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54756114 TJ |
1 | /*************************************************************************** |
2 | * This is a module which is used for counting packets. * | |
116ea150 | 3 | * See http://www.intra2net.com/opensource/ipt_account * |
54756114 TJ |
4 | * for further information * |
5 | * * | |
6 | * Copyright (C) 2004 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 | ||
70288420 TJ |
15 | #include <linux/module.h> |
16 | #include <linux/skbuff.h> | |
17 | #include <linux/ip.h> | |
18 | #include <linux/spinlock.h> | |
19 | #include <net/icmp.h> | |
20 | #include <net/udp.h> | |
21 | #include <net/tcp.h> | |
22 | #include <linux/netfilter_ipv4/ip_tables.h> | |
6fe5ced9 TJ |
23 | #include <linux/kernel.h> |
24 | #include <linux/mm.h> | |
25 | #include <linux/string.h> | |
26 | #include <asm/uaccess.h> | |
70288420 TJ |
27 | |
28 | struct in_device; | |
29 | #include <net/route.h> | |
30 | #include <linux/netfilter_ipv4/ipt_ACCOUNT.h> | |
31 | ||
5b15c288 | 32 | #if 0 |
70288420 | 33 | #define DEBUGP printk |
5b15c288 TJ |
34 | #else |
35 | #define DEBUGP(format, args...) | |
36 | #endif | |
70288420 | 37 | |
ad773892 TJ |
38 | #if (PAGE_SIZE < 4096) |
39 | #error "ipt_ACCOUNT needs at least a PAGE_SIZE of 4096" | |
40 | #endif | |
41 | ||
6803acfc TJ |
42 | struct ipt_acc_table *ipt_acc_tables = NULL; |
43 | struct ipt_acc_handle *ipt_acc_handles = NULL; | |
44 | void *ipt_acc_tmpbuf = NULL; | |
70288420 | 45 | |
2ea7a43c | 46 | /* Spinlock used for manipulating the current accounting tables/data */ |
6803acfc | 47 | static spinlock_t ipt_acc_lock = SPIN_LOCK_UNLOCKED; |
2ea7a43c | 48 | /* Spinlock used for manipulating userspace handles/snapshot data */ |
6803acfc | 49 | static spinlock_t ipt_acc_userspace_lock = SPIN_LOCK_UNLOCKED; |
9c44d30e | 50 | |
70288420 | 51 | |
70288420 | 52 | /* Recursive free of all data structures */ |
6803acfc | 53 | void ipt_acc_data_free(void *data, unsigned char depth) |
e1b66101 | 54 | { |
2ea7a43c | 55 | /* Empty data set */ |
70288420 TJ |
56 | if (!data) |
57 | return; | |
2ea7a43c | 58 | |
06817fca | 59 | /* Free for 8 bit network */ |
2ea7a43c | 60 | if (depth == 0) { |
850cece6 | 61 | free_page((unsigned long)data); |
70288420 TJ |
62 | return; |
63 | } | |
2ea7a43c | 64 | |
06817fca | 65 | /* Free for 16 bit network */ |
2ea7a43c | 66 | if (depth == 1) { |
6803acfc | 67 | struct ipt_acc_mask_16 *mask_16 = (struct ipt_acc_mask_16 *)data; |
6fe5ced9 | 68 | u_int32_t b; |
2ea7a43c TJ |
69 | for (b=0; b <= 255; b++) { |
70 | if (mask_16->mask_24[b] != 0) { | |
850cece6 | 71 | free_page((unsigned long)mask_16->mask_24[b]); |
70288420 TJ |
72 | } |
73 | } | |
850cece6 | 74 | free_page((unsigned long)data); |
70288420 | 75 | return; |
2ea7a43c TJ |
76 | } |
77 | ||
06817fca | 78 | /* Free for 24 bit network */ |
497344b1 | 79 | if (depth == 2) { |
6fe5ced9 | 80 | u_int32_t a, b; |
2ea7a43c | 81 | for (a=0; a <= 255; a++) { |
6803acfc TJ |
82 | if (((struct ipt_acc_mask_8 *)data)->mask_16[a]) { |
83 | struct ipt_acc_mask_16 *mask_16 = (struct ipt_acc_mask_16*) | |
84 | ((struct ipt_acc_mask_8 *)data)->mask_16[a]; | |
e1b66101 | 85 | |
2ea7a43c | 86 | for (b=0; b <= 255; b++) { |
70288420 | 87 | if (mask_16->mask_24[b]) { |
850cece6 | 88 | free_page((unsigned long)mask_16->mask_24[b]); |
70288420 TJ |
89 | } |
90 | } | |
850cece6 | 91 | free_page((unsigned long)mask_16); |
70288420 TJ |
92 | } |
93 | } | |
850cece6 | 94 | free_page((unsigned long)data); |
70288420 TJ |
95 | return; |
96 | } | |
2ea7a43c | 97 | |
6803acfc | 98 | printk("ACCOUNT: ipt_acc_data_free called with unknown depth: %d\n", |
013fcc80 | 99 | depth); |
70288420 TJ |
100 | return; |
101 | } | |
102 | ||
013fcc80 GE |
103 | /* Look for existing table / insert new one. |
104 | Return internal ID or -1 on error */ | |
6fe5ced9 | 105 | int ipt_acc_table_insert(char *name, u_int32_t ip, u_int32_t netmask) |
e1b66101 | 106 | { |
6fe5ced9 | 107 | u_int32_t i; |
70288420 | 108 | |
6803acfc | 109 | DEBUGP("ACCOUNT: ipt_acc_table_insert: %s, %u.%u.%u.%u/%u.%u.%u.%u\n", |
e1b66101 | 110 | name, NIPQUAD(ip), NIPQUAD(netmask)); |
70288420 | 111 | |
06817fca | 112 | /* Look for existing table */ |
2ea7a43c | 113 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) { |
6803acfc | 114 | if (strncmp(ipt_acc_tables[i].name, name, |
013fcc80 GE |
115 | ACCOUNT_TABLE_NAME_LEN) == 0) { |
116 | DEBUGP("ACCOUNT: Found existing slot: %d - " | |
117 | "%u.%u.%u.%u/%u.%u.%u.%u\n", i, | |
6803acfc TJ |
118 | NIPQUAD(ipt_acc_tables[i].ip), |
119 | NIPQUAD(ipt_acc_tables[i].netmask)); | |
013fcc80 | 120 | |
6803acfc TJ |
121 | if (ipt_acc_tables[i].ip != ip |
122 | || ipt_acc_tables[i].netmask != netmask) { | |
013fcc80 GE |
123 | printk("ACCOUNT: Table %s found, but IP/netmask mismatch. " |
124 | "IP/netmask found: %u.%u.%u.%u/%u.%u.%u.%u\n", | |
6803acfc TJ |
125 | name, NIPQUAD(ipt_acc_tables[i].ip), |
126 | NIPQUAD(ipt_acc_tables[i].netmask)); | |
70288420 TJ |
127 | return -1; |
128 | } | |
129 | ||
6803acfc TJ |
130 | ipt_acc_tables[i].refcount++; |
131 | DEBUGP("ACCOUNT: Refcount: %d\n", ipt_acc_tables[i].refcount); | |
70288420 TJ |
132 | return i; |
133 | } | |
134 | } | |
135 | ||
06817fca | 136 | /* Insert new table */ |
2ea7a43c | 137 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) { |
06817fca | 138 | /* Found free slot */ |
6803acfc | 139 | if (ipt_acc_tables[i].name[0] == 0) { |
70288420 | 140 | DEBUGP("ACCOUNT: Found free slot: %d\n", i); |
2ea7a43c | 141 | |
6803acfc | 142 | strncpy (ipt_acc_tables[i].name, name, ACCOUNT_TABLE_NAME_LEN-1); |
2ea7a43c | 143 | |
6803acfc TJ |
144 | ipt_acc_tables[i].ip = ip; |
145 | ipt_acc_tables[i].netmask = netmask; | |
2ea7a43c | 146 | |
06817fca | 147 | /* Calculate netsize */ |
6fe5ced9 | 148 | u_int32_t j, calc_mask, netsize=0; |
70288420 | 149 | calc_mask = htonl(netmask); |
6fe5ced9 | 150 | for (j = 31; j >= 0; j--) { |
70288420 | 151 | if (calc_mask&(1<<j)) |
850cece6 | 152 | netsize++; |
70288420 TJ |
153 | else |
154 | break; | |
155 | } | |
2ea7a43c | 156 | |
06817fca | 157 | /* Calculate depth from netsize */ |
850cece6 | 158 | if (netsize >= 24) |
6803acfc | 159 | ipt_acc_tables[i].depth = 0; |
850cece6 | 160 | else if (netsize >= 16) |
6803acfc | 161 | ipt_acc_tables[i].depth = 1; |
850cece6 | 162 | else if(netsize >= 8) |
6803acfc | 163 | ipt_acc_tables[i].depth = 2; |
2ea7a43c | 164 | |
013fcc80 | 165 | DEBUGP("ACCOUNT: calculated netsize: %u -> " |
6803acfc TJ |
166 | "ipt_acc_table depth %u\n", netsize, |
167 | ipt_acc_tables[i].depth); | |
2ea7a43c | 168 | |
6803acfc TJ |
169 | ipt_acc_tables[i].refcount++; |
170 | if ((ipt_acc_tables[i].data | |
013fcc80 | 171 | = (void *)get_zeroed_page(GFP_ATOMIC)) == NULL) { |
850cece6 | 172 | printk("ACCOUNT: out of memory for data of table: %s\n", name); |
6803acfc TJ |
173 | memset(&ipt_acc_tables[i], 0, |
174 | sizeof(struct ipt_acc_table)); | |
70288420 TJ |
175 | return -1; |
176 | } | |
2ea7a43c | 177 | |
70288420 TJ |
178 | return i; |
179 | } | |
180 | } | |
2ea7a43c | 181 | |
06817fca | 182 | /* No free slot found */ |
013fcc80 GE |
183 | printk("ACCOUNT: No free table slot found (max: %d). " |
184 | "Please increase ACCOUNT_MAX_TABLES.\n", ACCOUNT_MAX_TABLES); | |
70288420 TJ |
185 | return -1; |
186 | } | |
187 | ||
6803acfc | 188 | static int ipt_acc_checkentry(const char *tablename, |
2ea7a43c TJ |
189 | const struct ipt_entry *e, |
190 | void *targinfo, | |
191 | unsigned int targinfosize, | |
e1b66101 TJ |
192 | unsigned int hook_mask) |
193 | { | |
6803acfc | 194 | struct ipt_acc_info *info = targinfo; |
2ea7a43c | 195 | |
6803acfc | 196 | if (targinfosize != IPT_ALIGN(sizeof(struct ipt_acc_info))) { |
70288420 | 197 | DEBUGP("ACCOUNT: targinfosize %u != %u\n", |
6803acfc | 198 | targinfosize, IPT_ALIGN(sizeof(struct ipt_acc_info))); |
70288420 TJ |
199 | return 0; |
200 | } | |
201 | ||
6803acfc TJ |
202 | spin_lock_bh(&ipt_acc_lock); |
203 | int table_nr = ipt_acc_table_insert(info->table_name, info->net_ip, | |
013fcc80 | 204 | info->net_mask); |
2ea7a43c | 205 | if (table_nr == -1) { |
70288420 | 206 | printk("ACCOUNT: Table insert problem. Aborting\n"); |
6803acfc | 207 | spin_unlock_bh(&ipt_acc_lock); |
70288420 TJ |
208 | return 0; |
209 | } | |
013fcc80 GE |
210 | /* Table nr caching so we don't have to do an extra string compare |
211 | for every packet */ | |
70288420 | 212 | info->table_nr = table_nr; |
2ea7a43c | 213 | |
6803acfc | 214 | spin_unlock_bh(&ipt_acc_lock); |
850cece6 | 215 | |
70288420 TJ |
216 | return 1; |
217 | } | |
218 | ||
6803acfc | 219 | void ipt_acc_deleteentry(void *targinfo, unsigned int targinfosize) |
e1b66101 | 220 | { |
6fe5ced9 | 221 | u_int32_t i; |
6803acfc | 222 | struct ipt_acc_info *info = targinfo; |
2ea7a43c | 223 | |
6803acfc | 224 | if (targinfosize != IPT_ALIGN(sizeof(struct ipt_acc_info))) { |
850cece6 | 225 | DEBUGP("ACCOUNT: targinfosize %u != %u\n", |
6803acfc | 226 | targinfosize, IPT_ALIGN(sizeof(struct ipt_acc_info))); |
850cece6 TJ |
227 | } |
228 | ||
6803acfc | 229 | spin_lock_bh(&ipt_acc_lock); |
2ea7a43c | 230 | |
6803acfc | 231 | DEBUGP("ACCOUNT: ipt_acc_deleteentry called for table: %s (#%d)\n", |
013fcc80 | 232 | info->table_name, info->table_nr); |
2ea7a43c | 233 | |
06817fca | 234 | info->table_nr = -1; /* Set back to original state */ |
2ea7a43c | 235 | |
06817fca | 236 | /* Look for table */ |
2ea7a43c | 237 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) { |
6803acfc | 238 | if (strncmp(ipt_acc_tables[i].name, info->table_name, |
013fcc80 | 239 | ACCOUNT_TABLE_NAME_LEN) == 0) { |
850cece6 | 240 | DEBUGP("ACCOUNT: Found table at slot: %d\n", i); |
2ea7a43c | 241 | |
6803acfc | 242 | ipt_acc_tables[i].refcount--; |
013fcc80 | 243 | DEBUGP("ACCOUNT: Refcount left: %d\n", |
6803acfc | 244 | ipt_acc_tables[i].refcount); |
850cece6 | 245 | |
06817fca | 246 | /* Table not needed anymore? */ |
6803acfc | 247 | if (ipt_acc_tables[i].refcount == 0) { |
850cece6 | 248 | DEBUGP("ACCOUNT: Destroying table at slot: %d\n", i); |
6803acfc TJ |
249 | ipt_acc_data_free(ipt_acc_tables[i].data, |
250 | ipt_acc_tables[i].depth); | |
251 | memset(&ipt_acc_tables[i], 0, | |
252 | sizeof(struct ipt_acc_table)); | |
850cece6 | 253 | } |
2ea7a43c | 254 | |
6803acfc | 255 | spin_unlock_bh(&ipt_acc_lock); |
850cece6 TJ |
256 | return; |
257 | } | |
258 | } | |
259 | ||
06817fca | 260 | /* Table not found */ |
850cece6 | 261 | printk("ACCOUNT: Table %s not found for destroy\n", info->table_name); |
6803acfc | 262 | spin_unlock_bh(&ipt_acc_lock); |
850cece6 TJ |
263 | } |
264 | ||
6803acfc | 265 | void ipt_acc_depth0_insert(struct ipt_acc_mask_24 *mask_24, |
6fe5ced9 TJ |
266 | u_int32_t net_ip, u_int32_t netmask, |
267 | u_int32_t src_ip, u_int32_t dst_ip, | |
268 | u_int32_t size, u_int32_t *itemcount) | |
e1b66101 | 269 | { |
4068e14d | 270 | unsigned char is_src = 0, is_dst = 0; |
2ea7a43c | 271 | |
6803acfc | 272 | DEBUGP("ACCOUNT: ipt_acc_depth0_insert: %u.%u.%u.%u/%u.%u.%u.%u " |
013fcc80 GE |
273 | "for net %u.%u.%u.%u/%u.%u.%u.%u, size: %u\n", NIPQUAD(src_ip), |
274 | NIPQUAD(dst_ip), NIPQUAD(net_ip), NIPQUAD(netmask), size); | |
2ea7a43c | 275 | |
06817fca TJ |
276 | /* Check if src/dst is inside our network. */ |
277 | /* Special: net_ip = 0.0.0.0/0 gets stored as src in slot 0 */ | |
4068e14d TJ |
278 | if (!netmask) |
279 | src_ip = 0; | |
280 | if ((net_ip&netmask) == (src_ip&netmask)) | |
281 | is_src = 1; | |
282 | if ((net_ip&netmask) == (dst_ip&netmask) && netmask) | |
283 | is_dst = 1; | |
2ea7a43c TJ |
284 | |
285 | if (!is_src && !is_dst) { | |
013fcc80 GE |
286 | DEBUGP("ACCOUNT: Skipping packet %u.%u.%u.%u/%u.%u.%u.%u " |
287 | "for net %u.%u.%u.%u/%u.%u.%u.%u\n", NIPQUAD(src_ip), | |
288 | NIPQUAD(dst_ip), NIPQUAD(net_ip), NIPQUAD(netmask)); | |
4068e14d TJ |
289 | return; |
290 | } | |
2ea7a43c | 291 | |
06817fca | 292 | /* Check if this entry is new */ |
fa9124c2 | 293 | char is_src_new_ip = 0, is_dst_new_ip = 0; |
ff4ee64d | 294 | |
06817fca | 295 | /* Calculate array positions */ |
ff4ee64d TJ |
296 | unsigned char src_slot = (unsigned char)((src_ip&0xFF000000) >> 24); |
297 | unsigned char dst_slot = (unsigned char)((dst_ip&0xFF000000) >> 24); | |
2ea7a43c | 298 | |
06817fca | 299 | /* Increase size counters */ |
2ea7a43c | 300 | if (is_src) { |
06817fca | 301 | /* Calculate network slot */ |
5dbfa65d | 302 | DEBUGP("ACCOUNT: Calculated SRC 8 bit network slot: %d\n", src_slot); |
013fcc80 GE |
303 | if (!mask_24->ip[src_slot].src_packets |
304 | && !mask_24->ip[src_slot].dst_packets) | |
fa9124c2 | 305 | is_src_new_ip = 1; |
2ea7a43c | 306 | |
ff4ee64d TJ |
307 | mask_24->ip[src_slot].src_packets++; |
308 | mask_24->ip[src_slot].src_bytes+=size; | |
4068e14d | 309 | } |
2ea7a43c | 310 | if (is_dst) { |
5dbfa65d | 311 | DEBUGP("ACCOUNT: Calculated DST 8 bit network slot: %d\n", dst_slot); |
013fcc80 GE |
312 | if (!mask_24->ip[dst_slot].src_packets |
313 | && !mask_24->ip[dst_slot].dst_packets) | |
fa9124c2 | 314 | is_dst_new_ip = 1; |
2ea7a43c | 315 | |
ff4ee64d TJ |
316 | mask_24->ip[dst_slot].dst_packets++; |
317 | mask_24->ip[dst_slot].dst_bytes+=size; | |
4068e14d | 318 | } |
2ea7a43c | 319 | |
06817fca | 320 | /* Increase itemcounter */ |
4adc8355 | 321 | DEBUGP("ACCOUNT: Itemcounter before: %d\n", *itemcount); |
2ea7a43c | 322 | if (src_slot == dst_slot) { |
4adc8355 | 323 | if (is_src_new_ip || is_dst_new_ip) { |
013fcc80 GE |
324 | DEBUGP("ACCOUNT: src_slot == dst_slot: %d, %d\n", |
325 | is_src_new_ip, is_dst_new_ip); | |
fa9124c2 | 326 | (*itemcount)++; |
4adc8355 | 327 | } |
fa9124c2 | 328 | } else { |
4adc8355 TJ |
329 | if (is_src_new_ip) { |
330 | DEBUGP("ACCOUNT: New src_ip: %u.%u.%u.%u\n", NIPQUAD(src_ip)); | |
fa9124c2 | 331 | (*itemcount)++; |
4adc8355 TJ |
332 | } |
333 | if (is_dst_new_ip) { | |
334 | DEBUGP("ACCOUNT: New dst_ip: %u.%u.%u.%u\n", NIPQUAD(dst_ip)); | |
fa9124c2 | 335 | (*itemcount)++; |
4adc8355 | 336 | } |
fa9124c2 | 337 | } |
4adc8355 | 338 | DEBUGP("ACCOUNT: Itemcounter after: %d\n", *itemcount); |
4068e14d TJ |
339 | } |
340 | ||
6803acfc | 341 | void ipt_acc_depth1_insert(struct ipt_acc_mask_16 *mask_16, |
6fe5ced9 TJ |
342 | u_int32_t net_ip, u_int32_t netmask, |
343 | u_int32_t src_ip, u_int32_t dst_ip, | |
344 | u_int32_t size, u_int32_t *itemcount) | |
e1b66101 | 345 | { |
06817fca | 346 | /* Do we need to process src IP? */ |
2ea7a43c | 347 | if ((net_ip&netmask) == (src_ip&netmask)) { |
4068e14d TJ |
348 | unsigned char slot = (unsigned char)((src_ip&0x00FF0000) >> 16); |
349 | DEBUGP("ACCOUNT: Calculated SRC 16 bit network slot: %d\n", slot); | |
2ea7a43c | 350 | |
06817fca | 351 | /* Do we need to create a new mask_24 bucket? */ |
013fcc80 GE |
352 | if (!mask_16->mask_24[slot] && (mask_16->mask_24[slot] = |
353 | (void *)get_zeroed_page(GFP_ATOMIC)) == NULL) { | |
4068e14d TJ |
354 | printk("ACCOUNT: Can't process packet because out of memory!\n"); |
355 | return; | |
356 | } | |
2ea7a43c | 357 | |
6803acfc | 358 | ipt_acc_depth0_insert((struct ipt_acc_mask_24 *)mask_16->mask_24[slot], |
013fcc80 | 359 | net_ip, netmask, src_ip, 0, size, itemcount); |
4068e14d | 360 | } |
2ea7a43c | 361 | |
06817fca | 362 | /* Do we need to process dst IP? */ |
2ea7a43c | 363 | if ((net_ip&netmask) == (dst_ip&netmask)) { |
4068e14d TJ |
364 | unsigned char slot = (unsigned char)((dst_ip&0x00FF0000) >> 16); |
365 | DEBUGP("ACCOUNT: Calculated DST 16 bit network slot: %d\n", slot); | |
2ea7a43c | 366 | |
06817fca | 367 | /* Do we need to create a new mask_24 bucket? */ |
013fcc80 GE |
368 | if (!mask_16->mask_24[slot] && (mask_16->mask_24[slot] |
369 | = (void *)get_zeroed_page(GFP_ATOMIC)) == NULL) { | |
4068e14d TJ |
370 | printk("ACCOUT: Can't process packet because out of memory!\n"); |
371 | return; | |
372 | } | |
2ea7a43c | 373 | |
6803acfc | 374 | ipt_acc_depth0_insert((struct ipt_acc_mask_24 *)mask_16->mask_24[slot], |
013fcc80 | 375 | net_ip, netmask, 0, dst_ip, size, itemcount); |
4068e14d TJ |
376 | } |
377 | } | |
378 | ||
6803acfc | 379 | void ipt_acc_depth2_insert(struct ipt_acc_mask_8 *mask_8, |
6fe5ced9 TJ |
380 | u_int32_t net_ip, u_int32_t netmask, |
381 | u_int32_t src_ip, u_int32_t dst_ip, | |
382 | u_int32_t size, u_int32_t *itemcount) | |
e1b66101 | 383 | { |
06817fca | 384 | /* Do we need to process src IP? */ |
2ea7a43c | 385 | if ((net_ip&netmask) == (src_ip&netmask)) { |
4068e14d TJ |
386 | unsigned char slot = (unsigned char)((src_ip&0x0000FF00) >> 8); |
387 | DEBUGP("ACCOUNT: Calculated SRC 24 bit network slot: %d\n", slot); | |
2ea7a43c | 388 | |
06817fca | 389 | /* Do we need to create a new mask_24 bucket? */ |
013fcc80 GE |
390 | if (!mask_8->mask_16[slot] && (mask_8->mask_16[slot] |
391 | = (void *)get_zeroed_page(GFP_ATOMIC)) == NULL) { | |
4068e14d TJ |
392 | printk("ACCOUNT: Can't process packet because out of memory!\n"); |
393 | return; | |
394 | } | |
2ea7a43c | 395 | |
6803acfc | 396 | ipt_acc_depth1_insert((struct ipt_acc_mask_16 *)mask_8->mask_16[slot], |
013fcc80 | 397 | net_ip, netmask, src_ip, 0, size, itemcount); |
4068e14d | 398 | } |
2ea7a43c | 399 | |
06817fca | 400 | /* Do we need to process dst IP? */ |
2ea7a43c | 401 | if ((net_ip&netmask) == (dst_ip&netmask)) { |
4068e14d TJ |
402 | unsigned char slot = (unsigned char)((dst_ip&0x0000FF00) >> 8); |
403 | DEBUGP("ACCOUNT: Calculated DST 24 bit network slot: %d\n", slot); | |
2ea7a43c | 404 | |
06817fca | 405 | /* Do we need to create a new mask_24 bucket? */ |
013fcc80 GE |
406 | if (!mask_8->mask_16[slot] && (mask_8->mask_16[slot] |
407 | = (void *)get_zeroed_page(GFP_ATOMIC)) == NULL) { | |
4068e14d TJ |
408 | printk("ACCOUNT: Can't process packet because out of memory!\n"); |
409 | return; | |
410 | } | |
2ea7a43c | 411 | |
6803acfc | 412 | ipt_acc_depth1_insert((struct ipt_acc_mask_16 *)mask_8->mask_16[slot], |
013fcc80 | 413 | net_ip, netmask, 0, dst_ip, size, itemcount); |
4068e14d TJ |
414 | } |
415 | } | |
416 | ||
6803acfc | 417 | static unsigned int ipt_acc_target(struct sk_buff **pskb, |
2ea7a43c TJ |
418 | unsigned int hooknum, |
419 | const struct net_device *in, | |
420 | const struct net_device *out, | |
421 | const void *targinfo, | |
e1b66101 TJ |
422 | void *userinfo) |
423 | { | |
6803acfc TJ |
424 | const struct ipt_acc_info *info = |
425 | (const struct ipt_acc_info *)targinfo; | |
6fe5ced9 TJ |
426 | u_int32_t src_ip = (*pskb)->nh.iph->saddr; |
427 | u_int32_t dst_ip = (*pskb)->nh.iph->daddr; | |
428 | u_int32_t size = ntohs((*pskb)->nh.iph->tot_len); | |
2ea7a43c | 429 | |
6803acfc | 430 | spin_lock_bh(&ipt_acc_lock); |
2ea7a43c | 431 | |
6803acfc TJ |
432 | if (ipt_acc_tables[info->table_nr].name[0] == 0) { |
433 | printk("ACCOUNT: ipt_acc_target: Invalid table id %u. " | |
013fcc80 GE |
434 | "IPs %u.%u.%u.%u/%u.%u.%u.%u\n", info->table_nr, |
435 | NIPQUAD(src_ip), NIPQUAD(dst_ip)); | |
6803acfc | 436 | spin_unlock_bh(&ipt_acc_lock); |
4068e14d TJ |
437 | return IPT_CONTINUE; |
438 | } | |
2ea7a43c | 439 | |
06817fca | 440 | /* 8 bit network or "any" network */ |
6803acfc | 441 | if (ipt_acc_tables[info->table_nr].depth == 0) { |
06817fca | 442 | /* Count packet and check if the IP is new */ |
6803acfc TJ |
443 | ipt_acc_depth0_insert( |
444 | (struct ipt_acc_mask_24 *)ipt_acc_tables[info->table_nr].data, | |
445 | ipt_acc_tables[info->table_nr].ip, | |
446 | ipt_acc_tables[info->table_nr].netmask, | |
447 | src_ip, dst_ip, size, &ipt_acc_tables[info->table_nr].itemcount); | |
448 | spin_unlock_bh(&ipt_acc_lock); | |
4068e14d | 449 | return IPT_CONTINUE; |
2ea7a43c TJ |
450 | } |
451 | ||
06817fca | 452 | /* 16 bit network */ |
6803acfc TJ |
453 | if (ipt_acc_tables[info->table_nr].depth == 1) { |
454 | ipt_acc_depth1_insert( | |
455 | (struct ipt_acc_mask_16 *)ipt_acc_tables[info->table_nr].data, | |
456 | ipt_acc_tables[info->table_nr].ip, | |
457 | ipt_acc_tables[info->table_nr].netmask, | |
458 | src_ip, dst_ip, size, &ipt_acc_tables[info->table_nr].itemcount); | |
459 | spin_unlock_bh(&ipt_acc_lock); | |
4068e14d TJ |
460 | return IPT_CONTINUE; |
461 | } | |
2ea7a43c | 462 | |
06817fca | 463 | /* 24 bit network */ |
6803acfc TJ |
464 | if (ipt_acc_tables[info->table_nr].depth == 2) { |
465 | ipt_acc_depth2_insert( | |
466 | (struct ipt_acc_mask_8 *)ipt_acc_tables[info->table_nr].data, | |
467 | ipt_acc_tables[info->table_nr].ip, | |
468 | ipt_acc_tables[info->table_nr].netmask, | |
469 | src_ip, dst_ip, size, &ipt_acc_tables[info->table_nr].itemcount); | |
470 | spin_unlock_bh(&ipt_acc_lock); | |
4068e14d TJ |
471 | return IPT_CONTINUE; |
472 | } | |
2ea7a43c | 473 | |
6803acfc | 474 | printk("ACCOUNT: ipt_acc_target: Unable to process packet. " |
013fcc80 | 475 | "Table id %u. IPs %u.%u.%u.%u/%u.%u.%u.%u\n", |
2ea7a43c TJ |
476 | info->table_nr, NIPQUAD(src_ip), NIPQUAD(dst_ip)); |
477 | ||
6803acfc | 478 | spin_unlock_bh(&ipt_acc_lock); |
4068e14d TJ |
479 | return IPT_CONTINUE; |
480 | } | |
481 | ||
bea3921b TJ |
482 | /* |
483 | Functions dealing with "handles": | |
484 | Handles are snapshots of a accounting state. | |
485 | ||
486 | read snapshots are only for debugging the code | |
487 | and are very expensive concerning speed/memory | |
488 | compared to read_and_flush. | |
489 | ||
490 | The functions aren't protected by spinlocks themselves | |
491 | as this is done in the ioctl part of the code. | |
492 | */ | |
493 | ||
494 | /* | |
495 | Find a free handle slot. Normally only one should be used, | |
496 | but there could be two or more applications accessing the data | |
497 | at the same time. | |
498 | */ | |
6803acfc | 499 | int ipt_acc_handle_find_slot(void) |
e1b66101 | 500 | { |
6fe5ced9 | 501 | u_int32_t i; |
06817fca | 502 | /* Insert new table */ |
2ea7a43c | 503 | for (i = 0; i < ACCOUNT_MAX_HANDLES; i++) { |
06817fca | 504 | /* Found free slot */ |
6803acfc | 505 | if (ipt_acc_handles[i].data == NULL) { |
013fcc80 GE |
506 | /* Don't "mark" data as used as we are protected by a spinlock |
507 | by the calling function. handle_find_slot() is only a function | |
508 | to prevent code duplication. */ | |
bea3921b TJ |
509 | return i; |
510 | } | |
511 | } | |
2ea7a43c | 512 | |
06817fca | 513 | /* No free slot found */ |
013fcc80 GE |
514 | printk("ACCOUNT: No free handle slot found (max: %u). " |
515 | "Please increase ACCOUNT_MAX_HANDLES.\n", ACCOUNT_MAX_HANDLES); | |
bea3921b TJ |
516 | return -1; |
517 | } | |
518 | ||
6fe5ced9 | 519 | int ipt_acc_handle_free(u_int32_t handle) |
e1b66101 | 520 | { |
2ea7a43c | 521 | if (handle >= ACCOUNT_MAX_HANDLES) { |
6803acfc | 522 | printk("ACCOUNT: Invalid handle for ipt_acc_handle_free() specified:" |
013fcc80 | 523 | " %u\n", handle); |
bea3921b TJ |
524 | return -EINVAL; |
525 | } | |
2ea7a43c | 526 | |
6803acfc TJ |
527 | ipt_acc_data_free(ipt_acc_handles[handle].data, |
528 | ipt_acc_handles[handle].depth); | |
529 | memset (&ipt_acc_handles[handle], 0, sizeof (struct ipt_acc_handle)); | |
bea3921b TJ |
530 | return 0; |
531 | } | |
532 | ||
533 | /* Prepare data for read without flush. Use only for debugging! | |
534 | Real applications should use read&flush as it's way more efficent */ | |
6fe5ced9 | 535 | int ipt_acc_handle_prepare_read(char *tablename, u_int32_t *count) |
e1b66101 | 536 | { |
bea3921b | 537 | int handle, i, table_nr=-1; |
2ea7a43c | 538 | |
bea3921b | 539 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) |
6803acfc | 540 | if (strncmp(ipt_acc_tables[i].name, tablename, |
013fcc80 | 541 | ACCOUNT_TABLE_NAME_LEN) == 0) { |
bea3921b TJ |
542 | table_nr = i; |
543 | break; | |
544 | } | |
545 | ||
2ea7a43c | 546 | if (table_nr == -1) { |
6803acfc | 547 | printk("ACCOUNT: ipt_acc_handle_prepare_read(): " |
013fcc80 | 548 | "Table %s not found\n", tablename); |
bea3921b TJ |
549 | return -1; |
550 | } | |
2ea7a43c | 551 | |
06817fca | 552 | /* Can't find a free handle slot? */ |
6803acfc | 553 | if ((handle = ipt_acc_handle_find_slot()) == -1) |
bea3921b | 554 | return -1; |
2ea7a43c | 555 | |
06817fca | 556 | /* Fill up handle structure */ |
6803acfc TJ |
557 | ipt_acc_handles[handle].ip = ipt_acc_tables[table_nr].ip; |
558 | ipt_acc_handles[handle].depth = ipt_acc_tables[table_nr].depth; | |
559 | ipt_acc_handles[handle].itemcount = ipt_acc_tables[table_nr].itemcount; | |
2ea7a43c | 560 | |
06817fca | 561 | /* allocate "root" table */ |
6803acfc | 562 | if ((ipt_acc_handles[handle].data = |
013fcc80 GE |
563 | (void*)get_zeroed_page(GFP_ATOMIC)) == NULL) { |
564 | printk("ACCOUNT: out of memory for root table " | |
6803acfc TJ |
565 | "in ipt_acc_handle_prepare_read()\n"); |
566 | memset (&ipt_acc_handles[handle], 0, | |
567 | sizeof(struct ipt_acc_handle)); | |
2ea7a43c | 568 | return -1; |
bea3921b | 569 | } |
2ea7a43c | 570 | |
06817fca | 571 | /* Recursive copy of complete data structure */ |
6fe5ced9 | 572 | u_int32_t depth = ipt_acc_handles[handle].depth; |
2ea7a43c | 573 | if (depth == 0) { |
6803acfc TJ |
574 | memcpy(ipt_acc_handles[handle].data, |
575 | ipt_acc_tables[table_nr].data, | |
576 | sizeof(struct ipt_acc_mask_24)); | |
bea3921b | 577 | } else if (depth == 1) { |
6803acfc TJ |
578 | struct ipt_acc_mask_16 *src_16 = |
579 | (struct ipt_acc_mask_16 *)ipt_acc_tables[table_nr].data; | |
580 | struct ipt_acc_mask_16 *network_16 = | |
581 | (struct ipt_acc_mask_16 *)ipt_acc_handles[handle].data; | |
6fe5ced9 | 582 | u_int32_t b; |
2ea7a43c TJ |
583 | |
584 | for (b = 0; b <= 255; b++) { | |
585 | if (src_16->mask_24[b]) { | |
013fcc80 GE |
586 | if ((network_16->mask_24[b] = |
587 | (void*)get_zeroed_page(GFP_ATOMIC)) == NULL) { | |
588 | printk("ACCOUNT: out of memory during copy of 16 bit " | |
6803acfc TJ |
589 | "network in ipt_acc_handle_prepare_read()\n"); |
590 | ipt_acc_data_free(ipt_acc_handles[handle].data, depth); | |
591 | memset (&ipt_acc_handles[handle], 0, | |
592 | sizeof(struct ipt_acc_handle)); | |
2ea7a43c | 593 | return -1; |
bea3921b | 594 | } |
2ea7a43c | 595 | |
013fcc80 | 596 | memcpy(network_16->mask_24[b], src_16->mask_24[b], |
6803acfc | 597 | sizeof(struct ipt_acc_mask_24)); |
bea3921b TJ |
598 | } |
599 | } | |
600 | } else if(depth == 2) { | |
6803acfc TJ |
601 | struct ipt_acc_mask_8 *src_8 = |
602 | (struct ipt_acc_mask_8 *)ipt_acc_tables[table_nr].data; | |
603 | struct ipt_acc_mask_8 *network_8 = | |
604 | (struct ipt_acc_mask_8 *)ipt_acc_handles[handle].data; | |
6fe5ced9 | 605 | u_int32_t a; |
2ea7a43c TJ |
606 | |
607 | for (a = 0; a <= 255; a++) { | |
608 | if (src_8->mask_16[a]) { | |
013fcc80 GE |
609 | if ((network_8->mask_16[a] = |
610 | (void*)get_zeroed_page(GFP_ATOMIC)) == NULL) { | |
611 | printk("ACCOUNT: out of memory during copy of 24 bit network" | |
6803acfc TJ |
612 | " in ipt_acc_handle_prepare_read()\n"); |
613 | ipt_acc_data_free(ipt_acc_handles[handle].data, depth); | |
614 | memset (&ipt_acc_handles[handle], 0, | |
615 | sizeof(struct ipt_acc_handle)); | |
2ea7a43c | 616 | return -1; |
bea3921b TJ |
617 | } |
618 | ||
013fcc80 | 619 | memcpy(network_8->mask_16[a], src_8->mask_16[a], |
6803acfc | 620 | sizeof(struct ipt_acc_mask_16)); |
2ea7a43c | 621 | |
6803acfc TJ |
622 | struct ipt_acc_mask_16 *src_16 = src_8->mask_16[a]; |
623 | struct ipt_acc_mask_16 *network_16 = network_8->mask_16[a]; | |
6fe5ced9 | 624 | u_int32_t b; |
2ea7a43c TJ |
625 | |
626 | for (b = 0; b <= 255; b++) { | |
627 | if (src_16->mask_24[b]) { | |
013fcc80 GE |
628 | if ((network_16->mask_24[b] = |
629 | (void*)get_zeroed_page(GFP_ATOMIC)) == NULL) { | |
630 | printk("ACCOUNT: out of memory during copy of 16 bit" | |
6803acfc TJ |
631 | " network in ipt_acc_handle_prepare_read()\n"); |
632 | ipt_acc_data_free(ipt_acc_handles[handle].data, | |
013fcc80 | 633 | depth); |
6803acfc TJ |
634 | memset (&ipt_acc_handles[handle], 0, |
635 | sizeof(struct ipt_acc_handle)); | |
2ea7a43c | 636 | return -1; |
bea3921b | 637 | } |
2ea7a43c | 638 | |
013fcc80 | 639 | memcpy(network_16->mask_24[b], src_16->mask_24[b], |
6803acfc | 640 | sizeof(struct ipt_acc_mask_24)); |
bea3921b TJ |
641 | } |
642 | } | |
643 | } | |
644 | } | |
645 | } | |
646 | ||
6803acfc | 647 | *count = ipt_acc_tables[table_nr].itemcount; |
bea3921b TJ |
648 | return handle; |
649 | } | |
650 | ||
651 | /* Prepare data for read and flush it */ | |
6fe5ced9 | 652 | int ipt_acc_handle_prepare_read_flush(char *tablename, u_int32_t *count) |
e1b66101 | 653 | { |
bea3921b | 654 | int handle, i, table_nr=-1; |
2ea7a43c | 655 | |
bea3921b | 656 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) |
6803acfc | 657 | if (strncmp(ipt_acc_tables[i].name, tablename, |
013fcc80 | 658 | ACCOUNT_TABLE_NAME_LEN) == 0) { |
bea3921b TJ |
659 | table_nr = i; |
660 | break; | |
661 | } | |
662 | ||
2ea7a43c | 663 | if (table_nr == -1) { |
6803acfc | 664 | printk("ACCOUNT: ipt_acc_handle_prepare_read_flush(): " |
013fcc80 | 665 | "Table %s not found\n", tablename); |
bea3921b TJ |
666 | return -1; |
667 | } | |
2ea7a43c | 668 | |
06817fca | 669 | /* Can't find a free handle slot? */ |
6803acfc | 670 | if ((handle = ipt_acc_handle_find_slot()) == -1) |
bea3921b | 671 | return -1; |
2ea7a43c | 672 | |
ad773892 | 673 | /* Try to allocate memory */ |
1135d7cf | 674 | void *new_data_page = (void*)get_zeroed_page(GFP_ATOMIC); |
ad773892 TJ |
675 | if (!new_data_page) |
676 | { | |
6803acfc | 677 | printk("ACCOUNT: ipt_acc_handle_prepare_read_flush(): " |
013fcc80 | 678 | "Out of memory!\n"); |
ad773892 TJ |
679 | return -1; |
680 | } | |
681 | ||
06817fca | 682 | /* Fill up handle structure */ |
6803acfc TJ |
683 | ipt_acc_handles[handle].ip = ipt_acc_tables[table_nr].ip; |
684 | ipt_acc_handles[handle].depth = ipt_acc_tables[table_nr].depth; | |
685 | ipt_acc_handles[handle].itemcount = ipt_acc_tables[table_nr].itemcount; | |
686 | ipt_acc_handles[handle].data = ipt_acc_tables[table_nr].data; | |
687 | *count = ipt_acc_tables[table_nr].itemcount; | |
bea3921b | 688 | |
06817fca | 689 | /* "Flush" table data */ |
6803acfc TJ |
690 | ipt_acc_tables[table_nr].data = new_data_page; |
691 | ipt_acc_tables[table_nr].itemcount = 0; | |
bea3921b TJ |
692 | |
693 | return handle; | |
694 | } | |
695 | ||
e1b66101 | 696 | /* Copy 8 bit network data into a prepared buffer. |
bea3921b | 697 | We only copy entries != 0 to increase performance. |
bea3921b | 698 | */ |
6803acfc TJ |
699 | void ipt_acc_handle_copy_data(void *to_user, int *pos, |
700 | struct ipt_acc_mask_24 *data, | |
6fe5ced9 | 701 | u_int32_t net_ip, u_int32_t net_OR_mask) |
e1b66101 | 702 | { |
6803acfc | 703 | struct ipt_acc_handle_ip handle_ip; |
6fe5ced9 | 704 | u_int32_t handle_ip_size = sizeof (struct ipt_acc_handle_ip); |
e1b66101 | 705 | |
6fe5ced9 | 706 | u_int32_t i; |
e1b66101 TJ |
707 | |
708 | for (i = 0; i <= 255; i++) { | |
709 | if (data->ip[i].src_packets || data->ip[i].dst_packets) { | |
710 | handle_ip.ip = net_ip | net_OR_mask | (i<<24); | |
711 | ||
712 | handle_ip.src_packets = data->ip[i].src_packets; | |
713 | handle_ip.src_bytes = data->ip[i].src_bytes; | |
714 | handle_ip.dst_packets = data->ip[i].dst_packets; | |
715 | handle_ip.dst_bytes = data->ip[i].dst_bytes; | |
716 | ||
717 | /* Temporary buffer full? Flush to userspace */ | |
718 | if (*pos+handle_ip_size >= PAGE_SIZE) { | |
e1b66101 | 719 | *pos = 0; |
6fe5ced9 TJ |
720 | if (copy_to_user(to_user, ipt_acc_tmpbuf, *pos)) |
721 | return; | |
e1b66101 | 722 | } |
6803acfc | 723 | memcpy(ipt_acc_tmpbuf+*pos, &handle_ip, handle_ip_size); |
e1b66101 TJ |
724 | *pos += handle_ip_size; |
725 | } | |
726 | } | |
727 | } | |
728 | ||
729 | /* Copy the data from our internal structure | |
730 | We only copy entries != 0 to increase performance. | |
6803acfc | 731 | Overwrites ipt_acc_tmpbuf. |
e1b66101 | 732 | */ |
6fe5ced9 | 733 | int ipt_acc_handle_get_data(u_int32_t handle, void *to_user) |
e1b66101 | 734 | { |
6fe5ced9 | 735 | u_int32_t tmpbuf_pos=0; |
bea3921b | 736 | |
2ea7a43c | 737 | if (handle >= ACCOUNT_MAX_HANDLES) { |
6803acfc | 738 | printk("ACCOUNT: invalid handle for ipt_acc_handle_get_data() " |
013fcc80 | 739 | "specified: %u\n", handle); |
bea3921b TJ |
740 | return -1; |
741 | } | |
2ea7a43c | 742 | |
6803acfc | 743 | if (ipt_acc_handles[handle].data == NULL) { |
bea3921b TJ |
744 | printk("ACCOUNT: handle %u is BROKEN: Contains no data\n", handle); |
745 | return -1; | |
746 | } | |
2ea7a43c | 747 | |
6fe5ced9 TJ |
748 | u_int32_t net_ip = ipt_acc_handles[handle].ip; |
749 | u_int32_t depth = ipt_acc_handles[handle].depth; | |
2ea7a43c | 750 | |
06817fca | 751 | /* 8 bit network */ |
2ea7a43c | 752 | if (depth == 0) { |
6803acfc TJ |
753 | struct ipt_acc_mask_24 *network = |
754 | (struct ipt_acc_mask_24*)ipt_acc_handles[handle].data; | |
755 | ipt_acc_handle_copy_data(to_user, &tmpbuf_pos, network, net_ip, 0); | |
e1b66101 | 756 | |
06817fca | 757 | /* Flush remaining data to userspace */ |
9c44d30e | 758 | if (tmpbuf_pos) |
6fe5ced9 TJ |
759 | if (copy_to_user(to_user, ipt_acc_tmpbuf, tmpbuf_pos)) |
760 | return -1; | |
2ea7a43c | 761 | |
bea3921b TJ |
762 | return 0; |
763 | } | |
2ea7a43c | 764 | |
06817fca | 765 | /* 16 bit network */ |
2ea7a43c | 766 | if (depth == 1) { |
6803acfc TJ |
767 | struct ipt_acc_mask_16 *network_16 = |
768 | (struct ipt_acc_mask_16*)ipt_acc_handles[handle].data; | |
6fe5ced9 | 769 | u_int32_t b; |
2ea7a43c TJ |
770 | for (b = 0; b <= 255; b++) { |
771 | if (network_16->mask_24[b]) { | |
6803acfc TJ |
772 | struct ipt_acc_mask_24 *network = |
773 | (struct ipt_acc_mask_24*)network_16->mask_24[b]; | |
774 | ipt_acc_handle_copy_data(to_user, &tmpbuf_pos, network, | |
013fcc80 | 775 | net_ip, (b << 16)); |
bea3921b TJ |
776 | } |
777 | } | |
2ea7a43c | 778 | |
06817fca | 779 | /* Flush remaining data to userspace */ |
9c44d30e | 780 | if (tmpbuf_pos) |
6fe5ced9 TJ |
781 | if (copy_to_user(to_user, ipt_acc_tmpbuf, tmpbuf_pos)) |
782 | return -1; | |
2ea7a43c | 783 | |
bea3921b TJ |
784 | return 0; |
785 | } | |
2ea7a43c | 786 | |
06817fca | 787 | /* 24 bit network */ |
2ea7a43c | 788 | if (depth == 2) { |
6803acfc TJ |
789 | struct ipt_acc_mask_8 *network_8 = |
790 | (struct ipt_acc_mask_8*)ipt_acc_handles[handle].data; | |
6fe5ced9 | 791 | u_int32_t a, b; |
2ea7a43c TJ |
792 | for (a = 0; a <= 255; a++) { |
793 | if (network_8->mask_16[a]) { | |
6803acfc TJ |
794 | struct ipt_acc_mask_16 *network_16 = |
795 | (struct ipt_acc_mask_16*)network_8->mask_16[a]; | |
2ea7a43c TJ |
796 | for (b = 0; b <= 255; b++) { |
797 | if (network_16->mask_24[b]) { | |
6803acfc TJ |
798 | struct ipt_acc_mask_24 *network = |
799 | (struct ipt_acc_mask_24*)network_16->mask_24[b]; | |
800 | ipt_acc_handle_copy_data(to_user, &tmpbuf_pos, network, | |
801 | net_ip, (a << 8) | (b << 16)); | |
bea3921b TJ |
802 | } |
803 | } | |
804 | } | |
805 | } | |
2ea7a43c | 806 | |
06817fca | 807 | /* Flush remaining data to userspace */ |
9c44d30e | 808 | if (tmpbuf_pos) |
6fe5ced9 TJ |
809 | if (copy_to_user(to_user, ipt_acc_tmpbuf, tmpbuf_pos)) |
810 | return -1; | |
2ea7a43c | 811 | |
bea3921b TJ |
812 | return 0; |
813 | } | |
e1b66101 | 814 | |
bea3921b TJ |
815 | return -1; |
816 | } | |
817 | ||
6803acfc | 818 | static int ipt_acc_set_ctl(struct sock *sk, int cmd, |
6fe5ced9 | 819 | void *user, u_int32_t len) |
e1b66101 | 820 | { |
6803acfc | 821 | struct ipt_acc_handle_sockopt handle; |
bea3921b TJ |
822 | int ret = -EINVAL; |
823 | ||
824 | if (!capable(CAP_NET_ADMIN)) | |
2ea7a43c TJ |
825 | return -EPERM; |
826 | ||
827 | switch (cmd) { | |
828 | case IPT_SO_SET_ACCOUNT_HANDLE_FREE: | |
6803acfc TJ |
829 | if (len != sizeof(struct ipt_acc_handle_sockopt)) { |
830 | printk("ACCOUNT: ipt_acc_set_ctl: wrong data size (%u != %u) " | |
013fcc80 | 831 | "for IPT_SO_SET_HANDLE_FREE\n", |
6803acfc | 832 | len, sizeof(struct ipt_acc_handle_sockopt)); |
2ea7a43c TJ |
833 | break; |
834 | } | |
835 | ||
836 | if (copy_from_user (&handle, user, len)) { | |
6803acfc | 837 | printk("ACCOUNT: ipt_acc_set_ctl: copy_from_user failed for " |
013fcc80 | 838 | "IPT_SO_SET_HANDLE_FREE\n"); |
bea3921b | 839 | break; |
2ea7a43c TJ |
840 | } |
841 | ||
6803acfc TJ |
842 | spin_lock_bh(&ipt_acc_userspace_lock); |
843 | ret = ipt_acc_handle_free(handle.handle_nr); | |
844 | spin_unlock_bh(&ipt_acc_userspace_lock); | |
2ea7a43c TJ |
845 | break; |
846 | case IPT_SO_SET_ACCOUNT_HANDLE_FREE_ALL: { | |
6fe5ced9 | 847 | u_int32_t i; |
6803acfc | 848 | spin_lock_bh(&ipt_acc_userspace_lock); |
5b15c288 | 849 | for (i = 0; i < ACCOUNT_MAX_HANDLES; i++) |
6803acfc TJ |
850 | ipt_acc_handle_free(i); |
851 | spin_unlock_bh(&ipt_acc_userspace_lock); | |
5b15c288 TJ |
852 | ret = 0; |
853 | break; | |
854 | } | |
2ea7a43c | 855 | default: |
6803acfc | 856 | printk("ACCOUNT: ipt_acc_set_ctl: unknown request %i\n", cmd); |
bea3921b TJ |
857 | } |
858 | ||
859 | return ret; | |
860 | } | |
861 | ||
6803acfc | 862 | static int ipt_acc_get_ctl(struct sock *sk, int cmd, void *user, int *len) |
e1b66101 | 863 | { |
6803acfc | 864 | struct ipt_acc_handle_sockopt handle; |
bea3921b TJ |
865 | int ret = -EINVAL; |
866 | ||
867 | if (!capable(CAP_NET_ADMIN)) | |
2ea7a43c TJ |
868 | return -EPERM; |
869 | ||
870 | switch (cmd) { | |
871 | case IPT_SO_GET_ACCOUNT_PREPARE_READ_FLUSH: | |
872 | case IPT_SO_GET_ACCOUNT_PREPARE_READ: | |
6803acfc TJ |
873 | if (*len < sizeof(struct ipt_acc_handle_sockopt)) { |
874 | printk("ACCOUNT: ipt_acc_get_ctl: wrong data size (%u != %u) " | |
013fcc80 | 875 | "for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n", |
6803acfc | 876 | *len, sizeof(struct ipt_acc_handle_sockopt)); |
bea3921b | 877 | break; |
2ea7a43c TJ |
878 | } |
879 | ||
013fcc80 | 880 | if (copy_from_user (&handle, user, |
6803acfc | 881 | sizeof(struct ipt_acc_handle_sockopt))) { |
230248c5 | 882 | return -EFAULT; |
2ea7a43c TJ |
883 | break; |
884 | } | |
885 | ||
6803acfc TJ |
886 | spin_lock_bh(&ipt_acc_lock); |
887 | spin_lock_bh(&ipt_acc_userspace_lock); | |
2ea7a43c | 888 | if (cmd == IPT_SO_GET_ACCOUNT_PREPARE_READ_FLUSH) |
6803acfc | 889 | handle.handle_nr = ipt_acc_handle_prepare_read_flush( |
013fcc80 | 890 | handle.name, &handle.itemcount); |
2ea7a43c | 891 | else |
6803acfc | 892 | handle.handle_nr = ipt_acc_handle_prepare_read( |
013fcc80 | 893 | handle.name, &handle.itemcount); |
6803acfc TJ |
894 | spin_unlock_bh(&ipt_acc_userspace_lock); |
895 | spin_unlock_bh(&ipt_acc_lock); | |
2ea7a43c TJ |
896 | |
897 | if (handle.handle_nr == -1) { | |
230248c5 | 898 | return -EINVAL; |
2ea7a43c TJ |
899 | break; |
900 | } | |
901 | ||
013fcc80 | 902 | if (copy_to_user(user, &handle, |
6803acfc | 903 | sizeof(struct ipt_acc_handle_sockopt))) { |
230248c5 | 904 | return -EFAULT; |
2ea7a43c TJ |
905 | break; |
906 | } | |
907 | ret = 0; | |
908 | break; | |
909 | case IPT_SO_GET_ACCOUNT_GET_DATA: | |
6803acfc TJ |
910 | if (*len < sizeof(struct ipt_acc_handle_sockopt)) { |
911 | printk("ACCOUNT: ipt_acc_get_ctl: wrong data size (%u != %u)" | |
013fcc80 | 912 | " for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n", |
6803acfc | 913 | *len, sizeof(struct ipt_acc_handle_sockopt)); |
2ea7a43c TJ |
914 | break; |
915 | } | |
916 | ||
013fcc80 | 917 | if (copy_from_user (&handle, user, |
6803acfc | 918 | sizeof(struct ipt_acc_handle_sockopt))) { |
230248c5 | 919 | return -EFAULT; |
2ea7a43c TJ |
920 | break; |
921 | } | |
922 | ||
923 | if (handle.handle_nr >= ACCOUNT_MAX_HANDLES) { | |
230248c5 | 924 | return -EINVAL; |
2ea7a43c TJ |
925 | break; |
926 | } | |
927 | ||
6803acfc TJ |
928 | if (*len < ipt_acc_handles[handle.handle_nr].itemcount |
929 | * sizeof(struct ipt_acc_handle_ip)) { | |
930 | printk("ACCOUNT: ipt_acc_get_ctl: not enough space (%u < %u)" | |
013fcc80 | 931 | " to store data from IPT_SO_GET_ACCOUNT_GET_DATA\n", |
6803acfc TJ |
932 | *len, ipt_acc_handles[handle.handle_nr].itemcount |
933 | * sizeof(struct ipt_acc_handle_ip)); | |
2ea7a43c | 934 | ret = -ENOMEM; |
bea3921b | 935 | break; |
2ea7a43c TJ |
936 | } |
937 | ||
6803acfc TJ |
938 | spin_lock_bh(&ipt_acc_userspace_lock); |
939 | ret = ipt_acc_handle_get_data(handle.handle_nr, user); | |
940 | spin_unlock_bh(&ipt_acc_userspace_lock); | |
2ea7a43c | 941 | if (ret) { |
6803acfc | 942 | printk("ACCOUNT: ipt_acc_get_ctl: ipt_acc_handle_get_data" |
013fcc80 | 943 | " failed for handle %u\n", handle.handle_nr); |
2ea7a43c TJ |
944 | break; |
945 | } | |
946 | ||
947 | ret = 0; | |
948 | break; | |
949 | case IPT_SO_GET_ACCOUNT_GET_HANDLE_USAGE: { | |
6803acfc TJ |
950 | if (*len < sizeof(struct ipt_acc_handle_sockopt)) { |
951 | printk("ACCOUNT: ipt_acc_get_ctl: wrong data size (%u != %u)" | |
013fcc80 | 952 | " for IPT_SO_GET_ACCOUNT_GET_HANDLE_USAGE\n", |
6803acfc | 953 | *len, sizeof(struct ipt_acc_handle_sockopt)); |
5b15c288 | 954 | break; |
2ea7a43c TJ |
955 | } |
956 | ||
06817fca | 957 | /* Find out how many handles are in use */ |
6fe5ced9 | 958 | u_int32_t i; |
5b15c288 | 959 | handle.itemcount = 0; |
6803acfc | 960 | spin_lock_bh(&ipt_acc_userspace_lock); |
5b15c288 | 961 | for (i = 0; i < ACCOUNT_MAX_HANDLES; i++) |
6803acfc | 962 | if (ipt_acc_handles[i].data) |
5b15c288 | 963 | handle.itemcount++; |
6803acfc | 964 | spin_unlock_bh(&ipt_acc_userspace_lock); |
2ea7a43c | 965 | |
013fcc80 | 966 | if (copy_to_user(user, &handle, |
6803acfc | 967 | sizeof(struct ipt_acc_handle_sockopt))) { |
230248c5 | 968 | return -EFAULT; |
5b15c288 TJ |
969 | break; |
970 | } | |
971 | ret = 0; | |
972 | break; | |
973 | } | |
2ea7a43c | 974 | case IPT_SO_GET_ACCOUNT_GET_TABLE_NAMES: { |
6803acfc | 975 | spin_lock_bh(&ipt_acc_lock); |
2ea7a43c | 976 | |
06817fca | 977 | /* Determine size of table names */ |
6fe5ced9 | 978 | u_int32_t size = 0, i; |
2ea7a43c | 979 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) { |
6803acfc TJ |
980 | if (ipt_acc_tables[i].name[0] != 0) |
981 | size += strlen (ipt_acc_tables[i].name) + 1; | |
5b15c288 | 982 | } |
06817fca | 983 | size += 1; /* Terminating NULL character */ |
2ea7a43c TJ |
984 | |
985 | if (*len < size) { | |
6803acfc TJ |
986 | spin_unlock_bh(&ipt_acc_lock); |
987 | printk("ACCOUNT: ipt_acc_get_ctl: not enough space (%u < %u)" | |
013fcc80 | 988 | " to store table names\n", *len, size); |
5b15c288 TJ |
989 | ret = -ENOMEM; |
990 | break; | |
991 | } | |
06817fca | 992 | /* Copy table names to userspace */ |
5b15c288 | 993 | char *tnames = user; |
2ea7a43c | 994 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) { |
6803acfc TJ |
995 | if (ipt_acc_tables[i].name[0] != 0) { |
996 | int len = strlen (ipt_acc_tables[i].name) + 1; | |
013fcc80 | 997 | /* copy string + terminating zero */ |
6fe5ced9 TJ |
998 | if (copy_to_user(tnames, ipt_acc_tables[i].name, len)) { |
999 | spin_unlock_bh(&ipt_acc_lock); | |
1000 | return -EFAULT; | |
1001 | } | |
5b15c288 TJ |
1002 | tnames += len; |
1003 | } | |
1004 | } | |
06817fca | 1005 | /* Append terminating zero */ |
5b15c288 | 1006 | i = 0; |
6fe5ced9 | 1007 | ret = copy_to_user(tnames, &i, 1); |
6803acfc | 1008 | spin_unlock_bh(&ipt_acc_lock); |
6fe5ced9 TJ |
1009 | if (ret) |
1010 | return -EFAULT; | |
5b15c288 TJ |
1011 | ret = 0; |
1012 | break; | |
1013 | } | |
2ea7a43c | 1014 | default: |
6803acfc | 1015 | printk("ACCOUNT: ipt_acc_get_ctl: unknown request %i\n", cmd); |
bea3921b TJ |
1016 | } |
1017 | ||
1018 | return ret; | |
1019 | } | |
1020 | ||
6803acfc | 1021 | static struct ipt_target ipt_acc_reg = { |
6fe5ced9 TJ |
1022 | .name = "ACCOUNT", |
1023 | .target = ipt_acc_target, | |
1024 | .checkentry = ipt_acc_checkentry, | |
1025 | .destroy = ipt_acc_deleteentry, | |
1026 | .me = THIS_MODULE | |
013fcc80 GE |
1027 | }; |
1028 | ||
6803acfc | 1029 | static struct nf_sockopt_ops ipt_acc_sockopts = { |
6fe5ced9 TJ |
1030 | .pf = PF_INET, |
1031 | .set_optmin = IPT_SO_SET_ACCOUNT_HANDLE_FREE, | |
1032 | .set_optmax = IPT_SO_SET_ACCOUNT_MAX+1, | |
1033 | .set = ipt_acc_set_ctl, | |
1034 | .get_optmin = IPT_SO_GET_ACCOUNT_PREPARE_READ, | |
1035 | .get_optmax = IPT_SO_GET_ACCOUNT_MAX+1, | |
1036 | .get = ipt_acc_get_ctl | |
013fcc80 | 1037 | }; |
2ea7a43c | 1038 | |
e1b66101 TJ |
1039 | static int __init init(void) |
1040 | { | |
6803acfc | 1041 | if ((ipt_acc_tables = |
013fcc80 | 1042 | kmalloc(ACCOUNT_MAX_TABLES * |
6803acfc | 1043 | sizeof(struct ipt_acc_table), GFP_KERNEL)) == NULL) { |
bea3921b | 1044 | printk("ACCOUNT: Out of memory allocating account_tables structure"); |
6fe5ced9 | 1045 | goto error_cleanup; |
70288420 | 1046 | } |
6803acfc TJ |
1047 | memset(ipt_acc_tables, 0, |
1048 | ACCOUNT_MAX_TABLES * sizeof(struct ipt_acc_table)); | |
2ea7a43c | 1049 | |
6803acfc | 1050 | if ((ipt_acc_handles = |
013fcc80 | 1051 | kmalloc(ACCOUNT_MAX_HANDLES * |
6803acfc | 1052 | sizeof(struct ipt_acc_handle), GFP_KERNEL)) == NULL) { |
bea3921b | 1053 | printk("ACCOUNT: Out of memory allocating account_handles structure"); |
6fe5ced9 | 1054 | goto error_cleanup; |
70288420 | 1055 | } |
6803acfc TJ |
1056 | memset(ipt_acc_handles, 0, |
1057 | ACCOUNT_MAX_HANDLES * sizeof(struct ipt_acc_handle)); | |
bea3921b | 1058 | |
06817fca | 1059 | /* Allocate one page as temporary storage */ |
6803acfc | 1060 | if ((ipt_acc_tmpbuf = (void*)__get_free_page(GFP_KERNEL)) == NULL) { |
9c44d30e | 1061 | printk("ACCOUNT: Out of memory for temporary buffer page\n"); |
6fe5ced9 | 1062 | goto error_cleanup; |
9c44d30e | 1063 | } |
2ea7a43c | 1064 | |
bea3921b | 1065 | /* Register setsockopt */ |
6803acfc | 1066 | if (nf_register_sockopt(&ipt_acc_sockopts) < 0) { |
bea3921b | 1067 | printk("ACCOUNT: Can't register sockopts. Aborting\n"); |
6fe5ced9 | 1068 | goto error_cleanup; |
bea3921b | 1069 | } |
2ea7a43c | 1070 | |
6803acfc | 1071 | if (ipt_register_target(&ipt_acc_reg)) |
6fe5ced9 TJ |
1072 | goto error_cleanup; |
1073 | ||
70288420 | 1074 | return 0; |
6fe5ced9 TJ |
1075 | |
1076 | error_cleanup: | |
1077 | if(ipt_acc_tables) | |
1078 | kfree(ipt_acc_tables); | |
1079 | if(ipt_acc_handles) | |
1080 | kfree(ipt_acc_handles); | |
1081 | if (ipt_acc_tmpbuf) | |
1082 | free_page((unsigned long)ipt_acc_tmpbuf); | |
1083 | ||
1084 | return -EINVAL; | |
70288420 TJ |
1085 | } |
1086 | ||
e1b66101 TJ |
1087 | static void __exit fini(void) |
1088 | { | |
6803acfc | 1089 | ipt_unregister_target(&ipt_acc_reg); |
70288420 | 1090 | |
6803acfc | 1091 | nf_unregister_sockopt(&ipt_acc_sockopts); |
2ea7a43c | 1092 | |
6803acfc TJ |
1093 | kfree(ipt_acc_tables); |
1094 | kfree(ipt_acc_handles); | |
1095 | free_page((unsigned long)ipt_acc_tmpbuf); | |
70288420 TJ |
1096 | } |
1097 | ||
1098 | module_init(init); | |
1099 | module_exit(fini); | |
1100 | MODULE_LICENSE("GPL"); |