src/iptables.c

   1 /*
   2  *
   3  *  Connection Manager
   4  *
   5  *  Copyright (C) 2007-2010  Intel Corporation. All rights reserved.
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License version 2 as
   9  *  published by the Free Software Foundation.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  *
  20  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <getopt.h>
  27 #include <stdlib.h>
  28 #include <stdio.h>
  29 #include <string.h>
  30 #include <unistd.h>
  31 #include <sys/errno.h>
  32 #include <sys/socket.h>
  33 #include <xtables.h>
  34
  35 #include <linux/netfilter_ipv4/ip_tables.h>
  36
  37 #include "connman.h"
  38
  39
  40 static const char *hooknames[] = {
  41         [NF_IP_PRE_ROUTING]     = "PREROUTING",
  42         [NF_IP_LOCAL_IN]        = "INPUT",
  43         [NF_IP_FORWARD]         = "FORWARD",
  44         [NF_IP_LOCAL_OUT]       = "OUTPUT",
  45         [NF_IP_POST_ROUTING]    = "POSTROUTING",
  46 };
  47
  48 #define LABEL_ACCEPT  "ACCEPT"
  49 #define LABEL_DROP    "DROP"
  50 #define LABEL_QUEUE   "QUEUE"
  51 #define LABEL_RETURN  "RETURN"
  52
  53 /* fn returns 0 to continue iteration */
  54 #define _XT_ENTRY_ITERATE_CONTINUE(type, entries, size, n, fn, args...) \
  55 ({                                                              \
  56         unsigned int __i;                                       \
  57         int __n;                                                \
  58         int __ret = 0;                                          \
  59         type *__entry;                                          \
  60                                                                 \
  61         for (__i = 0, __n = 0; __i < (size);                    \
  62              __i += __entry->next_offset, __n++) {              \
  63                 __entry = (void *)(entries) + __i;              \
  64                 if (__n < n)                                    \
  65                         continue;                               \
  66                                                                 \
  67                 __ret = fn(__entry,  ## args);                  \
  68                 if (__ret != 0)                                 \
  69                         break;                                  \
  70         }                                                       \
  71         __ret;                                                  \
  72 })
  73
  74 /* fn returns 0 to continue iteration */
  75 #define _XT_ENTRY_ITERATE(type, entries, size, fn, args...) \
  76         _XT_ENTRY_ITERATE_CONTINUE(type, entries, size, 0, fn, args)
  77
  78 #define ENTRY_ITERATE(entries, size, fn, args...) \
  79         _XT_ENTRY_ITERATE(struct ipt_entry, entries, size, fn, ## args)
  80
  81 #define MIN_ALIGN (__alignof__(struct ipt_entry))
  82
  83 #define ALIGN(s) (((s) + ((MIN_ALIGN)-1)) & ~((MIN_ALIGN)-1))
  84
  85 struct ipt_error_target {
  86         struct xt_entry_target t;
  87         char error[IPT_TABLE_MAXNAMELEN];
  88 };
  89
  90 struct connman_iptables_entry {
  91         int offset;
  92
  93         struct ipt_entry *entry;
  94 };
  95
  96 struct connman_iptables {
  97         int ipt_sock;
  98
  99         struct ipt_getinfo *info;
 100         struct ipt_get_entries *blob_entries;
 101
 102         unsigned int num_entries;
 103         unsigned int old_entries;
 104         unsigned int size;
 105
 106         GList *entries;
 107 };
 108
 109 static GHashTable *table_hash = NULL;
 110
 111 static struct ipt_entry *get_entry(struct connman_iptables *table,
 112                                         unsigned int offset)
 113 {
 114         return (struct ipt_entry *)((char *)table->blob_entries->entrytable +
 115                                                                         offset);
 116 }
 117
 118 static int is_hook_entry(struct connman_iptables *table,
 119                                 struct ipt_entry *entry)
 120 {
 121         unsigned int i;
 122
 123         for (i = 0; i < NF_INET_NUMHOOKS; i++) {
 124                 if ((table->info->valid_hooks & (1 << i))
 125                 && get_entry(table, table->info->hook_entry[i]) == entry)
 126                         return i;
 127         }
 128
 129         return -1;
 130 }
 131
 132 static unsigned long entry_to_offset(struct connman_iptables *table,
 133                                         struct ipt_entry *entry)
 134 {
 135         return (void *)entry - (void *)table->blob_entries->entrytable;
 136 }
 137
 138 static int target_to_verdict(char *target_name)
 139 {
 140         if (!strcmp(target_name, LABEL_ACCEPT))
 141                 return -NF_ACCEPT - 1;
 142
 143         if (!strcmp(target_name, LABEL_DROP))
 144                 return -NF_DROP - 1;
 145
 146         if (!strcmp(target_name, LABEL_QUEUE))
 147                 return -NF_QUEUE - 1;
 148
 149         if (!strcmp(target_name, LABEL_RETURN))
 150                 return XT_RETURN;
 151
 152         return 0;
 153 }
 154
 155 static gboolean is_builtin_target(char *target_name)
 156 {
 157         if (!strcmp(target_name, LABEL_ACCEPT) ||
 158                 !strcmp(target_name, LABEL_DROP) ||
 159                 !strcmp(target_name, LABEL_QUEUE) ||
 160                 !strcmp(target_name, LABEL_RETURN))
 161                 return TRUE;
 162
 163         return FALSE;
 164 }
 165
 166 static gboolean is_jump(struct connman_iptables_entry *e)
 167 {
 168         struct xt_entry_target *target;
 169
 170         target = ipt_get_target(e->entry);
 171
 172         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
 173                 struct xt_standard_target *t;
 174
 175                 t = (struct xt_standard_target *)target;
 176
 177                 switch (t->verdict) {
 178                 case XT_RETURN:
 179                 case -NF_ACCEPT - 1:
 180                 case -NF_DROP - 1:
 181                 case -NF_QUEUE - 1:
 182                 case -NF_STOP - 1:
 183                         return false;
 184
 185                 default:
 186                         return true;
 187                 }
 188         }
 189
 190         return false;
 191 }
 192
 193 static gboolean is_chain(struct connman_iptables *table,
 194                                 struct connman_iptables_entry *e)
 195 {
 196         int builtin;
 197         struct ipt_entry *entry;
 198         struct xt_entry_target *target;
 199
 200         entry = e->entry;
 201         builtin = is_hook_entry(table, entry);
 202         if (builtin >= 0)
 203                 return TRUE;
 204
 205         target = ipt_get_target(entry);
 206         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET))
 207                 return TRUE;
 208
 209         return FALSE;
 210 }
 211
 212 static GList *find_chain_head(struct connman_iptables *table,
 213                                 char *chain_name)
 214 {
 215         GList *list;
 216         struct connman_iptables_entry *head;
 217         struct ipt_entry *entry;
 218         struct xt_entry_target *target;
 219         int builtin;
 220
 221         for (list = table->entries; list; list = list->next) {
 222                 head = list->data;
 223                 entry = head->entry;
 224
 225                 /* Buit-in chain */
 226                 builtin = is_hook_entry(table, entry);
 227                 if (builtin >= 0 && !strcmp(hooknames[builtin], chain_name))
 228                         break;
 229
 230                 /* User defined chain */
 231                 target = ipt_get_target(entry);
 232                 if (!strcmp(target->u.user.name, IPT_ERROR_TARGET) &&
 233                     !strcmp((char *)target->data, chain_name))
 234                         break;
 235         }
 236
 237         return list;
 238 }
 239
 240 static GList *find_chain_tail(struct connman_iptables *table,
 241                                 char *chain_name)
 242 {
 243         GList *chain_head, *list;
 244         struct connman_iptables_entry *head, *tail;
 245         struct ipt_entry *entry;
 246         struct xt_entry_target *target;
 247         int builtin;
 248
 249         /* First we look for the head */
 250         for (list = table->entries; list; list = list->next) {
 251                 head = list->data;
 252                 entry = head->entry;
 253
 254                 /* Buit-in chain */
 255                 builtin = is_hook_entry(table, entry);
 256                 if (builtin >= 0 && !strcmp(hooknames[builtin], chain_name))
 257                         break;
 258
 259                 /* User defined chain */
 260                 target = ipt_get_target(entry);
 261                 if (!strcmp(target->u.user.name, IPT_ERROR_TARGET) &&
 262                     !strcmp((char *)target->data, chain_name))
 263                         break;
 264         }
 265
 266         if (list == NULL)
 267                 return NULL;
 268
 269         chain_head = list;
 270
 271         /* Then we look for the next chain */
 272         for (list = chain_head->next; list; list = list->next) {
 273                 tail = list->data;
 274                 entry = tail->entry;
 275
 276                 if (is_chain(table, tail))
 277                         return list;
 278         }
 279
 280         /* Nothing found, we return the table end */
 281         return g_list_last(table->entries);
 282 }
 283
 284
 285 static void update_offsets(struct connman_iptables *table)
 286 {
 287         GList *list, *prev;
 288         struct connman_iptables_entry *entry, *prev_entry;
 289
 290         for (list = table->entries; list; list = list->next) {
 291                 entry = list->data;
 292
 293                 if (list == table->entries) {
 294                         entry->offset = 0;
 295
 296                         continue;
 297                 }
 298
 299                 prev = list->prev;
 300                 prev_entry = prev->data;
 301
 302                 entry->offset = prev_entry->offset +
 303                                         prev_entry->entry->next_offset;
 304         }
 305 }
 306
 307 static int iptables_add_entry(struct connman_iptables *table,
 308                                 struct ipt_entry *entry, GList *before)
 309 {
 310         GList *list;
 311         struct connman_iptables_entry *e, *tmp, *entry_before;
 312         struct xt_standard_target *t;
 313
 314         if (table == NULL)
 315                 return -1;
 316
 317         e = g_try_malloc0(sizeof(struct connman_iptables_entry));
 318         if (e == NULL)
 319                 return -1;
 320
 321         e->entry = entry;
 322
 323         table->entries = g_list_insert_before(table->entries, before, e);
 324         table->num_entries++;
 325         table->size += entry->next_offset;
 326
 327         if (before == NULL) {
 328                 e->offset = table->size - entry->next_offset;
 329
 330                 return 0;
 331         }
 332
 333         entry_before = before->data;
 334
 335         /*
 336          * We've just insterted a new entry. All references before it
 337          * should be bumped accordingly.
 338          */
 339         for (list = table->entries; list != before; list = list->next) {
 340                 tmp = list->data;
 341
 342                 if (!is_jump(tmp))
 343                         continue;
 344
 345                 t = (struct xt_standard_target *)ipt_get_target(tmp->entry);
 346
 347                 if (t->verdict >= entry_before->offset)
 348                         t->verdict += entry->next_offset;
 349         }
 350
 351         update_offsets(table);
 352
 353         return 0;
 354 }
 355
 356 static int iptables_add_chain(struct connman_iptables *table,
 357                                         char *name)
 358 {
 359         GList *last;
 360         struct ipt_entry *entry_head;
 361         struct ipt_entry *entry_return;
 362         struct ipt_error_target *error;
 363         struct ipt_standard_target *standard;
 364         u_int16_t entry_head_size, entry_return_size;
 365
 366         last = g_list_last(table->entries);
 367
 368         /*
 369          * An empty chain is composed of:
 370          * - A head entry, with no match and an error target.
 371          *   The error target data is the chain name.
 372          * - A tail entry, with no match and a standard target.
 373          *   The standard target verdict is XT_RETURN (return to the
 374          *   caller).
 375          */
 376
 377         /* head entry */
 378         entry_head_size = sizeof(struct ipt_entry) +
 379                                 sizeof(struct ipt_error_target);
 380         entry_head = g_try_malloc0(entry_head_size);
 381         if (entry_head == NULL)
 382                 goto err;
 383
 384         memset(entry_head, 0, entry_head_size);
 385
 386         entry_head->target_offset = sizeof(struct ipt_entry);
 387         entry_head->next_offset = entry_head_size;
 388
 389         error = (struct ipt_error_target *) entry_head->elems;
 390         strcpy(error->t.u.user.name, IPT_ERROR_TARGET);
 391         error->t.u.user.target_size = ALIGN(sizeof(struct ipt_error_target));
 392         strcpy(error->error, name);
 393
 394         if (iptables_add_entry(table, entry_head, last) < 0)
 395                 goto err;
 396
 397         /* tail entry */
 398         entry_return_size = sizeof(struct ipt_entry) +
 399                                 sizeof(struct ipt_standard_target);
 400         entry_return = g_try_malloc0(entry_return_size);
 401         if (entry_return == NULL)
 402                 goto err;
 403
 404         memset(entry_return, 0, entry_return_size);
 405
 406         entry_return->target_offset = sizeof(struct ipt_entry);
 407         entry_return->next_offset = entry_return_size;
 408
 409         standard = (struct ipt_standard_target *) entry_return->elems;
 410         standard->target.u.user.target_size =
 411                                 ALIGN(sizeof(struct ipt_standard_target));
 412         standard->verdict = XT_RETURN;
 413
 414         if (iptables_add_entry(table, entry_return, last) < 0)
 415                 goto err;
 416
 417         return 0;
 418
 419 err:
 420         g_free(entry_head);
 421         g_free(entry_return);
 422
 423         return -ENOMEM;
 424 }
 425
 426 static struct ipt_entry *
 427 new_rule(struct connman_iptables *table,
 428                 char *target_name, struct xtables_target *xt_t,
 429                 char *match_name, struct xtables_match *xt_m)
 430 {
 431         struct ipt_entry *new_entry;
 432         size_t match_size, target_size;
 433         int is_builtin = is_builtin_target(target_name);
 434
 435         if (xt_m)
 436                 match_size = xt_m->m->u.match_size;
 437         else
 438                 match_size = 0;
 439
 440         if (xt_t)
 441                 target_size = ALIGN(xt_t->t->u.target_size);
 442         else
 443                 target_size = ALIGN(sizeof(struct xt_standard_target));
 444
 445         new_entry = g_try_malloc0(sizeof(struct ipt_entry) + target_size +
 446                                                                 match_size);
 447         if (new_entry == NULL)
 448                 return NULL;
 449
 450         new_entry->target_offset = sizeof(struct ipt_entry) + match_size;
 451         new_entry->next_offset = sizeof(struct ipt_entry) + target_size +
 452                                                                 match_size;
 453         if (xt_m) {
 454                 struct xt_entry_match *entry_match;
 455
 456                 entry_match = (struct xt_entry_match *)new_entry->elems;
 457                 memcpy(entry_match, xt_m->m, match_size);
 458         }
 459
 460         if (xt_t) {
 461                 struct xt_entry_target *entry_target;
 462
 463                 if (is_builtin) {
 464                         struct xt_standard_target *target;
 465
 466                         target = (struct xt_standard_target *)(xt_t->t);
 467                         strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
 468                         target->verdict = target_to_verdict(target_name);
 469                 }
 470
 471                 entry_target = ipt_get_target(new_entry);
 472                 memcpy(entry_target, xt_t->t, target_size);
 473         } else {
 474                 struct connman_iptables_entry *target_rule;
 475                 struct xt_standard_target *target;
 476                 GList *chain_head;
 477
 478                 /*
 479                  * This is a user defined target, i.e. a chain jump.
 480                  * We search for the chain head, and the target verdict
 481                  * is the first rule's offset on this chain.
 482                  * The offset is from the beginning of the table.
 483                  */
 484
 485                 chain_head = find_chain_head(table, target_name);
 486                 if (chain_head == NULL || chain_head->next == NULL) {
 487                         g_free(new_entry);
 488                         return NULL;
 489                 }
 490
 491                 target_rule = chain_head->next->data;
 492
 493                 target = (struct xt_standard_target *)ipt_get_target(new_entry);
 494                 strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
 495                 target->target.u.user.target_size = target_size;
 496                 target->verdict = target_rule->offset;
 497         }
 498
 499         return new_entry;
 500 }
 501
 502 static int
 503 iptables_add_rule(struct connman_iptables *table, char *chain_name,
 504                                 char *target_name, struct xtables_target *xt_t,
 505                                 char *match_name, struct xtables_match *xt_m)
 506 {
 507         GList *chain_tail;
 508         struct ipt_entry *new_entry;
 509
 510         chain_tail = find_chain_tail(table, chain_name);
 511         if (chain_tail == NULL)
 512                 return -EINVAL;
 513
 514         new_entry = new_rule(table,
 515                                 target_name, xt_t,
 516                                 match_name, xt_m);
 517         if (new_entry == NULL)
 518                 return -EINVAL;
 519
 520         return iptables_add_entry(table, new_entry, chain_tail->prev);
 521 }
 522
 523 static struct ipt_replace *
 524 iptables_blob(struct connman_iptables *table)
 525 {
 526         struct ipt_replace *r;
 527         GList *list;
 528         struct connman_iptables_entry *e;
 529         unsigned char *entry_index;
 530
 531         r = g_try_malloc0(sizeof(struct ipt_replace) + table->size);
 532         if (r == NULL)
 533                 return NULL;
 534
 535         memset(r, 0, sizeof(*r) + table->size);
 536
 537         r->counters = g_try_malloc0(sizeof(struct xt_counters)
 538                                 * table->num_entries);
 539         if (r->counters == NULL) {
 540                 g_free(r);
 541                 return NULL;
 542         }
 543
 544         strcpy(r->name, table->info->name);
 545         r->num_entries = table->num_entries;
 546         r->size = table->size;
 547
 548         r->num_counters = table->old_entries;
 549         r->valid_hooks  = table->info->valid_hooks;
 550
 551         memcpy(r->hook_entry, table->info->hook_entry,
 552                                 sizeof(table->info->hook_entry));
 553         memcpy(r->underflow, table->info->underflow,
 554                                 sizeof(table->info->underflow));
 555
 556         entry_index = (unsigned char *)r->entries;
 557         for (list = table->entries; list; list = list->next) {
 558                 e = list->data;
 559
 560                 memcpy(entry_index, e->entry, e->entry->next_offset);
 561                 entry_index += e->entry->next_offset;
 562         }
 563
 564         return r;
 565 }
 566
 567 static void dump_ip(struct ipt_entry *entry)
 568 {
 569         struct ipt_ip *ip = &entry->ip;
 570
 571         if (strlen(ip->iniface))
 572                 connman_info("\tin %s", ip->iniface);
 573
 574         if (strlen(ip->outiface))
 575                 connman_info("\tout %s", ip->outiface);
 576 }
 577
 578 static void dump_target(struct connman_iptables *table,
 579                                 struct ipt_entry *entry)
 580
 581 {
 582         struct xtables_target *xt_t;
 583         struct xt_entry_target *target;
 584
 585         target = ipt_get_target(entry);
 586
 587         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
 588                 struct xt_standard_target *t;
 589
 590                 t = (struct xt_standard_target *)target;
 591
 592                 switch (t->verdict) {
 593                 case XT_RETURN:
 594                         connman_info("\ttarget RETURN");
 595                         break;
 596
 597                 case -NF_ACCEPT - 1:
 598                         connman_info("\ttarget ACCEPT");
 599                         break;
 600
 601                 case -NF_DROP - 1:
 602                         connman_info("\ttarget DROP");
 603                         break;
 604
 605                 case -NF_QUEUE - 1:
 606                         connman_info("\ttarget QUEUE");
 607                         break;
 608
 609                 case -NF_STOP - 1:
 610                         connman_info("\ttarget STOP");
 611                         break;
 612
 613                 default:
 614                         connman_info("\tJUMP @%p (0x%x)",
 615                                 (char*)table->blob_entries->entrytable +
 616                                 t->verdict, t->verdict);
 617                         break;
 618                 }
 619
 620                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
 621                                                 XTF_LOAD_MUST_SUCCEED);
 622
 623                 if(xt_t->print != NULL)
 624                         xt_t->print(NULL, target, 1);
 625         } else {
 626                 xt_t = xtables_find_target(target->u.user.name, XTF_TRY_LOAD);
 627                 if (xt_t == NULL) {
 628                         connman_info("\ttarget %s", target->u.user.name);
 629                         return;
 630                 }
 631
 632                 if(xt_t->print != NULL) {
 633                         connman_info("\ttarget ");
 634                         xt_t->print(NULL, target, 1);
 635                 }
 636         }
 637 }
 638
 639 static void dump_match(struct connman_iptables *table, struct ipt_entry *entry)
 640 {
 641         struct xtables_match *xt_m;
 642         struct xt_entry_match *match;
 643
 644         if (entry->elems == (unsigned char *)entry + entry->target_offset)
 645                 return;
 646
 647         match = (struct xt_entry_match *) entry->elems;
 648
 649         if (!strlen(match->u.user.name))
 650                 return;
 651
 652         xt_m = xtables_find_match(match->u.user.name, XTF_TRY_LOAD, NULL);
 653         if (xt_m == NULL)
 654                 goto out;
 655
 656         if(xt_m->print != NULL) {
 657                 connman_info("\tmatch ");
 658                 xt_m->print(NULL, match, 1);
 659
 660                 return;
 661         }
 662
 663 out:
 664         connman_info("\tmatch %s", match->u.user.name);
 665
 666 }
 667
 668 static int dump_entry(struct ipt_entry *entry,
 669                                 struct connman_iptables *table)
 670 {
 671         struct xt_entry_target *target;
 672         unsigned int offset;
 673         int builtin;
 674
 675         offset = (char *)entry - (char *)table->blob_entries->entrytable;
 676         target = ipt_get_target(entry);
 677         builtin = is_hook_entry(table, entry);
 678
 679         if (entry_to_offset(table, entry) + entry->next_offset ==
 680                                         table->blob_entries->size) {
 681                 connman_info("End of CHAIN 0x%x", offset);
 682                 return 0;
 683         }
 684
 685         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET)) {
 686                 connman_info("USER CHAIN (%s) %p  match %p  target %p  size %d",
 687                         target->data, entry, entry->elems,
 688                         (char *)entry + entry->target_offset,
 689                                 entry->next_offset);
 690
 691                 return 0;
 692         } else if (builtin >= 0) {
 693                 connman_info("CHAIN (%s) %p  match %p  target %p  size %d",
 694                         hooknames[builtin], entry, entry->elems,
 695                         (char *)entry + entry->target_offset,
 696                                 entry->next_offset);
 697         } else {
 698                 connman_info("RULE %p  match %p  target %p  size %d", entry,
 699                         entry->elems,
 700                         (char *)entry + entry->target_offset,
 701                                 entry->next_offset);
 702         }
 703
 704         dump_match(table, entry);
 705         dump_target(table, entry);
 706         dump_ip(entry);
 707
 708         return 0;
 709 }
 710
 711 static void iptables_dump(struct connman_iptables *table)
 712 {
 713         connman_info("%s valid_hooks=0x%08x, num_entries=%u, size=%u",
 714                         table->info->name,
 715                         table->info->valid_hooks, table->info->num_entries,
 716                                 table->info->size);
 717
 718         ENTRY_ITERATE(table->blob_entries->entrytable,
 719                         table->blob_entries->size,
 720                         dump_entry, table);
 721
 722 }
 723
 724 static int iptables_get_entries(struct connman_iptables *table)
 725 {
 726         socklen_t entry_size;
 727
 728         entry_size = sizeof(struct ipt_get_entries) + table->info->size;
 729
 730         return getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_ENTRIES,
 731                                 table->blob_entries, &entry_size);
 732 }
 733
 734 static int iptables_replace(struct connman_iptables *table,
 735                                         struct ipt_replace *r)
 736 {
 737         return setsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_SET_REPLACE, r,
 738                          sizeof(*r) + r->size);
 739 }
 740
 741 static int add_entry(struct ipt_entry *entry, struct connman_iptables *table)
 742 {
 743         struct ipt_entry *new_entry;
 744
 745         new_entry = g_try_malloc0(entry->next_offset);
 746         if (new_entry == NULL)
 747                 return -ENOMEM;
 748
 749         memcpy(new_entry, entry, entry->next_offset);
 750
 751         return iptables_add_entry(table, new_entry, NULL);
 752 }
 753
 754 static void table_cleanup(struct connman_iptables *table)
 755 {
 756         GList *list;
 757         struct connman_iptables_entry *entry;
 758
 759         close(table->ipt_sock);
 760
 761         for (list = table->entries; list; list = list->next) {
 762                 entry = list->data;
 763
 764                 g_free(entry->entry);
 765         }
 766
 767         g_list_free(table->entries);
 768         g_free(table->info);
 769         g_free(table->blob_entries);
 770         g_free(table);
 771 }
 772
 773 static struct connman_iptables *iptables_init(char *table_name)
 774 {
 775         struct connman_iptables *table;
 776         socklen_t s;
 777
 778         table = g_hash_table_lookup(table_hash, table_name);
 779         if (table != NULL)
 780                 return table;
 781
 782         table = g_try_new0(struct connman_iptables, 1);
 783         if (table == NULL)
 784                 return NULL;
 785
 786         table->info = g_try_new0(struct ipt_getinfo, 1);
 787         if (table->info == NULL)
 788                 goto err;
 789
 790         table->ipt_sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
 791         if (table->ipt_sock < 0)
 792                 goto err;
 793
 794         s = sizeof(*table->info);
 795         strcpy(table->info->name, table_name);
 796         if (getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_INFO,
 797                                                 table->info, &s) < 0)
 798                 goto err;
 799
 800         table->blob_entries = g_try_malloc0(sizeof(struct ipt_get_entries) +
 801                                                 table->info->size);
 802         if (table->blob_entries == NULL)
 803                 goto err;
 804
 805         strcpy(table->blob_entries->name, table_name);
 806         table->blob_entries->size = table->info->size;
 807
 808         if (iptables_get_entries(table) < 0)
 809                 goto err;
 810
 811         table->num_entries = 0;
 812         table->old_entries = table->info->num_entries;
 813         table->size = 0;
 814
 815         ENTRY_ITERATE(table->blob_entries->entrytable,
 816                         table->blob_entries->size,
 817                                 add_entry, table);
 818
 819         g_hash_table_insert(table_hash, table_name, table);
 820
 821         return table;
 822
 823 err:
 824
 825         table_cleanup(table);
 826
 827         return NULL;
 828 }
 829
 830 static struct option iptables_opts[] = {
 831         {.name = "append",        .has_arg = 1, .val = 'A'},
 832         {.name = "list",          .has_arg = 2, .val = 'L'},
 833         {.name = "new-chain",     .has_arg = 1, .val = 'N'},
 834         {.name = "in-interface",  .has_arg = 1, .val = 'i'},
 835         {.name = "jump",          .has_arg = 1, .val = 'j'},
 836         {.name = "match",         .has_arg = 1, .val = 'm'},
 837         {.name = "out-interface", .has_arg = 1, .val = 'o'},
 838         {.name = "table",         .has_arg = 1, .val = 't'},
 839         {NULL},
 840 };
 841
 842 struct xtables_globals iptables_globals = {
 843         .option_offset = 0,
 844         .opts = iptables_opts,
 845         .orig_opts = iptables_opts,
 846 };
 847
 848 static int iptables_command(int argc, char *argv[])
 849 {
 850         struct connman_iptables *table;
 851         struct xtables_match *xt_m;
 852         struct xtables_target *xt_t;
 853         char *table_name, *chain, *new_chain, *match_name, *target_name;
 854         int c, ret;
 855         size_t size;
 856         gboolean dump, invert;
 857
 858         if (argc == 0)
 859                 return -EINVAL;
 860
 861         dump = FALSE;
 862         invert = FALSE;
 863         table_name = chain = new_chain = match_name = target_name = NULL;
 864         table = NULL;
 865         xt_m = NULL;
 866         xt_t = NULL;
 867         ret = 0;
 868
 869         optind = 0;
 870
 871         while ((c = getopt_long(argc, argv,
 872            "-A:L::N:j:i:m:o:t:", iptables_globals.opts, NULL)) != -1) {
 873                 switch (c) {
 874                 case 'A':
 875                         chain = optarg;
 876                         break;
 877
 878                 case 'L':
 879                         dump = TRUE;
 880                         break;
 881
 882                 case 'N':
 883                         new_chain = optarg;
 884                         break;
 885
 886                 case 'j':
 887                         target_name = optarg;
 888                         xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
 889
 890                         if (xt_t == NULL)
 891                                 break;
 892
 893                         size = ALIGN(sizeof(struct ipt_entry_target)) +
 894                                                                 xt_t->size;
 895
 896                         xt_t->t = g_try_malloc0(size);
 897                         if (xt_t->t == NULL)
 898                                 goto out;
 899                         xt_t->t->u.target_size = size;
 900                         strcpy(xt_t->t->u.user.name, target_name);
 901                         xt_t->t->u.user.revision = xt_t->revision;
 902                         if (xt_t->init != NULL)
 903                                 xt_t->init(xt_t->t);
 904                         iptables_globals.opts =
 905                                 xtables_merge_options(iptables_globals.opts,
 906                                                      xt_t->extra_opts,
 907                                                      &xt_t->option_offset);
 908                         if (iptables_globals.opts == NULL)
 909                                 goto out;
 910
 911                         break;
 912
 913                 case 'i':
 914                         break;
 915
 916                 case 'm':
 917                         match_name = optarg;
 918
 919                         xt_m = xtables_find_match(optarg, XTF_LOAD_MUST_SUCCEED, NULL);
 920                         size = ALIGN(sizeof(struct ipt_entry_match)) +
 921                                                                 xt_m->size;
 922                         xt_m->m = g_try_malloc0(size);
 923                         if (xt_m == NULL)
 924                                 goto out;
 925                         xt_m->m->u.match_size = size;
 926                         strcpy(xt_m->m->u.user.name, xt_m->name);
 927                         xt_m->m->u.user.revision = xt_m->revision;
 928                         if (xt_m->init != NULL)
 929                                 xt_m->init(xt_m->m);
 930                         if (xt_m != xt_m->next) {
 931                                 iptables_globals.opts =
 932                                 xtables_merge_options(iptables_globals.opts,
 933                                                 xt_m->extra_opts,
 934                                                 &xt_m->option_offset);
 935                                 if (iptables_globals.opts == NULL)
 936                                         goto out;
 937                         }
 938
 939                         break;
 940
 941                 case 'o':
 942                         break;
 943
 944                 case 't':
 945                         table_name = optarg;
 946                         break;
 947
 948                 case 1:
 949                         if (optarg[0] == '!' && optarg[1] == '\0') {
 950                                 invert = TRUE;
 951                                 optarg[0] = '\0';
 952                                 continue;
 953                         }
 954
 955                         connman_error("Invalid option");
 956
 957                         ret = -EINVAL;
 958                         goto out;
 959
 960                 default:
 961                         if (xt_t == NULL || xt_t->parse == NULL ||
 962                             !xt_t->parse(c - xt_t->option_offset, argv, invert,
 963                                         &xt_t->tflags, NULL, &xt_t->t)) {
 964                                 if (xt_m == NULL || xt_m->parse == NULL)
 965                                         break;
 966
 967                                 xt_m->parse(c - xt_m->option_offset, argv,
 968                                         invert, &xt_m->mflags, NULL, &xt_m->m);
 969                         }
 970
 971                         break;
 972                 }
 973         }
 974
 975         if (table_name == NULL)
 976                 table_name = "filter";
 977
 978         table = iptables_init(table_name);
 979         if (table == NULL) {
 980                 ret = -EINVAL;
 981                 goto out;
 982         }
 983
 984         if (dump) {
 985                 iptables_dump(table);
 986
 987                 ret = 0;
 988                 goto out;
 989         }
 990
 991         if (chain && new_chain) {
 992                 ret = -EINVAL;
 993                 goto out;
 994         }
 995
 996         if (new_chain) {
 997                 DBG("New chain %s", new_chain);
 998
 999                 ret = iptables_add_chain(table, new_chain);
1000                 goto out;
1001         }
1002
1003         if (chain) {
1004                 if (target_name == NULL)
1005                         return -1;
1006
1007                 DBG("Adding %s to %s (match %s)",
1008                                 target_name, chain, match_name);
1009
1010                 ret = iptables_add_rule(table, chain, target_name, xt_t,
1011                                         match_name, xt_m);
1012
1013                 goto out;
1014         }
1015
1016 out:
1017         if (xt_t)
1018                 g_free(xt_t->t);
1019
1020         if (xt_m)
1021                 g_free(xt_m->m);
1022
1023         return ret;
1024 }
1025
1026 int __connman_iptables_command(const char *format, ...)
1027 {
1028         char **argv, **arguments, *command;
1029         int argc, i, ret;
1030         va_list args;
1031
1032         if (format == NULL)
1033                 return -EINVAL;
1034
1035         va_start(args, format);
1036
1037         command = g_strdup_vprintf(format, args);
1038
1039         va_end(args);
1040
1041         if (command == NULL)
1042                 return -ENOMEM;
1043
1044         arguments = g_strsplit_set(command, " ", -1);
1045
1046         for (argc = 0; arguments[argc]; argc++);
1047
1048         DBG("command %s argc %d", command, ++argc);
1049
1050         argv = g_try_malloc0(argc * sizeof(char *));
1051         if (argv == NULL) {
1052                 g_free(command);
1053                 g_strfreev(arguments);
1054                 return -ENOMEM;
1055         }
1056
1057         argv[0] = "iptables";
1058         for (i = 1; i < argc; i++)
1059                 argv[i] = arguments[i - 1];
1060
1061         ret = iptables_command(argc, argv);
1062
1063         g_free(command);
1064         g_strfreev(arguments);
1065         g_free(argv);
1066
1067         return ret;
1068 }
1069
1070
1071 int __connman_iptables_commit(const char *table_name)
1072 {
1073         struct connman_iptables *table;
1074         struct ipt_replace *repl;
1075
1076         table = g_hash_table_lookup(table_hash, table_name);
1077         if (table == NULL)
1078                 return -EINVAL;
1079
1080         repl = iptables_blob(table);
1081
1082         return iptables_replace(table, repl);
1083 }
1084
1085 static void remove_table(gpointer user_data)
1086 {
1087         struct connman_iptables *table = user_data;
1088
1089         table_cleanup(table);
1090 }
1091
1092 int __connman_iptables_init(void)
1093 {
1094         DBG("");
1095
1096         table_hash = g_hash_table_new_full(g_str_hash, g_str_equal,
1097                                                 NULL, remove_table);
1098
1099         xtables_init_all(&iptables_globals, NFPROTO_IPV4);
1100
1101         return 0;
1102
1103 }
1104
1105 void __connman_iptables_cleanup(void)
1106 {
1107         g_hash_table_destroy(table_hash);
1108
1109         xtables_free_opts(1);
1110 }