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         GList *chain_head, *list;
 246         struct connman_iptables_entry *head, *tail;
 247         struct ipt_entry *entry;
 248         struct xt_entry_target *target;
 249         int builtin;
 250
 251         /* First we look for the head */
 252         for (list = table->entries; list; list = list->next) {
 253                 head = list->data;
 254                 entry = head->entry;
 255
 256                 /* Buit-in chain */
 257                 builtin = head->builtin;
 258                 if (builtin >= 0 && !strcmp(hooknames[builtin], chain_name))
 259                         break;
 260
 261                 /* User defined chain */
 262                 target = ipt_get_target(entry);
 263                 if (!strcmp(target->u.user.name, IPT_ERROR_TARGET) &&
 264                     !strcmp((char *)target->data, chain_name))
 265                         break;
 266         }
 267
 268         if (list == NULL)
 269                 return NULL;
 270
 271         chain_head = list;
 272
 273         /* Then we look for the next chain */
 274         for (list = chain_head->next; list; list = list->next) {
 275                 tail = list->data;
 276                 entry = tail->entry;
 277
 278                 if (is_chain(table, tail))
 279                         return list;
 280         }
 281
 282         /* Nothing found, we return the table end */
 283         return g_list_last(table->entries);
 284 }
 285
 286
 287 static void update_offsets(struct connman_iptables *table)
 288 {
 289         GList *list, *prev;
 290         struct connman_iptables_entry *entry, *prev_entry;
 291
 292         for (list = table->entries; list; list = list->next) {
 293                 entry = list->data;
 294
 295                 if (list == table->entries) {
 296                         entry->offset = 0;
 297
 298                         continue;
 299                 }
 300
 301                 prev = list->prev;
 302                 prev_entry = prev->data;
 303
 304                 entry->offset = prev_entry->offset +
 305                                         prev_entry->entry->next_offset;
 306         }
 307 }
 308
 309 static int iptables_add_entry(struct connman_iptables *table,
 310                                 struct ipt_entry *entry, GList *before,
 311                                         int builtin)
 312 {
 313         GList *list;
 314         struct connman_iptables_entry *e, *tmp, *entry_before;
 315         struct xt_standard_target *t;
 316
 317         if (table == NULL)
 318                 return -1;
 319
 320         e = g_try_malloc0(sizeof(struct connman_iptables_entry));
 321         if (e == NULL)
 322                 return -1;
 323
 324         e->entry = entry;
 325         e->builtin = builtin;
 326
 327         table->entries = g_list_insert_before(table->entries, before, e);
 328         table->num_entries++;
 329         table->size += entry->next_offset;
 330
 331         if (before == NULL) {
 332                 e->offset = table->size - entry->next_offset;
 333
 334                 return 0;
 335         }
 336
 337         entry_before = before->data;
 338
 339         /*
 340          * We've just insterted a new entry. All references before it
 341          * should be bumped accordingly.
 342          */
 343         for (list = table->entries; list != before; list = list->next) {
 344                 tmp = list->data;
 345
 346                 if (!is_jump(tmp))
 347                         continue;
 348
 349                 t = (struct xt_standard_target *)ipt_get_target(tmp->entry);
 350
 351                 if (t->verdict >= entry_before->offset)
 352                         t->verdict += entry->next_offset;
 353         }
 354
 355         update_offsets(table);
 356
 357         return 0;
 358 }
 359
 360 static int iptables_flush_chain(struct connman_iptables *table,
 361                                                 char *name)
 362 {
 363         GList *chain_head, *chain_tail, *list, *next;
 364         struct connman_iptables_entry *entry;
 365         int builtin, removed = 0;
 366
 367         chain_head = find_chain_head(table, name);
 368         if (chain_head == NULL)
 369                 return -EINVAL;
 370
 371         chain_tail = find_chain_tail(table, name);
 372         if (chain_tail == NULL)
 373                 return -EINVAL;
 374
 375         entry = chain_head->data;
 376         builtin = entry->builtin;
 377
 378         if (builtin >= 0)
 379                 list = chain_head;
 380         else
 381                 list = chain_head->next;
 382
 383         if (list == chain_tail->prev)
 384                 return 0;
 385
 386         while (list != chain_tail->prev) {
 387                 entry = list->data;
 388                 next = g_list_next(list);
 389
 390                 table->num_entries--;
 391                 table->size -= entry->entry->next_offset;
 392                 removed += entry->entry->next_offset;
 393
 394                 g_free(entry->entry);
 395
 396                 table->entries = g_list_remove(table->entries, list->data);
 397
 398                 list = next;
 399         }
 400
 401         if (builtin >= 0) {
 402                 struct connman_iptables_entry *e;
 403
 404                 entry = list->data;
 405
 406                 entry->builtin = builtin;
 407
 408                 table->underflow[builtin] -= removed;
 409
 410                 for (list = chain_tail; list; list = list->next) {
 411                         e = list->data;
 412
 413                         builtin = e->builtin;
 414                         if (builtin < 0)
 415                                 continue;
 416
 417                         table->hook_entry[builtin] -= removed;
 418                         table->underflow[builtin] -= removed;
 419                 }
 420         }
 421
 422         update_offsets(table);
 423
 424         return 0;
 425 }
 426
 427 static int iptables_add_chain(struct connman_iptables *table,
 428                                         char *name)
 429 {
 430         GList *last;
 431         struct ipt_entry *entry_head;
 432         struct ipt_entry *entry_return;
 433         struct error_target *error;
 434         struct ipt_standard_target *standard;
 435         u_int16_t entry_head_size, entry_return_size;
 436
 437         last = g_list_last(table->entries);
 438
 439         /*
 440          * An empty chain is composed of:
 441          * - A head entry, with no match and an error target.
 442          *   The error target data is the chain name.
 443          * - A tail entry, with no match and a standard target.
 444          *   The standard target verdict is XT_RETURN (return to the
 445          *   caller).
 446          */
 447
 448         /* head entry */
 449         entry_head_size = sizeof(struct ipt_entry) +
 450                                 sizeof(struct error_target);
 451         entry_head = g_try_malloc0(entry_head_size);
 452         if (entry_head == NULL)
 453                 goto err_head;
 454
 455         memset(entry_head, 0, entry_head_size);
 456
 457         entry_head->target_offset = sizeof(struct ipt_entry);
 458         entry_head->next_offset = entry_head_size;
 459
 460         error = (struct error_target *) entry_head->elems;
 461         strcpy(error->t.u.user.name, IPT_ERROR_TARGET);
 462         error->t.u.user.target_size = ALIGN(sizeof(struct error_target));
 463         strcpy(error->error, name);
 464
 465         if (iptables_add_entry(table, entry_head, last, -1) < 0)
 466                 goto err_head;
 467
 468         /* tail entry */
 469         entry_return_size = sizeof(struct ipt_entry) +
 470                                 sizeof(struct ipt_standard_target);
 471         entry_return = g_try_malloc0(entry_return_size);
 472         if (entry_return == NULL)
 473                 goto err;
 474
 475         memset(entry_return, 0, entry_return_size);
 476
 477         entry_return->target_offset = sizeof(struct ipt_entry);
 478         entry_return->next_offset = entry_return_size;
 479
 480         standard = (struct ipt_standard_target *) entry_return->elems;
 481         standard->target.u.user.target_size =
 482                                 ALIGN(sizeof(struct ipt_standard_target));
 483         standard->verdict = XT_RETURN;
 484
 485         if (iptables_add_entry(table, entry_return, last, -1) < 0)
 486                 goto err;
 487
 488         return 0;
 489
 490 err:
 491         g_free(entry_return);
 492 err_head:
 493         g_free(entry_head);
 494
 495         return -ENOMEM;
 496 }
 497
 498 static struct ipt_entry *
 499 new_rule(struct connman_iptables *table, struct ipt_ip *ip,
 500                 char *target_name, struct xtables_target *xt_t,
 501                 char *match_name, struct xtables_match *xt_m)
 502 {
 503         struct ipt_entry *new_entry;
 504         size_t match_size, target_size;
 505         int is_builtin = is_builtin_target(target_name);
 506
 507         if (xt_m)
 508                 match_size = xt_m->m->u.match_size;
 509         else
 510                 match_size = 0;
 511
 512         if (xt_t)
 513                 target_size = ALIGN(xt_t->t->u.target_size);
 514         else
 515                 target_size = ALIGN(sizeof(struct xt_standard_target));
 516
 517         new_entry = g_try_malloc0(sizeof(struct ipt_entry) + target_size +
 518                                                                 match_size);
 519         if (new_entry == NULL)
 520                 return NULL;
 521
 522         memcpy(&new_entry->ip, ip, sizeof(struct ipt_ip));
 523
 524         new_entry->target_offset = sizeof(struct ipt_entry) + match_size;
 525         new_entry->next_offset = sizeof(struct ipt_entry) + target_size +
 526                                                                 match_size;
 527         if (xt_m) {
 528                 struct xt_entry_match *entry_match;
 529
 530                 entry_match = (struct xt_entry_match *)new_entry->elems;
 531                 memcpy(entry_match, xt_m->m, match_size);
 532         }
 533
 534         if (xt_t) {
 535                 struct xt_entry_target *entry_target;
 536
 537                 if (is_builtin) {
 538                         struct xt_standard_target *target;
 539
 540                         target = (struct xt_standard_target *)(xt_t->t);
 541                         strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
 542                         target->verdict = target_to_verdict(target_name);
 543                 }
 544
 545                 entry_target = ipt_get_target(new_entry);
 546                 memcpy(entry_target, xt_t->t, target_size);
 547         } else {
 548                 struct connman_iptables_entry *target_rule;
 549                 struct xt_standard_target *target;
 550                 GList *chain_head;
 551
 552                 /*
 553                  * This is a user defined target, i.e. a chain jump.
 554                  * We search for the chain head, and the target verdict
 555                  * is the first rule's offset on this chain.
 556                  * The offset is from the beginning of the table.
 557                  */
 558
 559                 chain_head = find_chain_head(table, target_name);
 560                 if (chain_head == NULL || chain_head->next == NULL) {
 561                         g_free(new_entry);
 562                         return NULL;
 563                 }
 564
 565                 target_rule = chain_head->next->data;
 566
 567                 target = (struct xt_standard_target *)ipt_get_target(new_entry);
 568                 strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
 569                 target->target.u.user.target_size = target_size;
 570                 target->verdict = target_rule->offset;
 571         }
 572
 573         return new_entry;
 574 }
 575
 576 static void update_hooks(struct connman_iptables *table, GList *chain_head,
 577                                 struct ipt_entry *entry)
 578 {
 579         GList *list;
 580         struct connman_iptables_entry *head, *e;
 581         int builtin;
 582
 583         if (chain_head == NULL)
 584                 return;
 585
 586         head = chain_head->data;
 587
 588         builtin = head->builtin;
 589         if (builtin < 0)
 590                 return;
 591
 592         table->underflow[builtin] += entry->next_offset;
 593
 594         for (list = chain_head->next; list; list = list->next) {
 595                 e = list->data;
 596
 597                 builtin = e->builtin;
 598                 if (builtin < 0)
 599                         continue;
 600
 601                 table->hook_entry[builtin] += entry->next_offset;
 602                 table->underflow[builtin] += entry->next_offset;
 603         }
 604 }
 605
 606 static int
 607 iptables_add_rule(struct connman_iptables *table,
 608                                 struct ipt_ip *ip, char *chain_name,
 609                                 char *target_name, struct xtables_target *xt_t,
 610                                 char *match_name, struct xtables_match *xt_m)
 611 {
 612         GList *chain_tail, *chain_head;
 613         struct ipt_entry *new_entry;
 614         struct connman_iptables_entry *head;
 615         int builtin = -1;
 616
 617         DBG("");
 618
 619         chain_head = find_chain_head(table, chain_name);
 620         if (chain_head == NULL)
 621                 return -EINVAL;
 622
 623         chain_tail = find_chain_tail(table, chain_name);
 624         if (chain_tail == NULL)
 625                 return -EINVAL;
 626
 627         new_entry = new_rule(table, ip,
 628                                 target_name, xt_t,
 629                                 match_name, xt_m);
 630         if (new_entry == NULL)
 631                 return -EINVAL;
 632
 633         update_hooks(table, chain_head, new_entry);
 634
 635         /*
 636          * If the chain is builtin, and does not have any rule,
 637          * then the one that we're inserting is becoming the head
 638          * and thus needs the builtin flag.
 639          */
 640         head = chain_head->data;
 641         if (head->builtin < 0)
 642                 builtin = -1;
 643         else if (chain_head == chain_tail->prev) {
 644                 builtin = head->builtin;
 645                 head->builtin = -1;
 646         }
 647
 648         return iptables_add_entry(table, new_entry, chain_tail->prev, builtin);
 649 }
 650
 651 static struct ipt_replace *
 652 iptables_blob(struct connman_iptables *table)
 653 {
 654         struct ipt_replace *r;
 655         GList *list;
 656         struct connman_iptables_entry *e;
 657         unsigned char *entry_index;
 658
 659         r = g_try_malloc0(sizeof(struct ipt_replace) + table->size);
 660         if (r == NULL)
 661                 return NULL;
 662
 663         memset(r, 0, sizeof(*r) + table->size);
 664
 665         r->counters = g_try_malloc0(sizeof(struct xt_counters)
 666                                 * table->old_entries);
 667         if (r->counters == NULL) {
 668                 g_free(r);
 669                 return NULL;
 670         }
 671
 672         strcpy(r->name, table->info->name);
 673         r->num_entries = table->num_entries;
 674         r->size = table->size;
 675
 676         r->num_counters = table->old_entries;
 677         r->valid_hooks  = table->info->valid_hooks;
 678
 679         memcpy(r->hook_entry, table->hook_entry, sizeof(table->hook_entry));
 680         memcpy(r->underflow, table->underflow, sizeof(table->underflow));
 681
 682         entry_index = (unsigned char *)r->entries;
 683         for (list = table->entries; list; list = list->next) {
 684                 e = list->data;
 685
 686                 memcpy(entry_index, e->entry, e->entry->next_offset);
 687                 entry_index += e->entry->next_offset;
 688         }
 689
 690         return r;
 691 }
 692
 693 static void dump_ip(struct ipt_entry *entry)
 694 {
 695         struct ipt_ip *ip = &entry->ip;
 696         char ip_string[INET6_ADDRSTRLEN];
 697         char ip_mask[INET6_ADDRSTRLEN];
 698
 699         if (strlen(ip->iniface))
 700                 connman_info("\tin %s", ip->iniface);
 701
 702         if (strlen(ip->outiface))
 703                 connman_info("\tout %s", ip->outiface);
 704
 705         if (inet_ntop(AF_INET, &ip->src, ip_string, INET6_ADDRSTRLEN) != NULL &&
 706                         inet_ntop(AF_INET, &ip->smsk,
 707                                         ip_mask, INET6_ADDRSTRLEN) != NULL)
 708                 connman_info("\tsrc %s/%s", ip_string, ip_mask);
 709
 710         if (inet_ntop(AF_INET, &ip->dst, ip_string, INET6_ADDRSTRLEN) != NULL &&
 711                         inet_ntop(AF_INET, &ip->dmsk,
 712                                         ip_mask, INET6_ADDRSTRLEN) != NULL)
 713                 connman_info("\tdst %s/%s", ip_string, ip_mask);
 714 }
 715
 716 static void dump_target(struct connman_iptables *table,
 717                                 struct ipt_entry *entry)
 718
 719 {
 720         struct xtables_target *xt_t;
 721         struct xt_entry_target *target;
 722
 723         target = ipt_get_target(entry);
 724
 725         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
 726                 struct xt_standard_target *t;
 727
 728                 t = (struct xt_standard_target *)target;
 729
 730                 switch (t->verdict) {
 731                 case XT_RETURN:
 732                         connman_info("\ttarget RETURN");
 733                         break;
 734
 735                 case -NF_ACCEPT - 1:
 736                         connman_info("\ttarget ACCEPT");
 737                         break;
 738
 739                 case -NF_DROP - 1:
 740                         connman_info("\ttarget DROP");
 741                         break;
 742
 743                 case -NF_QUEUE - 1:
 744                         connman_info("\ttarget QUEUE");
 745                         break;
 746
 747                 case -NF_STOP - 1:
 748                         connman_info("\ttarget STOP");
 749                         break;
 750
 751                 default:
 752                         connman_info("\tJUMP @%p (0x%x)",
 753                                 (char*)table->blob_entries->entrytable +
 754                                 t->verdict, t->verdict);
 755                         break;
 756                 }
 757
 758                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
 759                                                 XTF_LOAD_MUST_SUCCEED);
 760
 761                 if(xt_t->print != NULL)
 762                         xt_t->print(NULL, target, 1);
 763         } else {
 764                 xt_t = xtables_find_target(target->u.user.name, XTF_TRY_LOAD);
 765                 if (xt_t == NULL) {
 766                         connman_info("\ttarget %s", target->u.user.name);
 767                         return;
 768                 }
 769
 770                 if(xt_t->print != NULL) {
 771                         connman_info("\ttarget ");
 772                         xt_t->print(NULL, target, 1);
 773                 }
 774         }
 775 }
 776
 777 static void dump_match(struct connman_iptables *table, struct ipt_entry *entry)
 778 {
 779         struct xtables_match *xt_m;
 780         struct xt_entry_match *match;
 781
 782         if (entry->elems == (unsigned char *)entry + entry->target_offset)
 783                 return;
 784
 785         match = (struct xt_entry_match *) entry->elems;
 786
 787         if (!strlen(match->u.user.name))
 788                 return;
 789
 790         xt_m = xtables_find_match(match->u.user.name, XTF_TRY_LOAD, NULL);
 791         if (xt_m == NULL)
 792                 goto out;
 793
 794         if(xt_m->print != NULL) {
 795                 connman_info("\tmatch ");
 796                 xt_m->print(NULL, match, 1);
 797
 798                 return;
 799         }
 800
 801 out:
 802         connman_info("\tmatch %s", match->u.user.name);
 803
 804 }
 805
 806 static int dump_entry(struct ipt_entry *entry,
 807                                 struct connman_iptables *table)
 808 {
 809         struct xt_entry_target *target;
 810         unsigned int offset;
 811         int builtin;
 812
 813         offset = (char *)entry - (char *)table->blob_entries->entrytable;
 814         target = ipt_get_target(entry);
 815         builtin = is_hook_entry(table, entry);
 816
 817         if (entry_to_offset(table, entry) + entry->next_offset ==
 818                                         table->blob_entries->size) {
 819                 connman_info("End of CHAIN 0x%x", offset);
 820                 return 0;
 821         }
 822
 823         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET)) {
 824                 connman_info("USER CHAIN (%s) %p  match %p  target %p  size %d",
 825                         target->data, entry, entry->elems,
 826                         (char *)entry + entry->target_offset,
 827                                 entry->next_offset);
 828
 829                 return 0;
 830         } else if (builtin >= 0) {
 831                 connman_info("CHAIN (%s) %p  match %p  target %p  size %d",
 832                         hooknames[builtin], entry, entry->elems,
 833                         (char *)entry + entry->target_offset,
 834                                 entry->next_offset);
 835         } else {
 836                 connman_info("RULE %p  match %p  target %p  size %d", entry,
 837                         entry->elems,
 838                         (char *)entry + entry->target_offset,
 839                                 entry->next_offset);
 840         }
 841
 842         dump_match(table, entry);
 843         dump_target(table, entry);
 844         dump_ip(entry);
 845
 846         return 0;
 847 }
 848
 849 static void iptables_dump(struct connman_iptables *table)
 850 {
 851         connman_info("%s valid_hooks=0x%08x, num_entries=%u, size=%u",
 852                         table->info->name,
 853                         table->info->valid_hooks, table->info->num_entries,
 854                                 table->info->size);
 855
 856         ENTRY_ITERATE(table->blob_entries->entrytable,
 857                         table->blob_entries->size,
 858                         dump_entry, table);
 859
 860 }
 861
 862 static int iptables_get_entries(struct connman_iptables *table)
 863 {
 864         socklen_t entry_size;
 865
 866         entry_size = sizeof(struct ipt_get_entries) + table->info->size;
 867
 868         return getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_ENTRIES,
 869                                 table->blob_entries, &entry_size);
 870 }
 871
 872 static int iptables_replace(struct connman_iptables *table,
 873                                         struct ipt_replace *r)
 874 {
 875         return setsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_SET_REPLACE, r,
 876                          sizeof(*r) + r->size);
 877 }
 878
 879 static int add_entry(struct ipt_entry *entry, struct connman_iptables *table)
 880 {
 881         struct ipt_entry *new_entry;
 882         int builtin;
 883
 884         new_entry = g_try_malloc0(entry->next_offset);
 885         if (new_entry == NULL)
 886                 return -ENOMEM;
 887
 888         memcpy(new_entry, entry, entry->next_offset);
 889
 890         builtin = is_hook_entry(table, entry);
 891
 892         return iptables_add_entry(table, new_entry, NULL, builtin);
 893 }
 894
 895 static void table_cleanup(struct connman_iptables *table)
 896 {
 897         GList *list;
 898         struct connman_iptables_entry *entry;
 899
 900         close(table->ipt_sock);
 901
 902         for (list = table->entries; list; list = list->next) {
 903                 entry = list->data;
 904
 905                 g_free(entry->entry);
 906                 g_free(entry);
 907         }
 908
 909         g_list_free(table->entries);
 910         g_free(table->info);
 911         g_free(table->blob_entries);
 912         g_free(table);
 913 }
 914
 915 static struct connman_iptables *iptables_init(char *table_name)
 916 {
 917         struct connman_iptables *table;
 918         socklen_t s;
 919
 920         DBG("%s", table_name);
 921
 922         table = g_hash_table_lookup(table_hash, table_name);
 923         if (table != NULL)
 924                 return table;
 925
 926         table = g_try_new0(struct connman_iptables, 1);
 927         if (table == NULL)
 928                 return NULL;
 929
 930         table->info = g_try_new0(struct ipt_getinfo, 1);
 931         if (table->info == NULL)
 932                 goto err;
 933
 934         table->ipt_sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
 935         if (table->ipt_sock < 0)
 936                 goto err;
 937
 938         s = sizeof(*table->info);
 939         strcpy(table->info->name, table_name);
 940         if (getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_INFO,
 941                                                 table->info, &s) < 0)
 942                 goto err;
 943
 944         table->blob_entries = g_try_malloc0(sizeof(struct ipt_get_entries) +
 945                                                 table->info->size);
 946         if (table->blob_entries == NULL)
 947                 goto err;
 948
 949         strcpy(table->blob_entries->name, table_name);
 950         table->blob_entries->size = table->info->size;
 951
 952         if (iptables_get_entries(table) < 0)
 953                 goto err;
 954
 955         table->num_entries = 0;
 956         table->old_entries = table->info->num_entries;
 957         table->size = 0;
 958
 959         memcpy(table->underflow, table->info->underflow,
 960                                 sizeof(table->info->underflow));
 961         memcpy(table->hook_entry, table->info->hook_entry,
 962                                 sizeof(table->info->hook_entry));
 963
 964         ENTRY_ITERATE(table->blob_entries->entrytable,
 965                         table->blob_entries->size,
 966                                 add_entry, table);
 967
 968         g_hash_table_insert(table_hash, g_strdup(table_name), table);
 969
 970         return table;
 971
 972 err:
 973
 974         table_cleanup(table);
 975
 976         return NULL;
 977 }
 978
 979 static struct option iptables_opts[] = {
 980         {.name = "append",        .has_arg = 1, .val = 'A'},
 981         {.name = "flush-chain",   .has_arg = 1, .val = 'F'},
 982         {.name = "list",          .has_arg = 2, .val = 'L'},
 983         {.name = "new-chain",     .has_arg = 1, .val = 'N'},
 984         {.name = "destination",   .has_arg = 1, .val = 'd'},
 985         {.name = "in-interface",  .has_arg = 1, .val = 'i'},
 986         {.name = "jump",          .has_arg = 1, .val = 'j'},
 987         {.name = "match",         .has_arg = 1, .val = 'm'},
 988         {.name = "out-interface", .has_arg = 1, .val = 'o'},
 989         {.name = "source",        .has_arg = 1, .val = 's'},
 990         {.name = "table",         .has_arg = 1, .val = 't'},
 991         {NULL},
 992 };
 993
 994 struct xtables_globals iptables_globals = {
 995         .option_offset = 0,
 996         .opts = iptables_opts,
 997         .orig_opts = iptables_opts,
 998 };
 999
1000 static int iptables_command(int argc, char *argv[])
1001 {
1002         struct connman_iptables *table;
1003         struct xtables_match *xt_m;
1004         struct xtables_target *xt_t;
1005         struct ipt_ip ip;
1006         char *table_name, *chain, *new_chain, *match_name, *target_name;
1007         char *flush_chain;
1008         int c, ret, in_len, out_len;
1009         size_t size;
1010         gboolean dump, invert;
1011         struct in_addr src, dst;
1012
1013         if (argc == 0)
1014                 return -EINVAL;
1015
1016         dump = FALSE;
1017         invert = FALSE;
1018         table_name = chain = new_chain = match_name = target_name = NULL;
1019         flush_chain = NULL;
1020         memset(&ip, 0, sizeof(struct ipt_ip));
1021         table = NULL;
1022         xt_m = NULL;
1023         xt_t = NULL;
1024         ret = 0;
1025
1026         optind = 0;
1027
1028         while ((c = getopt_long(argc, argv,
1029            "-A:F:L::N:d:j:i:m:o:s:t:", iptables_globals.opts, NULL)) != -1) {
1030                 switch (c) {
1031                 case 'A':
1032                         chain = optarg;
1033                         break;
1034
1035                 case 'F':
1036                         flush_chain = optarg;
1037                         break;
1038
1039                 case 'L':
1040                         dump = TRUE;
1041                         break;
1042
1043                 case 'N':
1044                         new_chain = optarg;
1045                         break;
1046
1047                 case 'd':
1048                         if (!inet_pton(AF_INET, optarg, &dst))
1049                                 break;
1050
1051                         ip.dst = dst;
1052                         inet_pton(AF_INET, "255.255.255.255", &ip.dmsk);
1053
1054                         if (invert)
1055                                 ip.invflags |= IPT_INV_DSTIP;
1056
1057                         break;
1058
1059                 case 'i':
1060                         in_len = strlen(optarg);
1061
1062                         if (in_len + 1 > IFNAMSIZ)
1063                                 break;
1064
1065                         strcpy(ip.iniface, optarg);
1066                         memset(ip.iniface_mask, 0xff, in_len + 1);
1067
1068                         if (invert)
1069                                 ip.invflags |= IPT_INV_VIA_IN;
1070
1071                         break;
1072
1073                 case 'j':
1074                         target_name = optarg;
1075                         xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
1076
1077                         if (xt_t == NULL)
1078                                 break;
1079
1080                         size = ALIGN(sizeof(struct ipt_entry_target)) +
1081                                                                 xt_t->size;
1082
1083                         xt_t->t = g_try_malloc0(size);
1084                         if (xt_t->t == NULL)
1085                                 goto out;
1086                         xt_t->t->u.target_size = size;
1087                         strcpy(xt_t->t->u.user.name, target_name);
1088                         xt_t->t->u.user.revision = xt_t->revision;
1089                         if (xt_t->init != NULL)
1090                                 xt_t->init(xt_t->t);
1091                         iptables_globals.opts =
1092                                 xtables_merge_options(
1093 #if XTABLES_VERSION_CODE > 5
1094                                                      iptables_globals.orig_opts,
1095 #endif
1096                                                      iptables_globals.opts,
1097                                                      xt_t->extra_opts,
1098                                                      &xt_t->option_offset);
1099                         if (iptables_globals.opts == NULL)
1100                                 goto out;
1101
1102                         break;
1103
1104                 case 'm':
1105                         match_name = optarg;
1106
1107                         xt_m = xtables_find_match(optarg, XTF_LOAD_MUST_SUCCEED, NULL);
1108                         size = ALIGN(sizeof(struct ipt_entry_match)) +
1109                                                                 xt_m->size;
1110                         xt_m->m = g_try_malloc0(size);
1111                         if (xt_m == NULL)
1112                                 goto out;
1113                         xt_m->m->u.match_size = size;
1114                         strcpy(xt_m->m->u.user.name, xt_m->name);
1115                         xt_m->m->u.user.revision = xt_m->revision;
1116                         if (xt_m->init != NULL)
1117                                 xt_m->init(xt_m->m);
1118                         if (xt_m != xt_m->next) {
1119                                 iptables_globals.opts =
1120                                 xtables_merge_options(
1121 #if XTABLES_VERSION_CODE > 5
1122                                                 iptables_globals.orig_opts,
1123 #endif
1124                                                 iptables_globals.opts,
1125                                                 xt_m->extra_opts,
1126                                                 &xt_m->option_offset);
1127                                 if (iptables_globals.opts == NULL)
1128                                         goto out;
1129                         }
1130
1131                         break;
1132
1133                 case 'o':
1134                         out_len = strlen(optarg);
1135
1136                         if (out_len + 1 > IFNAMSIZ)
1137                                 break;
1138
1139                         strcpy(ip.outiface, optarg);
1140                         memset(ip.outiface_mask, 0xff, out_len + 1);
1141
1142                         if (invert)
1143                                 ip.invflags |= IPT_INV_VIA_OUT;
1144
1145                         break;
1146
1147                 case 's':
1148                         if (!inet_pton(AF_INET, optarg, &src))
1149                                 break;
1150
1151                         ip.src = src;
1152                         inet_pton(AF_INET, "255.255.255.255", &ip.smsk);
1153
1154                         if (invert)
1155                                 ip.invflags |= IPT_INV_SRCIP;
1156
1157                         break;
1158
1159                 case 't':
1160                         table_name = optarg;
1161                         break;
1162
1163                 case 1:
1164                         if (optarg[0] == '!' && optarg[1] == '\0') {
1165                                 invert = TRUE;
1166                                 optarg[0] = '\0';
1167                                 continue;
1168                         }
1169
1170                         connman_error("Invalid option");
1171
1172                         ret = -EINVAL;
1173                         goto out;
1174
1175                 default:
1176                         if (xt_t == NULL || xt_t->parse == NULL ||
1177                             !xt_t->parse(c - xt_t->option_offset, argv, invert,
1178                                         &xt_t->tflags, NULL, &xt_t->t)) {
1179                                 if (xt_m == NULL || xt_m->parse == NULL)
1180                                         break;
1181
1182                                 xt_m->parse(c - xt_m->option_offset, argv,
1183                                         invert, &xt_m->mflags, NULL, &xt_m->m);
1184                         }
1185
1186                         break;
1187                 }
1188
1189                 invert = FALSE;
1190         }
1191
1192         if (table_name == NULL)
1193                 table_name = "filter";
1194
1195         table = iptables_init(table_name);
1196         if (table == NULL) {
1197                 ret = -EINVAL;
1198                 goto out;
1199         }
1200
1201         if (dump) {
1202                 iptables_dump(table);
1203
1204                 ret = 0;
1205                 goto out;
1206         }
1207
1208         if (flush_chain) {
1209                 DBG("Flush chain %s", flush_chain);
1210
1211                 iptables_flush_chain(table, flush_chain);
1212
1213                 goto out;
1214         }
1215
1216         if (chain && new_chain) {
1217                 ret = -EINVAL;
1218                 goto out;
1219         }
1220
1221         if (new_chain) {
1222                 DBG("New chain %s", new_chain);
1223
1224                 ret = iptables_add_chain(table, new_chain);
1225                 goto out;
1226         }
1227
1228         if (chain) {
1229                 if (target_name == NULL)
1230                         return -1;
1231
1232                 DBG("Adding %s to %s (match %s)",
1233                                 target_name, chain, match_name);
1234
1235                 ret = iptables_add_rule(table, &ip, chain, target_name, xt_t,
1236                                         match_name, xt_m);
1237
1238                 goto out;
1239         }
1240
1241 out:
1242         if (xt_t)
1243                 g_free(xt_t->t);
1244
1245         if (xt_m)
1246                 g_free(xt_m->m);
1247
1248         return ret;
1249 }
1250
1251 int __connman_iptables_command(const char *format, ...)
1252 {
1253         char **argv, **arguments, *command;
1254         int argc, i, ret;
1255         va_list args;
1256
1257         if (format == NULL)
1258                 return -EINVAL;
1259
1260         va_start(args, format);
1261
1262         command = g_strdup_vprintf(format, args);
1263
1264         va_end(args);
1265
1266         if (command == NULL)
1267                 return -ENOMEM;
1268
1269         arguments = g_strsplit_set(command, " ", -1);
1270
1271         for (argc = 0; arguments[argc]; argc++);
1272         ++argc;
1273
1274         DBG("command %s argc %d", command, argc);
1275
1276         argv = g_try_malloc0(argc * sizeof(char *));
1277         if (argv == NULL) {
1278                 g_free(command);
1279                 g_strfreev(arguments);
1280                 return -ENOMEM;
1281         }
1282
1283         argv[0] = "iptables";
1284         for (i = 1; i < argc; i++)
1285                 argv[i] = arguments[i - 1];
1286
1287         ret = iptables_command(argc, argv);
1288
1289         g_free(command);
1290         g_strfreev(arguments);
1291         g_free(argv);
1292
1293         return ret;
1294 }
1295
1296
1297 int __connman_iptables_commit(const char *table_name)
1298 {
1299         struct connman_iptables *table;
1300         struct ipt_replace *repl;
1301         int err;
1302
1303         DBG("%s", table_name);
1304
1305         table = g_hash_table_lookup(table_hash, table_name);
1306         if (table == NULL)
1307                 return -EINVAL;
1308
1309         repl = iptables_blob(table);
1310
1311         err = iptables_replace(table, repl);
1312
1313         g_free(repl->counters);
1314         g_free(repl);
1315
1316         if (err < 0)
1317             return err;
1318
1319         g_hash_table_remove(table_hash, table_name);
1320
1321         return 0;
1322 }
1323
1324 static void remove_table(gpointer user_data)
1325 {
1326         struct connman_iptables *table = user_data;
1327
1328         table_cleanup(table);
1329 }
1330
1331 int __connman_iptables_init(void)
1332 {
1333         DBG("");
1334
1335         table_hash = g_hash_table_new_full(g_str_hash, g_str_equal,
1336                                                 g_free, remove_table);
1337
1338         xtables_init_all(&iptables_globals, NFPROTO_IPV4);
1339
1340         return 0;
1341
1342 }
1343
1344 void __connman_iptables_cleanup(void)
1345 {
1346         DBG("");
1347
1348         g_hash_table_destroy(table_hash);
1349
1350         xtables_free_opts(1);
1351 }