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_src_new_ip = 0, is_dst_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_src_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_dst_new_ip = 1;
 288
 289         mask_24->ip[slot].dst_packets++;
 290         mask_24->ip[slot].dst_bytes+=size;
 291     }
 292
 293     // Increase itemcounter
 294     if (src_ip == dst_ip)
 295     {
 296         if (is_src_new_ip || is_dst_new_ip)
 297             (*itemcount)++;
 298     } else {
 299         if (is_src_new_ip)
 300             (*itemcount)++;
 301         if (is_dst_new_ip)
 302             (*itemcount)++;
 303     }
 304 }
 305
 306 void ipt_account_depth1_insert(struct ipt_account_mask_16 *mask_16, unsigned int net_ip, unsigned int netmask,
 307                                unsigned int src_ip, unsigned int dst_ip, unsigned int size, unsigned int *itemcount)
 308 {
 309     // Do we need to process src IP?
 310     if ((net_ip&netmask) == (src_ip&netmask))
 311     {
 312         unsigned char slot = (unsigned char)((src_ip&0x00FF0000) >> 16);
 313         DEBUGP("ACCOUNT: Calculated SRC 16 bit network slot: %d\n", slot);
 314
 315         // Do we need to create a new mask_24 bucket?
 316         if (!mask_16->mask_24[slot] && !(mask_16->mask_24[slot] = (void *)get_zeroed_page(GFP_KERNEL)))
 317         {
 318             printk("ACCOUNT: Can't process packet because out of memory!\n");
 319             return;
 320         }
 321
 322         ipt_account_depth0_insert((struct ipt_account_mask_24 *)mask_16->mask_24[slot], net_ip, netmask,
 323                                     src_ip, dst_ip, size, itemcount);
 324     }
 325
 326     // Do we need to process dst IP?
 327     if ((net_ip&netmask) == (dst_ip&netmask))
 328     {
 329         unsigned char slot = (unsigned char)((dst_ip&0x00FF0000) >> 16);
 330         DEBUGP("ACCOUNT: Calculated DST 16 bit network slot: %d\n", slot);
 331
 332         // Do we need to create a new mask_24 bucket?
 333         if (!mask_16->mask_24[slot] && !(mask_16->mask_24[slot] = (void *)get_zeroed_page(GFP_KERNEL)))
 334         {
 335             printk("ACCOUT: Can't process packet because out of memory!\n");
 336             return;
 337         }
 338
 339         ipt_account_depth0_insert((struct ipt_account_mask_24 *)mask_16->mask_24[slot], net_ip, netmask,
 340                                     src_ip, dst_ip, size, itemcount);
 341     }
 342 }
 343
 344 void ipt_account_depth2_insert(struct ipt_account_mask_8 *mask_8, unsigned int net_ip, unsigned int netmask,
 345                                unsigned int src_ip, unsigned int dst_ip, unsigned int size, unsigned int *itemcount)
 346 {
 347     // Do we need to process src IP?
 348     if ((net_ip&netmask) == (src_ip&netmask))
 349     {
 350         unsigned char slot = (unsigned char)((src_ip&0x0000FF00) >> 8);
 351         DEBUGP("ACCOUNT: Calculated SRC 24 bit network slot: %d\n", slot);
 352
 353         // Do we need to create a new mask_24 bucket?
 354         if (!mask_8->mask_16[slot] && !(mask_8->mask_16[slot] = (void *)get_zeroed_page(GFP_KERNEL)))
 355         {
 356             printk("ACCOUNT: Can't process packet because out of memory!\n");
 357             return;
 358         }
 359
 360         ipt_account_depth1_insert((struct ipt_account_mask_16 *)mask_8->mask_16[slot], net_ip, netmask,
 361                                     src_ip, dst_ip, size, itemcount);
 362     }
 363
 364     // Do we need to process dst IP?
 365     if ((net_ip&netmask) == (dst_ip&netmask))
 366     {
 367         unsigned char slot = (unsigned char)((dst_ip&0x0000FF00) >> 8);
 368         DEBUGP("ACCOUNT: Calculated DST 24 bit network slot: %d\n", slot);
 369
 370         // Do we need to create a new mask_24 bucket?
 371         if (!mask_8->mask_16[slot] && !(mask_8->mask_16[slot] = (void *)get_zeroed_page(GFP_KERNEL)))
 372         {
 373             printk("ACCOUNT: Can't process packet because out of memory!\n");
 374             return;
 375         }
 376
 377         ipt_account_depth1_insert((struct ipt_account_mask_16 *)mask_8->mask_16[slot], net_ip, netmask,
 378                                     src_ip, dst_ip, size, itemcount);
 379     }
 380 }
 381
 382 static unsigned int ipt_account_target(struct sk_buff **pskb,
 383     unsigned int hooknum,
 384     const struct net_device *in,
 385     const struct net_device *out,
 386     const void *targinfo,
 387     void *userinfo)
 388 {
 389     const struct ipt_account_info *info = (const struct ipt_account_info *)targinfo;
 390     unsigned int src_ip = (*pskb)->nh.iph->saddr;
 391     unsigned int dst_ip = (*pskb)->nh.iph->daddr;
 392     unsigned int size = ntohs((*pskb)->nh.iph->tot_len);
 393
 394     spin_lock_bh(&ipt_account_lock);
 395
 396     if (ipt_account_tables[info->table_nr].name[0] == 0)
 397     {
 398         printk("ACCOUNT: ipt_account_target: Invalid table id %u. IPs %u.%u.%u.%u/%u.%u.%u.%u\n",
 399                info->table_nr, NIPQUAD(src_ip), NIPQUAD(dst_ip));
 400         spin_unlock_bh(&ipt_account_lock);
 401         return IPT_CONTINUE;
 402     }
 403
 404     // 8 bit network or "any" network
 405     if (ipt_account_tables[info->table_nr].depth == 0)
 406     {
 407         // Count packet and check if the IP is new
 408         ipt_account_depth0_insert((struct ipt_account_mask_24 *)ipt_account_tables[info->table_nr].data,
 409                                   ipt_account_tables[info->table_nr].ip, ipt_account_tables[info->table_nr].netmask,
 410                                   src_ip, dst_ip, size, &ipt_account_tables[info->table_nr].itemcount);
 411         spin_unlock_bh(&ipt_account_lock);
 412         return IPT_CONTINUE;
 413     }
 414
 415     // 16 bit network
 416     if (ipt_account_tables[info->table_nr].depth == 1)
 417     {
 418         ipt_account_depth1_insert((struct ipt_account_mask_16 *)ipt_account_tables[info->table_nr].data,
 419                                   ipt_account_tables[info->table_nr].ip, ipt_account_tables[info->table_nr].netmask,
 420                                   src_ip, dst_ip, size, &ipt_account_tables[info->table_nr].itemcount);
 421         spin_unlock_bh(&ipt_account_lock);
 422         return IPT_CONTINUE;
 423     }
 424
 425     // 24 bit network
 426     if (ipt_account_tables[info->table_nr].depth == 2)
 427     {
 428         ipt_account_depth2_insert((struct ipt_account_mask_8 *)ipt_account_tables[info->table_nr].data,
 429                                   ipt_account_tables[info->table_nr].ip, ipt_account_tables[info->table_nr].netmask,
 430                                   src_ip, dst_ip, size, &ipt_account_tables[info->table_nr].itemcount);
 431         spin_unlock_bh(&ipt_account_lock);
 432         return IPT_CONTINUE;
 433     }
 434
 435     printk("ACCOUNT: ipt_account_target: Unable to process packet. Table id %u. IPs %u.%u.%u.%u/%u.%u.%u.%u\n",
 436             info->table_nr, NIPQUAD(src_ip), NIPQUAD(dst_ip));
 437
 438     spin_unlock_bh(&ipt_account_lock);
 439     return IPT_CONTINUE;
 440 }
 441
 442 /*
 443     Functions dealing with "handles":
 444     Handles are snapshots of a accounting state.
 445
 446     read snapshots are only for debugging the code
 447     and are very expensive concerning speed/memory
 448     compared to read_and_flush.
 449
 450     The functions aren't protected by spinlocks themselves
 451     as this is done in the ioctl part of the code.
 452 */
 453
 454 /*
 455     Find a free handle slot. Normally only one should be used,
 456     but there could be two or more applications accessing the data
 457     at the same time.
 458 */
 459 int ipt_account_handle_find_slot(void)
 460 {
 461     unsigned int i;
 462     // Insert new table
 463     for (i = 0; i < ACCOUNT_MAX_HANDLES; i++)
 464     {
 465         // Found free slot
 466         if (ipt_account_handles[i].data == NULL)
 467         {
 468             // Don't "mark" data as used as we are protected by a spinlock by the calling function.
 469             // handle_find_slot() is only a function to prevent code duplication.
 470             return i;
 471         }
 472     }
 473
 474     // No free slot found
 475     printk("ACCOUNT: No free handle slot found (max: %u). Please increase ACCOUNT_MAX_HANDLES.\n", ACCOUNT_MAX_HANDLES);
 476     return -1;
 477 }
 478
 479 int ipt_account_handle_free(unsigned int handle)
 480 {
 481     if (handle >= ACCOUNT_MAX_HANDLES)
 482     {
 483         printk("ACCOUNT: Invalid handle for ipt_account_handle_free() specified: %u\n", handle);
 484         return -EINVAL;
 485     }
 486
 487     ipt_account_data_free(ipt_account_handles[handle].data, ipt_account_handles[handle].depth);
 488     memset (&ipt_account_handles[handle], 0, sizeof (struct ipt_account_handle));
 489     return 0;
 490 }
 491
 492 /* Prepare data for read without flush. Use only for debugging!
 493    Real applications should use read&flush as it's way more efficent */
 494 int ipt_account_handle_prepare_read(char *tablename, unsigned int *count)
 495 {
 496     int handle, i, table_nr=-1;
 497
 498     for (i = 0; i < ACCOUNT_MAX_TABLES; i++)
 499         if (strncmp(ipt_account_tables[i].name, tablename, ACCOUNT_TABLE_NAME_LEN) == 0)
 500         {
 501             table_nr = i;
 502             break;
 503         }
 504
 505     if (table_nr == -1)
 506     {
 507         printk("ACCOUNT: ipt_account_handle_prepare_read(): Table %s not found\n", tablename);
 508         return -1;
 509     }
 510
 511     // Can't find a free handle slot?
 512     if ((handle = ipt_account_handle_find_slot()) == -1)
 513         return -1;
 514
 515     // Fill up handle structure
 516     ipt_account_handles[handle].ip = ipt_account_tables[table_nr].ip;
 517     ipt_account_handles[handle].depth = ipt_account_tables[table_nr].depth;
 518     ipt_account_handles[handle].itemcount = ipt_account_tables[table_nr].itemcount;
 519
 520     // allocate "root" table
 521     if (!(ipt_account_handles[handle].data = (void*)get_zeroed_page(GFP_KERNEL)))
 522     {
 523         printk("ACCOUNT: out of memory for root table in ipt_account_handle_prepare_read()\n");
 524         memset (&ipt_account_handles[handle], 0, sizeof(struct ipt_account_handle));
 525         return -1;
 526     }
 527
 528     // Recursive copy of complete data structure
 529     unsigned int depth = ipt_account_handles[handle].depth;
 530     if (depth == 0)
 531     {
 532         memcpy(ipt_account_handles[handle].data, ipt_account_tables[table_nr].data, sizeof(struct ipt_account_mask_24));
 533     } else if (depth == 1) {
 534         struct ipt_account_mask_16 *src_16 = (struct ipt_account_mask_16 *)ipt_account_tables[table_nr].data;
 535         struct ipt_account_mask_16 *network_16 = (struct ipt_account_mask_16 *)ipt_account_handles[handle].data;
 536         unsigned char b;
 537
 538         for (b = 0; b < 255; b++)
 539         {
 540             if (src_16->mask_24[b])
 541             {
 542                 if (!(network_16->mask_24[b] = (void*)get_zeroed_page(GFP_KERNEL)))
 543                 {
 544                     printk("ACCOUNT: out of memory during copy of 16 bit network in ipt_account_handle_prepare_read()\n");
 545                     ipt_account_data_free(ipt_account_handles[handle].data, depth);
 546                     memset (&ipt_account_handles[handle], 0, sizeof(struct ipt_account_handle));
 547                     return -1;
 548                 }
 549
 550                 memcpy(network_16->mask_24[b], src_16->mask_24[b], sizeof(struct ipt_account_mask_24));
 551             }
 552         }
 553     } else if(depth == 2) {
 554         struct ipt_account_mask_8 *src_8 = (struct ipt_account_mask_8 *)ipt_account_tables[table_nr].data;
 555         struct ipt_account_mask_8 *network_8 = (struct ipt_account_mask_8 *)ipt_account_handles[handle].data;
 556         unsigned char a;
 557
 558         for (a = 0; a < 255; a++)
 559         {
 560             if (src_8->mask_16[a])
 561             {
 562                 if (!(network_8->mask_16[a] = (void*)get_zeroed_page(GFP_KERNEL)))
 563                 {
 564                     printk("ACCOUNT: out of memory during copy of 24 bit network in ipt_account_handle_prepare_read()\n");
 565                     ipt_account_data_free(ipt_account_handles[handle].data, depth);
 566                     memset (&ipt_account_handles[handle], 0, sizeof(struct ipt_account_handle));
 567                     return -1;
 568                 }
 569
 570                 memcpy(network_8->mask_16[a], src_8->mask_16[a], sizeof(struct ipt_account_mask_16));
 571
 572                 struct ipt_account_mask_16 *src_16 = src_8->mask_16[a];
 573                 struct ipt_account_mask_16 *network_16 = network_8->mask_16[a];
 574                 unsigned char b;
 575
 576                 for (b = 0; b < 255; b++)
 577                 {
 578                     if (src_16->mask_24[b])
 579                     {
 580                         if (!(network_16->mask_24[b] = (void*)get_zeroed_page(GFP_KERNEL)))
 581                         {
 582                             printk("ACCOUNT: out of memory during copy of 16 bit network in ipt_account_handle_prepare_read()\n");
 583                             ipt_account_data_free(ipt_account_handles[handle].data, depth);
 584                             memset (&ipt_account_handles[handle], 0, sizeof(struct ipt_account_handle));
 585                             return -1;
 586                         }
 587
 588                         memcpy(network_16->mask_24[b], src_16->mask_24[b], sizeof(struct ipt_account_mask_24));
 589                     }
 590                 }
 591             }
 592         }
 593     }
 594
 595     *count = ipt_account_tables[table_nr].itemcount;
 596     return handle;
 597 }
 598
 599 /* Prepare data for read and flush it */
 600 int ipt_account_handle_prepare_read_flush(char *tablename, unsigned int *count)
 601 {
 602     int handle, i, table_nr=-1;
 603
 604     for (i = 0; i < ACCOUNT_MAX_TABLES; i++)
 605         if (strncmp(ipt_account_tables[i].name, tablename, ACCOUNT_TABLE_NAME_LEN) == 0)
 606         {
 607             table_nr = i;
 608             break;
 609         }
 610
 611     if (table_nr == -1)
 612     {
 613         printk("ACCOUNT: ipt_account_handle_prepare_read_flush(): Table %s not found\n", tablename);
 614         return -1;
 615     }
 616
 617     // Can't find a free handle slot?
 618     if ((handle = ipt_account_handle_find_slot()) == -1)
 619         return -1;
 620
 621     // Fill up handle structure
 622     ipt_account_handles[handle].ip = ipt_account_tables[table_nr].ip;
 623     ipt_account_handles[handle].depth = ipt_account_tables[table_nr].depth;
 624     ipt_account_handles[handle].itemcount = ipt_account_tables[table_nr].itemcount;
 625     ipt_account_handles[handle].data = ipt_account_tables[table_nr].data;
 626     *count = ipt_account_tables[table_nr].itemcount;
 627
 628     // "Flush" table data
 629     ipt_account_tables[table_nr].data = (void*)get_zeroed_page(GFP_KERNEL);
 630     ipt_account_tables[table_nr].itemcount = 0;
 631
 632     return handle;
 633 }
 634
 635 /* Copy the actual that into a prepared buffer.
 636    We only copy entries != 0 to increase performance.
 637    The memory gets freed again in ipt_account_handle_free().
 638 */
 639 int ipt_account_handle_get_data(unsigned int handle, void *buffer)
 640 {
 641     struct ipt_account_handle_ip handle_ip;
 642     unsigned int handle_ip_size = sizeof (struct ipt_account_handle_ip);
 643     unsigned char i;
 644
 645     if (handle >= ACCOUNT_MAX_HANDLES)
 646     {
 647         printk("ACCOUNT: invalid handle for ipt_account_handle_get_data() specified: %u\n", handle);
 648         return -1;
 649     }
 650
 651     if (ipt_account_handles[handle].data == NULL)
 652     {
 653         printk("ACCOUNT: handle %u is BROKEN: Contains no data\n", handle);
 654         return -1;
 655     }
 656
 657     // Check if at least packet src/dst matches ip/netmask
 658     unsigned int net_ip = ipt_account_handles[handle].ip;
 659     unsigned int depth = ipt_account_handles[handle].depth;
 660
 661     // 8 bit network
 662     if (depth == 0)
 663     {
 664         struct ipt_account_mask_24 *network = (struct ipt_account_mask_24*)ipt_account_handles[handle].data;
 665         for (i = 0; i < 255; i++)
 666         {
 667             if (network->ip[i].src_packets || network->ip[i].dst_packets)
 668             {
 669                 handle_ip.ip = net_ip | (i<<24);
 670                 handle_ip.src_packets = network->ip[i].src_packets;
 671                 handle_ip.src_bytes = network->ip[i].src_bytes;
 672                 handle_ip.dst_packets = network->ip[i].dst_packets;
 673                 handle_ip.dst_bytes = network->ip[i].dst_bytes;
 674
 675                 copy_to_user(buffer, &handle_ip, handle_ip_size);
 676                 buffer += handle_ip_size;
 677             }
 678         }
 679
 680         return 0;
 681     }
 682
 683     // 16 bit network
 684     if (depth == 1)
 685     {
 686         struct ipt_account_mask_16 *network_16 = (struct ipt_account_mask_16*)ipt_account_handles[handle].data;
 687         unsigned char b;
 688         for (b = 0; b < 255; b++)
 689         {
 690             if (network_16->mask_24[b])
 691             {
 692                 struct ipt_account_mask_24 *network = (struct ipt_account_mask_24*)network_16->mask_24[b];
 693                 for (i = 0; i < 255; i++)
 694                 {
 695                     if (network->ip[i].src_packets || network->ip[i].dst_packets)
 696                     {
 697                         handle_ip.ip = net_ip | (b << 16) | (i<<24);
 698                         handle_ip.src_packets = network->ip[i].src_packets;
 699                         handle_ip.src_bytes = network->ip[i].src_bytes;
 700                         handle_ip.dst_packets = network->ip[i].dst_packets;
 701                         handle_ip.dst_bytes = network->ip[i].dst_bytes;
 702
 703                         copy_to_user(buffer, &handle_ip, handle_ip_size);
 704                         buffer += handle_ip_size;
 705                     }
 706                 }
 707             }
 708         }
 709
 710         return 0;
 711     }
 712
 713     // 24 bit network
 714     if (depth == 2)
 715     {
 716         struct ipt_account_mask_8 *network_8 = (struct ipt_account_mask_8*)ipt_account_handles[handle].data;
 717         unsigned char a, b;
 718         for (a = 0; a < 255; a++)
 719         {
 720             if (network_8->mask_16[a])
 721             {
 722                 struct ipt_account_mask_16 *network_16 = (struct ipt_account_mask_16*)network_8->mask_16[a];
 723                 for (b = 0; b < 255; b++)
 724                 {
 725                     if (network_16->mask_24[b])
 726                     {
 727                         struct ipt_account_mask_24 *network = (struct ipt_account_mask_24*)network_16->mask_24[b];
 728                         for (i = 0; i < 255; i++)
 729                         {
 730                             if (network->ip[i].src_packets || network->ip[i].dst_packets)
 731                             {
 732                                 handle_ip.ip = net_ip | (a << 8) | (b << 16) | (i<<24);
 733                                 handle_ip.src_packets = network->ip[i].src_packets;
 734                                 handle_ip.src_bytes = network->ip[i].src_bytes;
 735                                 handle_ip.dst_packets = network->ip[i].dst_packets;
 736                                 handle_ip.dst_bytes = network->ip[i].dst_bytes;
 737
 738                                 copy_to_user(buffer, &handle_ip, handle_ip_size);
 739                                 buffer += handle_ip_size;
 740                             }
 741                         }
 742                     }
 743                 }
 744             }
 745         }
 746
 747         return 0;
 748     }
 749
 750     return -1;
 751 }
 752
 753 static int ipt_account_set_ctl(struct sock *sk, int cmd, void *user, unsigned int len)
 754 {
 755     struct ipt_account_handle_sockopt handle;
 756     int ret = -EINVAL;
 757
 758     if (!capable(CAP_NET_ADMIN))
 759             return -EPERM;
 760
 761     switch (cmd)
 762     {
 763         case IPT_SO_SET_ACCOUNT_HANDLE_FREE:
 764             if (len != sizeof(struct ipt_account_handle_sockopt))
 765             {
 766                 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));
 767                 break;
 768             }
 769
 770             if (copy_from_user (&handle, user, len))
 771             {
 772                 printk("ACCOUNT: ipt_account_set_ctl: copy_from_user failed for IPT_SO_SET_HANDLE_FREE\n");
 773                 break;
 774             }
 775
 776             spin_lock_bh(&ipt_account_lock);
 777             ret = ipt_account_handle_free(handle.handle_nr);
 778             spin_unlock_bh(&ipt_account_lock);
 779             break;
 780         default:
 781             printk("ACCOUNT: ipt_account_set_ctl: unknown request %i\n", cmd);
 782     }
 783
 784     return ret;
 785 }
 786
 787 static int ipt_account_get_ctl(struct sock *sk, int cmd, void *user, int *len)
 788 {
 789     struct ipt_account_handle_sockopt handle;
 790     int ret = -EINVAL;
 791
 792     if (!capable(CAP_NET_ADMIN))
 793             return -EPERM;
 794
 795     switch (cmd)
 796     {
 797         case IPT_SO_GET_ACCOUNT_PREPARE_READ_FLUSH:
 798         case IPT_SO_GET_ACCOUNT_PREPARE_READ:
 799             if (*len < sizeof(struct ipt_account_handle_sockopt))
 800             {
 801                 printk("ACCOUNT: ipt_account_get_ctl: wrong data size (%u != %u) for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n",
 802                        *len, sizeof(struct ipt_account_handle_sockopt));
 803                 break;
 804             }
 805
 806             if (copy_from_user (&handle, user, sizeof(struct ipt_account_handle_sockopt)))
 807             {
 808                 printk("ACCOUNT: ipt_account_get_ctl: copy_from_user failed for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n");
 809                 break;
 810             }
 811
 812             spin_lock_bh(&ipt_account_lock);
 813             if (cmd == IPT_SO_GET_ACCOUNT_PREPARE_READ_FLUSH)
 814                 handle.handle_nr = ipt_account_handle_prepare_read_flush(handle.name, &handle.itemcount);
 815             else
 816                 handle.handle_nr = ipt_account_handle_prepare_read(handle.name, &handle.itemcount);
 817             spin_unlock_bh(&ipt_account_lock);
 818
 819             if (handle.handle_nr == -1)
 820             {
 821                 printk("ACCOUNT: ipt_account_get_ctl: ipt_account_handle_prepare_read failed\n");
 822                 break;
 823             }
 824
 825             if (copy_to_user(user, &handle, sizeof(struct ipt_account_handle_sockopt)))
 826             {
 827                 printk("ACCOUNT: ipt_account_set_ctl: copy_to_user failed for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n");
 828                 break;
 829             }
 830             ret = 0;
 831             break;
 832         case IPT_SO_GET_ACCOUNT_GET_DATA:
 833             if (*len < sizeof(struct ipt_account_handle_sockopt))
 834             {
 835                 printk("ACCOUNT: ipt_account_get_ctl: wrong data size (%u != %u) for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n",
 836                        *len, sizeof(struct ipt_account_handle_sockopt));
 837                 break;
 838             }
 839
 840             if (copy_from_user (&handle, user, sizeof(struct ipt_account_handle_sockopt)))
 841             {
 842                 printk("ACCOUNT: ipt_account_get_ctl: copy_from_user failed for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n");
 843                 break;
 844             }
 845
 846             if (handle.handle_nr >= ACCOUNT_MAX_HANDLES)
 847             {
 848                 printk("ACCOUNT: Invalid handle for IPT_SO_GET_ACCOUNT_GET_DATA: %u\n", handle.handle_nr);
 849                 break;
 850             }
 851
 852             if (*len < ipt_account_handles[handle.handle_nr].itemcount*sizeof(struct ipt_account_handle_ip))
 853             {
 854                 printk("ACCOUNT: ipt_account_get_ctl: not enough space (%u < %u) to store data from IPT_SO_GET_ACCOUNT_GET_DATA\n",
 855                        *len, ipt_account_handles[handle.handle_nr].itemcount*sizeof(struct ipt_account_handle_ip));
 856                 break;
 857             }
 858
 859             spin_lock_bh(&ipt_account_lock);
 860             ret = ipt_account_handle_get_data(handle.handle_nr, user);
 861             spin_unlock_bh(&ipt_account_lock);
 862             if (ret)
 863             {
 864                 printk("ACCOUNT: ipt_account_get_ctl: ipt_account_handle_get_data failed for handle %u\n", handle.handle_nr);
 865                 break;
 866             }
 867
 868             ret = 0;
 869             break;
 870
 871         default:
 872             printk("ACCOUNT: ipt_account_get_ctl: unknown request %i\n", cmd);
 873     }
 874
 875     return ret;
 876 }
 877
 878 static struct ipt_target ipt_account_reg
 879 = { { NULL, NULL }, "ACCOUNT", ipt_account_target, ipt_account_checkentry, ipt_account_deleteentry,
 880     THIS_MODULE };
 881
 882 static struct nf_sockopt_ops ipt_account_sockopts
 883 = { { NULL, NULL }, PF_INET, IPT_SO_SET_ACCOUNT_HANDLE_FREE, IPT_SO_SET_ACCOUNT_MAX+1, ipt_account_set_ctl,
 884     IPT_SO_GET_ACCOUNT_PREPARE_READ, IPT_SO_GET_ACCOUNT_MAX+1, ipt_account_get_ctl, 0, NULL  };
 885
 886 static int __init init(void)
 887 {
 888     if (PAGE_SIZE < 4096)
 889     {
 890         printk("ACCOUNT: Sorry we need at least a PAGE_SIZE of 4096. Found: %lu\n", PAGE_SIZE);
 891         return -EINVAL;
 892     }
 893
 894     if (!(ipt_account_tables = kmalloc(ACCOUNT_MAX_TABLES*sizeof(struct ipt_account_table), GFP_KERNEL)))
 895     {
 896         printk("ACCOUNT: Out of memory allocating account_tables structure");
 897         return -EINVAL;
 898     }
 899     memset(ipt_account_tables, 0, ACCOUNT_MAX_TABLES*sizeof(struct ipt_account_table));
 900
 901     if (!(ipt_account_handles = kmalloc(ACCOUNT_MAX_HANDLES*sizeof(struct ipt_account_handle), GFP_KERNEL)))
 902     {
 903         printk("ACCOUNT: Out of memory allocating account_handles structure");
 904         kfree (ipt_account_tables);
 905         ipt_account_tables = NULL;
 906         return -EINVAL;
 907     }
 908     memset(ipt_account_handles, 0, ACCOUNT_MAX_HANDLES*sizeof(struct ipt_account_handle));
 909
 910     /* Register setsockopt */
 911     if (nf_register_sockopt(&ipt_account_sockopts) < 0)
 912     {
 913         printk("ACCOUNT: Can't register sockopts. Aborting\n");
 914
 915         kfree (ipt_account_tables);
 916         ipt_account_tables = NULL;
 917         kfree(ipt_account_handles);
 918         ipt_account_handles = NULL;
 919
 920         return -EINVAL;
 921     }
 922
 923     if (ipt_register_target(&ipt_account_reg))
 924             return -EINVAL;
 925
 926     return 0;
 927 }
 928
 929 static void __exit fini(void)
 930 {
 931     ipt_unregister_target(&ipt_account_reg);
 932
 933     nf_unregister_sockopt(&ipt_account_sockopts);
 934
 935     kfree(ipt_account_tables);
 936     ipt_account_tables = NULL;
 937
 938     kfree(ipt_account_handles);
 939     ipt_account_handles = NULL;
 940 }
 941
 942 module_init(init);
 943 module_exit(fini);
 944 MODULE_LICENSE("GPL");