net/netfilter/x_tables.c

   1 /*
   2  * x_tables core - Backend for {ip,ip6,arp}_tables
   3  *
   4  * Copyright (C) 2006-2006 Harald Welte <laforge@netfilter.org>
   5  *
   6  * Based on existing ip_tables code which is
   7  *   Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
   8  *   Copyright (C) 2000-2005 Netfilter Core Team <coreteam@netfilter.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/socket.h>
  18 #include <linux/net.h>
  19 #include <linux/proc_fs.h>
  20 #include <linux/seq_file.h>
  21 #include <linux/string.h>
  22 #include <linux/vmalloc.h>
  23 #include <linux/mutex.h>
  24
  25 #include <linux/netfilter/x_tables.h>
  26 #include <linux/netfilter_arp.h>
  27
  28
  29 MODULE_LICENSE("GPL");
  30 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
  31 MODULE_DESCRIPTION("[ip,ip6,arp]_tables backend module");
  32
  33 #define SMP_ALIGN(x) (((x) + SMP_CACHE_BYTES-1) & ~(SMP_CACHE_BYTES-1))
  34
  35 struct xt_af {
  36         struct mutex mutex;
  37         struct list_head match;
  38         struct list_head target;
  39         struct list_head tables;
  40         struct mutex compat_mutex;
  41 };
  42
  43 static struct xt_af *xt;
  44
  45 #ifdef DEBUG_IP_FIREWALL_USER
  46 #define duprintf(format, args...) printk(format , ## args)
  47 #else
  48 #define duprintf(format, args...)
  49 #endif
  50
  51 enum {
  52         TABLE,
  53         TARGET,
  54         MATCH,
  55 };
  56
  57 static const char *xt_prefix[NPROTO] = {
  58         [AF_INET]       = "ip",
  59         [AF_INET6]      = "ip6",
  60         [NF_ARP]        = "arp",
  61 };
  62
  63 /* Registration hooks for targets. */
  64 int
  65 xt_register_target(struct xt_target *target)
  66 {
  67         int ret, af = target->family;
  68
  69         ret = mutex_lock_interruptible(&xt[af].mutex);
  70         if (ret != 0)
  71                 return ret;
  72         list_add(&target->list, &xt[af].target);
  73         mutex_unlock(&xt[af].mutex);
  74         return ret;
  75 }
  76 EXPORT_SYMBOL(xt_register_target);
  77
  78 void
  79 xt_unregister_target(struct xt_target *target)
  80 {
  81         int af = target->family;
  82
  83         mutex_lock(&xt[af].mutex);
  84         LIST_DELETE(&xt[af].target, target);
  85         mutex_unlock(&xt[af].mutex);
  86 }
  87 EXPORT_SYMBOL(xt_unregister_target);
  88
  89 int
  90 xt_register_match(struct xt_match *match)
  91 {
  92         int ret, af = match->family;
  93
  94         ret = mutex_lock_interruptible(&xt[af].mutex);
  95         if (ret != 0)
  96                 return ret;
  97
  98         list_add(&match->list, &xt[af].match);
  99         mutex_unlock(&xt[af].mutex);
 100
 101         return ret;
 102 }
 103 EXPORT_SYMBOL(xt_register_match);
 104
 105 void
 106 xt_unregister_match(struct xt_match *match)
 107 {
 108         int af =  match->family;
 109
 110         mutex_lock(&xt[af].mutex);
 111         LIST_DELETE(&xt[af].match, match);
 112         mutex_unlock(&xt[af].mutex);
 113 }
 114 EXPORT_SYMBOL(xt_unregister_match);
 115
 116
 117 /*
 118  * These are weird, but module loading must not be done with mutex
 119  * held (since they will register), and we have to have a single
 120  * function to use try_then_request_module().
 121  */
 122
 123 /* Find match, grabs ref.  Returns ERR_PTR() on error. */
 124 struct xt_match *xt_find_match(int af, const char *name, u8 revision)
 125 {
 126         struct xt_match *m;
 127         int err = 0;
 128
 129         if (mutex_lock_interruptible(&xt[af].mutex) != 0)
 130                 return ERR_PTR(-EINTR);
 131
 132         list_for_each_entry(m, &xt[af].match, list) {
 133                 if (strcmp(m->name, name) == 0) {
 134                         if (m->revision == revision) {
 135                                 if (try_module_get(m->me)) {
 136                                         mutex_unlock(&xt[af].mutex);
 137                                         return m;
 138                                 }
 139                         } else
 140                                 err = -EPROTOTYPE; /* Found something. */
 141                 }
 142         }
 143         mutex_unlock(&xt[af].mutex);
 144         return ERR_PTR(err);
 145 }
 146 EXPORT_SYMBOL(xt_find_match);
 147
 148 /* Find target, grabs ref.  Returns ERR_PTR() on error. */
 149 struct xt_target *xt_find_target(int af, const char *name, u8 revision)
 150 {
 151         struct xt_target *t;
 152         int err = 0;
 153
 154         if (mutex_lock_interruptible(&xt[af].mutex) != 0)
 155                 return ERR_PTR(-EINTR);
 156
 157         list_for_each_entry(t, &xt[af].target, list) {
 158                 if (strcmp(t->name, name) == 0) {
 159                         if (t->revision == revision) {
 160                                 if (try_module_get(t->me)) {
 161                                         mutex_unlock(&xt[af].mutex);
 162                                         return t;
 163                                 }
 164                         } else
 165                                 err = -EPROTOTYPE; /* Found something. */
 166                 }
 167         }
 168         mutex_unlock(&xt[af].mutex);
 169         return ERR_PTR(err);
 170 }
 171 EXPORT_SYMBOL(xt_find_target);
 172
 173 struct xt_target *xt_request_find_target(int af, const char *name, u8 revision)
 174 {
 175         struct xt_target *target;
 176
 177         target = try_then_request_module(xt_find_target(af, name, revision),
 178                                          "%st_%s", xt_prefix[af], name);
 179         if (IS_ERR(target) || !target)
 180                 return NULL;
 181         return target;
 182 }
 183 EXPORT_SYMBOL_GPL(xt_request_find_target);
 184
 185 static int match_revfn(int af, const char *name, u8 revision, int *bestp)
 186 {
 187         struct xt_match *m;
 188         int have_rev = 0;
 189
 190         list_for_each_entry(m, &xt[af].match, list) {
 191                 if (strcmp(m->name, name) == 0) {
 192                         if (m->revision > *bestp)
 193                                 *bestp = m->revision;
 194                         if (m->revision == revision)
 195                                 have_rev = 1;
 196                 }
 197         }
 198         return have_rev;
 199 }
 200
 201 static int target_revfn(int af, const char *name, u8 revision, int *bestp)
 202 {
 203         struct xt_target *t;
 204         int have_rev = 0;
 205
 206         list_for_each_entry(t, &xt[af].target, list) {
 207                 if (strcmp(t->name, name) == 0) {
 208                         if (t->revision > *bestp)
 209                                 *bestp = t->revision;
 210                         if (t->revision == revision)
 211                                 have_rev = 1;
 212                 }
 213         }
 214         return have_rev;
 215 }
 216
 217 /* Returns true or false (if no such extension at all) */
 218 int xt_find_revision(int af, const char *name, u8 revision, int target,
 219                      int *err)
 220 {
 221         int have_rev, best = -1;
 222
 223         if (mutex_lock_interruptible(&xt[af].mutex) != 0) {
 224                 *err = -EINTR;
 225                 return 1;
 226         }
 227         if (target == 1)
 228                 have_rev = target_revfn(af, name, revision, &best);
 229         else
 230                 have_rev = match_revfn(af, name, revision, &best);
 231         mutex_unlock(&xt[af].mutex);
 232
 233         /* Nothing at all?  Return 0 to try loading module. */
 234         if (best == -1) {
 235                 *err = -ENOENT;
 236                 return 0;
 237         }
 238
 239         *err = best;
 240         if (!have_rev)
 241                 *err = -EPROTONOSUPPORT;
 242         return 1;
 243 }
 244 EXPORT_SYMBOL_GPL(xt_find_revision);
 245
 246 int xt_check_match(const struct xt_match *match, unsigned short family,
 247                    unsigned int size, const char *table, unsigned int hook_mask,
 248                    unsigned short proto, int inv_proto)
 249 {
 250         if (XT_ALIGN(match->matchsize) != size) {
 251                 printk("%s_tables: %s match: invalid size %Zu != %u\n",
 252                        xt_prefix[family], match->name,
 253                        XT_ALIGN(match->matchsize), size);
 254                 return -EINVAL;
 255         }
 256         if (match->table && strcmp(match->table, table)) {
 257                 printk("%s_tables: %s match: only valid in %s table, not %s\n",
 258                        xt_prefix[family], match->name, match->table, table);
 259                 return -EINVAL;
 260         }
 261         if (match->hooks && (hook_mask & ~match->hooks) != 0) {
 262                 printk("%s_tables: %s match: bad hook_mask %u\n",
 263                        xt_prefix[family], match->name, hook_mask);
 264                 return -EINVAL;
 265         }
 266         if (match->proto && (match->proto != proto || inv_proto)) {
 267                 printk("%s_tables: %s match: only valid for protocol %u\n",
 268                        xt_prefix[family], match->name, match->proto);
 269                 return -EINVAL;
 270         }
 271         return 0;
 272 }
 273 EXPORT_SYMBOL_GPL(xt_check_match);
 274
 275 #ifdef CONFIG_COMPAT
 276 int xt_compat_match(void *match, void **dstptr, int *size, int convert)
 277 {
 278         struct xt_match *m;
 279         struct compat_xt_entry_match *pcompat_m;
 280         struct xt_entry_match *pm;
 281         u_int16_t msize;
 282         int off, ret;
 283
 284         ret = 0;
 285         m = ((struct xt_entry_match *)match)->u.kernel.match;
 286         off = XT_ALIGN(m->matchsize) - COMPAT_XT_ALIGN(m->matchsize);
 287         switch (convert) {
 288                 case COMPAT_TO_USER:
 289                         pm = (struct xt_entry_match *)match;
 290                         msize = pm->u.user.match_size;
 291                         if (copy_to_user(*dstptr, pm, msize)) {
 292                                 ret = -EFAULT;
 293                                 break;
 294                         }
 295                         msize -= off;
 296                         if (put_user(msize, (u_int16_t *)*dstptr))
 297                                 ret = -EFAULT;
 298                         *size -= off;
 299                         *dstptr += msize;
 300                         break;
 301                 case COMPAT_FROM_USER:
 302                         pcompat_m = (struct compat_xt_entry_match *)match;
 303                         pm = (struct xt_entry_match *)*dstptr;
 304                         msize = pcompat_m->u.user.match_size;
 305                         memcpy(pm, pcompat_m, msize);
 306                         msize += off;
 307                         pm->u.user.match_size = msize;
 308                         *size += off;
 309                         *dstptr += msize;
 310                         break;
 311                 case COMPAT_CALC_SIZE:
 312                         *size += off;
 313                         break;
 314                 default:
 315                         ret = -ENOPROTOOPT;
 316                         break;
 317         }
 318         return ret;
 319 }
 320 EXPORT_SYMBOL_GPL(xt_compat_match);
 321 #endif
 322
 323 int xt_check_target(const struct xt_target *target, unsigned short family,
 324                     unsigned int size, const char *table, unsigned int hook_mask,
 325                     unsigned short proto, int inv_proto)
 326 {
 327         if (XT_ALIGN(target->targetsize) != size) {
 328                 printk("%s_tables: %s target: invalid size %Zu != %u\n",
 329                        xt_prefix[family], target->name,
 330                        XT_ALIGN(target->targetsize), size);
 331                 return -EINVAL;
 332         }
 333         if (target->table && strcmp(target->table, table)) {
 334                 printk("%s_tables: %s target: only valid in %s table, not %s\n",
 335                        xt_prefix[family], target->name, target->table, table);
 336                 return -EINVAL;
 337         }
 338         if (target->hooks && (hook_mask & ~target->hooks) != 0) {
 339                 printk("%s_tables: %s target: bad hook_mask %u\n",
 340                        xt_prefix[family], target->name, hook_mask);
 341                 return -EINVAL;
 342         }
 343         if (target->proto && (target->proto != proto || inv_proto)) {
 344                 printk("%s_tables: %s target: only valid for protocol %u\n",
 345                        xt_prefix[family], target->name, target->proto);
 346                 return -EINVAL;
 347         }
 348         return 0;
 349 }
 350 EXPORT_SYMBOL_GPL(xt_check_target);
 351
 352 #ifdef CONFIG_COMPAT
 353 int xt_compat_target(void *target, void **dstptr, int *size, int convert)
 354 {
 355         struct xt_target *t;
 356         struct compat_xt_entry_target *pcompat;
 357         struct xt_entry_target *pt;
 358         u_int16_t tsize;
 359         int off, ret;
 360
 361         ret = 0;
 362         t = ((struct xt_entry_target *)target)->u.kernel.target;
 363         off = XT_ALIGN(t->targetsize) - COMPAT_XT_ALIGN(t->targetsize);
 364         switch (convert) {
 365                 case COMPAT_TO_USER:
 366                         pt = (struct xt_entry_target *)target;
 367                         tsize = pt->u.user.target_size;
 368                         if (copy_to_user(*dstptr, pt, tsize)) {
 369                                 ret = -EFAULT;
 370                                 break;
 371                         }
 372                         tsize -= off;
 373                         if (put_user(tsize, (u_int16_t *)*dstptr))
 374                                 ret = -EFAULT;
 375                         *size -= off;
 376                         *dstptr += tsize;
 377                         break;
 378                 case COMPAT_FROM_USER:
 379                         pcompat = (struct compat_xt_entry_target *)target;
 380                         pt = (struct xt_entry_target *)*dstptr;
 381                         tsize = pcompat->u.user.target_size;
 382                         memcpy(pt, pcompat, tsize);
 383                         tsize += off;
 384                         pt->u.user.target_size = tsize;
 385                         *size += off;
 386                         *dstptr += tsize;
 387                         break;
 388                 case COMPAT_CALC_SIZE:
 389                         *size += off;
 390                         break;
 391                 default:
 392                         ret = -ENOPROTOOPT;
 393                         break;
 394         }
 395         return ret;
 396 }
 397 EXPORT_SYMBOL_GPL(xt_compat_target);
 398 #endif
 399
 400 struct xt_table_info *xt_alloc_table_info(unsigned int size)
 401 {
 402         struct xt_table_info *newinfo;
 403         int cpu;
 404
 405         /* Pedantry: prevent them from hitting BUG() in vmalloc.c --RR */
 406         if ((SMP_ALIGN(size) >> PAGE_SHIFT) + 2 > num_physpages)
 407                 return NULL;
 408
 409         newinfo = kzalloc(sizeof(struct xt_table_info), GFP_KERNEL);
 410         if (!newinfo)
 411                 return NULL;
 412
 413         newinfo->size = size;
 414
 415         for_each_possible_cpu(cpu) {
 416                 if (size <= PAGE_SIZE)
 417                         newinfo->entries[cpu] = kmalloc_node(size,
 418                                                         GFP_KERNEL,
 419                                                         cpu_to_node(cpu));
 420                 else
 421                         newinfo->entries[cpu] = vmalloc_node(size,
 422                                                         cpu_to_node(cpu));
 423
 424                 if (newinfo->entries[cpu] == NULL) {
 425                         xt_free_table_info(newinfo);
 426                         return NULL;
 427                 }
 428         }
 429
 430         return newinfo;
 431 }
 432 EXPORT_SYMBOL(xt_alloc_table_info);
 433
 434 void xt_free_table_info(struct xt_table_info *info)
 435 {
 436         int cpu;
 437
 438         for_each_possible_cpu(cpu) {
 439                 if (info->size <= PAGE_SIZE)
 440                         kfree(info->entries[cpu]);
 441                 else
 442                         vfree(info->entries[cpu]);
 443         }
 444         kfree(info);
 445 }
 446 EXPORT_SYMBOL(xt_free_table_info);
 447
 448 /* Find table by name, grabs mutex & ref.  Returns ERR_PTR() on error. */
 449 struct xt_table *xt_find_table_lock(int af, const char *name)
 450 {
 451         struct xt_table *t;
 452
 453         if (mutex_lock_interruptible(&xt[af].mutex) != 0)
 454                 return ERR_PTR(-EINTR);
 455
 456         list_for_each_entry(t, &xt[af].tables, list)
 457                 if (strcmp(t->name, name) == 0 && try_module_get(t->me))
 458                         return t;
 459         mutex_unlock(&xt[af].mutex);
 460         return NULL;
 461 }
 462 EXPORT_SYMBOL_GPL(xt_find_table_lock);
 463
 464 void xt_table_unlock(struct xt_table *table)
 465 {
 466         mutex_unlock(&xt[table->af].mutex);
 467 }
 468 EXPORT_SYMBOL_GPL(xt_table_unlock);
 469
 470 #ifdef CONFIG_COMPAT
 471 void xt_compat_lock(int af)
 472 {
 473         mutex_lock(&xt[af].compat_mutex);
 474 }
 475 EXPORT_SYMBOL_GPL(xt_compat_lock);
 476
 477 void xt_compat_unlock(int af)
 478 {
 479         mutex_unlock(&xt[af].compat_mutex);
 480 }
 481 EXPORT_SYMBOL_GPL(xt_compat_unlock);
 482 #endif
 483
 484 struct xt_table_info *
 485 xt_replace_table(struct xt_table *table,
 486               unsigned int num_counters,
 487               struct xt_table_info *newinfo,
 488               int *error)
 489 {
 490         struct xt_table_info *oldinfo, *private;
 491
 492         /* Do the substitution. */
 493         write_lock_bh(&table->lock);
 494         private = table->private;
 495         /* Check inside lock: is the old number correct? */
 496         if (num_counters != private->number) {
 497                 duprintf("num_counters != table->private->number (%u/%u)\n",
 498                          num_counters, private->number);
 499                 write_unlock_bh(&table->lock);
 500                 *error = -EAGAIN;
 501                 return NULL;
 502         }
 503         oldinfo = private;
 504         table->private = newinfo;
 505         newinfo->initial_entries = oldinfo->initial_entries;
 506         write_unlock_bh(&table->lock);
 507
 508         return oldinfo;
 509 }
 510 EXPORT_SYMBOL_GPL(xt_replace_table);
 511
 512 int xt_register_table(struct xt_table *table,
 513                       struct xt_table_info *bootstrap,
 514                       struct xt_table_info *newinfo)
 515 {
 516         int ret;
 517         struct xt_table_info *private;
 518
 519         ret = mutex_lock_interruptible(&xt[table->af].mutex);
 520         if (ret != 0)
 521                 return ret;
 522
 523         /* Don't autoload: we'd eat our tail... */
 524         if (list_named_find(&xt[table->af].tables, table->name)) {
 525                 ret = -EEXIST;
 526                 goto unlock;
 527         }
 528
 529         /* Simplifies replace_table code. */
 530         table->private = bootstrap;
 531         rwlock_init(&table->lock);
 532         if (!xt_replace_table(table, 0, newinfo, &ret))
 533                 goto unlock;
 534
 535         private = table->private;
 536         duprintf("table->private->number = %u\n", private->number);
 537
 538         /* save number of initial entries */
 539         private->initial_entries = private->number;
 540
 541         list_prepend(&xt[table->af].tables, table);
 542
 543         ret = 0;
 544  unlock:
 545         mutex_unlock(&xt[table->af].mutex);
 546         return ret;
 547 }
 548 EXPORT_SYMBOL_GPL(xt_register_table);
 549
 550 void *xt_unregister_table(struct xt_table *table)
 551 {
 552         struct xt_table_info *private;
 553
 554         mutex_lock(&xt[table->af].mutex);
 555         private = table->private;
 556         LIST_DELETE(&xt[table->af].tables, table);
 557         mutex_unlock(&xt[table->af].mutex);
 558
 559         return private;
 560 }
 561 EXPORT_SYMBOL_GPL(xt_unregister_table);
 562
 563 #ifdef CONFIG_PROC_FS
 564 static char *xt_proto_prefix[NPROTO] = {
 565         [AF_INET]       = "ip",
 566         [AF_INET6]      = "ip6",
 567         [NF_ARP]        = "arp",
 568 };
 569
 570 static struct list_head *xt_get_idx(struct list_head *list, struct seq_file *seq, loff_t pos)
 571 {
 572         struct list_head *head = list->next;
 573
 574         if (!head || list_empty(list))
 575                 return NULL;
 576
 577         while (pos && (head = head->next)) {
 578                 if (head == list)
 579                         return NULL;
 580                 pos--;
 581         }
 582         return pos ? NULL : head;
 583 }
 584
 585 static struct list_head *type2list(u_int16_t af, u_int16_t type)
 586 {
 587         struct list_head *list;
 588
 589         switch (type) {
 590         case TARGET:
 591                 list = &xt[af].target;
 592                 break;
 593         case MATCH:
 594                 list = &xt[af].match;
 595                 break;
 596         case TABLE:
 597                 list = &xt[af].tables;
 598                 break;
 599         default:
 600                 list = NULL;
 601                 break;
 602         }
 603
 604         return list;
 605 }
 606
 607 static void *xt_tgt_seq_start(struct seq_file *seq, loff_t *pos)
 608 {
 609         struct proc_dir_entry *pde = (struct proc_dir_entry *) seq->private;
 610         u_int16_t af = (unsigned long)pde->data & 0xffff;
 611         u_int16_t type = (unsigned long)pde->data >> 16;
 612         struct list_head *list;
 613
 614         if (af >= NPROTO)
 615                 return NULL;
 616
 617         list = type2list(af, type);
 618         if (!list)
 619                 return NULL;
 620
 621         if (mutex_lock_interruptible(&xt[af].mutex) != 0)
 622                 return NULL;
 623
 624         return xt_get_idx(list, seq, *pos);
 625 }
 626
 627 static void *xt_tgt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 628 {
 629         struct proc_dir_entry *pde = seq->private;
 630         u_int16_t af = (unsigned long)pde->data & 0xffff;
 631         u_int16_t type = (unsigned long)pde->data >> 16;
 632         struct list_head *list;
 633
 634         if (af >= NPROTO)
 635                 return NULL;
 636
 637         list = type2list(af, type);
 638         if (!list)
 639                 return NULL;
 640
 641         (*pos)++;
 642         return xt_get_idx(list, seq, *pos);
 643 }
 644
 645 static void xt_tgt_seq_stop(struct seq_file *seq, void *v)
 646 {
 647         struct proc_dir_entry *pde = seq->private;
 648         u_int16_t af = (unsigned long)pde->data & 0xffff;
 649
 650         mutex_unlock(&xt[af].mutex);
 651 }
 652
 653 static int xt_name_seq_show(struct seq_file *seq, void *v)
 654 {
 655         char *name = (char *)v + sizeof(struct list_head);
 656
 657         if (strlen(name))
 658                 return seq_printf(seq, "%s\n", name);
 659         else
 660                 return 0;
 661 }
 662
 663 static struct seq_operations xt_tgt_seq_ops = {
 664         .start  = xt_tgt_seq_start,
 665         .next   = xt_tgt_seq_next,
 666         .stop   = xt_tgt_seq_stop,
 667         .show   = xt_name_seq_show,
 668 };
 669
 670 static int xt_tgt_open(struct inode *inode, struct file *file)
 671 {
 672         int ret;
 673
 674         ret = seq_open(file, &xt_tgt_seq_ops);
 675         if (!ret) {
 676                 struct seq_file *seq = file->private_data;
 677                 struct proc_dir_entry *pde = PDE(inode);
 678
 679                 seq->private = pde;
 680         }
 681
 682         return ret;
 683 }
 684
 685 static struct file_operations xt_file_ops = {
 686         .owner   = THIS_MODULE,
 687         .open    = xt_tgt_open,
 688         .read    = seq_read,
 689         .llseek  = seq_lseek,
 690         .release = seq_release,
 691 };
 692
 693 #define FORMAT_TABLES   "_tables_names"
 694 #define FORMAT_MATCHES  "_tables_matches"
 695 #define FORMAT_TARGETS  "_tables_targets"
 696
 697 #endif /* CONFIG_PROC_FS */
 698
 699 int xt_proto_init(int af)
 700 {
 701 #ifdef CONFIG_PROC_FS
 702         char buf[XT_FUNCTION_MAXNAMELEN];
 703         struct proc_dir_entry *proc;
 704 #endif
 705
 706         if (af >= NPROTO)
 707                 return -EINVAL;
 708
 709
 710 #ifdef CONFIG_PROC_FS
 711         strlcpy(buf, xt_proto_prefix[af], sizeof(buf));
 712         strlcat(buf, FORMAT_TABLES, sizeof(buf));
 713         proc = proc_net_fops_create(buf, 0440, &xt_file_ops);
 714         if (!proc)
 715                 goto out;
 716         proc->data = (void *) ((unsigned long) af | (TABLE << 16));
 717
 718
 719         strlcpy(buf, xt_proto_prefix[af], sizeof(buf));
 720         strlcat(buf, FORMAT_MATCHES, sizeof(buf));
 721         proc = proc_net_fops_create(buf, 0440, &xt_file_ops);
 722         if (!proc)
 723                 goto out_remove_tables;
 724         proc->data = (void *) ((unsigned long) af | (MATCH << 16));
 725
 726         strlcpy(buf, xt_proto_prefix[af], sizeof(buf));
 727         strlcat(buf, FORMAT_TARGETS, sizeof(buf));
 728         proc = proc_net_fops_create(buf, 0440, &xt_file_ops);
 729         if (!proc)
 730                 goto out_remove_matches;
 731         proc->data = (void *) ((unsigned long) af | (TARGET << 16));
 732 #endif
 733
 734         return 0;
 735
 736 #ifdef CONFIG_PROC_FS
 737 out_remove_matches:
 738         strlcpy(buf, xt_proto_prefix[af], sizeof(buf));
 739         strlcat(buf, FORMAT_MATCHES, sizeof(buf));
 740         proc_net_remove(buf);
 741
 742 out_remove_tables:
 743         strlcpy(buf, xt_proto_prefix[af], sizeof(buf));
 744         strlcat(buf, FORMAT_TABLES, sizeof(buf));
 745         proc_net_remove(buf);
 746 out:
 747         return -1;
 748 #endif
 749 }
 750 EXPORT_SYMBOL_GPL(xt_proto_init);
 751
 752 void xt_proto_fini(int af)
 753 {
 754 #ifdef CONFIG_PROC_FS
 755         char buf[XT_FUNCTION_MAXNAMELEN];
 756
 757         strlcpy(buf, xt_proto_prefix[af], sizeof(buf));
 758         strlcat(buf, FORMAT_TABLES, sizeof(buf));
 759         proc_net_remove(buf);
 760
 761         strlcpy(buf, xt_proto_prefix[af], sizeof(buf));
 762         strlcat(buf, FORMAT_TARGETS, sizeof(buf));
 763         proc_net_remove(buf);
 764
 765         strlcpy(buf, xt_proto_prefix[af], sizeof(buf));
 766         strlcat(buf, FORMAT_MATCHES, sizeof(buf));
 767         proc_net_remove(buf);
 768 #endif /*CONFIG_PROC_FS*/
 769 }
 770 EXPORT_SYMBOL_GPL(xt_proto_fini);
 771
 772
 773 static int __init xt_init(void)
 774 {
 775         int i;
 776
 777         xt = kmalloc(sizeof(struct xt_af) * NPROTO, GFP_KERNEL);
 778         if (!xt)
 779                 return -ENOMEM;
 780
 781         for (i = 0; i < NPROTO; i++) {
 782                 mutex_init(&xt[i].mutex);
 783 #ifdef CONFIG_COMPAT
 784                 mutex_init(&xt[i].compat_mutex);
 785 #endif
 786                 INIT_LIST_HEAD(&xt[i].target);
 787                 INIT_LIST_HEAD(&xt[i].match);
 788                 INIT_LIST_HEAD(&xt[i].tables);
 789         }
 790         return 0;
 791 }
 792
 793 static void __exit xt_fini(void)
 794 {
 795         kfree(xt);
 796 }
 797
 798 module_init(xt_init);
 799 module_exit(xt_fini);
 800