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 int iptables_delete_chain(struct connman_iptables *table, char *name)
 487 {
 488         struct connman_iptables_entry *entry;
 489         GList *chain_head, *chain_tail;
 490
 491         chain_head = find_chain_head(table, name);
 492         if (chain_head == NULL)
 493                 return -EINVAL;
 494
 495         entry = chain_head->data;
 496
 497         /* We cannot remove builtin chain */
 498         if (entry->builtin >= 0)
 499                 return -EINVAL;
 500
 501         chain_tail = find_chain_tail(table, name);
 502         if (chain_tail == NULL)
 503                 return -EINVAL;
 504
 505         /* Chain must be flushed */
 506         if (chain_head->next != chain_tail->prev)
 507                 return -EINVAL;
 508
 509         remove_table_entry(table, entry);
 510
 511         entry = chain_tail->prev->data;
 512         remove_table_entry(table, entry);
 513
 514         update_offsets(table);
 515
 516         return 0;
 517 }
 518
 519 static struct ipt_entry *
 520 new_rule(struct connman_iptables *table, struct ipt_ip *ip,
 521                 char *target_name, struct xtables_target *xt_t,
 522                 char *match_name, struct xtables_match *xt_m)
 523 {
 524         struct ipt_entry *new_entry;
 525         size_t match_size, target_size;
 526         int is_builtin = is_builtin_target(target_name);
 527
 528         if (xt_m)
 529                 match_size = xt_m->m->u.match_size;
 530         else
 531                 match_size = 0;
 532
 533         if (xt_t)
 534                 target_size = ALIGN(xt_t->t->u.target_size);
 535         else
 536                 target_size = ALIGN(sizeof(struct xt_standard_target));
 537
 538         new_entry = g_try_malloc0(sizeof(struct ipt_entry) + target_size +
 539                                                                 match_size);
 540         if (new_entry == NULL)
 541                 return NULL;
 542
 543         memcpy(&new_entry->ip, ip, sizeof(struct ipt_ip));
 544
 545         new_entry->target_offset = sizeof(struct ipt_entry) + match_size;
 546         new_entry->next_offset = sizeof(struct ipt_entry) + target_size +
 547                                                                 match_size;
 548         if (xt_m) {
 549                 struct xt_entry_match *entry_match;
 550
 551                 entry_match = (struct xt_entry_match *)new_entry->elems;
 552                 memcpy(entry_match, xt_m->m, match_size);
 553         }
 554
 555         if (xt_t) {
 556                 struct xt_entry_target *entry_target;
 557
 558                 if (is_builtin) {
 559                         struct xt_standard_target *target;
 560
 561                         target = (struct xt_standard_target *)(xt_t->t);
 562                         strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
 563                         target->verdict = target_to_verdict(target_name);
 564                 }
 565
 566                 entry_target = ipt_get_target(new_entry);
 567                 memcpy(entry_target, xt_t->t, target_size);
 568         } else {
 569                 struct connman_iptables_entry *target_rule;
 570                 struct xt_standard_target *target;
 571                 GList *chain_head;
 572
 573                 /*
 574                  * This is a user defined target, i.e. a chain jump.
 575                  * We search for the chain head, and the target verdict
 576                  * is the first rule's offset on this chain.
 577                  * The offset is from the beginning of the table.
 578                  */
 579
 580                 chain_head = find_chain_head(table, target_name);
 581                 if (chain_head == NULL || chain_head->next == NULL) {
 582                         g_free(new_entry);
 583                         return NULL;
 584                 }
 585
 586                 target_rule = chain_head->next->data;
 587
 588                 target = (struct xt_standard_target *)ipt_get_target(new_entry);
 589                 strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
 590                 target->target.u.user.target_size = target_size;
 591                 target->verdict = target_rule->offset;
 592         }
 593
 594         return new_entry;
 595 }
 596
 597 static void update_hooks(struct connman_iptables *table, GList *chain_head,
 598                                 struct ipt_entry *entry)
 599 {
 600         GList *list;
 601         struct connman_iptables_entry *head, *e;
 602         int builtin;
 603
 604         if (chain_head == NULL)
 605                 return;
 606
 607         head = chain_head->data;
 608
 609         builtin = head->builtin;
 610         if (builtin < 0)
 611                 return;
 612
 613         table->underflow[builtin] += entry->next_offset;
 614
 615         for (list = chain_head->next; list; list = list->next) {
 616                 e = list->data;
 617
 618                 builtin = e->builtin;
 619                 if (builtin < 0)
 620                         continue;
 621
 622                 table->hook_entry[builtin] += entry->next_offset;
 623                 table->underflow[builtin] += entry->next_offset;
 624         }
 625 }
 626
 627 static struct ipt_entry *prepare_rule_inclusion(struct connman_iptables *table,
 628                                 struct ipt_ip *ip, char *chain_name,
 629                                 char *target_name, struct xtables_target *xt_t,
 630                                 char *match_name, struct xtables_match *xt_m,
 631                                 int *builtin)
 632 {
 633         GList *chain_tail, *chain_head;
 634         struct ipt_entry *new_entry;
 635         struct connman_iptables_entry *head;
 636
 637         chain_head = find_chain_head(table, chain_name);
 638         if (chain_head == NULL)
 639                 return NULL;
 640
 641         chain_tail = find_chain_tail(table, chain_name);
 642         if (chain_tail == NULL)
 643                 return NULL;
 644
 645         new_entry = new_rule(table, ip, target_name, xt_t, match_name, xt_m);
 646         if (new_entry == NULL)
 647                 return NULL;
 648
 649         update_hooks(table, chain_head, new_entry);
 650
 651         /*
 652          * If the chain is builtin, and does not have any rule,
 653          * then the one that we're inserting is becoming the head
 654          * and thus needs the builtin flag.
 655          */
 656         head = chain_head->data;
 657         if (head->builtin < 0)
 658                 *builtin = -1;
 659         else if (chain_head == chain_tail->prev) {
 660                 *builtin = head->builtin;
 661                 head->builtin = -1;
 662         }
 663
 664         return new_entry;
 665 }
 666
 667 static int
 668 iptables_add_rule(struct connman_iptables *table,
 669                                 struct ipt_ip *ip, char *chain_name,
 670                                 char *target_name, struct xtables_target *xt_t,
 671                                 char *match_name, struct xtables_match *xt_m)
 672 {
 673         GList *chain_tail;
 674         struct ipt_entry *new_entry;
 675         int builtin = -1, ret;
 676
 677         DBG("");
 678
 679         chain_tail = find_chain_tail(table, chain_name);
 680         if (chain_tail == NULL)
 681                 return -EINVAL;
 682
 683         new_entry = prepare_rule_inclusion(table, ip, chain_name,
 684                         target_name, xt_t, match_name, xt_m, &builtin);
 685         if (new_entry == NULL)
 686                 return -EINVAL;
 687
 688         ret = iptables_add_entry(table, new_entry, chain_tail->prev, builtin);
 689         if (ret < 0)
 690                 g_free(new_entry);
 691
 692         return ret;
 693 }
 694
 695 static int iptables_insert_rule(struct connman_iptables *table,
 696                                 struct ipt_ip *ip, char *chain_name,
 697                                 char *target_name, struct xtables_target *xt_t,
 698                                 char *match_name, struct xtables_match *xt_m)
 699 {
 700         struct ipt_entry *new_entry;
 701         int builtin = -1, ret;
 702         GList *chain_head;
 703
 704         chain_head = find_chain_head(table, chain_name);
 705         if (chain_head == NULL)
 706                 return -EINVAL;
 707
 708         new_entry = prepare_rule_inclusion(table, ip, chain_name,
 709                         target_name, xt_t, match_name, xt_m, &builtin);
 710         if (new_entry == NULL)
 711                 return -EINVAL;
 712
 713         ret = iptables_add_entry(table, new_entry, chain_head->next, builtin);
 714         if (ret < 0)
 715                 g_free(new_entry);
 716
 717         return ret;
 718 }
 719
 720 static struct ipt_replace *
 721 iptables_blob(struct connman_iptables *table)
 722 {
 723         struct ipt_replace *r;
 724         GList *list;
 725         struct connman_iptables_entry *e;
 726         unsigned char *entry_index;
 727
 728         r = g_try_malloc0(sizeof(struct ipt_replace) + table->size);
 729         if (r == NULL)
 730                 return NULL;
 731
 732         memset(r, 0, sizeof(*r) + table->size);
 733
 734         r->counters = g_try_malloc0(sizeof(struct xt_counters)
 735                                 * table->old_entries);
 736         if (r->counters == NULL) {
 737                 g_free(r);
 738                 return NULL;
 739         }
 740
 741         strcpy(r->name, table->info->name);
 742         r->num_entries = table->num_entries;
 743         r->size = table->size;
 744
 745         r->num_counters = table->old_entries;
 746         r->valid_hooks  = table->info->valid_hooks;
 747
 748         memcpy(r->hook_entry, table->hook_entry, sizeof(table->hook_entry));
 749         memcpy(r->underflow, table->underflow, sizeof(table->underflow));
 750
 751         entry_index = (unsigned char *)r->entries;
 752         for (list = table->entries; list; list = list->next) {
 753                 e = list->data;
 754
 755                 memcpy(entry_index, e->entry, e->entry->next_offset);
 756                 entry_index += e->entry->next_offset;
 757         }
 758
 759         return r;
 760 }
 761
 762 static void dump_ip(struct ipt_entry *entry)
 763 {
 764         struct ipt_ip *ip = &entry->ip;
 765         char ip_string[INET6_ADDRSTRLEN];
 766         char ip_mask[INET6_ADDRSTRLEN];
 767
 768         if (strlen(ip->iniface))
 769                 connman_info("\tin %s", ip->iniface);
 770
 771         if (strlen(ip->outiface))
 772                 connman_info("\tout %s", ip->outiface);
 773
 774         if (inet_ntop(AF_INET, &ip->src, ip_string, INET6_ADDRSTRLEN) != NULL &&
 775                         inet_ntop(AF_INET, &ip->smsk,
 776                                         ip_mask, INET6_ADDRSTRLEN) != NULL)
 777                 connman_info("\tsrc %s/%s", ip_string, ip_mask);
 778
 779         if (inet_ntop(AF_INET, &ip->dst, ip_string, INET6_ADDRSTRLEN) != NULL &&
 780                         inet_ntop(AF_INET, &ip->dmsk,
 781                                         ip_mask, INET6_ADDRSTRLEN) != NULL)
 782                 connman_info("\tdst %s/%s", ip_string, ip_mask);
 783 }
 784
 785 static void dump_target(struct connman_iptables *table,
 786                                 struct ipt_entry *entry)
 787
 788 {
 789         struct xtables_target *xt_t;
 790         struct xt_entry_target *target;
 791
 792         target = ipt_get_target(entry);
 793
 794         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
 795                 struct xt_standard_target *t;
 796
 797                 t = (struct xt_standard_target *)target;
 798
 799                 switch (t->verdict) {
 800                 case XT_RETURN:
 801                         connman_info("\ttarget RETURN");
 802                         break;
 803
 804                 case -NF_ACCEPT - 1:
 805                         connman_info("\ttarget ACCEPT");
 806                         break;
 807
 808                 case -NF_DROP - 1:
 809                         connman_info("\ttarget DROP");
 810                         break;
 811
 812                 case -NF_QUEUE - 1:
 813                         connman_info("\ttarget QUEUE");
 814                         break;
 815
 816                 case -NF_STOP - 1:
 817                         connman_info("\ttarget STOP");
 818                         break;
 819
 820                 default:
 821                         connman_info("\tJUMP @%p (0x%x)",
 822                                 (char*)table->blob_entries->entrytable +
 823                                 t->verdict, t->verdict);
 824                         break;
 825                 }
 826
 827                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
 828                                                 XTF_LOAD_MUST_SUCCEED);
 829
 830                 if(xt_t->print != NULL)
 831                         xt_t->print(NULL, target, 1);
 832         } else {
 833                 xt_t = xtables_find_target(target->u.user.name, XTF_TRY_LOAD);
 834                 if (xt_t == NULL) {
 835                         connman_info("\ttarget %s", target->u.user.name);
 836                         return;
 837                 }
 838
 839                 if(xt_t->print != NULL) {
 840                         connman_info("\ttarget ");
 841                         xt_t->print(NULL, target, 1);
 842                 }
 843         }
 844 }
 845
 846 static void dump_match(struct connman_iptables *table, struct ipt_entry *entry)
 847 {
 848         struct xtables_match *xt_m;
 849         struct xt_entry_match *match;
 850
 851         if (entry->elems == (unsigned char *)entry + entry->target_offset)
 852                 return;
 853
 854         match = (struct xt_entry_match *) entry->elems;
 855
 856         if (!strlen(match->u.user.name))
 857                 return;
 858
 859         xt_m = xtables_find_match(match->u.user.name, XTF_TRY_LOAD, NULL);
 860         if (xt_m == NULL)
 861                 goto out;
 862
 863         if(xt_m->print != NULL) {
 864                 connman_info("\tmatch ");
 865                 xt_m->print(NULL, match, 1);
 866
 867                 return;
 868         }
 869
 870 out:
 871         connman_info("\tmatch %s", match->u.user.name);
 872
 873 }
 874
 875 static int dump_entry(struct ipt_entry *entry,
 876                                 struct connman_iptables *table)
 877 {
 878         struct xt_entry_target *target;
 879         unsigned int offset;
 880         int builtin;
 881
 882         offset = (char *)entry - (char *)table->blob_entries->entrytable;
 883         target = ipt_get_target(entry);
 884         builtin = is_hook_entry(table, entry);
 885
 886         if (entry_to_offset(table, entry) + entry->next_offset ==
 887                                         table->blob_entries->size) {
 888                 connman_info("End of CHAIN 0x%x", offset);
 889                 return 0;
 890         }
 891
 892         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET)) {
 893                 connman_info("USER CHAIN (%s) %p  match %p  target %p  size %d",
 894                         target->data, entry, entry->elems,
 895                         (char *)entry + entry->target_offset,
 896                                 entry->next_offset);
 897
 898                 return 0;
 899         } else if (builtin >= 0) {
 900                 connman_info("CHAIN (%s) %p  match %p  target %p  size %d",
 901                         hooknames[builtin], entry, entry->elems,
 902                         (char *)entry + entry->target_offset,
 903                                 entry->next_offset);
 904         } else {
 905                 connman_info("RULE %p  match %p  target %p  size %d", entry,
 906                         entry->elems,
 907                         (char *)entry + entry->target_offset,
 908                                 entry->next_offset);
 909         }
 910
 911         dump_match(table, entry);
 912         dump_target(table, entry);
 913         dump_ip(entry);
 914
 915         return 0;
 916 }
 917
 918 static void iptables_dump(struct connman_iptables *table)
 919 {
 920         connman_info("%s valid_hooks=0x%08x, num_entries=%u, size=%u",
 921                         table->info->name,
 922                         table->info->valid_hooks, table->info->num_entries,
 923                                 table->info->size);
 924
 925         ENTRY_ITERATE(table->blob_entries->entrytable,
 926                         table->blob_entries->size,
 927                         dump_entry, table);
 928
 929 }
 930
 931 static int iptables_get_entries(struct connman_iptables *table)
 932 {
 933         socklen_t entry_size;
 934
 935         entry_size = sizeof(struct ipt_get_entries) + table->info->size;
 936
 937         return getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_ENTRIES,
 938                                 table->blob_entries, &entry_size);
 939 }
 940
 941 static int iptables_replace(struct connman_iptables *table,
 942                                         struct ipt_replace *r)
 943 {
 944         return setsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_SET_REPLACE, r,
 945                          sizeof(*r) + r->size);
 946 }
 947
 948 static int add_entry(struct ipt_entry *entry, struct connman_iptables *table)
 949 {
 950         struct ipt_entry *new_entry;
 951         int builtin;
 952
 953         new_entry = g_try_malloc0(entry->next_offset);
 954         if (new_entry == NULL)
 955                 return -ENOMEM;
 956
 957         memcpy(new_entry, entry, entry->next_offset);
 958
 959         builtin = is_hook_entry(table, entry);
 960
 961         return iptables_add_entry(table, new_entry, NULL, builtin);
 962 }
 963
 964 static void table_cleanup(struct connman_iptables *table)
 965 {
 966         GList *list;
 967         struct connman_iptables_entry *entry;
 968
 969         close(table->ipt_sock);
 970
 971         for (list = table->entries; list; list = list->next) {
 972                 entry = list->data;
 973
 974                 g_free(entry->entry);
 975                 g_free(entry);
 976         }
 977
 978         g_list_free(table->entries);
 979         g_free(table->info);
 980         g_free(table->blob_entries);
 981         g_free(table);
 982 }
 983
 984 static struct connman_iptables *iptables_init(char *table_name)
 985 {
 986         struct connman_iptables *table;
 987         socklen_t s;
 988
 989         DBG("%s", table_name);
 990
 991         table = g_hash_table_lookup(table_hash, table_name);
 992         if (table != NULL)
 993                 return table;
 994
 995         table = g_try_new0(struct connman_iptables, 1);
 996         if (table == NULL)
 997                 return NULL;
 998
 999         table->info = g_try_new0(struct ipt_getinfo, 1);
1000         if (table->info == NULL)
1001                 goto err;
1002
1003         table->ipt_sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
1004         if (table->ipt_sock < 0)
1005                 goto err;
1006
1007         s = sizeof(*table->info);
1008         strcpy(table->info->name, table_name);
1009         if (getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_INFO,
1010                                                 table->info, &s) < 0)
1011                 goto err;
1012
1013         table->blob_entries = g_try_malloc0(sizeof(struct ipt_get_entries) +
1014                                                 table->info->size);
1015         if (table->blob_entries == NULL)
1016                 goto err;
1017
1018         strcpy(table->blob_entries->name, table_name);
1019         table->blob_entries->size = table->info->size;
1020
1021         if (iptables_get_entries(table) < 0)
1022                 goto err;
1023
1024         table->num_entries = 0;
1025         table->old_entries = table->info->num_entries;
1026         table->size = 0;
1027
1028         memcpy(table->underflow, table->info->underflow,
1029                                 sizeof(table->info->underflow));
1030         memcpy(table->hook_entry, table->info->hook_entry,
1031                                 sizeof(table->info->hook_entry));
1032
1033         ENTRY_ITERATE(table->blob_entries->entrytable,
1034                         table->blob_entries->size,
1035                                 add_entry, table);
1036
1037         g_hash_table_insert(table_hash, g_strdup(table_name), table);
1038
1039         return table;
1040
1041 err:
1042
1043         table_cleanup(table);
1044
1045         return NULL;
1046 }
1047
1048 static struct option iptables_opts[] = {
1049         {.name = "append",        .has_arg = 1, .val = 'A'},
1050         {.name = "flush-chain",   .has_arg = 1, .val = 'F'},
1051         {.name = "insert",        .has_arg = 1, .val = 'I'},
1052         {.name = "list",          .has_arg = 2, .val = 'L'},
1053         {.name = "new-chain",     .has_arg = 1, .val = 'N'},
1054         {.name = "delete-chain",  .has_arg = 1, .val = 'X'},
1055         {.name = "destination",   .has_arg = 1, .val = 'd'},
1056         {.name = "in-interface",  .has_arg = 1, .val = 'i'},
1057         {.name = "jump",          .has_arg = 1, .val = 'j'},
1058         {.name = "match",         .has_arg = 1, .val = 'm'},
1059         {.name = "out-interface", .has_arg = 1, .val = 'o'},
1060         {.name = "source",        .has_arg = 1, .val = 's'},
1061         {.name = "table",         .has_arg = 1, .val = 't'},
1062         {NULL},
1063 };
1064
1065 struct xtables_globals iptables_globals = {
1066         .option_offset = 0,
1067         .opts = iptables_opts,
1068         .orig_opts = iptables_opts,
1069 };
1070
1071 static int iptables_command(int argc, char *argv[])
1072 {
1073         struct connman_iptables *table;
1074         struct xtables_match *xt_m;
1075         struct xtables_target *xt_t;
1076         struct ipt_ip ip;
1077         char *table_name, *chain, *new_chain, *match_name, *target_name;
1078         char *flush_chain, *delete_chain;
1079         int c, ret, in_len, out_len;
1080         size_t size;
1081         gboolean dump, invert, insert;
1082         struct in_addr src, dst;
1083
1084         if (argc == 0)
1085                 return -EINVAL;
1086
1087         dump = FALSE;
1088         invert = FALSE;
1089         insert = FALSE;
1090         table_name = chain = new_chain = match_name = target_name = NULL;
1091         flush_chain = delete_chain = NULL;
1092         memset(&ip, 0, sizeof(struct ipt_ip));
1093         table = NULL;
1094         xt_m = NULL;
1095         xt_t = NULL;
1096         ret = 0;
1097
1098         optind = 0;
1099
1100         while ((c = getopt_long(argc, argv, "-A:F:I:L::N:X:d:j:i:m:o:s:t:",
1101                                         iptables_globals.opts, NULL)) != -1) {
1102                 switch (c) {
1103                 case 'A':
1104                         /* It is either -A, -D or -I at once */
1105                         if (chain)
1106                                 goto out;
1107
1108                         chain = optarg;
1109                         break;
1110
1111                 case 'F':
1112                         flush_chain = optarg;
1113                         break;
1114
1115                 case 'I':
1116                         /* It is either -A, -D or -I at once */
1117                         if (chain)
1118                                 goto out;
1119
1120                         chain = optarg;
1121                         insert = TRUE;
1122                         break;
1123
1124                 case 'L':
1125                         dump = TRUE;
1126                         break;
1127
1128                 case 'N':
1129                         new_chain = optarg;
1130                         break;
1131
1132                 case 'X':
1133                         delete_chain = optarg;
1134                         break;
1135
1136                 case 'd':
1137                         if (!inet_pton(AF_INET, optarg, &dst))
1138                                 break;
1139
1140                         ip.dst = dst;
1141                         inet_pton(AF_INET, "255.255.255.255", &ip.dmsk);
1142
1143                         if (invert)
1144                                 ip.invflags |= IPT_INV_DSTIP;
1145
1146                         break;
1147
1148                 case 'i':
1149                         in_len = strlen(optarg);
1150
1151                         if (in_len + 1 > IFNAMSIZ)
1152                                 break;
1153
1154                         strcpy(ip.iniface, optarg);
1155                         memset(ip.iniface_mask, 0xff, in_len + 1);
1156
1157                         if (invert)
1158                                 ip.invflags |= IPT_INV_VIA_IN;
1159
1160                         break;
1161
1162                 case 'j':
1163                         target_name = optarg;
1164                         xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
1165
1166                         if (xt_t == NULL)
1167                                 break;
1168
1169                         size = ALIGN(sizeof(struct ipt_entry_target)) +
1170                                                                 xt_t->size;
1171
1172                         xt_t->t = g_try_malloc0(size);
1173                         if (xt_t->t == NULL)
1174                                 goto out;
1175                         xt_t->t->u.target_size = size;
1176                         strcpy(xt_t->t->u.user.name, target_name);
1177                         xt_t->t->u.user.revision = xt_t->revision;
1178                         if (xt_t->init != NULL)
1179                                 xt_t->init(xt_t->t);
1180                         iptables_globals.opts =
1181                                 xtables_merge_options(
1182 #if XTABLES_VERSION_CODE > 5
1183                                                      iptables_globals.orig_opts,
1184 #endif
1185                                                      iptables_globals.opts,
1186                                                      xt_t->extra_opts,
1187                                                      &xt_t->option_offset);
1188                         if (iptables_globals.opts == NULL)
1189                                 goto out;
1190
1191                         break;
1192
1193                 case 'm':
1194                         match_name = optarg;
1195
1196                         xt_m = xtables_find_match(optarg, XTF_LOAD_MUST_SUCCEED, NULL);
1197                         size = ALIGN(sizeof(struct ipt_entry_match)) +
1198                                                                 xt_m->size;
1199                         xt_m->m = g_try_malloc0(size);
1200                         if (xt_m == NULL)
1201                                 goto out;
1202                         xt_m->m->u.match_size = size;
1203                         strcpy(xt_m->m->u.user.name, xt_m->name);
1204                         xt_m->m->u.user.revision = xt_m->revision;
1205                         if (xt_m->init != NULL)
1206                                 xt_m->init(xt_m->m);
1207                         if (xt_m != xt_m->next) {
1208                                 iptables_globals.opts =
1209                                 xtables_merge_options(
1210 #if XTABLES_VERSION_CODE > 5
1211                                                 iptables_globals.orig_opts,
1212 #endif
1213                                                 iptables_globals.opts,
1214                                                 xt_m->extra_opts,
1215                                                 &xt_m->option_offset);
1216                                 if (iptables_globals.opts == NULL)
1217                                         goto out;
1218                         }
1219
1220                         break;
1221
1222                 case 'o':
1223                         out_len = strlen(optarg);
1224
1225                         if (out_len + 1 > IFNAMSIZ)
1226                                 break;
1227
1228                         strcpy(ip.outiface, optarg);
1229                         memset(ip.outiface_mask, 0xff, out_len + 1);
1230
1231                         if (invert)
1232                                 ip.invflags |= IPT_INV_VIA_OUT;
1233
1234                         break;
1235
1236                 case 's':
1237                         if (!inet_pton(AF_INET, optarg, &src))
1238                                 break;
1239
1240                         ip.src = src;
1241                         inet_pton(AF_INET, "255.255.255.255", &ip.smsk);
1242
1243                         if (invert)
1244                                 ip.invflags |= IPT_INV_SRCIP;
1245
1246                         break;
1247
1248                 case 't':
1249                         table_name = optarg;
1250                         break;
1251
1252                 case 1:
1253                         if (optarg[0] == '!' && optarg[1] == '\0') {
1254                                 invert = TRUE;
1255                                 optarg[0] = '\0';
1256                                 continue;
1257                         }
1258
1259                         connman_error("Invalid option");
1260
1261                         ret = -EINVAL;
1262                         goto out;
1263
1264                 default:
1265                         if (xt_t == NULL || xt_t->parse == NULL ||
1266                             !xt_t->parse(c - xt_t->option_offset, argv, invert,
1267                                         &xt_t->tflags, NULL, &xt_t->t)) {
1268                                 if (xt_m == NULL || xt_m->parse == NULL)
1269                                         break;
1270
1271                                 xt_m->parse(c - xt_m->option_offset, argv,
1272                                         invert, &xt_m->mflags, NULL, &xt_m->m);
1273                         }
1274
1275                         break;
1276                 }
1277
1278                 invert = FALSE;
1279         }
1280
1281         if (table_name == NULL)
1282                 table_name = "filter";
1283
1284         table = iptables_init(table_name);
1285         if (table == NULL) {
1286                 ret = -EINVAL;
1287                 goto out;
1288         }
1289
1290         if (delete_chain != NULL) {
1291                 printf("Delete chain %s\n", delete_chain);
1292
1293                 iptables_delete_chain(table, delete_chain);
1294
1295                 goto out;
1296         }
1297
1298         if (dump) {
1299                 iptables_dump(table);
1300
1301                 ret = 0;
1302                 goto out;
1303         }
1304
1305         if (flush_chain) {
1306                 DBG("Flush chain %s", flush_chain);
1307
1308                 iptables_flush_chain(table, flush_chain);
1309
1310                 goto out;
1311         }
1312
1313         if (chain && new_chain) {
1314                 ret = -EINVAL;
1315                 goto out;
1316         }
1317
1318         if (new_chain) {
1319                 DBG("New chain %s", new_chain);
1320
1321                 ret = iptables_add_chain(table, new_chain);
1322                 goto out;
1323         }
1324
1325         if (chain) {
1326                 if (target_name == NULL)
1327                         return -1;
1328
1329                 if (insert == TRUE) {
1330                         DBG("Inserting %s to %s (match %s)",
1331                                         target_name, chain, match_name);
1332
1333                         ret = iptables_insert_rule(table, &ip, chain,
1334                                         target_name, xt_t, match_name, xt_m);
1335
1336                         goto out;
1337                 } else {
1338                         DBG("Adding %s to %s (match %s)",
1339                                         target_name, chain, match_name);
1340
1341                         ret = iptables_add_rule(table, &ip, chain,
1342                                         target_name, xt_t, match_name, xt_m);
1343
1344                         goto out;
1345                 }
1346         }
1347
1348 out:
1349         if (xt_t)
1350                 g_free(xt_t->t);
1351
1352         if (xt_m)
1353                 g_free(xt_m->m);
1354
1355         return ret;
1356 }
1357
1358 int __connman_iptables_command(const char *format, ...)
1359 {
1360         char **argv, **arguments, *command;
1361         int argc, i, ret;
1362         va_list args;
1363
1364         if (format == NULL)
1365                 return -EINVAL;
1366
1367         va_start(args, format);
1368
1369         command = g_strdup_vprintf(format, args);
1370
1371         va_end(args);
1372
1373         if (command == NULL)
1374                 return -ENOMEM;
1375
1376         arguments = g_strsplit_set(command, " ", -1);
1377
1378         for (argc = 0; arguments[argc]; argc++);
1379         ++argc;
1380
1381         DBG("command %s argc %d", command, argc);
1382
1383         argv = g_try_malloc0(argc * sizeof(char *));
1384         if (argv == NULL) {
1385                 g_free(command);
1386                 g_strfreev(arguments);
1387                 return -ENOMEM;
1388         }
1389
1390         argv[0] = "iptables";
1391         for (i = 1; i < argc; i++)
1392                 argv[i] = arguments[i - 1];
1393
1394         ret = iptables_command(argc, argv);
1395
1396         g_free(command);
1397         g_strfreev(arguments);
1398         g_free(argv);
1399
1400         return ret;
1401 }
1402
1403
1404 int __connman_iptables_commit(const char *table_name)
1405 {
1406         struct connman_iptables *table;
1407         struct ipt_replace *repl;
1408         int err;
1409
1410         DBG("%s", table_name);
1411
1412         table = g_hash_table_lookup(table_hash, table_name);
1413         if (table == NULL)
1414                 return -EINVAL;
1415
1416         repl = iptables_blob(table);
1417
1418         err = iptables_replace(table, repl);
1419
1420         g_free(repl->counters);
1421         g_free(repl);
1422
1423         if (err < 0)
1424             return err;
1425
1426         g_hash_table_remove(table_hash, table_name);
1427
1428         return 0;
1429 }
1430
1431 static void remove_table(gpointer user_data)
1432 {
1433         struct connman_iptables *table = user_data;
1434
1435         table_cleanup(table);
1436 }
1437
1438 int __connman_iptables_init(void)
1439 {
1440         DBG("");
1441
1442         table_hash = g_hash_table_new_full(g_str_hash, g_str_equal,
1443                                                 g_free, remove_table);
1444
1445         xtables_init_all(&iptables_globals, NFPROTO_IPV4);
1446
1447         return 0;
1448
1449 }
1450
1451 void __connman_iptables_cleanup(void)
1452 {
1453         DBG("");
1454
1455         g_hash_table_destroy(table_hash);
1456
1457         xtables_free_opts(1);
1458 }