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         int builtin;
  93
  94         struct ipt_entry *entry;
  95 };
  96
  97 struct connman_iptables {
  98         int ipt_sock;
  99
 100         struct ipt_getinfo *info;
 101         struct ipt_get_entries *blob_entries;
 102
 103         unsigned int num_entries;
 104         unsigned int old_entries;
 105         unsigned int size;
 106
 107         unsigned int underflow[NF_INET_NUMHOOKS];
 108         unsigned int hook_entry[NF_INET_NUMHOOKS];
 109
 110         GList *entries;
 111 };
 112
 113 static GHashTable *table_hash = NULL;
 114
 115 static struct ipt_entry *get_entry(struct connman_iptables *table,
 116                                         unsigned int offset)
 117 {
 118         return (struct ipt_entry *)((char *)table->blob_entries->entrytable +
 119                                                                         offset);
 120 }
 121
 122 static int is_hook_entry(struct connman_iptables *table,
 123                                 struct ipt_entry *entry)
 124 {
 125         unsigned int i;
 126
 127         for (i = 0; i < NF_INET_NUMHOOKS; i++) {
 128                 if ((table->info->valid_hooks & (1 << i))
 129                 && get_entry(table, table->info->hook_entry[i]) == entry)
 130                         return i;
 131         }
 132
 133         return -1;
 134 }
 135
 136 static unsigned long entry_to_offset(struct connman_iptables *table,
 137                                         struct ipt_entry *entry)
 138 {
 139         return (void *)entry - (void *)table->blob_entries->entrytable;
 140 }
 141
 142 static int target_to_verdict(char *target_name)
 143 {
 144         if (!strcmp(target_name, LABEL_ACCEPT))
 145                 return -NF_ACCEPT - 1;
 146
 147         if (!strcmp(target_name, LABEL_DROP))
 148                 return -NF_DROP - 1;
 149
 150         if (!strcmp(target_name, LABEL_QUEUE))
 151                 return -NF_QUEUE - 1;
 152
 153         if (!strcmp(target_name, LABEL_RETURN))
 154                 return XT_RETURN;
 155
 156         return 0;
 157 }
 158
 159 static gboolean is_builtin_target(char *target_name)
 160 {
 161         if (!strcmp(target_name, LABEL_ACCEPT) ||
 162                 !strcmp(target_name, LABEL_DROP) ||
 163                 !strcmp(target_name, LABEL_QUEUE) ||
 164                 !strcmp(target_name, LABEL_RETURN))
 165                 return TRUE;
 166
 167         return FALSE;
 168 }
 169
 170 static gboolean is_jump(struct connman_iptables_entry *e)
 171 {
 172         struct xt_entry_target *target;
 173
 174         target = ipt_get_target(e->entry);
 175
 176         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
 177                 struct xt_standard_target *t;
 178
 179                 t = (struct xt_standard_target *)target;
 180
 181                 switch (t->verdict) {
 182                 case XT_RETURN:
 183                 case -NF_ACCEPT - 1:
 184                 case -NF_DROP - 1:
 185                 case -NF_QUEUE - 1:
 186                 case -NF_STOP - 1:
 187                         return false;
 188
 189                 default:
 190                         return true;
 191                 }
 192         }
 193
 194         return false;
 195 }
 196
 197 static gboolean is_chain(struct connman_iptables *table,
 198                                 struct connman_iptables_entry *e)
 199 {
 200         struct ipt_entry *entry;
 201         struct xt_entry_target *target;
 202
 203         entry = e->entry;
 204         if (e->builtin >= 0)
 205                 return TRUE;
 206
 207         target = ipt_get_target(entry);
 208         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET))
 209                 return TRUE;
 210
 211         return FALSE;
 212 }
 213
 214 static GList *find_chain_head(struct connman_iptables *table,
 215                                 char *chain_name)
 216 {
 217         GList *list;
 218         struct connman_iptables_entry *head;
 219         struct ipt_entry *entry;
 220         struct xt_entry_target *target;
 221         int builtin;
 222
 223         for (list = table->entries; list; list = list->next) {
 224                 head = list->data;
 225                 entry = head->entry;
 226
 227                 /* Buit-in chain */
 228                 builtin = head->builtin;
 229                 if (builtin >= 0 && !strcmp(hooknames[builtin], chain_name))
 230                         break;
 231
 232                 /* User defined chain */
 233                 target = ipt_get_target(entry);
 234                 if (!strcmp(target->u.user.name, IPT_ERROR_TARGET) &&
 235                     !strcmp((char *)target->data, chain_name))
 236                         break;
 237         }
 238
 239         return list;
 240 }
 241
 242 static GList *find_chain_tail(struct connman_iptables *table,
 243                                 char *chain_name)
 244 {
 245         GList *chain_head, *list;
 246         struct connman_iptables_entry *head, *tail;
 247         struct ipt_entry *entry;
 248         struct xt_entry_target *target;
 249         int builtin;
 250
 251         /* First we look for the head */
 252         for (list = table->entries; list; list = list->next) {
 253                 head = list->data;
 254                 entry = head->entry;
 255
 256                 /* Buit-in chain */
 257                 builtin = head->builtin;
 258                 if (builtin >= 0 && !strcmp(hooknames[builtin], chain_name))
 259                         break;
 260
 261                 /* User defined chain */
 262                 target = ipt_get_target(entry);
 263                 if (!strcmp(target->u.user.name, IPT_ERROR_TARGET) &&
 264                     !strcmp((char *)target->data, chain_name))
 265                         break;
 266         }
 267
 268         if (list == NULL)
 269                 return NULL;
 270
 271         chain_head = list;
 272
 273         /* Then we look for the next chain */
 274         for (list = chain_head->next; list; list = list->next) {
 275                 tail = list->data;
 276                 entry = tail->entry;
 277
 278                 if (is_chain(table, tail))
 279                         return list;
 280         }
 281
 282         /* Nothing found, we return the table end */
 283         return g_list_last(table->entries);
 284 }
 285
 286
 287 static void update_offsets(struct connman_iptables *table)
 288 {
 289         GList *list, *prev;
 290         struct connman_iptables_entry *entry, *prev_entry;
 291
 292         for (list = table->entries; list; list = list->next) {
 293                 entry = list->data;
 294
 295                 if (list == table->entries) {
 296                         entry->offset = 0;
 297
 298                         continue;
 299                 }
 300
 301                 prev = list->prev;
 302                 prev_entry = prev->data;
 303
 304                 entry->offset = prev_entry->offset +
 305                                         prev_entry->entry->next_offset;
 306         }
 307 }
 308
 309 static int iptables_add_entry(struct connman_iptables *table,
 310                                 struct ipt_entry *entry, GList *before,
 311                                         int builtin)
 312 {
 313         GList *list;
 314         struct connman_iptables_entry *e, *tmp, *entry_before;
 315         struct xt_standard_target *t;
 316
 317         if (table == NULL)
 318                 return -1;
 319
 320         e = g_try_malloc0(sizeof(struct connman_iptables_entry));
 321         if (e == NULL)
 322                 return -1;
 323
 324         e->entry = entry;
 325         e->builtin = builtin;
 326
 327         table->entries = g_list_insert_before(table->entries, before, e);
 328         table->num_entries++;
 329         table->size += entry->next_offset;
 330
 331         if (before == NULL) {
 332                 e->offset = table->size - entry->next_offset;
 333
 334                 return 0;
 335         }
 336
 337         entry_before = before->data;
 338
 339         /*
 340          * We've just insterted a new entry. All references before it
 341          * should be bumped accordingly.
 342          */
 343         for (list = table->entries; list != before; list = list->next) {
 344                 tmp = list->data;
 345
 346                 if (!is_jump(tmp))
 347                         continue;
 348
 349                 t = (struct xt_standard_target *)ipt_get_target(tmp->entry);
 350
 351                 if (t->verdict >= entry_before->offset)
 352                         t->verdict += entry->next_offset;
 353         }
 354
 355         update_offsets(table);
 356
 357         return 0;
 358 }
 359
 360 static int iptables_flush_chain(struct connman_iptables *table,
 361                                                 char *name)
 362 {
 363         GList *chain_head, *chain_tail, *list, *next;
 364         struct connman_iptables_entry *entry;
 365         int builtin, removed = 0;
 366
 367         chain_head = find_chain_head(table, name);
 368         if (chain_head == NULL)
 369                 return -EINVAL;
 370
 371         chain_tail = find_chain_tail(table, name);
 372         if (chain_tail == NULL)
 373                 return -EINVAL;
 374
 375         entry = chain_head->data;
 376         builtin = entry->builtin;
 377
 378         if (builtin >= 0)
 379                 list = chain_head;
 380         else
 381                 list = chain_head->next;
 382
 383         if (list == chain_tail->prev)
 384                 return 0;
 385
 386         while (list != chain_tail->prev) {
 387                 entry = list->data;
 388                 next = g_list_next(list);
 389
 390                 table->num_entries--;
 391                 table->size -= entry->entry->next_offset;
 392                 removed += entry->entry->next_offset;
 393
 394                 g_free(entry->entry);
 395
 396                 table->entries = g_list_remove(table->entries, list->data);
 397
 398                 list = next;
 399         }
 400
 401         if (builtin >= 0) {
 402                 struct connman_iptables_entry *e;
 403
 404                 entry = list->data;
 405
 406                 entry->builtin = builtin;
 407
 408                 table->underflow[builtin] -= removed;
 409
 410                 for (list = chain_tail; list; list = list->next) {
 411                         e = list->data;
 412
 413                         builtin = e->builtin;
 414                         if (builtin < 0)
 415                                 continue;
 416
 417                         table->hook_entry[builtin] -= removed;
 418                         table->underflow[builtin] -= removed;
 419                 }
 420         }
 421
 422         update_offsets(table);
 423
 424         return 0;
 425 }
 426
 427 static int iptables_add_chain(struct connman_iptables *table,
 428                                         char *name)
 429 {
 430         GList *last;
 431         struct ipt_entry *entry_head;
 432         struct ipt_entry *entry_return;
 433         struct ipt_error_target *error;
 434         struct ipt_standard_target *standard;
 435         u_int16_t entry_head_size, entry_return_size;
 436
 437         last = g_list_last(table->entries);
 438
 439         /*
 440          * An empty chain is composed of:
 441          * - A head entry, with no match and an error target.
 442          *   The error target data is the chain name.
 443          * - A tail entry, with no match and a standard target.
 444          *   The standard target verdict is XT_RETURN (return to the
 445          *   caller).
 446          */
 447
 448         /* head entry */
 449         entry_head_size = sizeof(struct ipt_entry) +
 450                                 sizeof(struct ipt_error_target);
 451         entry_head = g_try_malloc0(entry_head_size);
 452         if (entry_head == NULL)
 453                 goto err;
 454
 455         memset(entry_head, 0, entry_head_size);
 456
 457         entry_head->target_offset = sizeof(struct ipt_entry);
 458         entry_head->next_offset = entry_head_size;
 459
 460         error = (struct ipt_error_target *) entry_head->elems;
 461         strcpy(error->t.u.user.name, IPT_ERROR_TARGET);
 462         error->t.u.user.target_size = ALIGN(sizeof(struct ipt_error_target));
 463         strcpy(error->error, name);
 464
 465         if (iptables_add_entry(table, entry_head, last, -1) < 0)
 466                 goto err;
 467
 468         /* tail entry */
 469         entry_return_size = sizeof(struct ipt_entry) +
 470                                 sizeof(struct ipt_standard_target);
 471         entry_return = g_try_malloc0(entry_return_size);
 472         if (entry_return == NULL)
 473                 goto err;
 474
 475         memset(entry_return, 0, entry_return_size);
 476
 477         entry_return->target_offset = sizeof(struct ipt_entry);
 478         entry_return->next_offset = entry_return_size;
 479
 480         standard = (struct ipt_standard_target *) entry_return->elems;
 481         standard->target.u.user.target_size =
 482                                 ALIGN(sizeof(struct ipt_standard_target));
 483         standard->verdict = XT_RETURN;
 484
 485         if (iptables_add_entry(table, entry_return, last, -1) < 0)
 486                 goto err;
 487
 488         return 0;
 489
 490 err:
 491         g_free(entry_head);
 492         g_free(entry_return);
 493
 494         return -ENOMEM;
 495 }
 496
 497 static struct ipt_entry *
 498 new_rule(struct connman_iptables *table, struct ipt_ip *ip,
 499                 char *target_name, struct xtables_target *xt_t,
 500                 char *match_name, struct xtables_match *xt_m)
 501 {
 502         struct ipt_entry *new_entry;
 503         size_t match_size, target_size;
 504         int is_builtin = is_builtin_target(target_name);
 505
 506         if (xt_m)
 507                 match_size = xt_m->m->u.match_size;
 508         else
 509                 match_size = 0;
 510
 511         if (xt_t)
 512                 target_size = ALIGN(xt_t->t->u.target_size);
 513         else
 514                 target_size = ALIGN(sizeof(struct xt_standard_target));
 515
 516         new_entry = g_try_malloc0(sizeof(struct ipt_entry) + target_size +
 517                                                                 match_size);
 518         if (new_entry == NULL)
 519                 return NULL;
 520
 521         memcpy(&new_entry->ip, ip, sizeof(struct ipt_ip));
 522
 523         new_entry->target_offset = sizeof(struct ipt_entry) + match_size;
 524         new_entry->next_offset = sizeof(struct ipt_entry) + target_size +
 525                                                                 match_size;
 526         if (xt_m) {
 527                 struct xt_entry_match *entry_match;
 528
 529                 entry_match = (struct xt_entry_match *)new_entry->elems;
 530                 memcpy(entry_match, xt_m->m, match_size);
 531         }
 532
 533         if (xt_t) {
 534                 struct xt_entry_target *entry_target;
 535
 536                 if (is_builtin) {
 537                         struct xt_standard_target *target;
 538
 539                         target = (struct xt_standard_target *)(xt_t->t);
 540                         strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
 541                         target->verdict = target_to_verdict(target_name);
 542                 }
 543
 544                 entry_target = ipt_get_target(new_entry);
 545                 memcpy(entry_target, xt_t->t, target_size);
 546         } else {
 547                 struct connman_iptables_entry *target_rule;
 548                 struct xt_standard_target *target;
 549                 GList *chain_head;
 550
 551                 /*
 552                  * This is a user defined target, i.e. a chain jump.
 553                  * We search for the chain head, and the target verdict
 554                  * is the first rule's offset on this chain.
 555                  * The offset is from the beginning of the table.
 556                  */
 557
 558                 chain_head = find_chain_head(table, target_name);
 559                 if (chain_head == NULL || chain_head->next == NULL) {
 560                         g_free(new_entry);
 561                         return NULL;
 562                 }
 563
 564                 target_rule = chain_head->next->data;
 565
 566                 target = (struct xt_standard_target *)ipt_get_target(new_entry);
 567                 strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
 568                 target->target.u.user.target_size = target_size;
 569                 target->verdict = target_rule->offset;
 570         }
 571
 572         return new_entry;
 573 }
 574
 575 static void update_hooks(struct connman_iptables *table, GList *chain_head,
 576                                 struct ipt_entry *entry)
 577 {
 578         GList *list;
 579         struct connman_iptables_entry *head, *e;
 580         int builtin;
 581
 582         if (chain_head == NULL)
 583                 return;
 584
 585         head = chain_head->data;
 586
 587         builtin = head->builtin;
 588         if (builtin < 0)
 589                 return;
 590
 591         table->underflow[builtin] += entry->next_offset;
 592
 593         for (list = chain_head->next; list; list = list->next) {
 594                 e = list->data;
 595
 596                 builtin = e->builtin;
 597                 if (builtin < 0)
 598                         continue;
 599
 600                 table->hook_entry[builtin] += entry->next_offset;
 601                 table->underflow[builtin] += entry->next_offset;
 602         }
 603 }
 604
 605 static int
 606 iptables_add_rule(struct connman_iptables *table,
 607                                 struct ipt_ip *ip, char *chain_name,
 608                                 char *target_name, struct xtables_target *xt_t,
 609                                 char *match_name, struct xtables_match *xt_m)
 610 {
 611         GList *chain_tail, *chain_head;
 612         struct ipt_entry *new_entry;
 613         struct connman_iptables_entry *head;
 614         int builtin = -1;
 615
 616         DBG("");
 617
 618         chain_head = find_chain_head(table, chain_name);
 619         if (chain_head == NULL)
 620                 return -EINVAL;
 621
 622         chain_tail = find_chain_tail(table, chain_name);
 623         if (chain_tail == NULL)
 624                 return -EINVAL;
 625
 626         new_entry = new_rule(table, ip,
 627                                 target_name, xt_t,
 628                                 match_name, xt_m);
 629         if (new_entry == NULL)
 630                 return -EINVAL;
 631
 632         update_hooks(table, chain_head, new_entry);
 633
 634         /*
 635          * If the chain is builtin, and does not have any rule,
 636          * then the one that we're inserting is becoming the head
 637          * and thus needs the builtin flag.
 638          */
 639         head = chain_head->data;
 640         if (head->builtin < 0)
 641                 builtin = -1;
 642         else if (chain_head == chain_tail->prev) {
 643                 builtin = head->builtin;
 644                 head->builtin = -1;
 645         }
 646
 647         return iptables_add_entry(table, new_entry, chain_tail->prev, builtin);
 648 }
 649
 650 static struct ipt_replace *
 651 iptables_blob(struct connman_iptables *table)
 652 {
 653         struct ipt_replace *r;
 654         GList *list;
 655         struct connman_iptables_entry *e;
 656         unsigned char *entry_index;
 657
 658         r = g_try_malloc0(sizeof(struct ipt_replace) + table->size);
 659         if (r == NULL)
 660                 return NULL;
 661
 662         memset(r, 0, sizeof(*r) + table->size);
 663
 664         r->counters = g_try_malloc0(sizeof(struct xt_counters)
 665                                 * table->old_entries);
 666         if (r->counters == NULL) {
 667                 g_free(r);
 668                 return NULL;
 669         }
 670
 671         strcpy(r->name, table->info->name);
 672         r->num_entries = table->num_entries;
 673         r->size = table->size;
 674
 675         r->num_counters = table->old_entries;
 676         r->valid_hooks  = table->info->valid_hooks;
 677
 678         memcpy(r->hook_entry, table->hook_entry, sizeof(table->hook_entry));
 679         memcpy(r->underflow, table->underflow, sizeof(table->underflow));
 680
 681         entry_index = (unsigned char *)r->entries;
 682         for (list = table->entries; list; list = list->next) {
 683                 e = list->data;
 684
 685                 memcpy(entry_index, e->entry, e->entry->next_offset);
 686                 entry_index += e->entry->next_offset;
 687         }
 688
 689         return r;
 690 }
 691
 692 static void dump_ip(struct ipt_entry *entry)
 693 {
 694         struct ipt_ip *ip = &entry->ip;
 695         char ip_string[INET6_ADDRSTRLEN];
 696         char ip_mask[INET6_ADDRSTRLEN];
 697
 698         if (strlen(ip->iniface))
 699                 connman_info("\tin %s", ip->iniface);
 700
 701         if (strlen(ip->outiface))
 702                 connman_info("\tout %s", ip->outiface);
 703
 704         if (inet_ntop(AF_INET, &ip->src, ip_string, INET6_ADDRSTRLEN) != NULL &&
 705                         inet_ntop(AF_INET, &ip->smsk,
 706                                         ip_mask, INET6_ADDRSTRLEN) != NULL)
 707                 connman_info("\tsrc %s/%s", ip_string, ip_mask);
 708
 709         if (inet_ntop(AF_INET, &ip->dst, ip_string, INET6_ADDRSTRLEN) != NULL &&
 710                         inet_ntop(AF_INET, &ip->dmsk,
 711                                         ip_mask, INET6_ADDRSTRLEN) != NULL)
 712                 connman_info("\tdst %s/%s", ip_string, ip_mask);
 713 }
 714
 715 static void dump_target(struct connman_iptables *table,
 716                                 struct ipt_entry *entry)
 717
 718 {
 719         struct xtables_target *xt_t;
 720         struct xt_entry_target *target;
 721
 722         target = ipt_get_target(entry);
 723
 724         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
 725                 struct xt_standard_target *t;
 726
 727                 t = (struct xt_standard_target *)target;
 728
 729                 switch (t->verdict) {
 730                 case XT_RETURN:
 731                         connman_info("\ttarget RETURN");
 732                         break;
 733
 734                 case -NF_ACCEPT - 1:
 735                         connman_info("\ttarget ACCEPT");
 736                         break;
 737
 738                 case -NF_DROP - 1:
 739                         connman_info("\ttarget DROP");
 740                         break;
 741
 742                 case -NF_QUEUE - 1:
 743                         connman_info("\ttarget QUEUE");
 744                         break;
 745
 746                 case -NF_STOP - 1:
 747                         connman_info("\ttarget STOP");
 748                         break;
 749
 750                 default:
 751                         connman_info("\tJUMP @%p (0x%x)",
 752                                 (char*)table->blob_entries->entrytable +
 753                                 t->verdict, t->verdict);
 754                         break;
 755                 }
 756
 757                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
 758                                                 XTF_LOAD_MUST_SUCCEED);
 759
 760                 if(xt_t->print != NULL)
 761                         xt_t->print(NULL, target, 1);
 762         } else {
 763                 xt_t = xtables_find_target(target->u.user.name, XTF_TRY_LOAD);
 764                 if (xt_t == NULL) {
 765                         connman_info("\ttarget %s", target->u.user.name);
 766                         return;
 767                 }
 768
 769                 if(xt_t->print != NULL) {
 770                         connman_info("\ttarget ");
 771                         xt_t->print(NULL, target, 1);
 772                 }
 773         }
 774 }
 775
 776 static void dump_match(struct connman_iptables *table, struct ipt_entry *entry)
 777 {
 778         struct xtables_match *xt_m;
 779         struct xt_entry_match *match;
 780
 781         if (entry->elems == (unsigned char *)entry + entry->target_offset)
 782                 return;
 783
 784         match = (struct xt_entry_match *) entry->elems;
 785
 786         if (!strlen(match->u.user.name))
 787                 return;
 788
 789         xt_m = xtables_find_match(match->u.user.name, XTF_TRY_LOAD, NULL);
 790         if (xt_m == NULL)
 791                 goto out;
 792
 793         if(xt_m->print != NULL) {
 794                 connman_info("\tmatch ");
 795                 xt_m->print(NULL, match, 1);
 796
 797                 return;
 798         }
 799
 800 out:
 801         connman_info("\tmatch %s", match->u.user.name);
 802
 803 }
 804
 805 static int dump_entry(struct ipt_entry *entry,
 806                                 struct connman_iptables *table)
 807 {
 808         struct xt_entry_target *target;
 809         unsigned int offset;
 810         int builtin;
 811
 812         offset = (char *)entry - (char *)table->blob_entries->entrytable;
 813         target = ipt_get_target(entry);
 814         builtin = is_hook_entry(table, entry);
 815
 816         if (entry_to_offset(table, entry) + entry->next_offset ==
 817                                         table->blob_entries->size) {
 818                 connman_info("End of CHAIN 0x%x", offset);
 819                 return 0;
 820         }
 821
 822         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET)) {
 823                 connman_info("USER CHAIN (%s) %p  match %p  target %p  size %d",
 824                         target->data, entry, entry->elems,
 825                         (char *)entry + entry->target_offset,
 826                                 entry->next_offset);
 827
 828                 return 0;
 829         } else if (builtin >= 0) {
 830                 connman_info("CHAIN (%s) %p  match %p  target %p  size %d",
 831                         hooknames[builtin], entry, entry->elems,
 832                         (char *)entry + entry->target_offset,
 833                                 entry->next_offset);
 834         } else {
 835                 connman_info("RULE %p  match %p  target %p  size %d", entry,
 836                         entry->elems,
 837                         (char *)entry + entry->target_offset,
 838                                 entry->next_offset);
 839         }
 840
 841         dump_match(table, entry);
 842         dump_target(table, entry);
 843         dump_ip(entry);
 844
 845         return 0;
 846 }
 847
 848 static void iptables_dump(struct connman_iptables *table)
 849 {
 850         connman_info("%s valid_hooks=0x%08x, num_entries=%u, size=%u",
 851                         table->info->name,
 852                         table->info->valid_hooks, table->info->num_entries,
 853                                 table->info->size);
 854
 855         ENTRY_ITERATE(table->blob_entries->entrytable,
 856                         table->blob_entries->size,
 857                         dump_entry, table);
 858
 859 }
 860
 861 static int iptables_get_entries(struct connman_iptables *table)
 862 {
 863         socklen_t entry_size;
 864
 865         entry_size = sizeof(struct ipt_get_entries) + table->info->size;
 866
 867         return getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_ENTRIES,
 868                                 table->blob_entries, &entry_size);
 869 }
 870
 871 static int iptables_replace(struct connman_iptables *table,
 872                                         struct ipt_replace *r)
 873 {
 874         return setsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_SET_REPLACE, r,
 875                          sizeof(*r) + r->size);
 876 }
 877
 878 static int add_entry(struct ipt_entry *entry, struct connman_iptables *table)
 879 {
 880         struct ipt_entry *new_entry;
 881         int builtin;
 882
 883         new_entry = g_try_malloc0(entry->next_offset);
 884         if (new_entry == NULL)
 885                 return -ENOMEM;
 886
 887         memcpy(new_entry, entry, entry->next_offset);
 888
 889         builtin = is_hook_entry(table, entry);
 890
 891         return iptables_add_entry(table, new_entry, NULL, builtin);
 892 }
 893
 894 static void table_cleanup(struct connman_iptables *table)
 895 {
 896         GList *list;
 897         struct connman_iptables_entry *entry;
 898
 899         close(table->ipt_sock);
 900
 901         for (list = table->entries; list; list = list->next) {
 902                 entry = list->data;
 903
 904                 g_free(entry->entry);
 905         }
 906
 907         g_list_free(table->entries);
 908         g_free(table->info);
 909         g_free(table->blob_entries);
 910         g_free(table);
 911 }
 912
 913 static struct connman_iptables *iptables_init(char *table_name)
 914 {
 915         struct connman_iptables *table;
 916         socklen_t s;
 917
 918         DBG("%s", table_name);
 919
 920         table = g_hash_table_lookup(table_hash, table_name);
 921         if (table != NULL)
 922                 return table;
 923
 924         table = g_try_new0(struct connman_iptables, 1);
 925         if (table == NULL)
 926                 return NULL;
 927
 928         table->info = g_try_new0(struct ipt_getinfo, 1);
 929         if (table->info == NULL)
 930                 goto err;
 931
 932         table->ipt_sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
 933         if (table->ipt_sock < 0)
 934                 goto err;
 935
 936         s = sizeof(*table->info);
 937         strcpy(table->info->name, table_name);
 938         if (getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_INFO,
 939                                                 table->info, &s) < 0)
 940                 goto err;
 941
 942         table->blob_entries = g_try_malloc0(sizeof(struct ipt_get_entries) +
 943                                                 table->info->size);
 944         if (table->blob_entries == NULL)
 945                 goto err;
 946
 947         strcpy(table->blob_entries->name, table_name);
 948         table->blob_entries->size = table->info->size;
 949
 950         if (iptables_get_entries(table) < 0)
 951                 goto err;
 952
 953         table->num_entries = 0;
 954         table->old_entries = table->info->num_entries;
 955         table->size = 0;
 956
 957         memcpy(table->underflow, table->info->underflow,
 958                                 sizeof(table->info->underflow));
 959         memcpy(table->hook_entry, table->info->hook_entry,
 960                                 sizeof(table->info->hook_entry));
 961
 962         ENTRY_ITERATE(table->blob_entries->entrytable,
 963                         table->blob_entries->size,
 964                                 add_entry, table);
 965
 966         g_hash_table_insert(table_hash, g_strdup(table_name), table);
 967
 968         return table;
 969
 970 err:
 971
 972         table_cleanup(table);
 973
 974         return NULL;
 975 }
 976
 977 static struct option iptables_opts[] = {
 978         {.name = "append",        .has_arg = 1, .val = 'A'},
 979         {.name = "flush-chain",   .has_arg = 1, .val = 'F'},
 980         {.name = "list",          .has_arg = 2, .val = 'L'},
 981         {.name = "new-chain",     .has_arg = 1, .val = 'N'},
 982         {.name = "destination",   .has_arg = 1, .val = 'd'},
 983         {.name = "in-interface",  .has_arg = 1, .val = 'i'},
 984         {.name = "jump",          .has_arg = 1, .val = 'j'},
 985         {.name = "match",         .has_arg = 1, .val = 'm'},
 986         {.name = "out-interface", .has_arg = 1, .val = 'o'},
 987         {.name = "source",        .has_arg = 1, .val = 's'},
 988         {.name = "table",         .has_arg = 1, .val = 't'},
 989         {NULL},
 990 };
 991
 992 struct xtables_globals iptables_globals = {
 993         .option_offset = 0,
 994         .opts = iptables_opts,
 995         .orig_opts = iptables_opts,
 996 };
 997
 998 static int iptables_command(int argc, char *argv[])
 999 {
1000         struct connman_iptables *table;
1001         struct xtables_match *xt_m;
1002         struct xtables_target *xt_t;
1003         struct ipt_ip ip;
1004         char *table_name, *chain, *new_chain, *match_name, *target_name;
1005         char *flush_chain;
1006         int c, ret, in_len, out_len;
1007         size_t size;
1008         gboolean dump, invert;
1009         struct in_addr src, dst;
1010
1011         if (argc == 0)
1012                 return -EINVAL;
1013
1014         dump = FALSE;
1015         invert = FALSE;
1016         table_name = chain = new_chain = match_name = target_name = NULL;
1017         flush_chain = NULL;
1018         memset(&ip, 0, sizeof(struct ipt_ip));
1019         table = NULL;
1020         xt_m = NULL;
1021         xt_t = NULL;
1022         ret = 0;
1023
1024         optind = 0;
1025
1026         while ((c = getopt_long(argc, argv,
1027            "-A:F:L::N:d:j:i:m:o:s:t:", iptables_globals.opts, NULL)) != -1) {
1028                 switch (c) {
1029                 case 'A':
1030                         chain = optarg;
1031                         break;
1032
1033                 case 'F':
1034                         flush_chain = optarg;
1035                         break;
1036
1037                 case 'L':
1038                         dump = TRUE;
1039                         break;
1040
1041                 case 'N':
1042                         new_chain = optarg;
1043                         break;
1044
1045                 case 'd':
1046                         if (!inet_pton(AF_INET, optarg, &dst))
1047                                 break;
1048
1049                         ip.dst = dst;
1050                         inet_pton(AF_INET, "255.255.255.255", &ip.dmsk);
1051
1052                         if (invert)
1053                                 ip.invflags |= IPT_INV_DSTIP;
1054
1055                         break;
1056
1057                 case 'i':
1058                         in_len = strlen(optarg);
1059
1060                         if (in_len + 1 > IFNAMSIZ)
1061                                 break;
1062
1063                         strcpy(ip.iniface, optarg);
1064                         memset(ip.iniface_mask, 0xff, in_len + 1);
1065
1066                         if (invert)
1067                                 ip.invflags |= IPT_INV_VIA_IN;
1068
1069                         break;
1070
1071                 case 'j':
1072                         target_name = optarg;
1073                         xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
1074
1075                         if (xt_t == NULL)
1076                                 break;
1077
1078                         size = ALIGN(sizeof(struct ipt_entry_target)) +
1079                                                                 xt_t->size;
1080
1081                         xt_t->t = g_try_malloc0(size);
1082                         if (xt_t->t == NULL)
1083                                 goto out;
1084                         xt_t->t->u.target_size = size;
1085                         strcpy(xt_t->t->u.user.name, target_name);
1086                         xt_t->t->u.user.revision = xt_t->revision;
1087                         if (xt_t->init != NULL)
1088                                 xt_t->init(xt_t->t);
1089                         iptables_globals.opts =
1090                                 xtables_merge_options(iptables_globals.opts,
1091                                                      xt_t->extra_opts,
1092                                                      &xt_t->option_offset);
1093                         if (iptables_globals.opts == NULL)
1094                                 goto out;
1095
1096                         break;
1097
1098                 case 'm':
1099                         match_name = optarg;
1100
1101                         xt_m = xtables_find_match(optarg, XTF_LOAD_MUST_SUCCEED, NULL);
1102                         size = ALIGN(sizeof(struct ipt_entry_match)) +
1103                                                                 xt_m->size;
1104                         xt_m->m = g_try_malloc0(size);
1105                         if (xt_m == NULL)
1106                                 goto out;
1107                         xt_m->m->u.match_size = size;
1108                         strcpy(xt_m->m->u.user.name, xt_m->name);
1109                         xt_m->m->u.user.revision = xt_m->revision;
1110                         if (xt_m->init != NULL)
1111                                 xt_m->init(xt_m->m);
1112                         if (xt_m != xt_m->next) {
1113                                 iptables_globals.opts =
1114                                 xtables_merge_options(iptables_globals.opts,
1115                                                 xt_m->extra_opts,
1116                                                 &xt_m->option_offset);
1117                                 if (iptables_globals.opts == NULL)
1118                                         goto out;
1119                         }
1120
1121                         break;
1122
1123                 case 'o':
1124                         out_len = strlen(optarg);
1125
1126                         if (out_len + 1 > IFNAMSIZ)
1127                                 break;
1128
1129                         strcpy(ip.outiface, optarg);
1130                         memset(ip.outiface_mask, 0xff, out_len + 1);
1131
1132                         if (invert)
1133                                 ip.invflags |= IPT_INV_VIA_OUT;
1134
1135                         break;
1136
1137                 case 's':
1138                         if (!inet_pton(AF_INET, optarg, &src))
1139                                 break;
1140
1141                         ip.src = src;
1142                         inet_pton(AF_INET, "255.255.255.255", &ip.smsk);
1143
1144                         if (invert)
1145                                 ip.invflags |= IPT_INV_SRCIP;
1146
1147                         break;
1148
1149                 case 't':
1150                         table_name = optarg;
1151                         break;
1152
1153                 case 1:
1154                         if (optarg[0] == '!' && optarg[1] == '\0') {
1155                                 invert = TRUE;
1156                                 optarg[0] = '\0';
1157                                 continue;
1158                         }
1159
1160                         connman_error("Invalid option");
1161
1162                         ret = -EINVAL;
1163                         goto out;
1164
1165                 default:
1166                         if (xt_t == NULL || xt_t->parse == NULL ||
1167                             !xt_t->parse(c - xt_t->option_offset, argv, invert,
1168                                         &xt_t->tflags, NULL, &xt_t->t)) {
1169                                 if (xt_m == NULL || xt_m->parse == NULL)
1170                                         break;
1171
1172                                 xt_m->parse(c - xt_m->option_offset, argv,
1173                                         invert, &xt_m->mflags, NULL, &xt_m->m);
1174                         }
1175
1176                         break;
1177                 }
1178
1179                 invert = FALSE;
1180         }
1181
1182         if (table_name == NULL)
1183                 table_name = "filter";
1184
1185         table = iptables_init(table_name);
1186         if (table == NULL) {
1187                 ret = -EINVAL;
1188                 goto out;
1189         }
1190
1191         if (dump) {
1192                 iptables_dump(table);
1193
1194                 ret = 0;
1195                 goto out;
1196         }
1197
1198         if (flush_chain) {
1199                 DBG("Flush chain %s", flush_chain);
1200
1201                 iptables_flush_chain(table, flush_chain);
1202
1203                 goto out;
1204         }
1205
1206         if (chain && new_chain) {
1207                 ret = -EINVAL;
1208                 goto out;
1209         }
1210
1211         if (new_chain) {
1212                 DBG("New chain %s", new_chain);
1213
1214                 ret = iptables_add_chain(table, new_chain);
1215                 goto out;
1216         }
1217
1218         if (chain) {
1219                 if (target_name == NULL)
1220                         return -1;
1221
1222                 DBG("Adding %s to %s (match %s)",
1223                                 target_name, chain, match_name);
1224
1225                 ret = iptables_add_rule(table, &ip, chain, target_name, xt_t,
1226                                         match_name, xt_m);
1227
1228                 goto out;
1229         }
1230
1231 out:
1232         if (xt_t)
1233                 g_free(xt_t->t);
1234
1235         if (xt_m)
1236                 g_free(xt_m->m);
1237
1238         return ret;
1239 }
1240
1241 int __connman_iptables_command(const char *format, ...)
1242 {
1243         char **argv, **arguments, *command;
1244         int argc, i, ret;
1245         va_list args;
1246
1247         if (format == NULL)
1248                 return -EINVAL;
1249
1250         va_start(args, format);
1251
1252         command = g_strdup_vprintf(format, args);
1253
1254         va_end(args);
1255
1256         if (command == NULL)
1257                 return -ENOMEM;
1258
1259         arguments = g_strsplit_set(command, " ", -1);
1260
1261         for (argc = 0; arguments[argc]; argc++);
1262         ++argc;
1263
1264         DBG("command %s argc %d", command, argc);
1265
1266         argv = g_try_malloc0(argc * sizeof(char *));
1267         if (argv == NULL) {
1268                 g_free(command);
1269                 g_strfreev(arguments);
1270                 return -ENOMEM;
1271         }
1272
1273         argv[0] = "iptables";
1274         for (i = 1; i < argc; i++)
1275                 argv[i] = arguments[i - 1];
1276
1277         ret = iptables_command(argc, argv);
1278
1279         g_free(command);
1280         g_strfreev(arguments);
1281         g_free(argv);
1282
1283         return ret;
1284 }
1285
1286
1287 int __connman_iptables_commit(const char *table_name)
1288 {
1289         struct connman_iptables *table;
1290         struct ipt_replace *repl;
1291
1292         DBG("%s", table_name);
1293
1294         table = g_hash_table_lookup(table_hash, table_name);
1295         if (table == NULL)
1296                 return -EINVAL;
1297
1298         repl = iptables_blob(table);
1299
1300         return iptables_replace(table, repl);
1301 }
1302
1303 static void remove_table(gpointer user_data)
1304 {
1305         struct connman_iptables *table = user_data;
1306
1307         table_cleanup(table);
1308 }
1309
1310 int __connman_iptables_init(void)
1311 {
1312         DBG("");
1313
1314         table_hash = g_hash_table_new_full(g_str_hash, g_str_equal,
1315                                                 g_free, remove_table);
1316
1317         xtables_init_all(&iptables_globals, NFPROTO_IPV4);
1318
1319         return 0;
1320
1321 }
1322
1323 void __connman_iptables_cleanup(void)
1324 {
1325         g_hash_table_destroy(table_hash);
1326
1327         xtables_free_opts(1);
1328 }