| 1 | /*************************************************************************** |
| 2 | * This is a module which is used for counting packets. * |
| 3 | * See http://www.intra2net.com/opensource/ipt_account * |
| 4 | * for further information * |
| 5 | * * |
| 6 | * Copyright (C) 2004-2011 by Intra2net AG * |
| 7 | * opensource@intra2net.com * |
| 8 | * * |
| 9 | * This program is free software; you can redistribute it and/or modify * |
| 10 | * it under the terms of the GNU General Public License * |
| 11 | * version 2 as published by the Free Software Foundation; * |
| 12 | * * |
| 13 | ***************************************************************************/ |
| 14 | |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/version.h> |
| 17 | #include <linux/skbuff.h> |
| 18 | #include <linux/ip.h> |
| 19 | #include <net/icmp.h> |
| 20 | #include <net/udp.h> |
| 21 | #include <net/tcp.h> |
| 22 | #include <linux/netfilter_ipv4/ip_tables.h> |
| 23 | |
| 24 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,27) |
| 25 | #include <linux/semaphore.h> |
| 26 | #else |
| 27 | #include <asm/semaphore.h> |
| 28 | #endif |
| 29 | |
| 30 | #include <linux/kernel.h> |
| 31 | #include <linux/mm.h> |
| 32 | #include <linux/string.h> |
| 33 | #include <linux/spinlock.h> |
| 34 | #include <asm/uaccess.h> |
| 35 | |
| 36 | #include <net/route.h> |
| 37 | #include <linux/netfilter_ipv4/ipt_ACCOUNT.h> |
| 38 | |
| 39 | #if 0 |
| 40 | #define DEBUGP printk |
| 41 | #else |
| 42 | #define DEBUGP(format, args...) |
| 43 | #endif |
| 44 | |
| 45 | #if (PAGE_SIZE < 4096) |
| 46 | #error "ipt_ACCOUNT needs at least a PAGE_SIZE of 4096" |
| 47 | #endif |
| 48 | |
| 49 | static struct ipt_acc_table *ipt_acc_tables = NULL; |
| 50 | static struct ipt_acc_handle *ipt_acc_handles = NULL; |
| 51 | static void *ipt_acc_tmpbuf = NULL; |
| 52 | |
| 53 | /* Spinlock used for manipulating the current accounting tables/data */ |
| 54 | static DEFINE_SPINLOCK(ipt_acc_lock); |
| 55 | /* Mutex (semaphore) used for manipulating userspace handles/snapshot data */ |
| 56 | static struct semaphore ipt_acc_userspace_mutex; |
| 57 | |
| 58 | /* Allocates a page and clears it */ |
| 59 | static void *ipt_acc_zalloc_page(void) |
| 60 | { |
| 61 | // Don't use get_zeroed_page until it's fixed in the kernel. |
| 62 | // get_zeroed_page(GFP_ATOMIC) |
| 63 | void *mem = (void *)__get_free_page(GFP_ATOMIC); |
| 64 | if (mem) { |
| 65 | memset (mem, 0, PAGE_SIZE); |
| 66 | } |
| 67 | |
| 68 | return mem; |
| 69 | } |
| 70 | |
| 71 | /* Recursive free of all data structures */ |
| 72 | static void ipt_acc_data_free(void *data, unsigned char depth) |
| 73 | { |
| 74 | /* Empty data set */ |
| 75 | if (!data) |
| 76 | return; |
| 77 | |
| 78 | /* Free for 8 bit network */ |
| 79 | if (depth == 0) { |
| 80 | free_page((unsigned long)data); |
| 81 | return; |
| 82 | } |
| 83 | |
| 84 | /* Free for 16 bit network */ |
| 85 | if (depth == 1) { |
| 86 | struct ipt_acc_mask_16 *mask_16 = (struct ipt_acc_mask_16 *)data; |
| 87 | unsigned int b; |
| 88 | for (b=0; b <= 255; b++) { |
| 89 | if (mask_16->mask_24[b]) { |
| 90 | free_page((unsigned long)mask_16->mask_24[b]); |
| 91 | } |
| 92 | } |
| 93 | free_page((unsigned long)data); |
| 94 | return; |
| 95 | } |
| 96 | |
| 97 | /* Free for 24 bit network */ |
| 98 | if (depth == 2) { |
| 99 | unsigned int a, b; |
| 100 | for (a=0; a <= 255; a++) { |
| 101 | if (((struct ipt_acc_mask_8 *)data)->mask_16[a]) { |
| 102 | struct ipt_acc_mask_16 *mask_16 = (struct ipt_acc_mask_16*) |
| 103 | ((struct ipt_acc_mask_8 *)data)->mask_16[a]; |
| 104 | |
| 105 | for (b=0; b <= 255; b++) { |
| 106 | if (mask_16->mask_24[b]) { |
| 107 | free_page((unsigned long)mask_16->mask_24[b]); |
| 108 | } |
| 109 | } |
| 110 | free_page((unsigned long)mask_16); |
| 111 | } |
| 112 | } |
| 113 | free_page((unsigned long)data); |
| 114 | return; |
| 115 | } |
| 116 | |
| 117 | printk("ACCOUNT: ipt_acc_data_free called with unknown depth: %d\n", |
| 118 | depth); |
| 119 | return; |
| 120 | } |
| 121 | |
| 122 | /* Look for existing table / insert new one. |
| 123 | Return internal ID or -1 on error */ |
| 124 | static int ipt_acc_table_insert(char *name, u_int32_t ip, u_int32_t netmask) |
| 125 | { |
| 126 | unsigned int i; |
| 127 | |
| 128 | DEBUGP("ACCOUNT: ipt_acc_table_insert: %s, %pI4/%pI4\n", |
| 129 | name, &ip, &netmask); |
| 130 | |
| 131 | /* Look for existing table */ |
| 132 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) { |
| 133 | if (strncmp(ipt_acc_tables[i].name, name, |
| 134 | ACCOUNT_TABLE_NAME_LEN) == 0) { |
| 135 | DEBUGP("ACCOUNT: Found existing slot: %d - " |
| 136 | "%pI4/%pI4\n", i, |
| 137 | &ipt_acc_tables[i].ip, |
| 138 | &ipt_acc_tables[i].netmask); |
| 139 | |
| 140 | if (ipt_acc_tables[i].ip != ip |
| 141 | || ipt_acc_tables[i].netmask != netmask) { |
| 142 | printk("ACCOUNT: Table %s found, but IP/netmask mismatch. " |
| 143 | "IP/netmask found: %pI4/%pI4\n", |
| 144 | name, &ipt_acc_tables[i].ip, |
| 145 | &ipt_acc_tables[i].netmask); |
| 146 | return -1; |
| 147 | } |
| 148 | |
| 149 | ipt_acc_tables[i].refcount++; |
| 150 | DEBUGP("ACCOUNT: Refcount: %d\n", ipt_acc_tables[i].refcount); |
| 151 | return i; |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | /* Insert new table */ |
| 156 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) { |
| 157 | /* Found free slot */ |
| 158 | if (ipt_acc_tables[i].name[0] == 0) { |
| 159 | unsigned int netsize=0; |
| 160 | u_int32_t calc_mask; |
| 161 | int j; /* needs to be signed, otherwise we risk endless loop */ |
| 162 | |
| 163 | DEBUGP("ACCOUNT: Found free slot: %d\n", i); |
| 164 | strncpy (ipt_acc_tables[i].name, name, ACCOUNT_TABLE_NAME_LEN-1); |
| 165 | |
| 166 | ipt_acc_tables[i].ip = ip; |
| 167 | ipt_acc_tables[i].netmask = netmask; |
| 168 | |
| 169 | /* Calculate netsize */ |
| 170 | calc_mask = htonl(netmask); |
| 171 | for (j = 31; j >= 0; j--) { |
| 172 | if (calc_mask&(1<<j)) |
| 173 | netsize++; |
| 174 | else |
| 175 | break; |
| 176 | } |
| 177 | |
| 178 | /* Calculate depth from netsize */ |
| 179 | if (netsize >= 24) |
| 180 | ipt_acc_tables[i].depth = 0; |
| 181 | else if (netsize >= 16) |
| 182 | ipt_acc_tables[i].depth = 1; |
| 183 | else if(netsize >= 8) |
| 184 | ipt_acc_tables[i].depth = 2; |
| 185 | |
| 186 | DEBUGP("ACCOUNT: calculated netsize: %u -> " |
| 187 | "ipt_acc_table depth %u\n", netsize, |
| 188 | ipt_acc_tables[i].depth); |
| 189 | |
| 190 | ipt_acc_tables[i].refcount++; |
| 191 | if ((ipt_acc_tables[i].data |
| 192 | = ipt_acc_zalloc_page()) == NULL) { |
| 193 | printk("ACCOUNT: out of memory for data of table: %s\n", name); |
| 194 | memset(&ipt_acc_tables[i], 0, |
| 195 | sizeof(struct ipt_acc_table)); |
| 196 | return -1; |
| 197 | } |
| 198 | |
| 199 | return i; |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | /* No free slot found */ |
| 204 | printk("ACCOUNT: No free table slot found (max: %d). " |
| 205 | "Please increase ACCOUNT_MAX_TABLES.\n", ACCOUNT_MAX_TABLES); |
| 206 | return -1; |
| 207 | } |
| 208 | |
| 209 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36) |
| 210 | static int ipt_acc_checkentry(const struct xt_tgchk_param *par) |
| 211 | #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,28) |
| 212 | static bool ipt_acc_checkentry(const struct xt_tgchk_param *par) |
| 213 | #else |
| 214 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23) |
| 215 | static bool ipt_acc_checkentry(const char *tablename, |
| 216 | #else |
| 217 | static int ipt_acc_checkentry(const char *tablename, |
| 218 | #endif |
| 219 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16) |
| 220 | const void *e, |
| 221 | #else |
| 222 | const struct ipt_entry *e, |
| 223 | #endif |
| 224 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,17) |
| 225 | const struct xt_target *target, |
| 226 | #endif |
| 227 | void *targinfo, |
| 228 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19) |
| 229 | unsigned int targinfosize, |
| 230 | #endif |
| 231 | unsigned int hook_mask) |
| 232 | #endif /* >= 2.6.28 */ |
| 233 | { |
| 234 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,28) |
| 235 | struct ipt_acc_info *info = par->targinfo; |
| 236 | #else |
| 237 | struct ipt_acc_info *info = targinfo; |
| 238 | #endif |
| 239 | int table_nr; |
| 240 | |
| 241 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,17) |
| 242 | if (targinfosize != IPT_ALIGN(sizeof(struct ipt_acc_info))) { |
| 243 | DEBUGP("ACCOUNT: targinfosize %u != %u\n", |
| 244 | targinfosize, IPT_ALIGN(sizeof(struct ipt_acc_info))); |
| 245 | return 0; |
| 246 | } |
| 247 | #endif |
| 248 | |
| 249 | spin_lock_bh(&ipt_acc_lock); |
| 250 | table_nr = ipt_acc_table_insert(info->table_name, info->net_ip, |
| 251 | info->net_mask); |
| 252 | spin_unlock_bh(&ipt_acc_lock); |
| 253 | |
| 254 | if (table_nr == -1) { |
| 255 | printk("ACCOUNT: Table insert problem. Aborting\n"); |
| 256 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36) |
| 257 | return -EINVAL; |
| 258 | #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23) |
| 259 | return false; |
| 260 | #else |
| 261 | return 0; |
| 262 | #endif |
| 263 | } |
| 264 | /* Table nr caching so we don't have to do an extra string compare |
| 265 | for every packet */ |
| 266 | info->table_nr = table_nr; |
| 267 | |
| 268 | /* All fine */ |
| 269 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36) |
| 270 | return 0; |
| 271 | #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23) |
| 272 | return true; |
| 273 | #else |
| 274 | return 1; |
| 275 | #endif |
| 276 | } |
| 277 | |
| 278 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,28) |
| 279 | static void ipt_acc_destroy(const struct xt_tgdtor_param *par) |
| 280 | #else |
| 281 | static void ipt_acc_destroy( |
| 282 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,17) |
| 283 | const struct xt_target *target, |
| 284 | #endif |
| 285 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,19) |
| 286 | void *targinfo) |
| 287 | #else |
| 288 | void *targinfo, |
| 289 | unsigned int targinfosize) |
| 290 | #endif |
| 291 | #endif /* >= 2.6.28 */ |
| 292 | { |
| 293 | unsigned int i; |
| 294 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,28) |
| 295 | struct ipt_acc_info *info = par->targinfo; |
| 296 | #else |
| 297 | struct ipt_acc_info *info = targinfo; |
| 298 | #endif |
| 299 | |
| 300 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,17) |
| 301 | if (targinfosize != IPT_ALIGN(sizeof(struct ipt_acc_info))) { |
| 302 | DEBUGP("ACCOUNT: targinfosize %u != %u\n", |
| 303 | targinfosize, IPT_ALIGN(sizeof(struct ipt_acc_info))); |
| 304 | } |
| 305 | #endif |
| 306 | |
| 307 | spin_lock_bh(&ipt_acc_lock); |
| 308 | |
| 309 | DEBUGP("ACCOUNT: ipt_acc_deleteentry called for table: %s (#%d)\n", |
| 310 | info->table_name, info->table_nr); |
| 311 | |
| 312 | info->table_nr = -1; /* Set back to original state */ |
| 313 | |
| 314 | /* Look for table */ |
| 315 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) { |
| 316 | if (strncmp(ipt_acc_tables[i].name, info->table_name, |
| 317 | ACCOUNT_TABLE_NAME_LEN) == 0) { |
| 318 | DEBUGP("ACCOUNT: Found table at slot: %d\n", i); |
| 319 | |
| 320 | ipt_acc_tables[i].refcount--; |
| 321 | DEBUGP("ACCOUNT: Refcount left: %d\n", |
| 322 | ipt_acc_tables[i].refcount); |
| 323 | |
| 324 | /* Table not needed anymore? */ |
| 325 | if (ipt_acc_tables[i].refcount == 0) { |
| 326 | DEBUGP("ACCOUNT: Destroying table at slot: %d\n", i); |
| 327 | ipt_acc_data_free(ipt_acc_tables[i].data, |
| 328 | ipt_acc_tables[i].depth); |
| 329 | memset(&ipt_acc_tables[i], 0, |
| 330 | sizeof(struct ipt_acc_table)); |
| 331 | } |
| 332 | |
| 333 | spin_unlock_bh(&ipt_acc_lock); |
| 334 | return; |
| 335 | } |
| 336 | } |
| 337 | |
| 338 | /* Table not found */ |
| 339 | printk("ACCOUNT: Table %s not found for destroy\n", info->table_name); |
| 340 | spin_unlock_bh(&ipt_acc_lock); |
| 341 | } |
| 342 | |
| 343 | static void ipt_acc_depth0_insert(struct ipt_acc_mask_24 *mask_24, |
| 344 | u_int32_t net_ip, u_int32_t netmask, |
| 345 | u_int32_t src_ip, u_int32_t dst_ip, |
| 346 | u_int32_t size, u_int32_t *itemcount) |
| 347 | { |
| 348 | unsigned char is_src = 0, is_dst = 0, src_slot, dst_slot; |
| 349 | char is_src_new_ip = 0, is_dst_new_ip = 0; /* Check if this entry is new */ |
| 350 | |
| 351 | DEBUGP("ACCOUNT: ipt_acc_depth0_insert: %pI4/%pI4 " |
| 352 | "for net %pI4/%pI4, size: %u\n", &src_ip, |
| 353 | &dst_ip, &net_ip, &netmask, size); |
| 354 | |
| 355 | /* Check if src/dst is inside our network. */ |
| 356 | /* Special: net_ip = 0.0.0.0/0 gets stored as src in slot 0 */ |
| 357 | if (!netmask) |
| 358 | src_ip = 0; |
| 359 | if ((net_ip&netmask) == (src_ip&netmask)) |
| 360 | is_src = 1; |
| 361 | if ((net_ip&netmask) == (dst_ip&netmask) && netmask) |
| 362 | is_dst = 1; |
| 363 | |
| 364 | if (!is_src && !is_dst) { |
| 365 | DEBUGP("ACCOUNT: Skipping packet %pI4/%pI4 " |
| 366 | "for net %pI4/%pI4\n", &src_ip, |
| 367 | &dst_ip, &net_ip, &netmask); |
| 368 | return; |
| 369 | } |
| 370 | |
| 371 | /* Calculate array positions */ |
| 372 | src_slot = (unsigned char)((src_ip&0xFF000000) >> 24); |
| 373 | dst_slot = (unsigned char)((dst_ip&0xFF000000) >> 24); |
| 374 | |
| 375 | /* Increase size counters */ |
| 376 | if (is_src) { |
| 377 | /* Calculate network slot */ |
| 378 | DEBUGP("ACCOUNT: Calculated SRC 8 bit network slot: %d\n", src_slot); |
| 379 | if (!mask_24->ip[src_slot].src_packets |
| 380 | && !mask_24->ip[src_slot].dst_packets) |
| 381 | is_src_new_ip = 1; |
| 382 | |
| 383 | mask_24->ip[src_slot].src_packets++; |
| 384 | mask_24->ip[src_slot].src_bytes+=size; |
| 385 | } |
| 386 | if (is_dst) { |
| 387 | DEBUGP("ACCOUNT: Calculated DST 8 bit network slot: %d\n", dst_slot); |
| 388 | if (!mask_24->ip[dst_slot].src_packets |
| 389 | && !mask_24->ip[dst_slot].dst_packets) |
| 390 | is_dst_new_ip = 1; |
| 391 | |
| 392 | mask_24->ip[dst_slot].dst_packets++; |
| 393 | mask_24->ip[dst_slot].dst_bytes+=size; |
| 394 | } |
| 395 | |
| 396 | /* Increase itemcounter */ |
| 397 | DEBUGP("ACCOUNT: Itemcounter before: %d\n", *itemcount); |
| 398 | if (src_slot == dst_slot) { |
| 399 | if (is_src_new_ip || is_dst_new_ip) { |
| 400 | DEBUGP("ACCOUNT: src_slot == dst_slot: %d, %d\n", |
| 401 | is_src_new_ip, is_dst_new_ip); |
| 402 | (*itemcount)++; |
| 403 | } |
| 404 | } else { |
| 405 | if (is_src_new_ip) { |
| 406 | DEBUGP("ACCOUNT: New src_ip: %pI4\n", &src_ip); |
| 407 | (*itemcount)++; |
| 408 | } |
| 409 | if (is_dst_new_ip) { |
| 410 | DEBUGP("ACCOUNT: New dst_ip: %pI4\n", &dst_ip); |
| 411 | (*itemcount)++; |
| 412 | } |
| 413 | } |
| 414 | DEBUGP("ACCOUNT: Itemcounter after: %d\n", *itemcount); |
| 415 | } |
| 416 | |
| 417 | static void ipt_acc_depth1_insert(struct ipt_acc_mask_16 *mask_16, |
| 418 | u_int32_t net_ip, u_int32_t netmask, |
| 419 | u_int32_t src_ip, u_int32_t dst_ip, |
| 420 | u_int32_t size, u_int32_t *itemcount) |
| 421 | { |
| 422 | /* Do we need to process src IP? */ |
| 423 | if ((net_ip&netmask) == (src_ip&netmask)) { |
| 424 | unsigned char slot = (unsigned char)((src_ip&0x00FF0000) >> 16); |
| 425 | DEBUGP("ACCOUNT: Calculated SRC 16 bit network slot: %d\n", slot); |
| 426 | |
| 427 | /* Do we need to create a new mask_24 bucket? */ |
| 428 | if (!mask_16->mask_24[slot] && (mask_16->mask_24[slot] = |
| 429 | ipt_acc_zalloc_page()) == NULL) { |
| 430 | printk("ACCOUNT: Can't process packet because out of memory!\n"); |
| 431 | return; |
| 432 | } |
| 433 | |
| 434 | ipt_acc_depth0_insert((struct ipt_acc_mask_24 *)mask_16->mask_24[slot], |
| 435 | net_ip, netmask, src_ip, 0, size, itemcount); |
| 436 | } |
| 437 | |
| 438 | /* Do we need to process dst IP? */ |
| 439 | if ((net_ip&netmask) == (dst_ip&netmask)) { |
| 440 | unsigned char slot = (unsigned char)((dst_ip&0x00FF0000) >> 16); |
| 441 | DEBUGP("ACCOUNT: Calculated DST 16 bit network slot: %d\n", slot); |
| 442 | |
| 443 | /* Do we need to create a new mask_24 bucket? */ |
| 444 | if (!mask_16->mask_24[slot] && (mask_16->mask_24[slot] |
| 445 | = ipt_acc_zalloc_page()) == NULL) { |
| 446 | printk("ACCOUT: Can't process packet because out of memory!\n"); |
| 447 | return; |
| 448 | } |
| 449 | |
| 450 | ipt_acc_depth0_insert((struct ipt_acc_mask_24 *)mask_16->mask_24[slot], |
| 451 | net_ip, netmask, 0, dst_ip, size, itemcount); |
| 452 | } |
| 453 | } |
| 454 | |
| 455 | static void ipt_acc_depth2_insert(struct ipt_acc_mask_8 *mask_8, |
| 456 | u_int32_t net_ip, u_int32_t netmask, |
| 457 | u_int32_t src_ip, u_int32_t dst_ip, |
| 458 | u_int32_t size, u_int32_t *itemcount) |
| 459 | { |
| 460 | /* Do we need to process src IP? */ |
| 461 | if ((net_ip&netmask) == (src_ip&netmask)) { |
| 462 | unsigned char slot = (unsigned char)((src_ip&0x0000FF00) >> 8); |
| 463 | DEBUGP("ACCOUNT: Calculated SRC 24 bit network slot: %d\n", slot); |
| 464 | |
| 465 | /* Do we need to create a new mask_24 bucket? */ |
| 466 | if (!mask_8->mask_16[slot] && (mask_8->mask_16[slot] |
| 467 | = ipt_acc_zalloc_page()) == NULL) { |
| 468 | printk("ACCOUNT: Can't process packet because out of memory!\n"); |
| 469 | return; |
| 470 | } |
| 471 | |
| 472 | ipt_acc_depth1_insert((struct ipt_acc_mask_16 *)mask_8->mask_16[slot], |
| 473 | net_ip, netmask, src_ip, 0, size, itemcount); |
| 474 | } |
| 475 | |
| 476 | /* Do we need to process dst IP? */ |
| 477 | if ((net_ip&netmask) == (dst_ip&netmask)) { |
| 478 | unsigned char slot = (unsigned char)((dst_ip&0x0000FF00) >> 8); |
| 479 | DEBUGP("ACCOUNT: Calculated DST 24 bit network slot: %d\n", slot); |
| 480 | |
| 481 | /* Do we need to create a new mask_24 bucket? */ |
| 482 | if (!mask_8->mask_16[slot] && (mask_8->mask_16[slot] |
| 483 | = ipt_acc_zalloc_page()) == NULL) { |
| 484 | printk("ACCOUNT: Can't process packet because out of memory!\n"); |
| 485 | return; |
| 486 | } |
| 487 | |
| 488 | ipt_acc_depth1_insert((struct ipt_acc_mask_16 *)mask_8->mask_16[slot], |
| 489 | net_ip, netmask, 0, dst_ip, size, itemcount); |
| 490 | } |
| 491 | } |
| 492 | |
| 493 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36) |
| 494 | static unsigned int ipt_acc_target(struct sk_buff *skb, const struct xt_action_param *par) |
| 495 | #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,28) |
| 496 | static unsigned int ipt_acc_target(struct sk_buff *skb, const struct xt_target_param *par) |
| 497 | #else |
| 498 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24) |
| 499 | static unsigned int ipt_acc_target(struct sk_buff *skb, |
| 500 | #else |
| 501 | static unsigned int ipt_acc_target(struct sk_buff **pskb, |
| 502 | #endif |
| 503 | const struct net_device *in, |
| 504 | const struct net_device *out, |
| 505 | unsigned int hooknum, |
| 506 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,17) |
| 507 | const struct xt_target *target, |
| 508 | #endif |
| 509 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,19) |
| 510 | const void *targinfo) |
| 511 | #else |
| 512 | const void *targinfo, |
| 513 | void *userinfo) |
| 514 | #endif |
| 515 | #endif /* 2.6.28 */ |
| 516 | { |
| 517 | const struct ipt_acc_info *info = |
| 518 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,28) |
| 519 | par->targinfo; |
| 520 | #else |
| 521 | (const struct ipt_acc_info *)targinfo; |
| 522 | #endif |
| 523 | |
| 524 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24) |
| 525 | u_int32_t src_ip = ip_hdr(skb)->saddr; |
| 526 | u_int32_t dst_ip = ip_hdr(skb)->daddr; |
| 527 | u_int32_t size = ntohs(ip_hdr(skb)->tot_len); |
| 528 | #else |
| 529 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22) |
| 530 | u_int32_t src_ip = ip_hdr(*pskb)->saddr; |
| 531 | u_int32_t dst_ip = ip_hdr(*pskb)->daddr; |
| 532 | u_int32_t size = ntohs(ip_hdr(*pskb)->tot_len); |
| 533 | #else |
| 534 | u_int32_t src_ip = (*pskb)->nh.iph->saddr; |
| 535 | u_int32_t dst_ip = (*pskb)->nh.iph->daddr; |
| 536 | u_int32_t size = ntohs((*pskb)->nh.iph->tot_len); |
| 537 | #endif |
| 538 | #endif |
| 539 | |
| 540 | spin_lock_bh(&ipt_acc_lock); |
| 541 | |
| 542 | if (ipt_acc_tables[info->table_nr].name[0] == 0) { |
| 543 | printk("ACCOUNT: ipt_acc_target: Invalid table id %u. " |
| 544 | "IPs %pI4/%pI4\n", info->table_nr, |
| 545 | &src_ip, &dst_ip); |
| 546 | spin_unlock_bh(&ipt_acc_lock); |
| 547 | return XT_CONTINUE; |
| 548 | } |
| 549 | |
| 550 | /* 8 bit network or "any" network */ |
| 551 | if (ipt_acc_tables[info->table_nr].depth == 0) { |
| 552 | /* Count packet and check if the IP is new */ |
| 553 | ipt_acc_depth0_insert( |
| 554 | (struct ipt_acc_mask_24 *)ipt_acc_tables[info->table_nr].data, |
| 555 | ipt_acc_tables[info->table_nr].ip, |
| 556 | ipt_acc_tables[info->table_nr].netmask, |
| 557 | src_ip, dst_ip, size, &ipt_acc_tables[info->table_nr].itemcount); |
| 558 | spin_unlock_bh(&ipt_acc_lock); |
| 559 | return XT_CONTINUE; |
| 560 | } |
| 561 | |
| 562 | /* 16 bit network */ |
| 563 | if (ipt_acc_tables[info->table_nr].depth == 1) { |
| 564 | ipt_acc_depth1_insert( |
| 565 | (struct ipt_acc_mask_16 *)ipt_acc_tables[info->table_nr].data, |
| 566 | ipt_acc_tables[info->table_nr].ip, |
| 567 | ipt_acc_tables[info->table_nr].netmask, |
| 568 | src_ip, dst_ip, size, &ipt_acc_tables[info->table_nr].itemcount); |
| 569 | spin_unlock_bh(&ipt_acc_lock); |
| 570 | return XT_CONTINUE; |
| 571 | } |
| 572 | |
| 573 | /* 24 bit network */ |
| 574 | if (ipt_acc_tables[info->table_nr].depth == 2) { |
| 575 | ipt_acc_depth2_insert( |
| 576 | (struct ipt_acc_mask_8 *)ipt_acc_tables[info->table_nr].data, |
| 577 | ipt_acc_tables[info->table_nr].ip, |
| 578 | ipt_acc_tables[info->table_nr].netmask, |
| 579 | src_ip, dst_ip, size, &ipt_acc_tables[info->table_nr].itemcount); |
| 580 | spin_unlock_bh(&ipt_acc_lock); |
| 581 | return XT_CONTINUE; |
| 582 | } |
| 583 | |
| 584 | printk("ACCOUNT: ipt_acc_target: Unable to process packet. " |
| 585 | "Table id %u. IPs %pI4/%pI4\n", |
| 586 | info->table_nr, &src_ip, &dst_ip); |
| 587 | |
| 588 | spin_unlock_bh(&ipt_acc_lock); |
| 589 | return XT_CONTINUE; |
| 590 | } |
| 591 | |
| 592 | /* |
| 593 | Functions dealing with "handles": |
| 594 | Handles are snapshots of a accounting state. |
| 595 | |
| 596 | read snapshots are only for debugging the code |
| 597 | and are very expensive concerning speed/memory |
| 598 | compared to read_and_flush. |
| 599 | |
| 600 | The functions aren't protected by spinlocks themselves |
| 601 | as this is done in the ioctl part of the code. |
| 602 | */ |
| 603 | |
| 604 | /* |
| 605 | Find a free handle slot. Normally only one should be used, |
| 606 | but there could be two or more applications accessing the data |
| 607 | at the same time. |
| 608 | */ |
| 609 | static int ipt_acc_handle_find_slot(void) |
| 610 | { |
| 611 | unsigned int i; |
| 612 | /* Insert new table */ |
| 613 | for (i = 0; i < ACCOUNT_MAX_HANDLES; i++) { |
| 614 | /* Found free slot */ |
| 615 | if (ipt_acc_handles[i].data == NULL) { |
| 616 | /* Don't "mark" data as used as we are protected by a spinlock |
| 617 | by the calling function. handle_find_slot() is only a function |
| 618 | to prevent code duplication. */ |
| 619 | return i; |
| 620 | } |
| 621 | } |
| 622 | |
| 623 | /* No free slot found */ |
| 624 | printk("ACCOUNT: No free handle slot found (max: %u). " |
| 625 | "Please increase ACCOUNT_MAX_HANDLES.\n", ACCOUNT_MAX_HANDLES); |
| 626 | return -1; |
| 627 | } |
| 628 | |
| 629 | static int ipt_acc_handle_free(unsigned int handle) |
| 630 | { |
| 631 | if (handle >= ACCOUNT_MAX_HANDLES) { |
| 632 | printk("ACCOUNT: Invalid handle for ipt_acc_handle_free() specified:" |
| 633 | " %u\n", handle); |
| 634 | return -EINVAL; |
| 635 | } |
| 636 | |
| 637 | ipt_acc_data_free(ipt_acc_handles[handle].data, |
| 638 | ipt_acc_handles[handle].depth); |
| 639 | memset (&ipt_acc_handles[handle], 0, sizeof (struct ipt_acc_handle)); |
| 640 | return 0; |
| 641 | } |
| 642 | |
| 643 | /* Prepare data for read without flush. Use only for debugging! |
| 644 | Real applications should use read&flush as it's way more efficent */ |
| 645 | static int ipt_acc_handle_prepare_read(char *tablename, |
| 646 | struct ipt_acc_handle *dest, u_int32_t *count) |
| 647 | { |
| 648 | int table_nr=-1; |
| 649 | unsigned char depth; |
| 650 | |
| 651 | for (table_nr = 0; table_nr < ACCOUNT_MAX_TABLES; table_nr++) |
| 652 | if (strncmp(ipt_acc_tables[table_nr].name, tablename, |
| 653 | ACCOUNT_TABLE_NAME_LEN) == 0) |
| 654 | break; |
| 655 | |
| 656 | if (table_nr == ACCOUNT_MAX_TABLES) { |
| 657 | printk("ACCOUNT: ipt_acc_handle_prepare_read(): " |
| 658 | "Table %s not found\n", tablename); |
| 659 | return -1; |
| 660 | } |
| 661 | |
| 662 | /* Fill up handle structure */ |
| 663 | dest->ip = ipt_acc_tables[table_nr].ip; |
| 664 | dest->depth = ipt_acc_tables[table_nr].depth; |
| 665 | dest->itemcount = ipt_acc_tables[table_nr].itemcount; |
| 666 | |
| 667 | /* allocate "root" table */ |
| 668 | if ((dest->data = ipt_acc_zalloc_page()) == NULL) { |
| 669 | printk("ACCOUNT: out of memory for root table " |
| 670 | "in ipt_acc_handle_prepare_read()\n"); |
| 671 | return -1; |
| 672 | } |
| 673 | |
| 674 | /* Recursive copy of complete data structure */ |
| 675 | depth = dest->depth; |
| 676 | if (depth == 0) { |
| 677 | memcpy(dest->data, |
| 678 | ipt_acc_tables[table_nr].data, |
| 679 | sizeof(struct ipt_acc_mask_24)); |
| 680 | } else if (depth == 1) { |
| 681 | struct ipt_acc_mask_16 *src_16 = |
| 682 | (struct ipt_acc_mask_16 *)ipt_acc_tables[table_nr].data; |
| 683 | struct ipt_acc_mask_16 *network_16 = |
| 684 | (struct ipt_acc_mask_16 *)dest->data; |
| 685 | unsigned int b; |
| 686 | |
| 687 | for (b = 0; b <= 255; b++) { |
| 688 | if (src_16->mask_24[b]) { |
| 689 | if ((network_16->mask_24[b] = |
| 690 | ipt_acc_zalloc_page()) == NULL) { |
| 691 | printk("ACCOUNT: out of memory during copy of 16 bit " |
| 692 | "network in ipt_acc_handle_prepare_read()\n"); |
| 693 | ipt_acc_data_free(dest->data, depth); |
| 694 | return -1; |
| 695 | } |
| 696 | |
| 697 | memcpy(network_16->mask_24[b], src_16->mask_24[b], |
| 698 | sizeof(struct ipt_acc_mask_24)); |
| 699 | } |
| 700 | } |
| 701 | } else if(depth == 2) { |
| 702 | struct ipt_acc_mask_8 *src_8 = |
| 703 | (struct ipt_acc_mask_8 *)ipt_acc_tables[table_nr].data; |
| 704 | struct ipt_acc_mask_8 *network_8 = |
| 705 | (struct ipt_acc_mask_8 *)dest->data; |
| 706 | struct ipt_acc_mask_16 *src_16, *network_16; |
| 707 | unsigned int a, b; |
| 708 | |
| 709 | for (a = 0; a <= 255; a++) { |
| 710 | if (src_8->mask_16[a]) { |
| 711 | if ((network_8->mask_16[a] = |
| 712 | ipt_acc_zalloc_page()) == NULL) { |
| 713 | printk("ACCOUNT: out of memory during copy of 24 bit network" |
| 714 | " in ipt_acc_handle_prepare_read()\n"); |
| 715 | ipt_acc_data_free(dest->data, depth); |
| 716 | return -1; |
| 717 | } |
| 718 | |
| 719 | memcpy(network_8->mask_16[a], src_8->mask_16[a], |
| 720 | sizeof(struct ipt_acc_mask_16)); |
| 721 | |
| 722 | src_16 = src_8->mask_16[a]; |
| 723 | network_16 = network_8->mask_16[a]; |
| 724 | |
| 725 | for (b = 0; b <= 255; b++) { |
| 726 | if (src_16->mask_24[b]) { |
| 727 | if ((network_16->mask_24[b] = |
| 728 | ipt_acc_zalloc_page()) == NULL) { |
| 729 | printk("ACCOUNT: out of memory during copy of 16 bit" |
| 730 | " network in ipt_acc_handle_prepare_read()\n"); |
| 731 | ipt_acc_data_free(dest->data, depth); |
| 732 | return -1; |
| 733 | } |
| 734 | |
| 735 | memcpy(network_16->mask_24[b], src_16->mask_24[b], |
| 736 | sizeof(struct ipt_acc_mask_24)); |
| 737 | } |
| 738 | } |
| 739 | } |
| 740 | } |
| 741 | } |
| 742 | |
| 743 | *count = ipt_acc_tables[table_nr].itemcount; |
| 744 | |
| 745 | return 0; |
| 746 | } |
| 747 | |
| 748 | /* Prepare data for read and flush it */ |
| 749 | static int ipt_acc_handle_prepare_read_flush(char *tablename, |
| 750 | struct ipt_acc_handle *dest, u_int32_t *count) |
| 751 | { |
| 752 | int table_nr; |
| 753 | void *new_data_page; |
| 754 | |
| 755 | for (table_nr = 0; table_nr < ACCOUNT_MAX_TABLES; table_nr++) |
| 756 | if (strncmp(ipt_acc_tables[table_nr].name, tablename, |
| 757 | ACCOUNT_TABLE_NAME_LEN) == 0) |
| 758 | break; |
| 759 | |
| 760 | if (table_nr == ACCOUNT_MAX_TABLES) { |
| 761 | printk("ACCOUNT: ipt_acc_handle_prepare_read_flush(): " |
| 762 | "Table %s not found\n", tablename); |
| 763 | return -1; |
| 764 | } |
| 765 | |
| 766 | /* Try to allocate memory */ |
| 767 | if (!(new_data_page = ipt_acc_zalloc_page())) { |
| 768 | printk("ACCOUNT: ipt_acc_handle_prepare_read_flush(): " |
| 769 | "Out of memory!\n"); |
| 770 | return -1; |
| 771 | } |
| 772 | |
| 773 | /* Fill up handle structure */ |
| 774 | dest->ip = ipt_acc_tables[table_nr].ip; |
| 775 | dest->depth = ipt_acc_tables[table_nr].depth; |
| 776 | dest->itemcount = ipt_acc_tables[table_nr].itemcount; |
| 777 | dest->data = ipt_acc_tables[table_nr].data; |
| 778 | *count = ipt_acc_tables[table_nr].itemcount; |
| 779 | |
| 780 | /* "Flush" table data */ |
| 781 | ipt_acc_tables[table_nr].data = new_data_page; |
| 782 | ipt_acc_tables[table_nr].itemcount = 0; |
| 783 | |
| 784 | return 0; |
| 785 | } |
| 786 | |
| 787 | /* Copy 8 bit network data into a prepared buffer. |
| 788 | We only copy entries != 0 to increase performance. |
| 789 | */ |
| 790 | static int ipt_acc_handle_copy_data(void *to_user, unsigned long *to_user_pos, |
| 791 | unsigned long *tmpbuf_pos, |
| 792 | struct ipt_acc_mask_24 *data, |
| 793 | u_int32_t net_ip, u_int32_t net_OR_mask) |
| 794 | { |
| 795 | struct ipt_acc_handle_ip handle_ip; |
| 796 | size_t handle_ip_size = sizeof (struct ipt_acc_handle_ip); |
| 797 | unsigned int i; |
| 798 | |
| 799 | for (i = 0; i <= 255; i++) { |
| 800 | if (data->ip[i].src_packets || data->ip[i].dst_packets) { |
| 801 | handle_ip.ip = net_ip | net_OR_mask | (i<<24); |
| 802 | |
| 803 | handle_ip.src_packets = data->ip[i].src_packets; |
| 804 | handle_ip.src_bytes = data->ip[i].src_bytes; |
| 805 | handle_ip.dst_packets = data->ip[i].dst_packets; |
| 806 | handle_ip.dst_bytes = data->ip[i].dst_bytes; |
| 807 | |
| 808 | /* Temporary buffer full? Flush to userspace */ |
| 809 | if (*tmpbuf_pos+handle_ip_size >= PAGE_SIZE) { |
| 810 | if (copy_to_user(to_user + *to_user_pos, ipt_acc_tmpbuf, |
| 811 | *tmpbuf_pos)) |
| 812 | return -EFAULT; |
| 813 | *to_user_pos = *to_user_pos + *tmpbuf_pos; |
| 814 | *tmpbuf_pos = 0; |
| 815 | } |
| 816 | memcpy(ipt_acc_tmpbuf+*tmpbuf_pos, &handle_ip, handle_ip_size); |
| 817 | *tmpbuf_pos += handle_ip_size; |
| 818 | } |
| 819 | } |
| 820 | |
| 821 | return 0; |
| 822 | } |
| 823 | |
| 824 | /* Copy the data from our internal structure |
| 825 | We only copy entries != 0 to increase performance. |
| 826 | Overwrites ipt_acc_tmpbuf. |
| 827 | */ |
| 828 | static int ipt_acc_handle_get_data(u_int32_t handle, void *to_user) |
| 829 | { |
| 830 | unsigned long to_user_pos=0, tmpbuf_pos=0; |
| 831 | u_int32_t net_ip; |
| 832 | unsigned char depth; |
| 833 | |
| 834 | if (handle >= ACCOUNT_MAX_HANDLES) { |
| 835 | printk("ACCOUNT: invalid handle for ipt_acc_handle_get_data() " |
| 836 | "specified: %u\n", handle); |
| 837 | return -1; |
| 838 | } |
| 839 | |
| 840 | if (ipt_acc_handles[handle].data == NULL) { |
| 841 | printk("ACCOUNT: handle %u is BROKEN: Contains no data\n", handle); |
| 842 | return -1; |
| 843 | } |
| 844 | |
| 845 | net_ip = ipt_acc_handles[handle].ip; |
| 846 | depth = ipt_acc_handles[handle].depth; |
| 847 | |
| 848 | /* 8 bit network */ |
| 849 | if (depth == 0) { |
| 850 | struct ipt_acc_mask_24 *network = |
| 851 | (struct ipt_acc_mask_24*)ipt_acc_handles[handle].data; |
| 852 | if (ipt_acc_handle_copy_data(to_user, &to_user_pos, &tmpbuf_pos, |
| 853 | network, net_ip, 0)) |
| 854 | return -1; |
| 855 | |
| 856 | /* Flush remaining data to userspace */ |
| 857 | if (tmpbuf_pos) |
| 858 | if (copy_to_user(to_user+to_user_pos, ipt_acc_tmpbuf, tmpbuf_pos)) |
| 859 | return -1; |
| 860 | |
| 861 | return 0; |
| 862 | } |
| 863 | |
| 864 | /* 16 bit network */ |
| 865 | if (depth == 1) { |
| 866 | struct ipt_acc_mask_16 *network_16 = |
| 867 | (struct ipt_acc_mask_16*)ipt_acc_handles[handle].data; |
| 868 | unsigned int b; |
| 869 | for (b = 0; b <= 255; b++) { |
| 870 | if (network_16->mask_24[b]) { |
| 871 | struct ipt_acc_mask_24 *network = |
| 872 | (struct ipt_acc_mask_24*)network_16->mask_24[b]; |
| 873 | if (ipt_acc_handle_copy_data(to_user, &to_user_pos, |
| 874 | &tmpbuf_pos, network, net_ip, (b << 16))) |
| 875 | return -1; |
| 876 | } |
| 877 | } |
| 878 | |
| 879 | /* Flush remaining data to userspace */ |
| 880 | if (tmpbuf_pos) |
| 881 | if (copy_to_user(to_user+to_user_pos, ipt_acc_tmpbuf, tmpbuf_pos)) |
| 882 | return -1; |
| 883 | |
| 884 | return 0; |
| 885 | } |
| 886 | |
| 887 | /* 24 bit network */ |
| 888 | if (depth == 2) { |
| 889 | struct ipt_acc_mask_8 *network_8 = |
| 890 | (struct ipt_acc_mask_8*)ipt_acc_handles[handle].data; |
| 891 | unsigned int a, b; |
| 892 | for (a = 0; a <= 255; a++) { |
| 893 | if (network_8->mask_16[a]) { |
| 894 | struct ipt_acc_mask_16 *network_16 = |
| 895 | (struct ipt_acc_mask_16*)network_8->mask_16[a]; |
| 896 | for (b = 0; b <= 255; b++) { |
| 897 | if (network_16->mask_24[b]) { |
| 898 | struct ipt_acc_mask_24 *network = |
| 899 | (struct ipt_acc_mask_24*)network_16->mask_24[b]; |
| 900 | if (ipt_acc_handle_copy_data(to_user, |
| 901 | &to_user_pos, &tmpbuf_pos, |
| 902 | network, net_ip, (a << 8) | (b << 16))) |
| 903 | return -1; |
| 904 | } |
| 905 | } |
| 906 | } |
| 907 | } |
| 908 | |
| 909 | /* Flush remaining data to userspace */ |
| 910 | if (tmpbuf_pos) |
| 911 | if (copy_to_user(to_user+to_user_pos, ipt_acc_tmpbuf, tmpbuf_pos)) |
| 912 | return -1; |
| 913 | |
| 914 | return 0; |
| 915 | } |
| 916 | |
| 917 | return -1; |
| 918 | } |
| 919 | |
| 920 | static int ipt_acc_set_ctl(struct sock *sk, int cmd, |
| 921 | void *user, unsigned int len) |
| 922 | { |
| 923 | struct ipt_acc_handle_sockopt handle; |
| 924 | int ret = -EINVAL; |
| 925 | |
| 926 | if (!capable(CAP_NET_ADMIN)) |
| 927 | return -EPERM; |
| 928 | |
| 929 | switch (cmd) { |
| 930 | case IPT_SO_SET_ACCOUNT_HANDLE_FREE: |
| 931 | if (len != sizeof(struct ipt_acc_handle_sockopt)) { |
| 932 | printk("ACCOUNT: ipt_acc_set_ctl: wrong data size (%u != %zu) " |
| 933 | "for IPT_SO_SET_HANDLE_FREE\n", |
| 934 | len, sizeof(struct ipt_acc_handle_sockopt)); |
| 935 | break; |
| 936 | } |
| 937 | |
| 938 | if (copy_from_user (&handle, user, len)) { |
| 939 | printk("ACCOUNT: ipt_acc_set_ctl: copy_from_user failed for " |
| 940 | "IPT_SO_SET_HANDLE_FREE\n"); |
| 941 | break; |
| 942 | } |
| 943 | |
| 944 | down(&ipt_acc_userspace_mutex); |
| 945 | ret = ipt_acc_handle_free(handle.handle_nr); |
| 946 | up(&ipt_acc_userspace_mutex); |
| 947 | break; |
| 948 | case IPT_SO_SET_ACCOUNT_HANDLE_FREE_ALL: { |
| 949 | unsigned int i; |
| 950 | down(&ipt_acc_userspace_mutex); |
| 951 | for (i = 0; i < ACCOUNT_MAX_HANDLES; i++) |
| 952 | ipt_acc_handle_free(i); |
| 953 | up(&ipt_acc_userspace_mutex); |
| 954 | ret = 0; |
| 955 | break; |
| 956 | } |
| 957 | default: |
| 958 | printk("ACCOUNT: ipt_acc_set_ctl: unknown request %i\n", cmd); |
| 959 | } |
| 960 | |
| 961 | return ret; |
| 962 | } |
| 963 | |
| 964 | static int ipt_acc_get_ctl(struct sock *sk, int cmd, void *user, int *len) |
| 965 | { |
| 966 | struct ipt_acc_handle_sockopt handle; |
| 967 | int ret = -EINVAL; |
| 968 | |
| 969 | if (!capable(CAP_NET_ADMIN)) |
| 970 | return -EPERM; |
| 971 | |
| 972 | switch (cmd) { |
| 973 | case IPT_SO_GET_ACCOUNT_PREPARE_READ_FLUSH: |
| 974 | case IPT_SO_GET_ACCOUNT_PREPARE_READ: { |
| 975 | struct ipt_acc_handle dest; |
| 976 | |
| 977 | if (*len < sizeof(struct ipt_acc_handle_sockopt)) { |
| 978 | printk("ACCOUNT: ipt_acc_get_ctl: wrong data size (%u != %zu) " |
| 979 | "for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n", |
| 980 | *len, sizeof(struct ipt_acc_handle_sockopt)); |
| 981 | break; |
| 982 | } |
| 983 | |
| 984 | if (copy_from_user (&handle, user, |
| 985 | sizeof(struct ipt_acc_handle_sockopt))) { |
| 986 | return -EFAULT; |
| 987 | break; |
| 988 | } |
| 989 | |
| 990 | spin_lock_bh(&ipt_acc_lock); |
| 991 | if (cmd == IPT_SO_GET_ACCOUNT_PREPARE_READ_FLUSH) |
| 992 | ret = ipt_acc_handle_prepare_read_flush( |
| 993 | handle.name, &dest, &handle.itemcount); |
| 994 | else |
| 995 | ret = ipt_acc_handle_prepare_read( |
| 996 | handle.name, &dest, &handle.itemcount); |
| 997 | spin_unlock_bh(&ipt_acc_lock); |
| 998 | // Error occured during prepare_read? |
| 999 | if (ret == -1) |
| 1000 | return -EINVAL; |
| 1001 | |
| 1002 | /* Allocate a userspace handle */ |
| 1003 | down(&ipt_acc_userspace_mutex); |
| 1004 | if ((handle.handle_nr = ipt_acc_handle_find_slot()) == -1) { |
| 1005 | ipt_acc_data_free(dest.data, dest.depth); |
| 1006 | up(&ipt_acc_userspace_mutex); |
| 1007 | return -EINVAL; |
| 1008 | } |
| 1009 | memcpy(&ipt_acc_handles[handle.handle_nr], &dest, |
| 1010 | sizeof(struct ipt_acc_handle)); |
| 1011 | up(&ipt_acc_userspace_mutex); |
| 1012 | |
| 1013 | if (copy_to_user(user, &handle, |
| 1014 | sizeof(struct ipt_acc_handle_sockopt))) { |
| 1015 | return -EFAULT; |
| 1016 | break; |
| 1017 | } |
| 1018 | ret = 0; |
| 1019 | break; |
| 1020 | } |
| 1021 | case IPT_SO_GET_ACCOUNT_GET_DATA: |
| 1022 | if (*len < sizeof(struct ipt_acc_handle_sockopt)) { |
| 1023 | printk("ACCOUNT: ipt_acc_get_ctl: wrong data size (%u != %zu)" |
| 1024 | " for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n", |
| 1025 | *len, sizeof(struct ipt_acc_handle_sockopt)); |
| 1026 | break; |
| 1027 | } |
| 1028 | |
| 1029 | if (copy_from_user (&handle, user, |
| 1030 | sizeof(struct ipt_acc_handle_sockopt))) { |
| 1031 | return -EFAULT; |
| 1032 | break; |
| 1033 | } |
| 1034 | |
| 1035 | if (handle.handle_nr >= ACCOUNT_MAX_HANDLES) { |
| 1036 | return -EINVAL; |
| 1037 | break; |
| 1038 | } |
| 1039 | |
| 1040 | if (*len < ipt_acc_handles[handle.handle_nr].itemcount |
| 1041 | * sizeof(struct ipt_acc_handle_ip)) { |
| 1042 | printk("ACCOUNT: ipt_acc_get_ctl: not enough space (%u < %zu)" |
| 1043 | " to store data from IPT_SO_GET_ACCOUNT_GET_DATA\n", |
| 1044 | *len, ipt_acc_handles[handle.handle_nr].itemcount |
| 1045 | * sizeof(struct ipt_acc_handle_ip)); |
| 1046 | ret = -ENOMEM; |
| 1047 | break; |
| 1048 | } |
| 1049 | |
| 1050 | down(&ipt_acc_userspace_mutex); |
| 1051 | ret = ipt_acc_handle_get_data(handle.handle_nr, user); |
| 1052 | up(&ipt_acc_userspace_mutex); |
| 1053 | if (ret) { |
| 1054 | printk("ACCOUNT: ipt_acc_get_ctl: ipt_acc_handle_get_data" |
| 1055 | " failed for handle %u\n", handle.handle_nr); |
| 1056 | break; |
| 1057 | } |
| 1058 | |
| 1059 | ret = 0; |
| 1060 | break; |
| 1061 | case IPT_SO_GET_ACCOUNT_GET_HANDLE_USAGE: { |
| 1062 | unsigned int i; |
| 1063 | if (*len < sizeof(struct ipt_acc_handle_sockopt)) { |
| 1064 | printk("ACCOUNT: ipt_acc_get_ctl: wrong data size (%u != %zu)" |
| 1065 | " for IPT_SO_GET_ACCOUNT_GET_HANDLE_USAGE\n", |
| 1066 | *len, sizeof(struct ipt_acc_handle_sockopt)); |
| 1067 | break; |
| 1068 | } |
| 1069 | |
| 1070 | /* Find out how many handles are in use */ |
| 1071 | handle.itemcount = 0; |
| 1072 | down(&ipt_acc_userspace_mutex); |
| 1073 | for (i = 0; i < ACCOUNT_MAX_HANDLES; i++) |
| 1074 | if (ipt_acc_handles[i].data) |
| 1075 | handle.itemcount++; |
| 1076 | up(&ipt_acc_userspace_mutex); |
| 1077 | |
| 1078 | if (copy_to_user(user, &handle, |
| 1079 | sizeof(struct ipt_acc_handle_sockopt))) { |
| 1080 | return -EFAULT; |
| 1081 | break; |
| 1082 | } |
| 1083 | ret = 0; |
| 1084 | break; |
| 1085 | } |
| 1086 | case IPT_SO_GET_ACCOUNT_GET_TABLE_NAMES: { |
| 1087 | u_int32_t size = 0, i, name_len; |
| 1088 | char *tnames; |
| 1089 | |
| 1090 | spin_lock_bh(&ipt_acc_lock); |
| 1091 | |
| 1092 | /* Determine size of table names */ |
| 1093 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) { |
| 1094 | if (ipt_acc_tables[i].name[0] != 0) |
| 1095 | size += strlen (ipt_acc_tables[i].name) + 1; |
| 1096 | } |
| 1097 | size += 1; /* Terminating NULL character */ |
| 1098 | |
| 1099 | if (*len < size || size > PAGE_SIZE) { |
| 1100 | spin_unlock_bh(&ipt_acc_lock); |
| 1101 | printk("ACCOUNT: ipt_acc_get_ctl: not enough space (%u < %u < %lu)" |
| 1102 | " to store table names\n", *len, size, PAGE_SIZE); |
| 1103 | ret = -ENOMEM; |
| 1104 | break; |
| 1105 | } |
| 1106 | /* Copy table names to userspace */ |
| 1107 | tnames = ipt_acc_tmpbuf; |
| 1108 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) { |
| 1109 | if (ipt_acc_tables[i].name[0] != 0) { |
| 1110 | name_len = strlen (ipt_acc_tables[i].name) + 1; |
| 1111 | memcpy(tnames, ipt_acc_tables[i].name, name_len); |
| 1112 | tnames += name_len; |
| 1113 | } |
| 1114 | } |
| 1115 | spin_unlock_bh(&ipt_acc_lock); |
| 1116 | |
| 1117 | /* Terminating NULL character */ |
| 1118 | *tnames = 0; |
| 1119 | |
| 1120 | /* Transfer to userspace */ |
| 1121 | if (copy_to_user(user, ipt_acc_tmpbuf, size)) |
| 1122 | return -EFAULT; |
| 1123 | |
| 1124 | ret = 0; |
| 1125 | break; |
| 1126 | } |
| 1127 | default: |
| 1128 | printk("ACCOUNT: ipt_acc_get_ctl: unknown request %i\n", cmd); |
| 1129 | } |
| 1130 | |
| 1131 | return ret; |
| 1132 | } |
| 1133 | |
| 1134 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,21) |
| 1135 | static struct xt_target xt_acc_reg = { |
| 1136 | #else |
| 1137 | static struct ipt_target ipt_acc_reg = { |
| 1138 | #endif |
| 1139 | .name = "ACCOUNT", |
| 1140 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,21) |
| 1141 | .family = AF_INET, |
| 1142 | #endif |
| 1143 | .target = ipt_acc_target, |
| 1144 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,17) |
| 1145 | .targetsize = sizeof(struct ipt_acc_info), |
| 1146 | #endif |
| 1147 | .checkentry = ipt_acc_checkentry, |
| 1148 | .destroy = ipt_acc_destroy, |
| 1149 | .me = THIS_MODULE |
| 1150 | }; |
| 1151 | |
| 1152 | static struct nf_sockopt_ops ipt_acc_sockopts = { |
| 1153 | .pf = PF_INET, |
| 1154 | .set_optmin = IPT_SO_SET_ACCOUNT_HANDLE_FREE, |
| 1155 | .set_optmax = IPT_SO_SET_ACCOUNT_MAX+1, |
| 1156 | .set = ipt_acc_set_ctl, |
| 1157 | .get_optmin = IPT_SO_GET_ACCOUNT_PREPARE_READ, |
| 1158 | .get_optmax = IPT_SO_GET_ACCOUNT_MAX+1, |
| 1159 | .get = ipt_acc_get_ctl |
| 1160 | }; |
| 1161 | |
| 1162 | static int __init init(void) |
| 1163 | { |
| 1164 | sema_init(&ipt_acc_userspace_mutex, 1); |
| 1165 | |
| 1166 | if ((ipt_acc_tables = |
| 1167 | kmalloc(ACCOUNT_MAX_TABLES * |
| 1168 | sizeof(struct ipt_acc_table), GFP_KERNEL)) == NULL) { |
| 1169 | printk("ACCOUNT: Out of memory allocating account_tables structure"); |
| 1170 | goto error_cleanup; |
| 1171 | } |
| 1172 | memset(ipt_acc_tables, 0, |
| 1173 | ACCOUNT_MAX_TABLES * sizeof(struct ipt_acc_table)); |
| 1174 | |
| 1175 | if ((ipt_acc_handles = |
| 1176 | kmalloc(ACCOUNT_MAX_HANDLES * |
| 1177 | sizeof(struct ipt_acc_handle), GFP_KERNEL)) == NULL) { |
| 1178 | printk("ACCOUNT: Out of memory allocating account_handles structure"); |
| 1179 | goto error_cleanup; |
| 1180 | } |
| 1181 | memset(ipt_acc_handles, 0, |
| 1182 | ACCOUNT_MAX_HANDLES * sizeof(struct ipt_acc_handle)); |
| 1183 | |
| 1184 | /* Allocate one page as temporary storage */ |
| 1185 | if ((ipt_acc_tmpbuf = (void*)__get_free_page(GFP_KERNEL)) == NULL) { |
| 1186 | printk("ACCOUNT: Out of memory for temporary buffer page\n"); |
| 1187 | goto error_cleanup; |
| 1188 | } |
| 1189 | |
| 1190 | /* Register setsockopt */ |
| 1191 | if (nf_register_sockopt(&ipt_acc_sockopts) < 0) { |
| 1192 | printk("ACCOUNT: Can't register sockopts. Aborting\n"); |
| 1193 | goto error_cleanup; |
| 1194 | } |
| 1195 | |
| 1196 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,21) |
| 1197 | if (xt_register_target(&xt_acc_reg)) |
| 1198 | #else |
| 1199 | if (ipt_register_target(&ipt_acc_reg)) |
| 1200 | #endif |
| 1201 | goto error_cleanup; |
| 1202 | |
| 1203 | return 0; |
| 1204 | |
| 1205 | error_cleanup: |
| 1206 | if(ipt_acc_tables) |
| 1207 | kfree(ipt_acc_tables); |
| 1208 | if(ipt_acc_handles) |
| 1209 | kfree(ipt_acc_handles); |
| 1210 | if (ipt_acc_tmpbuf) |
| 1211 | free_page((unsigned long)ipt_acc_tmpbuf); |
| 1212 | |
| 1213 | return -EINVAL; |
| 1214 | } |
| 1215 | |
| 1216 | static void __exit fini(void) |
| 1217 | { |
| 1218 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,21) |
| 1219 | xt_unregister_target(&xt_acc_reg); |
| 1220 | #else |
| 1221 | ipt_unregister_target(&ipt_acc_reg); |
| 1222 | #endif |
| 1223 | |
| 1224 | nf_unregister_sockopt(&ipt_acc_sockopts); |
| 1225 | |
| 1226 | kfree(ipt_acc_tables); |
| 1227 | kfree(ipt_acc_handles); |
| 1228 | free_page((unsigned long)ipt_acc_tmpbuf); |
| 1229 | } |
| 1230 | |
| 1231 | module_init(init); |
| 1232 | module_exit(fini); |
| 1233 | MODULE_LICENSE("GPL"); |