developer.intra2net.com Git - ipt_ACCOUNT/blob - linux/net/ipv4/netfilter/ipt_ACCOUNT.c

   1 /*
   2  * This is a module which is used for counting packets.
   3  */
   4 #include <linux/module.h>
   5 #include <linux/skbuff.h>
   6 #include <linux/ip.h>
   7 #include <linux/spinlock.h>
   8 #include <net/icmp.h>
   9 #include <net/udp.h>
  10 #include <net/tcp.h>
  11 #include <linux/netfilter_ipv4/ip_tables.h>
  12
  13 struct in_device;
  14 #include <net/route.h>
  15 #include <linux/netfilter_ipv4/ipt_ACCOUNT.h>
  16
  17 //#if 0
  18 #define DEBUGP printk
  19 //#else
  20 //#define DEBUGP(format, args...)
  21 //#endif
  22
  23 struct ipt_account_table *ipt_account_tables = NULL;
  24 struct ipt_account_handle *ipt_account_handles = NULL;
  25
  26 static spinlock_t ipt_account_lock = SPIN_LOCK_UNLOCKED;
  27
  28 /* Recursive free of all data structures */
  29 void ipt_account_data_free(void *data, unsigned char depth)
  30 {
  31     // Empty data set
  32     if (!data)
  33         return;
  34
  35     // Free for 8 bit network
  36     if (depth == 0)
  37     {
  38         free_page((unsigned long)data);
  39         data = NULL;
  40         return;
  41     }
  42
  43     // Free for 16 bit network
  44     if (depth == 1)
  45     {
  46         struct ipt_account_mask_16 *mask_16 = (struct ipt_account_mask_16 *)data;
  47         unsigned char b;
  48         for (b=0; b < 255; b++)
  49         {
  50             if (mask_16->mask_24[b] != 0)
  51             {
  52                 free_page((unsigned long)mask_16->mask_24[b]);
  53                 mask_16->mask_24[b] = NULL;
  54             }
  55         }
  56         free_page((unsigned long)data);
  57         data = NULL;
  58         return;
  59     }
  60
  61     // Free for 24 bit network
  62     if (depth == 3)
  63     {
  64         unsigned char a, b;
  65         for (a=0; a < 255; a++)
  66         {
  67             if (((struct ipt_account_mask_8 *)data)->mask_16[a])
  68             {
  69                 struct ipt_account_mask_16 *mask_16 = (struct ipt_account_mask_16*)((struct ipt_account_mask_8 *)data)->mask_16[a];
  70                 for (b=0; b < 255; b++)
  71                 {
  72                     if (mask_16->mask_24[b]) {
  73                         free_page((unsigned long)mask_16->mask_24[b]);
  74                         mask_16->mask_24[b] = NULL;
  75                     }
  76                 }
  77                 free_page((unsigned long)mask_16);
  78                 mask_16 = NULL;
  79             }
  80         }
  81         free_page((unsigned long)data);
  82         data = NULL;
  83         return;
  84     }
  85
  86     printk("ACCOUNT: ipt_account_data_free called with unknown depth: %d\n", depth);
  87     return;
  88 }
  89
  90 /* Look for existing table / insert new one. Return internal ID or -1 on error */
  91 int ipt_account_table_insert(char *name, unsigned int ip, unsigned int netmask)
  92 {
  93     unsigned int i;
  94
  95     DEBUGP("ACCOUNT: ipt_account_table_insert: %s, %u.%u.%u.%u/%u.%u.%u.%u\n", name, NIPQUAD(ip), NIPQUAD(netmask));
  96
  97     // Look for existing table
  98     for (i = 0; i < ACCOUNT_MAX_TABLES; i++)
  99     {
 100         if (strncmp(ipt_account_tables[i].name, name, ACCOUNT_TABLE_NAME_LEN) == 0)
 101         {
 102             DEBUGP("ACCOUNT: Found existing slot: %d - %u.%u.%u.%u/%u.%u.%u.%u\n", i,
 103                    NIPQUAD(ipt_account_tables[i].ip), NIPQUAD(ipt_account_tables[i].netmask));
 104
 105             if (ipt_account_tables[i].ip != ip || ipt_account_tables[i].netmask != netmask)
 106             {
 107                 printk("ACCOUNT: Table %s found, but IP/netmask mismatch. IP/netmask found: %u.%u.%u.%u/%u.%u.%u.%u\n",
 108                         name, NIPQUAD(ipt_account_tables[i].ip), NIPQUAD(ipt_account_tables[i].netmask));
 109                 return -1;
 110             }
 111
 112             ipt_account_tables[i].refcount++;
 113             DEBUGP("ACCOUNT: Refcount: %d\n", ipt_account_tables[i].refcount);
 114             return i;
 115         }
 116     }
 117
 118     // Insert new table
 119     for (i = 0; i < ACCOUNT_MAX_TABLES; i++)
 120     {
 121         // Found free slot
 122         if (ipt_account_tables[i].name[0] == 0)
 123         {
 124             DEBUGP("ACCOUNT: Found free slot: %d\n", i);
 125
 126             strncpy (ipt_account_tables[i].name, name, ACCOUNT_TABLE_NAME_LEN-1);
 127
 128             ipt_account_tables[i].ip = ip;
 129             ipt_account_tables[i].netmask = netmask;
 130
 131             // Calculate netsize
 132             unsigned int j, calc_mask, netsize=0;
 133             calc_mask = htonl(netmask);
 134             for (j = 31; j > 0; j--)
 135             {
 136                 if (calc_mask&(1<<j))
 137                     netsize++;
 138                 else
 139                     break;
 140             }
 141
 142             // Calculate depth from netsize
 143             if (netsize >= 24)
 144                 ipt_account_tables[i].depth = 0;
 145             else if (netsize >= 16)
 146                 ipt_account_tables[i].depth = 1;
 147             else if(netsize >= 8)
 148                 ipt_account_tables[i].depth = 2;
 149
 150             printk("ACCOUNT: calculated netsize: %u -> ipt_account_table depth %u\n", netsize, ipt_account_tables[i].depth);
 151
 152             ipt_account_tables[i].refcount++;
 153             if (!(ipt_account_tables[i].data = (void *)get_zeroed_page(GFP_KERNEL)))
 154             {
 155                 printk("ACCOUNT: out of memory for data of table: %s\n", name);
 156                 memset(&ipt_account_tables[i], 0, sizeof(struct ipt_account_table));
 157                 return -1;
 158             }
 159
 160             return i;
 161         }
 162     }
 163
 164     // No free slot found
 165     printk("ACCOUNT: No free table slot found (max: %d). Please increase ACCOUNT_MAX_TABLES.\n", ACCOUNT_MAX_TABLES);
 166     return -1;
 167 }
 168
 169 static int ipt_account_checkentry(const char *tablename,
 170     const struct ipt_entry *e,
 171     void *targinfo,
 172     unsigned int targinfosize,
 173     unsigned int hook_mask)
 174 {
 175     struct ipt_account_info *info = targinfo;
 176
 177     if (targinfosize != IPT_ALIGN(sizeof(struct ipt_account_info))) {
 178         DEBUGP("ACCOUNT: targinfosize %u != %u\n",
 179                 targinfosize, IPT_ALIGN(sizeof(struct ipt_account_info)));
 180         return 0;
 181     }
 182
 183     spin_lock_bh(&ipt_account_lock);
 184     int table_nr = ipt_account_table_insert(info->table_name, info->net_ip, info->net_mask);
 185     if (table_nr == -1)
 186     {
 187         printk("ACCOUNT: Table insert problem. Aborting\n");
 188         spin_unlock_bh(&ipt_account_lock);
 189         return 0;
 190     }
 191     // Table nr caching so we don't have to do an extra string compare for every packet
 192     info->table_nr = table_nr;
 193
 194     spin_unlock_bh(&ipt_account_lock);
 195
 196     return 1;
 197 }
 198
 199 void ipt_account_deleteentry(void *targinfo, unsigned int targinfosize)
 200 {
 201     unsigned int i;
 202     struct ipt_account_info *info = targinfo;
 203
 204     if (targinfosize != IPT_ALIGN(sizeof(struct ipt_account_info))) {
 205         DEBUGP("ACCOUNT: targinfosize %u != %u\n",
 206                 targinfosize, IPT_ALIGN(sizeof(struct ipt_account_info)));
 207     }
 208
 209     spin_lock_bh(&ipt_account_lock);
 210
 211     DEBUGP("ACCOUNT: ipt_account_deleteentry called for table: %s (#%d)\n", info->table_name, info->table_nr);
 212
 213     info->table_nr = -1;    // Set back to original state
 214
 215     // Look for table
 216     for (i = 0; i < ACCOUNT_MAX_TABLES; i++)
 217     {
 218         if (strncmp(ipt_account_tables[i].name, info->table_name, ACCOUNT_TABLE_NAME_LEN) == 0)
 219         {
 220             DEBUGP("ACCOUNT: Found table at slot: %d\n", i);
 221
 222             ipt_account_tables[i].refcount--;
 223             DEBUGP("ACCOUNT: Refcount left: %d\n", ipt_account_tables[i].refcount);
 224
 225             // Table not needed anymore?
 226             if (ipt_account_tables[i].refcount == 0)
 227             {
 228                 DEBUGP("ACCOUNT: Destroying table at slot: %d\n", i);
 229                 ipt_account_data_free(ipt_account_tables[i].data, ipt_account_tables[i].depth);
 230                 memset(&ipt_account_tables[i], 0, sizeof(struct ipt_account_table));
 231             }
 232
 233             spin_unlock_bh(&ipt_account_lock);
 234             return;
 235         }
 236     }
 237
 238     // Table not found
 239     printk("ACCOUNT: Table %s not found for destroy\n", info->table_name);
 240     spin_unlock_bh(&ipt_account_lock);
 241 }
 242
 243 void ipt_account_depth0_insert(struct ipt_account_mask_24 *mask_24, unsigned int net_ip, unsigned int netmask,
 244                                unsigned int src_ip, unsigned int dst_ip, unsigned int size, unsigned int *itemcount)
 245 {
 246     unsigned char is_src = 0, is_dst = 0;
 247
 248     DEBUGP("ACCOUNT: ipt_account_depth0_insert: %u.%u.%u.%u/%u.%u.%u.%u for net %u.%u.%u.%u/%u.%u.%u.%u, size: %u\n",
 249             NIPQUAD(src_ip), NIPQUAD(dst_ip), NIPQUAD(net_ip), NIPQUAD(netmask), size);
 250
 251     // Check if src/dst is inside our network.
 252     // Special: net_ip = 0.0.0.0/0 gets stored as src in slot 0
 253     if (!netmask)
 254         src_ip = 0;
 255     if ((net_ip&netmask) == (src_ip&netmask))
 256         is_src = 1;
 257     if ((net_ip&netmask) == (dst_ip&netmask) && netmask)
 258         is_dst = 1;
 259
 260     if (!is_src && !is_dst)
 261     {
 262         DEBUGP("ACCOUNT: Skipping packet %u.%u.%u.%u/%u.%u.%u.%u for net %u.%u.%u.%u/%u.%u.%u.%u\n",
 263                 NIPQUAD(src_ip), NIPQUAD(dst_ip), NIPQUAD(net_ip), NIPQUAD(netmask));
 264         return;
 265     }
 266
 267     // Check if this entry is new
 268     char is_new_ip = 0;
 269
 270     // Increase size counters
 271     if (is_src)
 272     {
 273         // Calculate network slot
 274         unsigned char slot = (unsigned char)((src_ip&0xFF000000) >> 24);
 275         DEBUGP("ACCOUNT: Calculated SRC 8 bit network slot: %d\n", slot);
 276         if (!mask_24->ip[slot].src_packets && !mask_24->ip[slot].dst_packets)
 277             is_new_ip = 1;
 278
 279         mask_24->ip[slot].src_packets++;
 280         mask_24->ip[slot].src_bytes+=size;
 281     }
 282     if (is_dst)
 283     {
 284         unsigned char slot = (unsigned char)((dst_ip&0xFF000000) >> 24);
 285         DEBUGP("ACCOUNT: Calculated DST 8 bit network slot: %d\n", slot);
 286         if (!mask_24->ip[slot].src_packets && !mask_24->ip[slot].dst_packets)
 287             is_new_ip = 1;
 288
 289         mask_24->ip[slot].dst_packets++;
 290         mask_24->ip[slot].dst_bytes+=size;
 291     }
 292
 293     if (is_new_ip)
 294         (*itemcount)++;
 295 }
 296
 297 void ipt_account_depth1_insert(struct ipt_account_mask_16 *mask_16, unsigned int net_ip, unsigned int netmask,
 298                                unsigned int src_ip, unsigned int dst_ip, unsigned int size, unsigned int *itemcount)
 299 {
 300     // Do we need to process src IP?
 301     if ((net_ip&netmask) == (src_ip&netmask))
 302     {
 303         unsigned char slot = (unsigned char)((src_ip&0x00FF0000) >> 16);
 304         DEBUGP("ACCOUNT: Calculated SRC 16 bit network slot: %d\n", slot);
 305
 306         // Do we need to create a new mask_24 bucket?
 307         if (!mask_16->mask_24[slot] && !(mask_16->mask_24[slot] = (void *)get_zeroed_page(GFP_KERNEL)))
 308         {
 309             printk("ACCOUNT: Can't process packet because out of memory!\n");
 310             return;
 311         }
 312
 313         ipt_account_depth0_insert((struct ipt_account_mask_24 *)mask_16->mask_24[slot], net_ip, netmask,
 314                                     src_ip, dst_ip, size, itemcount);
 315     }
 316
 317     // Do we need to process dst IP?
 318     if ((net_ip&netmask) == (dst_ip&netmask))
 319     {
 320         unsigned char slot = (unsigned char)((dst_ip&0x00FF0000) >> 16);
 321         DEBUGP("ACCOUNT: Calculated DST 16 bit network slot: %d\n", slot);
 322
 323         // Do we need to create a new mask_24 bucket?
 324         if (!mask_16->mask_24[slot] && !(mask_16->mask_24[slot] = (void *)get_zeroed_page(GFP_KERNEL)))
 325         {
 326             printk("ACCOUT: Can't process packet because out of memory!\n");
 327             return;
 328         }
 329
 330         ipt_account_depth0_insert((struct ipt_account_mask_24 *)mask_16->mask_24[slot], net_ip, netmask,
 331                                     src_ip, dst_ip, size, itemcount);
 332     }
 333 }
 334
 335 void ipt_account_depth2_insert(struct ipt_account_mask_8 *mask_8, unsigned int net_ip, unsigned int netmask,
 336                                unsigned int src_ip, unsigned int dst_ip, unsigned int size, unsigned int *itemcount)
 337 {
 338     // Do we need to process src IP?
 339     if ((net_ip&netmask) == (src_ip&netmask))
 340     {
 341         unsigned char slot = (unsigned char)((src_ip&0x0000FF00) >> 8);
 342         DEBUGP("ACCOUNT: Calculated SRC 24 bit network slot: %d\n", slot);
 343
 344         // Do we need to create a new mask_24 bucket?
 345         if (!mask_8->mask_16[slot] && !(mask_8->mask_16[slot] = (void *)get_zeroed_page(GFP_KERNEL)))
 346         {
 347             printk("ACCOUNT: Can't process packet because out of memory!\n");
 348             return;
 349         }
 350
 351         ipt_account_depth1_insert((struct ipt_account_mask_16 *)mask_8->mask_16[slot], net_ip, netmask,
 352                                     src_ip, dst_ip, size, itemcount);
 353     }
 354
 355     // Do we need to process dst IP?
 356     if ((net_ip&netmask) == (dst_ip&netmask))
 357     {
 358         unsigned char slot = (unsigned char)((dst_ip&0x0000FF00) >> 8);
 359         DEBUGP("ACCOUNT: Calculated DST 24 bit network slot: %d\n", slot);
 360
 361         // Do we need to create a new mask_24 bucket?
 362         if (!mask_8->mask_16[slot] && !(mask_8->mask_16[slot] = (void *)get_zeroed_page(GFP_KERNEL)))
 363         {
 364             printk("ACCOUNT: Can't process packet because out of memory!\n");
 365             return;
 366         }
 367
 368         ipt_account_depth1_insert((struct ipt_account_mask_16 *)mask_8->mask_16[slot], net_ip, netmask,
 369                                     src_ip, dst_ip, size, itemcount);
 370     }
 371 }
 372
 373 static unsigned int ipt_account_target(struct sk_buff **pskb,
 374     unsigned int hooknum,
 375     const struct net_device *in,
 376     const struct net_device *out,
 377     const void *targinfo,
 378     void *userinfo)
 379 {
 380     const struct ipt_account_info *info = (const struct ipt_account_info *)targinfo;
 381     unsigned int src_ip = (*pskb)->nh.iph->saddr;
 382     unsigned int dst_ip = (*pskb)->nh.iph->daddr;
 383     unsigned int size = ntohs((*pskb)->nh.iph->tot_len);
 384
 385     spin_lock_bh(&ipt_account_lock);
 386
 387     if (ipt_account_tables[info->table_nr].name[0] == 0)
 388     {
 389         printk("ACCOUNT: ipt_account_target: Invalid table id %u. IPs %u.%u.%u.%u/%u.%u.%u.%u\n",
 390                info->table_nr, NIPQUAD(src_ip), NIPQUAD(dst_ip));
 391         spin_unlock_bh(&ipt_account_lock);
 392         return IPT_CONTINUE;
 393     }
 394
 395     // 8 bit network or "any" network
 396     if (ipt_account_tables[info->table_nr].depth == 0)
 397     {
 398         // Count packet and check if the IP is new
 399         ipt_account_depth0_insert((struct ipt_account_mask_24 *)ipt_account_tables[info->table_nr].data,
 400                                   ipt_account_tables[info->table_nr].ip, ipt_account_tables[info->table_nr].netmask,
 401                                   src_ip, dst_ip, size, &ipt_account_tables[info->table_nr].itemcount);
 402         spin_unlock_bh(&ipt_account_lock);
 403         return IPT_CONTINUE;
 404     }
 405
 406     // 16 bit network
 407     if (ipt_account_tables[info->table_nr].depth == 1)
 408     {
 409         ipt_account_depth1_insert((struct ipt_account_mask_16 *)ipt_account_tables[info->table_nr].data,
 410                                   ipt_account_tables[info->table_nr].ip, ipt_account_tables[info->table_nr].netmask,
 411                                   src_ip, dst_ip, size, &ipt_account_tables[info->table_nr].itemcount);
 412         spin_unlock_bh(&ipt_account_lock);
 413         return IPT_CONTINUE;
 414     }
 415
 416     // 24 bit network
 417     if (ipt_account_tables[info->table_nr].depth == 2)
 418     {
 419         ipt_account_depth2_insert((struct ipt_account_mask_8 *)ipt_account_tables[info->table_nr].data,
 420                                   ipt_account_tables[info->table_nr].ip, ipt_account_tables[info->table_nr].netmask,
 421                                   src_ip, dst_ip, size, &ipt_account_tables[info->table_nr].itemcount);
 422         spin_unlock_bh(&ipt_account_lock);
 423         return IPT_CONTINUE;
 424     }
 425
 426     printk("ACCOUNT: ipt_account_target: Unable to process packet. Table id %u. IPs %u.%u.%u.%u/%u.%u.%u.%u\n",
 427             info->table_nr, NIPQUAD(src_ip), NIPQUAD(dst_ip));
 428
 429     spin_unlock_bh(&ipt_account_lock);
 430     return IPT_CONTINUE;
 431 }
 432
 433 /*
 434     Functions dealing with "handles":
 435     Handles are snapshots of a accounting state.
 436
 437     read snapshots are only for debugging the code
 438     and are very expensive concerning speed/memory
 439     compared to read_and_flush.
 440
 441     The functions aren't protected by spinlocks themselves
 442     as this is done in the ioctl part of the code.
 443 */
 444
 445 /*
 446     Find a free handle slot. Normally only one should be used,
 447     but there could be two or more applications accessing the data
 448     at the same time.
 449 */
 450 int ipt_account_handle_find_slot(void)
 451 {
 452     unsigned int i;
 453     // Insert new table
 454     for (i = 0; i < ACCOUNT_MAX_HANDLES; i++)
 455     {
 456         // Found free slot
 457         if (ipt_account_handles[i].data == NULL)
 458         {
 459             // Don't "mark" data as used as we are protected by a spinlock by the calling function.
 460             // handle_find_slot() is only a function to prevent code duplication.
 461             return i;
 462         }
 463     }
 464
 465     // No free slot found
 466     printk("ACCOUNT: No free handle slot found (max: %u). Please increase ACCOUNT_MAX_HANDLES.\n", ACCOUNT_MAX_HANDLES);
 467     return -1;
 468 }
 469
 470 int ipt_account_handle_free(unsigned int handle)
 471 {
 472     if (handle >= ACCOUNT_MAX_HANDLES)
 473     {
 474         printk("ACCOUNT: Invalid handle for ipt_account_handle_free() specified: %u\n", handle);
 475         return -EINVAL;
 476     }
 477
 478     ipt_account_data_free(ipt_account_handles[handle].data, ipt_account_handles[handle].depth);
 479     memset (&ipt_account_handles[handle], 0, sizeof (struct ipt_account_handle));
 480     return 0;
 481 }
 482
 483 /* Prepare data for read without flush. Use only for debugging!
 484    Real applications should use read&flush as it's way more efficent */
 485 int ipt_account_handle_prepare_read(char *tablename, unsigned int *count)
 486 {
 487     int handle, i, table_nr=-1;
 488
 489     for (i = 0; i < ACCOUNT_MAX_TABLES; i++)
 490         if (strncmp(ipt_account_tables[i].name, tablename, ACCOUNT_TABLE_NAME_LEN) == 0)
 491         {
 492             table_nr = i;
 493             break;
 494         }
 495
 496     if (table_nr == -1)
 497     {
 498         printk("ACCOUNT: ipt_account_handle_prepare_read(): Table %s not found\n", tablename);
 499         return -1;
 500     }
 501
 502     // Can't find a free handle slot?
 503     if ((handle = ipt_account_handle_find_slot()) == -1)
 504         return -1;
 505
 506     // Fill up handle structure
 507     ipt_account_handles[handle].ip = ipt_account_tables[table_nr].ip;
 508     ipt_account_handles[handle].depth = ipt_account_tables[table_nr].depth;
 509     ipt_account_handles[handle].itemcount = ipt_account_tables[table_nr].itemcount;
 510
 511     // allocate "root" table
 512     if (!(ipt_account_handles[handle].data = (void*)get_zeroed_page(GFP_KERNEL)))
 513     {
 514         printk("ACCOUNT: out of memory for root table in ipt_account_handle_prepare_read()\n");
 515         memset (&ipt_account_handles[handle], 0, sizeof(struct ipt_account_handle));
 516         return -1;
 517     }
 518
 519     // Recursive copy of complete data structure
 520     unsigned int depth = ipt_account_handles[handle].depth;
 521     if (depth == 0)
 522     {
 523         memcpy(ipt_account_handles[handle].data, ipt_account_tables[table_nr].data, sizeof(struct ipt_account_mask_24));
 524     } else if (depth == 1) {
 525         struct ipt_account_mask_16 *src_16 = (struct ipt_account_mask_16 *)ipt_account_tables[table_nr].data;
 526         struct ipt_account_mask_16 *network_16 = (struct ipt_account_mask_16 *)ipt_account_handles[handle].data;
 527         unsigned char b;
 528
 529         for (b = 0; b < 255; b++)
 530         {
 531             if (src_16->mask_24[b])
 532             {
 533                 if (!(network_16->mask_24[b] = (void*)get_zeroed_page(GFP_KERNEL)))
 534                 {
 535                     printk("ACCOUNT: out of memory during copy of 16 bit network in ipt_account_handle_prepare_read()\n");
 536                     ipt_account_data_free(ipt_account_handles[handle].data, depth);
 537                     memset (&ipt_account_handles[handle], 0, sizeof(struct ipt_account_handle));
 538                     return -1;
 539                 }
 540
 541                 memcpy(network_16->mask_24[b], src_16->mask_24[b], sizeof(struct ipt_account_mask_24));
 542             }
 543         }
 544     } else if(depth == 2) {
 545         struct ipt_account_mask_8 *src_8 = (struct ipt_account_mask_8 *)ipt_account_tables[table_nr].data;
 546         struct ipt_account_mask_8 *network_8 = (struct ipt_account_mask_8 *)ipt_account_handles[handle].data;
 547         unsigned char a;
 548
 549         for (a = 0; a < 255; a++)
 550         {
 551             if (src_8->mask_16[a])
 552             {
 553                 if (!(network_8->mask_16[a] = (void*)get_zeroed_page(GFP_KERNEL)))
 554                 {
 555                     printk("ACCOUNT: out of memory during copy of 24 bit network in ipt_account_handle_prepare_read()\n");
 556                     ipt_account_data_free(ipt_account_handles[handle].data, depth);
 557                     memset (&ipt_account_handles[handle], 0, sizeof(struct ipt_account_handle));
 558                     return -1;
 559                 }
 560
 561                 memcpy(network_8->mask_16[a], src_8->mask_16[a], sizeof(struct ipt_account_mask_16));
 562
 563                 struct ipt_account_mask_16 *src_16 = src_8->mask_16[a];
 564                 struct ipt_account_mask_16 *network_16 = network_8->mask_16[a];
 565                 unsigned char b;
 566
 567                 for (b = 0; b < 255; b++)
 568                 {
 569                     if (src_16->mask_24[b])
 570                     {
 571                         if (!(network_16->mask_24[b] = (void*)get_zeroed_page(GFP_KERNEL)))
 572                         {
 573                             printk("ACCOUNT: out of memory during copy of 16 bit network in ipt_account_handle_prepare_read()\n");
 574                             ipt_account_data_free(ipt_account_handles[handle].data, depth);
 575                             memset (&ipt_account_handles[handle], 0, sizeof(struct ipt_account_handle));
 576                             return -1;
 577                         }
 578
 579                         memcpy(network_16->mask_24[b], src_16->mask_24[b], sizeof(struct ipt_account_mask_24));
 580                     }
 581                 }
 582             }
 583         }
 584     }
 585
 586     *count = ipt_account_tables[table_nr].itemcount;
 587     return handle;
 588 }
 589
 590 /* Prepare data for read and flush it */
 591 int ipt_account_handle_prepare_read_flush(char *tablename, unsigned int *count)
 592 {
 593     int handle, i, table_nr=-1;
 594
 595     for (i = 0; i < ACCOUNT_MAX_TABLES; i++)
 596         if (strncmp(ipt_account_tables[i].name, tablename, ACCOUNT_TABLE_NAME_LEN) == 0)
 597         {
 598             table_nr = i;
 599             break;
 600         }
 601
 602     if (table_nr == -1)
 603     {
 604         printk("ACCOUNT: ipt_account_handle_prepare_read_flush(): Table %s not found\n", tablename);
 605         return -1;
 606     }
 607
 608     // Can't find a free handle slot?
 609     if ((handle = ipt_account_handle_find_slot()) == -1)
 610         return -1;
 611
 612     // Fill up handle structure
 613     ipt_account_handles[handle].ip = ipt_account_tables[table_nr].ip;
 614     ipt_account_handles[handle].depth = ipt_account_tables[table_nr].depth;
 615     ipt_account_handles[handle].itemcount = ipt_account_tables[table_nr].itemcount;
 616     ipt_account_handles[handle].data = ipt_account_tables[table_nr].data;
 617     *count = ipt_account_tables[table_nr].itemcount;
 618
 619     // "Flush" table data
 620     ipt_account_tables[table_nr].data = (void*)get_zeroed_page(GFP_KERNEL);
 621     ipt_account_tables[table_nr].itemcount = 0;
 622
 623     return handle;
 624 }
 625
 626 /* Copy the actual that into a prepared buffer.
 627    We only copy entries != 0 to increase performance.
 628    The memory gets freed again in ipt_account_handle_free().
 629 */
 630 int ipt_account_handle_get_data(unsigned int handle, void *buffer)
 631 {
 632     struct ipt_account_handle_ip handle_ip;
 633     unsigned int handle_ip_size = sizeof (struct ipt_account_handle_ip);
 634     unsigned char i;
 635
 636     if (handle >= ACCOUNT_MAX_HANDLES)
 637     {
 638         printk("ACCOUNT: invalid handle for ipt_account_handle_get_data() specified: %u\n", handle);
 639         return -1;
 640     }
 641
 642     if (ipt_account_handles[handle].data == NULL)
 643     {
 644         printk("ACCOUNT: handle %u is BROKEN: Contains no data\n", handle);
 645         return -1;
 646     }
 647
 648     // Check if at least packet src/dst matches ip/netmask
 649     unsigned int net_ip = ipt_account_handles[handle].ip;
 650     unsigned int depth = ipt_account_handles[handle].depth;
 651
 652     // 8 bit network
 653     if (depth == 0)
 654     {
 655         struct ipt_account_mask_24 *network = (struct ipt_account_mask_24*)ipt_account_handles[handle].data;
 656         for (i = 0; i < 255; i++)
 657         {
 658             if (network->ip[i].src_packets || network->ip[i].dst_packets)
 659             {
 660                 handle_ip.ip = net_ip | (i<<24);
 661                 handle_ip.src_packets = network->ip[i].src_packets;
 662                 handle_ip.src_bytes = network->ip[i].src_bytes;
 663                 handle_ip.dst_packets = network->ip[i].dst_packets;
 664                 handle_ip.dst_bytes = network->ip[i].dst_bytes;
 665
 666                 copy_to_user(buffer, &handle_ip, handle_ip_size);
 667                 buffer += handle_ip_size;
 668             }
 669         }
 670
 671         return 0;
 672     }
 673
 674     // 16 bit network
 675     if (depth == 1)
 676     {
 677         struct ipt_account_mask_16 *network_16 = (struct ipt_account_mask_16*)ipt_account_handles[handle].data;
 678         unsigned char b;
 679         for (b = 0; b < 255; b++)
 680         {
 681             if (network_16->mask_24[b])
 682             {
 683                 struct ipt_account_mask_24 *network = (struct ipt_account_mask_24*)network_16->mask_24[b];
 684                 for (i = 0; i < 255; i++)
 685                 {
 686                     if (network->ip[i].src_packets || network->ip[i].dst_packets)
 687                     {
 688                         handle_ip.ip = net_ip | (b << 16) | (i<<24);
 689                         handle_ip.src_packets = network->ip[i].src_packets;
 690                         handle_ip.src_bytes = network->ip[i].src_bytes;
 691                         handle_ip.dst_packets = network->ip[i].dst_packets;
 692                         handle_ip.dst_bytes = network->ip[i].dst_bytes;
 693
 694                         copy_to_user(buffer, &handle_ip, handle_ip_size);
 695                         buffer += handle_ip_size;
 696                     }
 697                 }
 698             }
 699         }
 700
 701         return 0;
 702     }
 703
 704     // 24 bit network
 705     if (depth == 2)
 706     {
 707         struct ipt_account_mask_8 *network_8 = (struct ipt_account_mask_8*)ipt_account_handles[handle].data;
 708         unsigned char a, b;
 709         for (a = 0; a < 255; a++)
 710         {
 711             if (network_8->mask_16[a])
 712             {
 713                 struct ipt_account_mask_16 *network_16 = (struct ipt_account_mask_16*)network_8->mask_16[a];
 714                 for (b = 0; b < 255; b++)
 715                 {
 716                     if (network_16->mask_24[b])
 717                     {
 718                         struct ipt_account_mask_24 *network = (struct ipt_account_mask_24*)network_16->mask_24[b];
 719                         for (i = 0; i < 255; i++)
 720                         {
 721                             if (network->ip[i].src_packets || network->ip[i].dst_packets)
 722                             {
 723                                 handle_ip.ip = net_ip | (a << 8) | (b << 16) | (i<<24);
 724                                 handle_ip.src_packets = network->ip[i].src_packets;
 725                                 handle_ip.src_bytes = network->ip[i].src_bytes;
 726                                 handle_ip.dst_packets = network->ip[i].dst_packets;
 727                                 handle_ip.dst_bytes = network->ip[i].dst_bytes;
 728
 729                                 copy_to_user(buffer, &handle_ip, handle_ip_size);
 730                                 buffer += handle_ip_size;
 731                             }
 732                         }
 733                     }
 734                 }
 735             }
 736         }
 737
 738         return 0;
 739     }
 740
 741     return -1;
 742 }
 743
 744 static int ipt_account_set_ctl(struct sock *sk, int cmd, void *user, unsigned int len)
 745 {
 746     struct ipt_account_handle_sockopt handle;
 747     int ret = -EINVAL;
 748
 749     if (!capable(CAP_NET_ADMIN))
 750             return -EPERM;
 751
 752     switch (cmd)
 753     {
 754         case IPT_SO_SET_ACCOUNT_HANDLE_FREE:
 755             if (len != sizeof(struct ipt_account_handle_sockopt))
 756             {
 757                 printk("ACCOUNT: ipt_account_set_ctl: wrong data size (%u != %u) for IPT_SO_SET_HANDLE_FREE\n", len, sizeof(struct ipt_account_handle_sockopt));
 758                 break;
 759             }
 760
 761             if (copy_from_user (&handle, user, len))
 762             {
 763                 printk("ACCOUNT: ipt_account_set_ctl: copy_from_user failed for IPT_SO_SET_HANDLE_FREE\n");
 764                 break;
 765             }
 766
 767             spin_lock_bh(&ipt_account_lock);
 768             ret = ipt_account_handle_free(handle.handle_nr);
 769             spin_unlock_bh(&ipt_account_lock);
 770             break;
 771         default:
 772             printk("ACCOUNT: ipt_account_set_ctl: unknown request %i\n", cmd);
 773     }
 774
 775     return ret;
 776 }
 777
 778 static int ipt_account_get_ctl(struct sock *sk, int cmd, void *user, int *len)
 779 {
 780     struct ipt_account_handle_sockopt handle;
 781     int ret = -EINVAL;
 782
 783     if (!capable(CAP_NET_ADMIN))
 784             return -EPERM;
 785
 786     switch (cmd)
 787     {
 788         case IPT_SO_GET_ACCOUNT_PREPARE_READ_FLUSH:
 789         case IPT_SO_GET_ACCOUNT_PREPARE_READ:
 790             if (*len < sizeof(struct ipt_account_handle_sockopt))
 791             {
 792                 printk("ACCOUNT: ipt_account_get_ctl: wrong data size (%u != %u) for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n",
 793                        *len, sizeof(struct ipt_account_handle_sockopt));
 794                 break;
 795             }
 796
 797             if (copy_from_user (&handle, user, sizeof(struct ipt_account_handle_sockopt)))
 798             {
 799                 printk("ACCOUNT: ipt_account_get_ctl: copy_from_user failed for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n");
 800                 break;
 801             }
 802
 803             spin_lock_bh(&ipt_account_lock);
 804             if (cmd == IPT_SO_GET_ACCOUNT_PREPARE_READ_FLUSH)
 805                 handle.handle_nr = ipt_account_handle_prepare_read_flush(handle.name, &handle.itemcount);
 806             else
 807                 handle.handle_nr = ipt_account_handle_prepare_read(handle.name, &handle.itemcount);
 808             spin_unlock_bh(&ipt_account_lock);
 809
 810             if (handle.handle_nr == -1)
 811             {
 812                 printk("ACCOUNT: ipt_account_get_ctl: ipt_account_handle_prepare_read failed\n");
 813                 break;
 814             }
 815
 816             if (copy_to_user(user, &handle, sizeof(struct ipt_account_handle_sockopt)))
 817             {
 818                 printk("ACCOUNT: ipt_account_set_ctl: copy_to_user failed for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n");
 819                 break;
 820             }
 821             ret = 0;
 822             break;
 823         case IPT_SO_GET_ACCOUNT_GET_DATA:
 824             if (*len < sizeof(struct ipt_account_handle_sockopt))
 825             {
 826                 printk("ACCOUNT: ipt_account_get_ctl: wrong data size (%u != %u) for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n",
 827                        *len, sizeof(struct ipt_account_handle_sockopt));
 828                 break;
 829             }
 830
 831             if (copy_from_user (&handle, user, sizeof(struct ipt_account_handle_sockopt)))
 832             {
 833                 printk("ACCOUNT: ipt_account_get_ctl: copy_from_user failed for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n");
 834                 break;
 835             }
 836
 837             if (handle.handle_nr >= ACCOUNT_MAX_HANDLES)
 838             {
 839                 printk("ACCOUNT: Invalid handle for IPT_SO_GET_ACCOUNT_GET_DATA: %u\n", handle.handle_nr);
 840                 break;
 841             }
 842
 843             if (*len < ipt_account_handles[handle.handle_nr].itemcount*sizeof(struct ipt_account_handle_ip))
 844             {
 845                 printk("ACCOUNT: ipt_account_get_ctl: not enough space (%u < %u) to store data from IPT_SO_GET_ACCOUNT_GET_DATA\n",
 846                        *len, ipt_account_handles[handle.handle_nr].itemcount*sizeof(struct ipt_account_handle_ip));
 847                 break;
 848             }
 849
 850             spin_lock_bh(&ipt_account_lock);
 851             ret = ipt_account_handle_get_data(handle.handle_nr, user);
 852             spin_unlock_bh(&ipt_account_lock);
 853             if (ret)
 854             {
 855                 printk("ACCOUNT: ipt_account_get_ctl: ipt_account_handle_get_data failed for handle %u\n", handle.handle_nr);
 856                 break;
 857             }
 858
 859             ret = 0;
 860             break;
 861
 862         default:
 863             printk("ACCOUNT: ipt_account_get_ctl: unknown request %i\n", cmd);
 864     }
 865
 866     return ret;
 867 }
 868
 869 static struct ipt_target ipt_account_reg
 870 = { { NULL, NULL }, "ACCOUNT", ipt_account_target, ipt_account_checkentry, ipt_account_deleteentry,
 871     THIS_MODULE };
 872
 873 static struct nf_sockopt_ops ipt_account_sockopts
 874 = { { NULL, NULL }, PF_INET, IPT_SO_SET_ACCOUNT_HANDLE_FREE, IPT_SO_SET_ACCOUNT_MAX+1, ipt_account_set_ctl,
 875     IPT_SO_GET_ACCOUNT_PREPARE_READ, IPT_SO_GET_ACCOUNT_MAX+1, ipt_account_get_ctl, 0, NULL  };
 876
 877 static int __init init(void)
 878 {
 879     if (PAGE_SIZE < 4096)
 880     {
 881         printk("ACCOUNT: Sorry we need at least a PAGE_SIZE of 4096. Found: %lu\n", PAGE_SIZE);
 882         return -EINVAL;
 883     }
 884
 885     if (!(ipt_account_tables = kmalloc(ACCOUNT_MAX_TABLES*sizeof(struct ipt_account_table), GFP_KERNEL)))
 886     {
 887         printk("ACCOUNT: Out of memory allocating account_tables structure");
 888         return -EINVAL;
 889     }
 890     memset(ipt_account_tables, 0, ACCOUNT_MAX_TABLES*sizeof(struct ipt_account_table));
 891
 892     if (!(ipt_account_handles = kmalloc(ACCOUNT_MAX_HANDLES*sizeof(struct ipt_account_handle), GFP_KERNEL)))
 893     {
 894         printk("ACCOUNT: Out of memory allocating account_handles structure");
 895         kfree (ipt_account_tables);
 896         ipt_account_tables = NULL;
 897         return -EINVAL;
 898     }
 899     memset(ipt_account_handles, 0, ACCOUNT_MAX_HANDLES*sizeof(struct ipt_account_handle));
 900
 901     /* Register setsockopt */
 902     if (nf_register_sockopt(&ipt_account_sockopts) < 0)
 903     {
 904         printk("ACCOUNT: Can't register sockopts. Aborting\n");
 905
 906         kfree (ipt_account_tables);
 907         ipt_account_tables = NULL;
 908         kfree(ipt_account_handles);
 909         ipt_account_handles = NULL;
 910
 911         return -EINVAL;
 912     }
 913
 914     if (ipt_register_target(&ipt_account_reg))
 915             return -EINVAL;
 916
 917     return 0;
 918 }
 919
 920 static void __exit fini(void)
 921 {
 922     ipt_unregister_target(&ipt_account_reg);
 923
 924     nf_unregister_sockopt(&ipt_account_sockopts);
 925
 926     kfree(ipt_account_tables);
 927     ipt_account_tables = NULL;
 928
 929     kfree(ipt_account_handles);
 930     ipt_account_handles = NULL;
 931 }
 932
 933 module_init(init);
 934 module_exit(fini);
 935 MODULE_LICENSE("GPL");