tools/iptables-test.c

   1 /*
   2  *  Connection Manager
   3  *
   4  *  Copyright (C) 2007-2010  Intel Corporation. All rights reserved.
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License version 2 as
   8  *  published by the Free Software Foundation.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  18  *
  19  */
  20
  21 #include <getopt.h>
  22 #include <stdlib.h>
  23 #include <stdio.h>
  24 #include <string.h>
  25 #include <unistd.h>
  26 #include <sys/errno.h>
  27 #include <sys/socket.h>
  28 #include <sys/types.h>
  29 #include <arpa/inet.h>
  30 #include <xtables.h>
  31
  32 #include <linux/netfilter_ipv4/ip_tables.h>
  33
  34 #include <glib.h>
  35
  36 static const char *hooknames[] = {
  37         [NF_IP_PRE_ROUTING]     = "PREROUTING",
  38         [NF_IP_LOCAL_IN]        = "INPUT",
  39         [NF_IP_FORWARD]         = "FORWARD",
  40         [NF_IP_LOCAL_OUT]       = "OUTPUT",
  41         [NF_IP_POST_ROUTING]    = "POSTROUTING",
  42 };
  43
  44 #define LABEL_ACCEPT  "ACCEPT"
  45 #define LABEL_DROP    "DROP"
  46 #define LABEL_QUEUE   "QUEUE"
  47 #define LABEL_RETURN  "RETURN"
  48
  49 /* fn returns 0 to continue iteration */
  50 #define _XT_ENTRY_ITERATE_CONTINUE(type, entries, size, n, fn, args...) \
  51 ({                                                              \
  52         unsigned int __i;                                       \
  53         int __n;                                                \
  54         int __ret = 0;                                          \
  55         type *__entry;                                          \
  56                                                                 \
  57         for (__i = 0, __n = 0; __i < (size);                    \
  58              __i += __entry->next_offset, __n++) {              \
  59                 __entry = (void *)(entries) + __i;              \
  60                 if (__n < n)                                    \
  61                         continue;                               \
  62                                                                 \
  63                 __ret = fn(__entry,  ## args);                  \
  64                 if (__ret != 0)                                 \
  65                         break;                                  \
  66         }                                                       \
  67         __ret;                                                  \
  68 })
  69
  70 /* fn returns 0 to continue iteration */
  71 #define _XT_ENTRY_ITERATE(type, entries, size, fn, args...) \
  72         _XT_ENTRY_ITERATE_CONTINUE(type, entries, size, 0, fn, args)
  73
  74 #define ENTRY_ITERATE(entries, size, fn, args...) \
  75         _XT_ENTRY_ITERATE(struct ipt_entry, entries, size, fn, ## args)
  76
  77 #define MIN_ALIGN (__alignof__(struct ipt_entry))
  78
  79 #define ALIGN(s) (((s) + ((MIN_ALIGN)-1)) & ~((MIN_ALIGN)-1))
  80
  81 struct error_target {
  82         struct xt_entry_target t;
  83         char error[IPT_TABLE_MAXNAMELEN];
  84 };
  85
  86 struct connman_iptables_entry {
  87         int offset;
  88         int builtin;
  89
  90         struct ipt_entry *entry;
  91 };
  92
  93 struct connman_iptables {
  94         int ipt_sock;
  95
  96         struct ipt_getinfo *info;
  97         struct ipt_get_entries *blob_entries;
  98
  99         unsigned int num_entries;
 100         unsigned int old_entries;
 101         unsigned int size;
 102
 103         unsigned int underflow[NF_INET_NUMHOOKS];
 104         unsigned int hook_entry[NF_INET_NUMHOOKS];
 105
 106         GList *entries;
 107 };
 108
 109
 110 static struct ipt_entry *get_entry(struct connman_iptables *table,
 111                                         unsigned int offset)
 112 {
 113         return (struct ipt_entry *)((char *)table->blob_entries->entrytable +
 114                                                                         offset);
 115 }
 116
 117 static int is_hook_entry(struct connman_iptables *table,
 118                                 struct ipt_entry *entry)
 119 {
 120         unsigned int i;
 121
 122         for (i = 0; i < NF_INET_NUMHOOKS; i++) {
 123                 if ((table->info->valid_hooks & (1 << i))
 124                 && get_entry(table, table->info->hook_entry[i]) == entry)
 125                         return i;
 126         }
 127
 128         return -1;
 129 }
 130
 131 static unsigned long entry_to_offset(struct connman_iptables *table,
 132                                         struct ipt_entry *entry)
 133 {
 134         return (void *)entry - (void *)table->blob_entries->entrytable;
 135 }
 136
 137 static int target_to_verdict(char *target_name)
 138 {
 139         if (!strcmp(target_name, LABEL_ACCEPT))
 140                 return -NF_ACCEPT - 1;
 141
 142         if (!strcmp(target_name, LABEL_DROP))
 143                 return -NF_DROP - 1;
 144
 145         if (!strcmp(target_name, LABEL_QUEUE))
 146                 return -NF_QUEUE - 1;
 147
 148         if (!strcmp(target_name, LABEL_RETURN))
 149                 return XT_RETURN;
 150
 151         return 0;
 152 }
 153
 154 static gboolean is_builtin_target(char *target_name)
 155 {
 156         if (!strcmp(target_name, LABEL_ACCEPT) ||
 157                 !strcmp(target_name, LABEL_DROP) ||
 158                 !strcmp(target_name, LABEL_QUEUE) ||
 159                 !strcmp(target_name, LABEL_RETURN))
 160                 return TRUE;
 161
 162         return FALSE;
 163 }
 164
 165 static gboolean is_jump(struct connman_iptables_entry *e)
 166 {
 167         struct xt_entry_target *target;
 168
 169         target = ipt_get_target(e->entry);
 170
 171         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
 172                 struct xt_standard_target *t;
 173
 174                 t = (struct xt_standard_target *)target;
 175
 176                 switch (t->verdict) {
 177                 case XT_RETURN:
 178                 case -NF_ACCEPT - 1:
 179                 case -NF_DROP - 1:
 180                 case -NF_QUEUE - 1:
 181                 case -NF_STOP - 1:
 182                         return false;
 183
 184                 default:
 185                         return true;
 186                 }
 187         }
 188
 189         return false;
 190 }
 191
 192 static gboolean is_chain(struct connman_iptables *table,
 193                                 struct connman_iptables_entry *e)
 194 {
 195         struct ipt_entry *entry;
 196         struct xt_entry_target *target;
 197
 198         entry = e->entry;
 199         if (e->builtin >= 0)
 200                 return TRUE;
 201
 202         target = ipt_get_target(entry);
 203         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET))
 204                 return TRUE;
 205
 206         return FALSE;
 207 }
 208
 209 static GList *find_chain_head(struct connman_iptables *table,
 210                                 char *chain_name)
 211 {
 212         GList *list;
 213         struct connman_iptables_entry *head;
 214         struct ipt_entry *entry;
 215         struct xt_entry_target *target;
 216         int builtin;
 217
 218         for (list = table->entries; list; list = list->next) {
 219                 head = list->data;
 220                 entry = head->entry;
 221
 222                 /* Buit-in chain */
 223                 builtin = head->builtin;
 224                 if (builtin >= 0 && !strcmp(hooknames[builtin], chain_name))
 225                         break;
 226
 227                 /* User defined chain */
 228                 target = ipt_get_target(entry);
 229                 if (!strcmp(target->u.user.name, IPT_ERROR_TARGET) &&
 230                     !strcmp((char *)target->data, chain_name))
 231                         break;
 232         }
 233
 234         return list;
 235 }
 236
 237 static GList *find_chain_tail(struct connman_iptables *table,
 238                                 char *chain_name)
 239 {
 240         GList *chain_head, *list;
 241         struct connman_iptables_entry *tail;
 242
 243         chain_head = find_chain_head(table, chain_name);
 244         if (chain_head == NULL)
 245                 return NULL;
 246
 247         /* Then we look for the next chain */
 248         for (list = chain_head->next; list; list = list->next) {
 249                 tail = list->data;
 250
 251                 if (is_chain(table, tail))
 252                         return list;
 253         }
 254
 255         /* Nothing found, we return the table end */
 256         return g_list_last(table->entries);
 257 }
 258
 259 static void update_offsets(struct connman_iptables *table)
 260 {
 261         GList *list, *prev;
 262         struct connman_iptables_entry *entry, *prev_entry;
 263
 264         for (list = table->entries; list; list = list->next) {
 265                 entry = list->data;
 266
 267                 if (list == table->entries) {
 268                         entry->offset = 0;
 269
 270                         continue;
 271                 }
 272
 273                 prev = list->prev;
 274                 prev_entry = prev->data;
 275
 276                 entry->offset = prev_entry->offset +
 277                                         prev_entry->entry->next_offset;
 278         }
 279 }
 280
 281 static int connman_add_entry(struct connman_iptables *table,
 282                                 struct ipt_entry *entry, GList *before,
 283                                         int builtin)
 284 {
 285         GList *list;
 286         struct connman_iptables_entry *e, *tmp, *entry_before;
 287         struct xt_standard_target *t;
 288
 289         if (table == NULL)
 290                 return -1;
 291
 292         e = g_try_malloc0(sizeof(struct connman_iptables_entry));
 293         if (e == NULL)
 294                 return -1;
 295
 296         e->entry = entry;
 297         e->builtin = builtin;
 298
 299         table->entries = g_list_insert_before(table->entries, before, e);
 300         table->num_entries++;
 301         table->size += entry->next_offset;
 302
 303         if (before == NULL) {
 304                 e->offset = table->size - entry->next_offset;
 305
 306                 return 0;
 307         }
 308
 309         entry_before = before->data;
 310
 311         /*
 312          * We've just insterted a new entry. All references before it
 313          * should be bumped accordingly.
 314          */
 315         for (list = table->entries; list != before; list = list->next) {
 316                 tmp = list->data;
 317
 318                 if (!is_jump(tmp))
 319                         continue;
 320
 321                 t = (struct xt_standard_target *)ipt_get_target(tmp->entry);
 322
 323                 if (t->verdict >= entry_before->offset)
 324                         t->verdict += entry->next_offset;
 325         }
 326
 327         update_offsets(table);
 328
 329         return 0;
 330 }
 331
 332 static int remove_table_entry(struct connman_iptables *table,
 333                                         struct connman_iptables_entry *entry)
 334 {
 335         int removed = 0;
 336
 337         table->num_entries--;
 338         table->size -= entry->entry->next_offset;
 339         removed = entry->entry->next_offset;
 340
 341         g_free(entry->entry);
 342
 343         table->entries = g_list_remove(table->entries, entry);
 344
 345         return removed;
 346 }
 347
 348 static int connman_iptables_flush_chain(struct connman_iptables *table,
 349                                                 char *name)
 350 {
 351         GList *chain_head, *chain_tail, *list, *next;
 352         struct connman_iptables_entry *entry;
 353         int builtin, removed = 0;
 354
 355         chain_head = find_chain_head(table, name);
 356         if (chain_head == NULL)
 357                 return -EINVAL;
 358
 359         chain_tail = find_chain_tail(table, name);
 360         if (chain_tail == NULL)
 361                 return -EINVAL;
 362
 363         entry = chain_head->data;
 364         builtin = entry->builtin;
 365
 366         if (builtin >= 0)
 367                 list = chain_head;
 368         else
 369                 list = chain_head->next;
 370
 371         if (list == chain_tail->prev)
 372                 return 0;
 373
 374         while (list != chain_tail->prev) {
 375                 entry = list->data;
 376                 next = g_list_next(list);
 377
 378                 removed += remove_table_entry(table, entry);
 379
 380                 list = next;
 381         }
 382
 383         if (builtin >= 0) {
 384                 struct connman_iptables_entry *e;
 385
 386                 entry = list->data;
 387
 388                 entry->builtin = builtin;
 389
 390                 table->underflow[builtin] -= removed;
 391
 392                 for (list = chain_tail; list; list = list->next) {
 393                         e = list->data;
 394
 395                         builtin = e->builtin;
 396                         if (builtin < 0)
 397                                 continue;
 398
 399                         table->hook_entry[builtin] -= removed;
 400                         table->underflow[builtin] -= removed;
 401                 }
 402         }
 403
 404         update_offsets(table);
 405
 406         return 0;
 407 }
 408
 409 static int connman_iptables_delete_chain(struct connman_iptables *table,
 410                                                 char *name)
 411 {
 412         GList *chain_head, *chain_tail;
 413         struct connman_iptables_entry *entry;
 414
 415         chain_head = find_chain_head(table, name);
 416         if (chain_head == NULL)
 417                 return -EINVAL;
 418
 419         entry = chain_head->data;
 420
 421         /* We cannot remove builtin chain */
 422         if (entry->builtin >= 0)
 423                 return -EINVAL;
 424
 425         chain_tail = find_chain_tail(table, name);
 426         if (chain_tail == NULL)
 427                 return -EINVAL;
 428
 429         /* Chain must be flushed */
 430         if (chain_head->next != chain_tail->prev)
 431                 return -EINVAL;
 432
 433         remove_table_entry(table, entry);
 434
 435         entry = chain_tail->prev->data;
 436         remove_table_entry(table, entry);
 437
 438         update_offsets(table);
 439
 440         return 0;
 441 }
 442
 443 static int connman_iptables_add_chain(struct connman_iptables *table,
 444                                         char *name)
 445 {
 446         GList *last;
 447         struct ipt_entry *entry_head;
 448         struct ipt_entry *entry_return;
 449         struct error_target *error;
 450         struct ipt_standard_target *standard;
 451         u_int16_t entry_head_size, entry_return_size;
 452
 453         last = g_list_last(table->entries);
 454
 455         /*
 456          * An empty chain is composed of:
 457          * - A head entry, with no match and an error target.
 458          *   The error target data is the chain name.
 459          * - A tail entry, with no match and a standard target.
 460          *   The standard target verdict is XT_RETURN (return to the
 461          *   caller).
 462          */
 463
 464         /* head entry */
 465         entry_head_size = sizeof(struct ipt_entry) +
 466                                 sizeof(struct error_target);
 467         entry_head = g_try_malloc0(entry_head_size);
 468         if (entry_head == NULL)
 469                 goto err_head;
 470
 471         memset(entry_head, 0, entry_head_size);
 472
 473         entry_head->target_offset = sizeof(struct ipt_entry);
 474         entry_head->next_offset = entry_head_size;
 475
 476         error = (struct error_target *) entry_head->elems;
 477         strcpy(error->t.u.user.name, IPT_ERROR_TARGET);
 478         error->t.u.user.target_size = ALIGN(sizeof(struct error_target));
 479         strcpy(error->error, name);
 480
 481         if (connman_add_entry(table, entry_head, last, -1) < 0)
 482                 goto err_head;
 483
 484         /* tail entry */
 485         entry_return_size = sizeof(struct ipt_entry) +
 486                                 sizeof(struct ipt_standard_target);
 487         entry_return = g_try_malloc0(entry_return_size);
 488         if (entry_return == NULL)
 489                 goto err;
 490
 491         memset(entry_return, 0, entry_return_size);
 492
 493         entry_return->target_offset = sizeof(struct ipt_entry);
 494         entry_return->next_offset = entry_return_size;
 495
 496         standard = (struct ipt_standard_target *) entry_return->elems;
 497         standard->target.u.user.target_size =
 498                                 ALIGN(sizeof(struct ipt_standard_target));
 499         standard->verdict = XT_RETURN;
 500
 501         if (connman_add_entry(table, entry_return, last, -1) < 0)
 502                 goto err;
 503
 504         return 0;
 505
 506 err:
 507         g_free(entry_return);
 508 err_head:
 509         g_free(entry_head);
 510
 511         return -ENOMEM;
 512 }
 513
 514 static struct ipt_entry *
 515 new_rule(struct connman_iptables *table, struct ipt_ip *ip,
 516                 char *target_name, struct xtables_target *xt_t,
 517                 char *match_name, struct xtables_match *xt_m)
 518 {
 519         struct ipt_entry *new_entry;
 520         size_t match_size, target_size;
 521         int is_builtin = is_builtin_target(target_name);
 522
 523         if (xt_m)
 524                 match_size = xt_m->m->u.match_size;
 525         else
 526                 match_size = 0;
 527
 528         if (xt_t)
 529                 target_size = ALIGN(xt_t->t->u.target_size);
 530         else
 531                 target_size = ALIGN(sizeof(struct xt_standard_target));
 532
 533         new_entry = g_try_malloc0(sizeof(struct ipt_entry) + target_size +
 534                                                                 match_size);
 535         if (new_entry == NULL)
 536                 return NULL;
 537
 538         memcpy(&new_entry->ip, ip, sizeof(struct ipt_ip));
 539
 540         new_entry->target_offset = sizeof(struct ipt_entry) + match_size;
 541         new_entry->next_offset = sizeof(struct ipt_entry) + target_size +
 542                                                                 match_size;
 543         if (xt_m) {
 544                 struct xt_entry_match *entry_match;
 545
 546                 entry_match = (struct xt_entry_match *)new_entry->elems;
 547                 memcpy(entry_match, xt_m->m, match_size);
 548         }
 549
 550         if (xt_t) {
 551                 struct xt_entry_target *entry_target;
 552
 553                 if (is_builtin) {
 554                         struct xt_standard_target *target;
 555
 556                         target = (struct xt_standard_target *)(xt_t->t);
 557                         strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
 558                         target->verdict = target_to_verdict(target_name);
 559                 }
 560
 561                 entry_target = ipt_get_target(new_entry);
 562                 memcpy(entry_target, xt_t->t, target_size);
 563         } else {
 564                 struct connman_iptables_entry *target_rule;
 565                 struct xt_standard_target *target;
 566                 GList *chain_head;
 567
 568                 /*
 569                  * This is a user defined target, i.e. a chain jump.
 570                  * We search for the chain head, and the target verdict
 571                  * is the first rule's offset on this chain.
 572                  * The offset is from the beginning of the table.
 573                  */
 574
 575                 chain_head = find_chain_head(table, target_name);
 576                 if (chain_head == NULL || chain_head->next == NULL) {
 577                         g_free(new_entry);
 578                         return NULL;
 579                 }
 580
 581                 target_rule = chain_head->next->data;
 582
 583                 target = (struct xt_standard_target *)ipt_get_target(new_entry);
 584                 strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
 585                 target->target.u.user.target_size = target_size;
 586                 target->verdict = target_rule->offset;
 587         }
 588
 589         return new_entry;
 590 }
 591
 592 static void update_hooks(struct connman_iptables *table, GList *chain_head,
 593                                 struct ipt_entry *entry)
 594 {
 595         GList *list;
 596         struct connman_iptables_entry *head, *e;
 597         int builtin;
 598
 599         if (chain_head == NULL)
 600                 return;
 601
 602         head = chain_head->data;
 603
 604         builtin = head->builtin;
 605         if (builtin < 0)
 606                 return;
 607
 608         table->underflow[builtin] += entry->next_offset;
 609
 610         for (list = chain_head->next; list; list = list->next) {
 611                 e = list->data;
 612
 613                 builtin = e->builtin;
 614                 if (builtin < 0)
 615                         continue;
 616
 617                 table->hook_entry[builtin] += entry->next_offset;
 618                 table->underflow[builtin] += entry->next_offset;
 619         }
 620 }
 621
 622 static int
 623 connman_iptables_add_rule(struct connman_iptables *table,
 624                                 struct ipt_ip *ip, char *chain_name,
 625                                 char *target_name, struct xtables_target *xt_t,
 626                                 char *match_name, struct xtables_match *xt_m)
 627 {
 628         GList *chain_tail, *chain_head;
 629         struct ipt_entry *new_entry;
 630         struct connman_iptables_entry *head;
 631         int builtin = -1, ret;
 632
 633         chain_head = find_chain_head(table, chain_name);
 634         if (chain_head == NULL)
 635                 return -EINVAL;
 636
 637         chain_tail = find_chain_tail(table, chain_name);
 638         if (chain_tail == NULL)
 639                 return -EINVAL;
 640
 641         new_entry = new_rule(table, ip,
 642                                 target_name, xt_t,
 643                                 match_name, xt_m);
 644         if (new_entry == NULL)
 645                 return -EINVAL;
 646
 647         update_hooks(table, chain_head, new_entry);
 648
 649         /*
 650          * If the chain is builtin, and does not have any rule,
 651          * then the one that we're inserting is becoming the head
 652          * and thus needs the builtin flag.
 653          */
 654         head = chain_head->data;
 655         if (head->builtin < 0)
 656                 builtin = -1;
 657         else if (chain_head == chain_tail->prev) {
 658                 builtin = head->builtin;
 659                 head->builtin = -1;
 660         }
 661
 662         ret = connman_add_entry(table, new_entry, chain_tail->prev, builtin);
 663         if (ret < 0)
 664                 g_free(new_entry);
 665
 666         return ret;
 667 }
 668
 669 static struct ipt_replace *
 670 connman_iptables_blob(struct connman_iptables *table)
 671 {
 672         struct ipt_replace *r;
 673         GList *list;
 674         struct connman_iptables_entry *e;
 675         unsigned char *entry_index;
 676
 677         r = g_try_malloc0(sizeof(struct ipt_replace) + table->size);
 678         if (r == NULL)
 679                 return NULL;
 680
 681         memset(r, 0, sizeof(*r) + table->size);
 682
 683         r->counters = g_try_malloc0(sizeof(struct xt_counters)
 684                                 * table->old_entries);
 685         if (r->counters == NULL) {
 686                 g_free(r);
 687                 return NULL;
 688         }
 689
 690         strcpy(r->name, table->info->name);
 691         r->num_entries = table->num_entries;
 692         r->size = table->size;
 693
 694         r->num_counters = table->old_entries;
 695         r->valid_hooks  = table->info->valid_hooks;
 696
 697         memcpy(r->hook_entry, table->hook_entry, sizeof(table->hook_entry));
 698         memcpy(r->underflow, table->underflow, sizeof(table->underflow));
 699
 700         entry_index = (unsigned char *)r->entries;
 701         for (list = table->entries; list; list = list->next) {
 702                 e = list->data;
 703
 704                 memcpy(entry_index, e->entry, e->entry->next_offset);
 705                 entry_index += e->entry->next_offset;
 706         }
 707
 708         return r;
 709 }
 710
 711 static void dump_target(struct connman_iptables *table,
 712                                 struct ipt_entry *entry)
 713
 714 {
 715         struct xtables_target *xt_t;
 716         struct xt_entry_target *target;
 717
 718         target = ipt_get_target(entry);
 719
 720         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
 721                 struct xt_standard_target *t;
 722
 723                 t = (struct xt_standard_target *)target;
 724
 725                 switch (t->verdict) {
 726                 case XT_RETURN:
 727                         printf("\ttarget RETURN\n");
 728                         break;
 729
 730                 case -NF_ACCEPT - 1:
 731                         printf("\ttarget ACCEPT\n");
 732                         break;
 733
 734                 case -NF_DROP - 1:
 735                         printf("\ttarget DROP\n");
 736                         break;
 737
 738                 case -NF_QUEUE - 1:
 739                         printf("\ttarget QUEUE\n");
 740                         break;
 741
 742                 case -NF_STOP - 1:
 743                         printf("\ttarget STOP\n");
 744                         break;
 745
 746                 default:
 747                         printf("\tJUMP @%p (0x%x)\n",
 748                                 (char*)table->blob_entries->entrytable +
 749                                 t->verdict, t->verdict);
 750                         break;
 751                 }
 752
 753                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
 754                                                 XTF_LOAD_MUST_SUCCEED);
 755
 756                 if(xt_t->print != NULL)
 757                         xt_t->print(NULL, target, 1);
 758         } else {
 759                 xt_t = xtables_find_target(target->u.user.name, XTF_TRY_LOAD);
 760                 if (xt_t == NULL) {
 761                         printf("\ttarget %s\n", target->u.user.name);
 762                         return;
 763                 }
 764
 765                 if(xt_t->print != NULL) {
 766                         printf("\ttarget ");
 767                         xt_t->print(NULL, target, 1);
 768                         printf("\n");
 769                 }
 770         }
 771 }
 772
 773 static void dump_match(struct connman_iptables *table, struct ipt_entry *entry)
 774 {
 775         struct xtables_match *xt_m;
 776         struct xt_entry_match *match;
 777
 778         if (entry->elems == (unsigned char *)entry + entry->target_offset)
 779                 return;
 780
 781         match = (struct xt_entry_match *) entry->elems;
 782
 783         if (!strlen(match->u.user.name))
 784                 return;
 785
 786         xt_m = xtables_find_match(match->u.user.name, XTF_TRY_LOAD, NULL);
 787         if (xt_m == NULL)
 788                 goto out;
 789
 790         if(xt_m->print != NULL) {
 791                 printf("\tmatch ");
 792                 xt_m->print(NULL, match, 1);
 793                 printf("\n");
 794
 795                 return;
 796         }
 797
 798 out:
 799         printf("\tmatch %s\n", match->u.user.name);
 800
 801 }
 802
 803 static int connman_iptables_dump_entry(struct ipt_entry *entry,
 804                                         struct connman_iptables *table)
 805 {
 806         struct xt_entry_target *target;
 807         unsigned int offset;
 808         int builtin;
 809
 810         offset = (char *)entry - (char *)table->blob_entries->entrytable;
 811         target = ipt_get_target(entry);
 812         builtin = is_hook_entry(table, entry);
 813
 814         if (entry_to_offset(table, entry) + entry->next_offset ==
 815                                         table->blob_entries->size) {
 816                 printf("End of CHAIN 0x%x\n", offset);
 817                 return 0;
 818         }
 819
 820         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET)) {
 821                 printf("USER CHAIN (%s) %p  match %p  target %p  size %d\n",
 822                         target->data, entry, entry->elems,
 823                         (char *)entry + entry->target_offset,
 824                                 entry->next_offset);
 825
 826                 return 0;
 827         } else if (builtin >= 0) {
 828                 printf("CHAIN (%s) %p  match %p  target %p  size %d\n",
 829                         hooknames[builtin], entry, entry->elems,
 830                         (char *)entry + entry->target_offset,
 831                                 entry->next_offset);
 832         } else {
 833                 printf("RULE %p  match %p  target %p  size %d\n", entry,
 834                         entry->elems,
 835                         (char *)entry + entry->target_offset,
 836                                 entry->next_offset);
 837         }
 838
 839         dump_match(table, entry);
 840         dump_target(table, entry);
 841
 842         return 0;
 843 }
 844
 845 static void connman_iptables_dump_hook(struct connman_iptables *table)
 846 {
 847         int i;
 848         printf("hooks: \n");
 849         for (i = 0; i < NF_INET_NUMHOOKS; i++) {
 850                 if ((table->info->valid_hooks & (1 << i)))
 851                         printf("%s entry %p underflow %p (%#x)\n",
 852                                 hooknames[i],
 853                                 table->blob_entries->entrytable +
 854                                                 table->info->hook_entry[i],
 855                                 table->blob_entries->entrytable +
 856                                                 table->info->underflow[i],
 857                                         table->info->underflow[i]);
 858         }
 859 }
 860
 861 static void connman_iptables_dump(struct connman_iptables *table)
 862 {
 863         printf("%s valid_hooks=0x%08x, num_entries=%u, size=%u\n",
 864                 table->info->name,
 865                 table->info->valid_hooks, table->info->num_entries,
 866                 table->info->size);
 867
 868         connman_iptables_dump_hook(table);
 869
 870         ENTRY_ITERATE(table->blob_entries->entrytable,
 871                         table->blob_entries->size,
 872                         connman_iptables_dump_entry, table);
 873
 874 }
 875
 876 static int connman_iptables_get_entries(struct connman_iptables *table)
 877 {
 878         socklen_t entry_size;
 879
 880         entry_size = sizeof(struct ipt_get_entries) + table->info->size;
 881
 882         return getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_ENTRIES,
 883                                 table->blob_entries, &entry_size);
 884 }
 885
 886 static int connman_iptables_replace(struct connman_iptables *table,
 887                                         struct ipt_replace *r)
 888 {
 889         return setsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_SET_REPLACE, r,
 890                          sizeof(*r) + r->size);
 891 }
 892
 893 static void connman_iptables_cleanup(struct connman_iptables *table)
 894 {
 895         GList *list;
 896         struct connman_iptables_entry *entry;
 897
 898         close(table->ipt_sock);
 899
 900         for (list = table->entries; list; list = list->next) {
 901                 entry = list->data;
 902
 903                 g_free(entry->entry);
 904         }
 905
 906         g_free(table->info);
 907         g_free(table->blob_entries);
 908         g_free(table);
 909
 910         xtables_free_opts(1);
 911 }
 912
 913 static int connman_iptables_commit(struct connman_iptables *table)
 914 {
 915         struct ipt_replace *repl;
 916
 917         repl = connman_iptables_blob(table);
 918
 919         return connman_iptables_replace(table, repl);
 920 }
 921
 922 static int add_entry(struct ipt_entry *entry, struct connman_iptables *table)
 923 {
 924         struct ipt_entry *new_entry;
 925         int builtin;
 926
 927         new_entry = g_try_malloc0(entry->next_offset);
 928         if (new_entry == NULL)
 929                 return -ENOMEM;
 930
 931         memcpy(new_entry, entry, entry->next_offset);
 932
 933         builtin = is_hook_entry(table, entry);
 934
 935         return connman_add_entry(table, new_entry, NULL, builtin);
 936 }
 937
 938 static struct connman_iptables *connman_iptables_init(const char *table_name)
 939 {
 940         struct connman_iptables *table;
 941         socklen_t s;
 942
 943         table =  g_try_new0(struct connman_iptables, 1);
 944         if (table == NULL)
 945                 return NULL;
 946
 947         table->info =  g_try_new0(struct ipt_getinfo, 1);
 948         if (table->info == NULL)
 949                 goto err;
 950
 951         table->ipt_sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
 952         if (table->ipt_sock < 0)
 953                 goto err;
 954
 955         s = sizeof(*table->info);
 956         strcpy(table->info->name, table_name);
 957         if (getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_INFO,
 958                                                 table->info, &s) < 0)
 959                 goto err;
 960
 961         table->blob_entries = g_try_malloc0(sizeof(struct ipt_get_entries) +
 962                                                 table->info->size);
 963         if (table->blob_entries == NULL)
 964                 goto err;
 965
 966         strcpy(table->blob_entries->name, table_name);
 967         table->blob_entries->size = table->info->size;
 968
 969         if (connman_iptables_get_entries(table) < 0)
 970                 goto err;
 971
 972         table->num_entries = 0;
 973         table->old_entries = table->info->num_entries;
 974         table->size = 0;
 975
 976         memcpy(table->underflow, table->info->underflow,
 977                                 sizeof(table->info->underflow));
 978         memcpy(table->hook_entry, table->info->hook_entry,
 979                                 sizeof(table->info->hook_entry));
 980
 981         ENTRY_ITERATE(table->blob_entries->entrytable,
 982                         table->blob_entries->size,
 983                                 add_entry, table);
 984
 985
 986         return table;
 987
 988 err:
 989
 990         connman_iptables_cleanup(table);
 991
 992         return NULL;
 993 }
 994
 995
 996 static struct option connman_iptables_opts[] = {
 997         {.name = "append",        .has_arg = 1, .val = 'A'},
 998         {.name = "flush-chain",   .has_arg = 1, .val = 'F'},
 999         {.name = "list",          .has_arg = 2, .val = 'L'},
1000         {.name = "new-chain",     .has_arg = 1, .val = 'N'},
1001         {.name = "delete-chain",  .has_arg = 1, .val = 'X'},
1002         {.name = "destination",   .has_arg = 1, .val = 'd'},
1003         {.name = "in-interface",  .has_arg = 1, .val = 'i'},
1004         {.name = "jump",          .has_arg = 1, .val = 'j'},
1005         {.name = "match",         .has_arg = 1, .val = 'm'},
1006         {.name = "out-interface", .has_arg = 1, .val = 'o'},
1007         {.name = "source",        .has_arg = 1, .val = 's'},
1008         {.name = "table",         .has_arg = 1, .val = 't'},
1009         {NULL},
1010 };
1011
1012 struct xtables_globals connman_iptables_globals = {
1013         .option_offset = 0,
1014         .opts = connman_iptables_opts,
1015         .orig_opts = connman_iptables_opts,
1016 };
1017
1018 int main(int argc, char *argv[])
1019 {
1020         struct connman_iptables *table;
1021         struct xtables_match *xt_m;
1022         struct xtables_target *xt_t;
1023         struct ipt_ip ip;
1024         char *table_name, *chain, *new_chain, *match_name, *target_name;
1025         char *delete_chain, *flush_chain;
1026         int c, in_len, out_len;
1027         size_t size;
1028         gboolean dump, invert, delete;
1029         struct in_addr src, dst;
1030
1031         xtables_init_all(&connman_iptables_globals, NFPROTO_IPV4);
1032
1033         dump = FALSE;
1034         invert = FALSE;
1035         delete = FALSE;
1036         table_name = chain = new_chain = match_name = target_name = NULL;
1037         delete_chain = flush_chain = NULL;
1038         memset(&ip, 0, sizeof(struct ipt_ip));
1039         table = NULL;
1040         xt_m = NULL;
1041         xt_t = NULL;
1042
1043         while ((c = getopt_long(argc, argv, "-A:F:L::N:X:d:i:j:m:o:s:t:",
1044                                 connman_iptables_globals.opts, NULL)) != -1) {
1045                 switch (c) {
1046                 case 'A':
1047                         chain = optarg;
1048                         break;
1049
1050                 case 'F':
1051                         flush_chain = optarg;
1052                         break;
1053
1054                 case 'L':
1055                         dump = true;
1056                         break;
1057
1058                 case 'N':
1059                         new_chain = optarg;
1060                         break;
1061
1062                 case 'X':
1063                         delete = true;
1064                         delete_chain = optarg;
1065                         break;
1066
1067                 case 'd':
1068                         if (!inet_pton(AF_INET, optarg, &dst))
1069                                 break;
1070
1071                         ip.dst = dst;
1072                         inet_pton(AF_INET, "255.255.255.255", &ip.dmsk);
1073
1074                         if (invert)
1075                                 ip.invflags |= IPT_INV_DSTIP;
1076
1077                         break;
1078
1079                 case 'i':
1080                         in_len = strlen(optarg);
1081
1082                         if (in_len + 1 > IFNAMSIZ)
1083                                 break;
1084
1085                         strcpy(ip.iniface, optarg);
1086                         memset(ip.iniface_mask, 0xff, in_len + 1);
1087
1088                         if (invert)
1089                                 ip.invflags |= IPT_INV_VIA_IN;
1090
1091                         break;
1092
1093                 case 'j':
1094                         target_name = optarg;
1095                         xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
1096
1097                         if (xt_t == NULL)
1098                                 break;
1099
1100                         size = ALIGN(sizeof(struct ipt_entry_target)) + xt_t->size;
1101
1102                         xt_t->t = g_try_malloc0(size);
1103                         if (xt_t->t == NULL)
1104                                 goto out;
1105                         xt_t->t->u.target_size = size;
1106                         strcpy(xt_t->t->u.user.name, target_name);
1107                         xt_t->t->u.user.revision = xt_t->revision;
1108                         if (xt_t->init != NULL)
1109                                 xt_t->init(xt_t->t);
1110                         connman_iptables_globals.opts =
1111                                 xtables_merge_options(
1112 #if XTABLES_VERSION_CODE > 5
1113                                                      connman_iptables_globals.orig_opts,
1114 #endif
1115                                                      connman_iptables_globals.opts,
1116                                                      xt_t->extra_opts,
1117                                                      &xt_t->option_offset);
1118                         if (connman_iptables_globals.opts == NULL)
1119                                 goto out;
1120
1121                         break;
1122
1123                 case 'm':
1124                         match_name = optarg;
1125
1126                         xt_m = xtables_find_match(optarg, XTF_LOAD_MUST_SUCCEED, NULL);
1127                         size = ALIGN(sizeof(struct ipt_entry_match)) + xt_m->size;
1128                         xt_m->m = g_try_malloc0(size);
1129                         if (xt_m == NULL)
1130                                 goto out;
1131                         xt_m->m->u.match_size = size;
1132                         strcpy(xt_m->m->u.user.name, xt_m->name);
1133                         xt_m->m->u.user.revision = xt_m->revision;
1134                         if (xt_m->init != NULL)
1135                                 xt_m->init(xt_m->m);
1136                         if (xt_m != xt_m->next) {
1137                                 connman_iptables_globals.opts =
1138                                         xtables_merge_options(
1139 #if XTABLES_VERSION_CODE > 5
1140                                                 connman_iptables_globals.orig_opts,
1141 #endif
1142                                                 connman_iptables_globals.opts,
1143                                                 xt_m->extra_opts,
1144                                                 &xt_m->option_offset);
1145                                 if (connman_iptables_globals.opts == NULL)
1146                                         goto out;
1147                         }
1148
1149                         break;
1150
1151                 case 'o':
1152                         out_len = strlen(optarg);
1153
1154                         if (out_len + 1 > IFNAMSIZ)
1155                                 break;
1156
1157                         strcpy(ip.outiface, optarg);
1158                         memset(ip.outiface_mask, 0xff, out_len + 1);
1159
1160                         if (invert)
1161                                 ip.invflags |= IPT_INV_VIA_OUT;
1162
1163                         break;
1164
1165                 case 's':
1166                         if (!inet_pton(AF_INET, optarg, &src))
1167                                 break;
1168
1169                         ip.src = src;
1170                         inet_pton(AF_INET, "255.255.255.255", &ip.smsk);
1171
1172                         if (invert)
1173                                 ip.invflags |= IPT_INV_SRCIP;
1174
1175                         break;
1176
1177                 case 't':
1178                         table_name = optarg;
1179                         break;
1180
1181                 case 1:
1182                         if (optarg[0] == '!' && optarg[1] == '\0') {
1183                                 if (invert)
1184                                         printf("Consecutive ! not allowed\n");
1185
1186                                 invert = TRUE;
1187                                 optarg[0] = '\0';
1188                                 continue;
1189                         }
1190
1191                         printf("Invalid option\n");
1192
1193                         return -1;
1194
1195                 default:
1196                         if (xt_t == NULL || xt_t->parse == NULL ||
1197                             !xt_t->parse(c - xt_t->option_offset, argv, invert,
1198                                         &xt_t->tflags, NULL, &xt_t->t)) {
1199                                 if (xt_m == NULL || xt_m->parse == NULL)
1200                                         break;
1201
1202                                 xt_m->parse(c - xt_m->option_offset, argv,
1203                                         invert, &xt_m->mflags, NULL, &xt_m->m);
1204                         }
1205
1206                         break;
1207                 }
1208         }
1209
1210         if (table_name == NULL)
1211                 table_name = "filter";
1212
1213         table = connman_iptables_init(table_name);
1214         if (table == NULL)
1215                 return -1;
1216
1217         if (delete) {
1218                 if (delete_chain == NULL)
1219                         goto out;
1220
1221                 printf("Delete chain %s\n", delete_chain);
1222
1223                 connman_iptables_delete_chain(table, delete_chain);
1224
1225                 goto commit;
1226         }
1227
1228         if (flush_chain) {
1229                 printf("Flush chain %s\n", flush_chain);
1230
1231                 connman_iptables_flush_chain(table, flush_chain);
1232
1233                 goto commit;
1234         }
1235
1236         if (dump) {
1237                 connman_iptables_dump(table);
1238
1239                 return 0;
1240         }
1241
1242         if (chain && new_chain)
1243                 return -1;
1244
1245         if (new_chain) {
1246                 printf("New chain %s\n", new_chain);
1247
1248                 connman_iptables_add_chain(table, new_chain);
1249
1250                 goto commit;
1251         }
1252
1253         if (chain) {
1254                 if (target_name == NULL)
1255                         return -1;
1256
1257                 printf("Adding %s to %s (match %s)\n",
1258                                 target_name, chain, match_name);
1259
1260                 connman_iptables_add_rule(table, &ip, chain,
1261                                 target_name, xt_t, match_name, xt_m);
1262
1263                 goto commit;
1264         }
1265
1266 commit:
1267
1268         connman_iptables_commit(table);
1269
1270 out:
1271         connman_iptables_cleanup(table);
1272
1273         if (xt_t)
1274                 g_free(xt_t->t);
1275
1276         if (xt_m)
1277                 g_free(xt_m->m);
1278
1279         return 0;
1280 }