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     // Calculate array positions
 271     unsigned char src_slot = (unsigned char)((src_ip&0xFF000000) >> 24);
 272     unsigned char dst_slot = (unsigned char)((dst_ip&0xFF000000) >> 24);
 273
 274     // Increase size counters
 275     if (is_src)
 276     {
 277         // Calculate network slot
 278         DEBUGP("ACCOUNT: Calculated SRC 8 bit network slot: %d\n", slot);
 279         if (!mask_24->ip[src_slot].src_packets && !mask_24->ip[src_slot].dst_packets)
 280             is_src_new_ip = 1;
 281
 282         mask_24->ip[src_slot].src_packets++;
 283         mask_24->ip[src_slot].src_bytes+=size;
 284     }
 285     if (is_dst)
 286     {
 287         DEBUGP("ACCOUNT: Calculated DST 8 bit network slot: %d\n", slot);
 288         if (!mask_24->ip[dst_slot].src_packets && !mask_24->ip[dst_slot].dst_packets)
 289             is_dst_new_ip = 1;
 290
 291         mask_24->ip[dst_slot].dst_packets++;
 292         mask_24->ip[dst_slot].dst_bytes+=size;
 293     }
 294
 295     // Increase itemcounter
 296     if (src_slot == dst_slot)
 297     {
 298         if (is_src_new_ip || is_dst_new_ip)
 299             (*itemcount)++;
 300     } else {
 301         if (is_src_new_ip)
 302             (*itemcount)++;
 303         if (is_dst_new_ip)
 304             (*itemcount)++;
 305     }
 306 }
 307
 308 void ipt_account_depth1_insert(struct ipt_account_mask_16 *mask_16, unsigned int net_ip, unsigned int netmask,
 309                                unsigned int src_ip, unsigned int dst_ip, unsigned int size, unsigned int *itemcount)
 310 {
 311     // Do we need to process src IP?
 312     if ((net_ip&netmask) == (src_ip&netmask))
 313     {
 314         unsigned char slot = (unsigned char)((src_ip&0x00FF0000) >> 16);
 315         DEBUGP("ACCOUNT: Calculated SRC 16 bit network slot: %d\n", slot);
 316
 317         // Do we need to create a new mask_24 bucket?
 318         if (!mask_16->mask_24[slot] && !(mask_16->mask_24[slot] = (void *)get_zeroed_page(GFP_KERNEL)))
 319         {
 320             printk("ACCOUNT: Can't process packet because out of memory!\n");
 321             return;
 322         }
 323
 324         ipt_account_depth0_insert((struct ipt_account_mask_24 *)mask_16->mask_24[slot], net_ip, netmask,
 325                                     src_ip, dst_ip, size, itemcount);
 326     }
 327
 328     // Do we need to process dst IP?
 329     if ((net_ip&netmask) == (dst_ip&netmask))
 330     {
 331         unsigned char slot = (unsigned char)((dst_ip&0x00FF0000) >> 16);
 332         DEBUGP("ACCOUNT: Calculated DST 16 bit network slot: %d\n", slot);
 333
 334         // Do we need to create a new mask_24 bucket?
 335         if (!mask_16->mask_24[slot] && !(mask_16->mask_24[slot] = (void *)get_zeroed_page(GFP_KERNEL)))
 336         {
 337             printk("ACCOUT: Can't process packet because out of memory!\n");
 338             return;
 339         }
 340
 341         ipt_account_depth0_insert((struct ipt_account_mask_24 *)mask_16->mask_24[slot], net_ip, netmask,
 342                                     src_ip, dst_ip, size, itemcount);
 343     }
 344 }
 345
 346 void ipt_account_depth2_insert(struct ipt_account_mask_8 *mask_8, unsigned int net_ip, unsigned int netmask,
 347                                unsigned int src_ip, unsigned int dst_ip, unsigned int size, unsigned int *itemcount)
 348 {
 349     // Do we need to process src IP?
 350     if ((net_ip&netmask) == (src_ip&netmask))
 351     {
 352         unsigned char slot = (unsigned char)((src_ip&0x0000FF00) >> 8);
 353         DEBUGP("ACCOUNT: Calculated SRC 24 bit network slot: %d\n", slot);
 354
 355         // Do we need to create a new mask_24 bucket?
 356         if (!mask_8->mask_16[slot] && !(mask_8->mask_16[slot] = (void *)get_zeroed_page(GFP_KERNEL)))
 357         {
 358             printk("ACCOUNT: Can't process packet because out of memory!\n");
 359             return;
 360         }
 361
 362         ipt_account_depth1_insert((struct ipt_account_mask_16 *)mask_8->mask_16[slot], net_ip, netmask,
 363                                     src_ip, dst_ip, size, itemcount);
 364     }
 365
 366     // Do we need to process dst IP?
 367     if ((net_ip&netmask) == (dst_ip&netmask))
 368     {
 369         unsigned char slot = (unsigned char)((dst_ip&0x0000FF00) >> 8);
 370         DEBUGP("ACCOUNT: Calculated DST 24 bit network slot: %d\n", slot);
 371
 372         // Do we need to create a new mask_24 bucket?
 373         if (!mask_8->mask_16[slot] && !(mask_8->mask_16[slot] = (void *)get_zeroed_page(GFP_KERNEL)))
 374         {
 375             printk("ACCOUNT: Can't process packet because out of memory!\n");
 376             return;
 377         }
 378
 379         ipt_account_depth1_insert((struct ipt_account_mask_16 *)mask_8->mask_16[slot], net_ip, netmask,
 380                                     src_ip, dst_ip, size, itemcount);
 381     }
 382 }
 383
 384 static unsigned int ipt_account_target(struct sk_buff **pskb,
 385     unsigned int hooknum,
 386     const struct net_device *in,
 387     const struct net_device *out,
 388     const void *targinfo,
 389     void *userinfo)
 390 {
 391     const struct ipt_account_info *info = (const struct ipt_account_info *)targinfo;
 392     unsigned int src_ip = (*pskb)->nh.iph->saddr;
 393     unsigned int dst_ip = (*pskb)->nh.iph->daddr;
 394     unsigned int size = ntohs((*pskb)->nh.iph->tot_len);
 395
 396     spin_lock_bh(&ipt_account_lock);
 397
 398     if (ipt_account_tables[info->table_nr].name[0] == 0)
 399     {
 400         printk("ACCOUNT: ipt_account_target: Invalid table id %u. IPs %u.%u.%u.%u/%u.%u.%u.%u\n",
 401                info->table_nr, NIPQUAD(src_ip), NIPQUAD(dst_ip));
 402         spin_unlock_bh(&ipt_account_lock);
 403         return IPT_CONTINUE;
 404     }
 405
 406     // 8 bit network or "any" network
 407     if (ipt_account_tables[info->table_nr].depth == 0)
 408     {
 409         // Count packet and check if the IP is new
 410         ipt_account_depth0_insert((struct ipt_account_mask_24 *)ipt_account_tables[info->table_nr].data,
 411                                   ipt_account_tables[info->table_nr].ip, ipt_account_tables[info->table_nr].netmask,
 412                                   src_ip, dst_ip, size, &ipt_account_tables[info->table_nr].itemcount);
 413         spin_unlock_bh(&ipt_account_lock);
 414         return IPT_CONTINUE;
 415     }
 416
 417     // 16 bit network
 418     if (ipt_account_tables[info->table_nr].depth == 1)
 419     {
 420         ipt_account_depth1_insert((struct ipt_account_mask_16 *)ipt_account_tables[info->table_nr].data,
 421                                   ipt_account_tables[info->table_nr].ip, ipt_account_tables[info->table_nr].netmask,
 422                                   src_ip, dst_ip, size, &ipt_account_tables[info->table_nr].itemcount);
 423         spin_unlock_bh(&ipt_account_lock);
 424         return IPT_CONTINUE;
 425     }
 426
 427     // 24 bit network
 428     if (ipt_account_tables[info->table_nr].depth == 2)
 429     {
 430         ipt_account_depth2_insert((struct ipt_account_mask_8 *)ipt_account_tables[info->table_nr].data,
 431                                   ipt_account_tables[info->table_nr].ip, ipt_account_tables[info->table_nr].netmask,
 432                                   src_ip, dst_ip, size, &ipt_account_tables[info->table_nr].itemcount);
 433         spin_unlock_bh(&ipt_account_lock);
 434         return IPT_CONTINUE;
 435     }
 436
 437     printk("ACCOUNT: ipt_account_target: Unable to process packet. Table id %u. IPs %u.%u.%u.%u/%u.%u.%u.%u\n",
 438             info->table_nr, NIPQUAD(src_ip), NIPQUAD(dst_ip));
 439
 440     spin_unlock_bh(&ipt_account_lock);
 441     return IPT_CONTINUE;
 442 }
 443
 444 /*
 445     Functions dealing with "handles":
 446     Handles are snapshots of a accounting state.
 447
 448     read snapshots are only for debugging the code
 449     and are very expensive concerning speed/memory
 450     compared to read_and_flush.
 451
 452     The functions aren't protected by spinlocks themselves
 453     as this is done in the ioctl part of the code.
 454 */
 455
 456 /*
 457     Find a free handle slot. Normally only one should be used,
 458     but there could be two or more applications accessing the data
 459     at the same time.
 460 */
 461 int ipt_account_handle_find_slot(void)
 462 {
 463     unsigned int i;
 464     // Insert new table
 465     for (i = 0; i < ACCOUNT_MAX_HANDLES; i++)
 466     {
 467         // Found free slot
 468         if (ipt_account_handles[i].data == NULL)
 469         {
 470             // Don't "mark" data as used as we are protected by a spinlock by the calling function.
 471             // handle_find_slot() is only a function to prevent code duplication.
 472             return i;
 473         }
 474     }
 475
 476     // No free slot found
 477     printk("ACCOUNT: No free handle slot found (max: %u). Please increase ACCOUNT_MAX_HANDLES.\n", ACCOUNT_MAX_HANDLES);
 478     return -1;
 479 }
 480
 481 int ipt_account_handle_free(unsigned int handle)
 482 {
 483     if (handle >= ACCOUNT_MAX_HANDLES)
 484     {
 485         printk("ACCOUNT: Invalid handle for ipt_account_handle_free() specified: %u\n", handle);
 486         return -EINVAL;
 487     }
 488
 489     ipt_account_data_free(ipt_account_handles[handle].data, ipt_account_handles[handle].depth);
 490     memset (&ipt_account_handles[handle], 0, sizeof (struct ipt_account_handle));
 491     return 0;
 492 }
 493
 494 /* Prepare data for read without flush. Use only for debugging!
 495    Real applications should use read&flush as it's way more efficent */
 496 int ipt_account_handle_prepare_read(char *tablename, unsigned int *count)
 497 {
 498     int handle, i, table_nr=-1;
 499
 500     for (i = 0; i < ACCOUNT_MAX_TABLES; i++)
 501         if (strncmp(ipt_account_tables[i].name, tablename, ACCOUNT_TABLE_NAME_LEN) == 0)
 502         {
 503             table_nr = i;
 504             break;
 505         }
 506
 507     if (table_nr == -1)
 508     {
 509         printk("ACCOUNT: ipt_account_handle_prepare_read(): Table %s not found\n", tablename);
 510         return -1;
 511     }
 512
 513     // Can't find a free handle slot?
 514     if ((handle = ipt_account_handle_find_slot()) == -1)
 515         return -1;
 516
 517     // Fill up handle structure
 518     ipt_account_handles[handle].ip = ipt_account_tables[table_nr].ip;
 519     ipt_account_handles[handle].depth = ipt_account_tables[table_nr].depth;
 520     ipt_account_handles[handle].itemcount = ipt_account_tables[table_nr].itemcount;
 521
 522     // allocate "root" table
 523     if (!(ipt_account_handles[handle].data = (void*)get_zeroed_page(GFP_KERNEL)))
 524     {
 525         printk("ACCOUNT: out of memory for root table in ipt_account_handle_prepare_read()\n");
 526         memset (&ipt_account_handles[handle], 0, sizeof(struct ipt_account_handle));
 527         return -1;
 528     }
 529
 530     // Recursive copy of complete data structure
 531     unsigned int depth = ipt_account_handles[handle].depth;
 532     if (depth == 0)
 533     {
 534         memcpy(ipt_account_handles[handle].data, ipt_account_tables[table_nr].data, sizeof(struct ipt_account_mask_24));
 535     } else if (depth == 1) {
 536         struct ipt_account_mask_16 *src_16 = (struct ipt_account_mask_16 *)ipt_account_tables[table_nr].data;
 537         struct ipt_account_mask_16 *network_16 = (struct ipt_account_mask_16 *)ipt_account_handles[handle].data;
 538         unsigned char b;
 539
 540         for (b = 0; b < 255; b++)
 541         {
 542             if (src_16->mask_24[b])
 543             {
 544                 if (!(network_16->mask_24[b] = (void*)get_zeroed_page(GFP_KERNEL)))
 545                 {
 546                     printk("ACCOUNT: out of memory during copy of 16 bit network in ipt_account_handle_prepare_read()\n");
 547                     ipt_account_data_free(ipt_account_handles[handle].data, depth);
 548                     memset (&ipt_account_handles[handle], 0, sizeof(struct ipt_account_handle));
 549                     return -1;
 550                 }
 551
 552                 memcpy(network_16->mask_24[b], src_16->mask_24[b], sizeof(struct ipt_account_mask_24));
 553             }
 554         }
 555     } else if(depth == 2) {
 556         struct ipt_account_mask_8 *src_8 = (struct ipt_account_mask_8 *)ipt_account_tables[table_nr].data;
 557         struct ipt_account_mask_8 *network_8 = (struct ipt_account_mask_8 *)ipt_account_handles[handle].data;
 558         unsigned char a;
 559
 560         for (a = 0; a < 255; a++)
 561         {
 562             if (src_8->mask_16[a])
 563             {
 564                 if (!(network_8->mask_16[a] = (void*)get_zeroed_page(GFP_KERNEL)))
 565                 {
 566                     printk("ACCOUNT: out of memory during copy of 24 bit network in ipt_account_handle_prepare_read()\n");
 567                     ipt_account_data_free(ipt_account_handles[handle].data, depth);
 568                     memset (&ipt_account_handles[handle], 0, sizeof(struct ipt_account_handle));
 569                     return -1;
 570                 }
 571
 572                 memcpy(network_8->mask_16[a], src_8->mask_16[a], sizeof(struct ipt_account_mask_16));
 573
 574                 struct ipt_account_mask_16 *src_16 = src_8->mask_16[a];
 575                 struct ipt_account_mask_16 *network_16 = network_8->mask_16[a];
 576                 unsigned char b;
 577
 578                 for (b = 0; b < 255; b++)
 579                 {
 580                     if (src_16->mask_24[b])
 581                     {
 582                         if (!(network_16->mask_24[b] = (void*)get_zeroed_page(GFP_KERNEL)))
 583                         {
 584                             printk("ACCOUNT: out of memory during copy of 16 bit network in ipt_account_handle_prepare_read()\n");
 585                             ipt_account_data_free(ipt_account_handles[handle].data, depth);
 586                             memset (&ipt_account_handles[handle], 0, sizeof(struct ipt_account_handle));
 587                             return -1;
 588                         }
 589
 590                         memcpy(network_16->mask_24[b], src_16->mask_24[b], sizeof(struct ipt_account_mask_24));
 591                     }
 592                 }
 593             }
 594         }
 595     }
 596
 597     *count = ipt_account_tables[table_nr].itemcount;
 598     return handle;
 599 }
 600
 601 /* Prepare data for read and flush it */
 602 int ipt_account_handle_prepare_read_flush(char *tablename, unsigned int *count)
 603 {
 604     int handle, i, table_nr=-1;
 605
 606     for (i = 0; i < ACCOUNT_MAX_TABLES; i++)
 607         if (strncmp(ipt_account_tables[i].name, tablename, ACCOUNT_TABLE_NAME_LEN) == 0)
 608         {
 609             table_nr = i;
 610             break;
 611         }
 612
 613     if (table_nr == -1)
 614     {
 615         printk("ACCOUNT: ipt_account_handle_prepare_read_flush(): Table %s not found\n", tablename);
 616         return -1;
 617     }
 618
 619     // Can't find a free handle slot?
 620     if ((handle = ipt_account_handle_find_slot()) == -1)
 621         return -1;
 622
 623     // Fill up handle structure
 624     ipt_account_handles[handle].ip = ipt_account_tables[table_nr].ip;
 625     ipt_account_handles[handle].depth = ipt_account_tables[table_nr].depth;
 626     ipt_account_handles[handle].itemcount = ipt_account_tables[table_nr].itemcount;
 627     ipt_account_handles[handle].data = ipt_account_tables[table_nr].data;
 628     *count = ipt_account_tables[table_nr].itemcount;
 629
 630     // "Flush" table data
 631     ipt_account_tables[table_nr].data = (void*)get_zeroed_page(GFP_KERNEL);
 632     ipt_account_tables[table_nr].itemcount = 0;
 633
 634     return handle;
 635 }
 636
 637 /* Copy the actual that into a prepared buffer.
 638    We only copy entries != 0 to increase performance.
 639    The memory gets freed again in ipt_account_handle_free().
 640 */
 641 int ipt_account_handle_get_data(unsigned int handle, void *buffer)
 642 {
 643     struct ipt_account_handle_ip handle_ip;
 644     unsigned int handle_ip_size = sizeof (struct ipt_account_handle_ip);
 645     unsigned char i;
 646
 647     if (handle >= ACCOUNT_MAX_HANDLES)
 648     {
 649         printk("ACCOUNT: invalid handle for ipt_account_handle_get_data() specified: %u\n", handle);
 650         return -1;
 651     }
 652
 653     if (ipt_account_handles[handle].data == NULL)
 654     {
 655         printk("ACCOUNT: handle %u is BROKEN: Contains no data\n", handle);
 656         return -1;
 657     }
 658
 659     // Check if at least packet src/dst matches ip/netmask
 660     unsigned int net_ip = ipt_account_handles[handle].ip;
 661     unsigned int depth = ipt_account_handles[handle].depth;
 662
 663     // 8 bit network
 664     if (depth == 0)
 665     {
 666         struct ipt_account_mask_24 *network = (struct ipt_account_mask_24*)ipt_account_handles[handle].data;
 667         for (i = 0; i < 255; i++)
 668         {
 669             if (network->ip[i].src_packets || network->ip[i].dst_packets)
 670             {
 671                 handle_ip.ip = net_ip | (i<<24);
 672                 handle_ip.src_packets = network->ip[i].src_packets;
 673                 handle_ip.src_bytes = network->ip[i].src_bytes;
 674                 handle_ip.dst_packets = network->ip[i].dst_packets;
 675                 handle_ip.dst_bytes = network->ip[i].dst_bytes;
 676
 677                 copy_to_user(buffer, &handle_ip, handle_ip_size);
 678                 buffer += handle_ip_size;
 679             }
 680         }
 681
 682         return 0;
 683     }
 684
 685     // 16 bit network
 686     if (depth == 1)
 687     {
 688         struct ipt_account_mask_16 *network_16 = (struct ipt_account_mask_16*)ipt_account_handles[handle].data;
 689         unsigned char b;
 690         for (b = 0; b < 255; b++)
 691         {
 692             if (network_16->mask_24[b])
 693             {
 694                 struct ipt_account_mask_24 *network = (struct ipt_account_mask_24*)network_16->mask_24[b];
 695                 for (i = 0; i < 255; i++)
 696                 {
 697                     if (network->ip[i].src_packets || network->ip[i].dst_packets)
 698                     {
 699                         handle_ip.ip = net_ip | (b << 16) | (i<<24);
 700                         handle_ip.src_packets = network->ip[i].src_packets;
 701                         handle_ip.src_bytes = network->ip[i].src_bytes;
 702                         handle_ip.dst_packets = network->ip[i].dst_packets;
 703                         handle_ip.dst_bytes = network->ip[i].dst_bytes;
 704
 705                         copy_to_user(buffer, &handle_ip, handle_ip_size);
 706                         buffer += handle_ip_size;
 707                     }
 708                 }
 709             }
 710         }
 711
 712         return 0;
 713     }
 714
 715     // 24 bit network
 716     if (depth == 2)
 717     {
 718         struct ipt_account_mask_8 *network_8 = (struct ipt_account_mask_8*)ipt_account_handles[handle].data;
 719         unsigned char a, b;
 720         for (a = 0; a < 255; a++)
 721         {
 722             if (network_8->mask_16[a])
 723             {
 724                 struct ipt_account_mask_16 *network_16 = (struct ipt_account_mask_16*)network_8->mask_16[a];
 725                 for (b = 0; b < 255; b++)
 726                 {
 727                     if (network_16->mask_24[b])
 728                     {
 729                         struct ipt_account_mask_24 *network = (struct ipt_account_mask_24*)network_16->mask_24[b];
 730                         for (i = 0; i < 255; i++)
 731                         {
 732                             if (network->ip[i].src_packets || network->ip[i].dst_packets)
 733                             {
 734                                 handle_ip.ip = net_ip | (a << 8) | (b << 16) | (i<<24);
 735                                 handle_ip.src_packets = network->ip[i].src_packets;
 736                                 handle_ip.src_bytes = network->ip[i].src_bytes;
 737                                 handle_ip.dst_packets = network->ip[i].dst_packets;
 738                                 handle_ip.dst_bytes = network->ip[i].dst_bytes;
 739
 740                                 copy_to_user(buffer, &handle_ip, handle_ip_size);
 741                                 buffer += handle_ip_size;
 742                             }
 743                         }
 744                     }
 745                 }
 746             }
 747         }
 748
 749         return 0;
 750     }
 751
 752     return -1;
 753 }
 754
 755 static int ipt_account_set_ctl(struct sock *sk, int cmd, void *user, unsigned int len)
 756 {
 757     struct ipt_account_handle_sockopt handle;
 758     int ret = -EINVAL;
 759
 760     if (!capable(CAP_NET_ADMIN))
 761             return -EPERM;
 762
 763     switch (cmd)
 764     {
 765         case IPT_SO_SET_ACCOUNT_HANDLE_FREE:
 766             if (len != sizeof(struct ipt_account_handle_sockopt))
 767             {
 768                 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));
 769                 break;
 770             }
 771
 772             if (copy_from_user (&handle, user, len))
 773             {
 774                 printk("ACCOUNT: ipt_account_set_ctl: copy_from_user failed for IPT_SO_SET_HANDLE_FREE\n");
 775                 break;
 776             }
 777
 778             spin_lock_bh(&ipt_account_lock);
 779             ret = ipt_account_handle_free(handle.handle_nr);
 780             spin_unlock_bh(&ipt_account_lock);
 781             break;
 782         default:
 783             printk("ACCOUNT: ipt_account_set_ctl: unknown request %i\n", cmd);
 784     }
 785
 786     return ret;
 787 }
 788
 789 static int ipt_account_get_ctl(struct sock *sk, int cmd, void *user, int *len)
 790 {
 791     struct ipt_account_handle_sockopt handle;
 792     int ret = -EINVAL;
 793
 794     if (!capable(CAP_NET_ADMIN))
 795             return -EPERM;
 796
 797     switch (cmd)
 798     {
 799         case IPT_SO_GET_ACCOUNT_PREPARE_READ_FLUSH:
 800         case IPT_SO_GET_ACCOUNT_PREPARE_READ:
 801             if (*len < sizeof(struct ipt_account_handle_sockopt))
 802             {
 803                 printk("ACCOUNT: ipt_account_get_ctl: wrong data size (%u != %u) for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n",
 804                        *len, sizeof(struct ipt_account_handle_sockopt));
 805                 break;
 806             }
 807
 808             if (copy_from_user (&handle, user, sizeof(struct ipt_account_handle_sockopt)))
 809             {
 810                 printk("ACCOUNT: ipt_account_get_ctl: copy_from_user failed for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n");
 811                 break;
 812             }
 813
 814             spin_lock_bh(&ipt_account_lock);
 815             if (cmd == IPT_SO_GET_ACCOUNT_PREPARE_READ_FLUSH)
 816                 handle.handle_nr = ipt_account_handle_prepare_read_flush(handle.name, &handle.itemcount);
 817             else
 818                 handle.handle_nr = ipt_account_handle_prepare_read(handle.name, &handle.itemcount);
 819             spin_unlock_bh(&ipt_account_lock);
 820
 821             if (handle.handle_nr == -1)
 822             {
 823                 printk("ACCOUNT: ipt_account_get_ctl: ipt_account_handle_prepare_read failed\n");
 824                 break;
 825             }
 826
 827             if (copy_to_user(user, &handle, sizeof(struct ipt_account_handle_sockopt)))
 828             {
 829                 printk("ACCOUNT: ipt_account_set_ctl: copy_to_user failed for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n");
 830                 break;
 831             }
 832             ret = 0;
 833             break;
 834         case IPT_SO_GET_ACCOUNT_GET_DATA:
 835             if (*len < sizeof(struct ipt_account_handle_sockopt))
 836             {
 837                 printk("ACCOUNT: ipt_account_get_ctl: wrong data size (%u != %u) for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n",
 838                        *len, sizeof(struct ipt_account_handle_sockopt));
 839                 break;
 840             }
 841
 842             if (copy_from_user (&handle, user, sizeof(struct ipt_account_handle_sockopt)))
 843             {
 844                 printk("ACCOUNT: ipt_account_get_ctl: copy_from_user failed for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n");
 845                 break;
 846             }
 847
 848             if (handle.handle_nr >= ACCOUNT_MAX_HANDLES)
 849             {
 850                 printk("ACCOUNT: Invalid handle for IPT_SO_GET_ACCOUNT_GET_DATA: %u\n", handle.handle_nr);
 851                 break;
 852             }
 853
 854             if (*len < ipt_account_handles[handle.handle_nr].itemcount*sizeof(struct ipt_account_handle_ip))
 855             {
 856                 printk("ACCOUNT: ipt_account_get_ctl: not enough space (%u < %u) to store data from IPT_SO_GET_ACCOUNT_GET_DATA\n",
 857                        *len, ipt_account_handles[handle.handle_nr].itemcount*sizeof(struct ipt_account_handle_ip));
 858                 break;
 859             }
 860
 861             spin_lock_bh(&ipt_account_lock);
 862             ret = ipt_account_handle_get_data(handle.handle_nr, user);
 863             spin_unlock_bh(&ipt_account_lock);
 864             if (ret)
 865             {
 866                 printk("ACCOUNT: ipt_account_get_ctl: ipt_account_handle_get_data failed for handle %u\n", handle.handle_nr);
 867                 break;
 868             }
 869
 870             ret = 0;
 871             break;
 872
 873         default:
 874             printk("ACCOUNT: ipt_account_get_ctl: unknown request %i\n", cmd);
 875     }
 876
 877     return ret;
 878 }
 879
 880 static struct ipt_target ipt_account_reg
 881 = { { NULL, NULL }, "ACCOUNT", ipt_account_target, ipt_account_checkentry, ipt_account_deleteentry,
 882     THIS_MODULE };
 883
 884 static struct nf_sockopt_ops ipt_account_sockopts
 885 = { { NULL, NULL }, PF_INET, IPT_SO_SET_ACCOUNT_HANDLE_FREE, IPT_SO_SET_ACCOUNT_MAX+1, ipt_account_set_ctl,
 886     IPT_SO_GET_ACCOUNT_PREPARE_READ, IPT_SO_GET_ACCOUNT_MAX+1, ipt_account_get_ctl, 0, NULL  };
 887
 888 static int __init init(void)
 889 {
 890     if (PAGE_SIZE < 4096)
 891     {
 892         printk("ACCOUNT: Sorry we need at least a PAGE_SIZE of 4096. Found: %lu\n", PAGE_SIZE);
 893         return -EINVAL;
 894     }
 895
 896     if (!(ipt_account_tables = kmalloc(ACCOUNT_MAX_TABLES*sizeof(struct ipt_account_table), GFP_KERNEL)))
 897     {
 898         printk("ACCOUNT: Out of memory allocating account_tables structure");
 899         return -EINVAL;
 900     }
 901     memset(ipt_account_tables, 0, ACCOUNT_MAX_TABLES*sizeof(struct ipt_account_table));
 902
 903     if (!(ipt_account_handles = kmalloc(ACCOUNT_MAX_HANDLES*sizeof(struct ipt_account_handle), GFP_KERNEL)))
 904     {
 905         printk("ACCOUNT: Out of memory allocating account_handles structure");
 906         kfree (ipt_account_tables);
 907         ipt_account_tables = NULL;
 908         return -EINVAL;
 909     }
 910     memset(ipt_account_handles, 0, ACCOUNT_MAX_HANDLES*sizeof(struct ipt_account_handle));
 911
 912     /* Register setsockopt */
 913     if (nf_register_sockopt(&ipt_account_sockopts) < 0)
 914     {
 915         printk("ACCOUNT: Can't register sockopts. Aborting\n");
 916
 917         kfree (ipt_account_tables);
 918         ipt_account_tables = NULL;
 919         kfree(ipt_account_handles);
 920         ipt_account_handles = NULL;
 921
 922         return -EINVAL;
 923     }
 924
 925     if (ipt_register_target(&ipt_account_reg))
 926             return -EINVAL;
 927
 928     return 0;
 929 }
 930
 931 static void __exit fini(void)
 932 {
 933     ipt_unregister_target(&ipt_account_reg);
 934
 935     nf_unregister_sockopt(&ipt_account_sockopts);
 936
 937     kfree(ipt_account_tables);
 938     ipt_account_tables = NULL;
 939
 940     kfree(ipt_account_handles);
 941     ipt_account_handles = NULL;
 942 }
 943
 944 module_init(init);
 945 module_exit(fini);
 946 MODULE_LICENSE("GPL");