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