895         }
 896
 897         g_list_free(table->entries);
 898         g_free(table->info);
 899         g_free(table->blob_entries);
 900         g_free(table);
 901 }
 902
 903 static struct connman_iptables *iptables_init(char *table_name)
 904 {
 905         struct connman_iptables *table;
 906         socklen_t s;
 907
 908         DBG("%s", table_name);
 909
 910         table = g_hash_table_lookup(table_hash, table_name);
 911         if (table != NULL)
 912                 return table;
 913
 914         table = g_try_new0(struct connman_iptables, 1);
 915         if (table == NULL)
 916                 return NULL;
 917
 918         table->info = g_try_new0(struct ipt_getinfo, 1);
 919         if (table->info == NULL)
 920                 goto err;
 921
 922         table->ipt_sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
 923         if (table->ipt_sock < 0)
 924                 goto err;
 925
 926         s = sizeof(*table->info);
 927         strcpy(table->info->name, table_name);
 928         if (getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_INFO,
 929                                                 table->info, &s) < 0)
 930                 goto err;
 931
 932         table->blob_entries = g_try_malloc0(sizeof(struct ipt_get_entries) +
 933                                                 table->info->size);
 934         if (table->blob_entries == NULL)
 935                 goto err;
 936
 937         strcpy(table->blob_entries->name, table_name);
 938         table->blob_entries->size = table->info->size;
 939
 940         if (iptables_get_entries(table) < 0)
 941                 goto err;
 942
 943         table->num_entries = 0;
 944         table->old_entries = table->info->num_entries;
 945         table->size = 0;
 946
 947         memcpy(table->underflow, table->info->underflow,
 948                                 sizeof(table->info->underflow));
 949         memcpy(table->hook_entry, table->info->hook_entry,
 950                                 sizeof(table->info->hook_entry));
 951
 952         ENTRY_ITERATE(table->blob_entries->entrytable,
 953                         table->blob_entries->size,
 954                                 add_entry, table);
 955
 956         g_hash_table_insert(table_hash, g_strdup(table_name), table);
 957
 958         return table;
 959
 960 err:
 961
 962         table_cleanup(table);
 963
 964         return NULL;
 965 }
 966
 967 static struct option iptables_opts[] = {
 968         {.name = "append",        .has_arg = 1, .val = 'A'},
 969         {.name = "flush-chain",   .has_arg = 1, .val = 'F'},
 970         {.name = "list",          .has_arg = 2, .val = 'L'},
 971         {.name = "new-chain",     .has_arg = 1, .val = 'N'},
 972         {.name = "destination",   .has_arg = 1, .val = 'd'},
 973         {.name = "in-interface",  .has_arg = 1, .val = 'i'},
 974         {.name = "jump",          .has_arg = 1, .val = 'j'},
 975         {.name = "match",         .has_arg = 1, .val = 'm'},
 976         {.name = "out-interface", .has_arg = 1, .val = 'o'},
 977         {.name = "source",        .has_arg = 1, .val = 's'},
 978         {.name = "table",         .has_arg = 1, .val = 't'},
 979         {NULL},
 980 };
 981
 982 struct xtables_globals iptables_globals = {
 983         .option_offset = 0,
 984         .opts = iptables_opts,
 985         .orig_opts = iptables_opts,
 986 };
 987
 988 static int iptables_command(int argc, char *argv[])
 989 {
 990         struct connman_iptables *table;
 991         struct xtables_match *xt_m;
 992         struct xtables_target *xt_t;
 993         struct ipt_ip ip;
 994         char *table_name, *chain, *new_chain, *match_name, *target_name;
 995         char *flush_chain;
 996         int c, ret, in_len, out_len;
 997         size_t size;
 998         gboolean dump, invert;
 999         struct in_addr src, dst;
1000
1001         if (argc == 0)
1002                 return -EINVAL;
1003
1004         dump = FALSE;
1005         invert = FALSE;
1006         table_name = chain = new_chain = match_name = target_name = NULL;
1007         flush_chain = NULL;
1008         memset(&ip, 0, sizeof(struct ipt_ip));
1009         table = NULL;
1010         xt_m = NULL;
1011         xt_t = NULL;
1012         ret = 0;
1013
1014         optind = 0;
1015
1016         while ((c = getopt_long(argc, argv,
1017            "-A:F:L::N:d:j:i:m:o:s:t:", iptables_globals.opts, NULL)) != -1) {
1018                 switch (c) {
1019                 case 'A':
1020                         chain = optarg;
1021                         break;
1022
1023                 case 'F':
1024                         flush_chain = optarg;
1025                         break;
1026
1027                 case 'L':
1028                         dump = TRUE;
1029                         break;
1030
1031                 case 'N':
1032                         new_chain = optarg;
1033                         break;
1034
1035                 case 'd':
1036                         if (!inet_pton(AF_INET, optarg, &dst))
1037                                 break;
1038
1039                         ip.dst = dst;
1040                         inet_pton(AF_INET, "255.255.255.255", &ip.dmsk);
1041
1042                         if (invert)
1043                                 ip.invflags |= IPT_INV_DSTIP;
1044
1045                         break;
1046
1047                 case 'i':
1048                         in_len = strlen(optarg);
1049
1050                         if (in_len + 1 > IFNAMSIZ)
1051                                 break;
1052
1053                         strcpy(ip.iniface, optarg);
1054                         memset(ip.iniface_mask, 0xff, in_len + 1);
1055
1056                         if (invert)
1057                                 ip.invflags |= IPT_INV_VIA_IN;
1058
1059                         break;
1060
1061                 case 'j':
1062                         target_name = optarg;
1063                         xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
1064
1065                         if (xt_t == NULL)
1066                                 break;
1067
1068                         size = ALIGN(sizeof(struct ipt_entry_target)) +
1069                                                                 xt_t->size;
1070
1071                         xt_t->t = g_try_malloc0(size);
1072                         if (xt_t->t == NULL)
1073                                 goto out;
1074                         xt_t->t->u.target_size = size;
1075                         strcpy(xt_t->t->u.user.name, target_name);
1076                         xt_t->t->u.user.revision = xt_t->revision;
1077                         if (xt_t->init != NULL)
1078                                 xt_t->init(xt_t->t);
1079                         iptables_globals.opts =
1080                                 xtables_merge_options(
1081 #if XTABLES_VERSION_CODE > 5
1082                                                      iptables_globals.orig_opts,
1083 #endif
1084                                                      iptables_globals.opts,
1085                                                      xt_t->extra_opts,
1086                                                      &xt_t->option_offset);
1087                         if (iptables_globals.opts == NULL)
1088                                 goto out;
1089
1090                         break;
1091
1092                 case 'm':
1093                         match_name = optarg;
1094
1095                         xt_m = xtables_find_match(optarg, XTF_LOAD_MUST_SUCCEED, NULL);
1096                         size = ALIGN(sizeof(struct ipt_entry_match)) +
1097                                                                 xt_m->size;
1098                         xt_m->m = g_try_malloc0(size);
1099                         if (xt_m == NULL)
1100                                 goto out;
1101                         xt_m->m->u.match_size = size;
1102                         strcpy(xt_m->m->u.user.name, xt_m->name);
1103                         xt_m->m->u.user.revision = xt_m->revision;
1104                         if (xt_m->init != NULL)
1105                                 xt_m->init(xt_m->m);
1106                         if (xt_m != xt_m->next) {
1107                                 iptables_globals.opts =
1108                                 xtables_merge_options(
1109 #if XTABLES_VERSION_CODE > 5
1110                                                 iptables_globals.orig_opts,
1111 #endif
1112                                                 iptables_globals.opts,
1113                                                 xt_m->extra_opts,
1114                                                 &xt_m->option_offset);
1115                                 if (iptables_globals.opts == NULL)
1116                                         goto out;
1117                         }
1118
1119                         break;
1120
1121                 case 'o':
1122                         out_len = strlen(optarg);
1123
1124                         if (out_len + 1 > IFNAMSIZ)
1125                                 break;
1126
1127                         strcpy(ip.outiface, optarg);
1128                         memset(ip.outiface_mask, 0xff, out_len + 1);
1129
1130                         if (invert)
1131                                 ip.invflags |= IPT_INV_VIA_OUT;
1132
1133                         break;
1134
1135                 case 's':
1136                         if (!inet_pton(AF_INET, optarg, &src))
1137                                 break;
1138
1139                         ip.src = src;
1140                         inet_pton(AF_INET, "255.255.255.255", &ip.smsk);
1141
1142                         if (invert)
1143                                 ip.invflags |= IPT_INV_SRCIP;
1144
1145                         break;
1146
1147                 case 't':
1148                         table_name = optarg;
1149                         break;
1150
1151                 case 1:
1152                         if (optarg[0] == '!' && optarg[1] == '\0') {
1153                                 invert = TRUE;
1154                                 optarg[0] = '\0';
1155                                 continue;
1156                         }
1157
1158                         connman_error("Invalid option");
1159
1160                         ret = -EINVAL;
1161                         goto out;
1162
1163                 default:
1164                         if (xt_t == NULL || xt_t->parse == NULL ||
1165                             !xt_t->parse(c - xt_t->option_offset, argv, invert,
1166                                         &xt_t->tflags, NULL, &xt_t->t)) {
1167                                 if (xt_m == NULL || xt_m->parse == NULL)
1168                                         break;
1169
1170                                 xt_m->parse(c - xt_m->option_offset, argv,
1171                                         invert, &xt_m->mflags, NULL, &xt_m->m);
1172                         }
1173
1174                         break;
1175                 }
1176
1177                 invert = FALSE;
1178         }
1179
1180         if (table_name == NULL)
1181                 table_name = "filter";
1182
1183         table = iptables_init(table_name);
1184         if (table == NULL) {
1185                 ret = -EINVAL;
1186                 goto out;
1187         }
1188
1189         if (dump) {
1190                 iptables_dump(table);
1191
1192                 ret = 0;
1193                 goto out;
1194         }
1195
1196         if (flush_chain) {
1197                 DBG("Flush chain %s", flush_chain);
1198
1199                 iptables_flush_chain(table, flush_chain);
1200
1201                 goto out;
1202         }
1203
1204         if (chain && new_chain) {
1205                 ret = -EINVAL;
1206                 goto out;
1207         }
1208
1209         if (new_chain) {
1210                 DBG("New chain %s", new_chain);
1211
1212                 ret = iptables_add_chain(table, new_chain);
1213                 goto out;
1214         }
1215
1216         if (chain) {
1217                 if (target_name == NULL)
1218                         return -1;
1219
1220                 DBG("Adding %s to %s (match %s)",
1221                                 target_name, chain, match_name);
1222
1223                 ret = iptables_add_rule(table, &ip, chain, target_name, xt_t,
1224                                         match_name, xt_m);
1225
1226                 goto out;
1227         }
1228
1229 out:
1230         if (xt_t)
1231                 g_free(xt_t->t);
1232
1233         if (xt_m)
1234                 g_free(xt_m->m);
1235
1236         return ret;
1237 }
1238
1239 int __connman_iptables_command(const char *format, ...)
1240 {
1241         char **argv, **arguments, *command;
1242         int argc, i, ret;
1243         va_list args;
1244
1245         if (format == NULL)
1246                 return -EINVAL;
1247
1248         va_start(args, format);
1249
1250         command = g_strdup_vprintf(format, args);
1251
1252         va_end(args);
1253
1254         if (command == NULL)
1255                 return -ENOMEM;
1256
1257         arguments = g_strsplit_set(command, " ", -1);
1258
1259         for (argc = 0; arguments[argc]; argc++);
1260         ++argc;
1261
1262         DBG("command %s argc %d", command, argc);
1263
1264         argv = g_try_malloc0(argc * sizeof(char *));
1265         if (argv == NULL) {
1266                 g_free(command);
1267                 g_strfreev(arguments);
1268                 return -ENOMEM;
1269         }
1270
1271         argv[0] = "iptables";
1272         for (i = 1; i < argc; i++)
1273                 argv[i] = arguments[i - 1];
1274
1275         ret = iptables_command(argc, argv);
1276
1277         g_free(command);
1278         g_strfreev(arguments);
1279         g_free(argv);
1280
1281         return ret;
1282 }
1283
1284
1285 int __connman_iptables_commit(const char *table_name)
1286 {
1287         struct connman_iptables *table;
1288         struct ipt_replace *repl;
1289         int err;
1290
1291         DBG("%s", table_name);
1292
1293         table = g_hash_table_lookup(table_hash, table_name);
1294         if (table == NULL)
1295                 return -EINVAL;
1296
1297         repl = iptables_blob(table);
1298
1299         err = iptables_replace(table, repl);
1300
1301         g_free(repl->counters);
1302         g_free(repl);
1303
1304         if (err < 0)
1305             return err;
1306
1307         g_hash_table_remove(table_hash, table_name);
1308
1309         return 0;
1310 }
1311
1312 static void remove_table(gpointer user_data)
1313 {
1314         struct connman_iptables *table = user_data;
1315
1316         table_cleanup(table);
1317 }
1318
1319 int __connman_iptables_init(void)
1320 {
1321         DBG("");
1322
1323         table_hash = g_hash_table_new_full(g_str_hash, g_str_equal,
1324                                                 g_free, remove_table);
1325
1326         xtables_init_all(&iptables_globals, NFPROTO_IPV4);
1327
1328         return 0;
1329
1330 }
1331
1332 void __connman_iptables_cleanup(void)
1333 {
1334         DBG("");
1335
1336         g_hash_table_destroy(table_hash);
1337
1338         xtables_free_opts(1);
1339 }