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54756114 TJ |
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 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> | |
23 | ||
24 | struct in_device; | |
25 | #include <net/route.h> | |
26 | #include <linux/netfilter_ipv4/ipt_ACCOUNT.h> | |
27 | ||
5b15c288 | 28 | #if 0 |
70288420 | 29 | #define DEBUGP printk |
5b15c288 TJ |
30 | #else |
31 | #define DEBUGP(format, args...) | |
32 | #endif | |
70288420 TJ |
33 | |
34 | struct ipt_account_table *ipt_account_tables = NULL; | |
35 | struct ipt_account_handle *ipt_account_handles = NULL; | |
9c44d30e | 36 | void *ipt_account_tmpbuf = NULL; |
70288420 | 37 | |
9c44d30e | 38 | // Spinlock used for manipulating the current accounting tables/data |
70288420 | 39 | static spinlock_t ipt_account_lock = SPIN_LOCK_UNLOCKED; |
9c44d30e TJ |
40 | // Spinlock used for manipulating userspace handles/snapshot data |
41 | static spinlock_t ipt_account_userspace_lock = SPIN_LOCK_UNLOCKED; | |
42 | ||
70288420 | 43 | |
70288420 | 44 | /* Recursive free of all data structures */ |
850cece6 | 45 | void ipt_account_data_free(void *data, unsigned char depth) |
70288420 TJ |
46 | { |
47 | // Empty data set | |
48 | if (!data) | |
49 | return; | |
50 | ||
850cece6 TJ |
51 | // Free for 8 bit network |
52 | if (depth == 0) | |
70288420 | 53 | { |
850cece6 | 54 | free_page((unsigned long)data); |
70288420 TJ |
55 | data = NULL; |
56 | return; | |
57 | } | |
58 | ||
59 | // Free for 16 bit network | |
850cece6 | 60 | if (depth == 1) |
70288420 TJ |
61 | { |
62 | struct ipt_account_mask_16 *mask_16 = (struct ipt_account_mask_16 *)data; | |
4adc8355 TJ |
63 | unsigned int b; |
64 | for (b=0; b <= 255; b++) | |
70288420 TJ |
65 | { |
66 | if (mask_16->mask_24[b] != 0) | |
67 | { | |
850cece6 | 68 | free_page((unsigned long)mask_16->mask_24[b]); |
70288420 TJ |
69 | mask_16->mask_24[b] = NULL; |
70 | } | |
71 | } | |
850cece6 | 72 | free_page((unsigned long)data); |
70288420 TJ |
73 | data = NULL; |
74 | return; | |
75 | } | |
76 | ||
77 | // Free for 24 bit network | |
850cece6 | 78 | if (depth == 3) |
70288420 | 79 | { |
4adc8355 TJ |
80 | unsigned int a, b; |
81 | for (a=0; a <= 255; a++) | |
70288420 TJ |
82 | { |
83 | if (((struct ipt_account_mask_8 *)data)->mask_16[a]) | |
84 | { | |
85 | struct ipt_account_mask_16 *mask_16 = (struct ipt_account_mask_16*)((struct ipt_account_mask_8 *)data)->mask_16[a]; | |
4adc8355 | 86 | for (b=0; b <= 255; b++) |
70288420 TJ |
87 | { |
88 | if (mask_16->mask_24[b]) { | |
850cece6 | 89 | free_page((unsigned long)mask_16->mask_24[b]); |
70288420 TJ |
90 | mask_16->mask_24[b] = NULL; |
91 | } | |
92 | } | |
850cece6 | 93 | free_page((unsigned long)mask_16); |
70288420 TJ |
94 | mask_16 = NULL; |
95 | } | |
96 | } | |
850cece6 | 97 | free_page((unsigned long)data); |
70288420 TJ |
98 | data = NULL; |
99 | return; | |
100 | } | |
101 | ||
850cece6 | 102 | printk("ACCOUNT: ipt_account_data_free called with unknown depth: %d\n", depth); |
70288420 TJ |
103 | return; |
104 | } | |
105 | ||
106 | /* Look for existing table / insert new one. Return internal ID or -1 on error */ | |
107 | int ipt_account_table_insert(char *name, unsigned int ip, unsigned int netmask) | |
108 | { | |
109 | unsigned int i; | |
110 | ||
850cece6 | 111 | DEBUGP("ACCOUNT: ipt_account_table_insert: %s, %u.%u.%u.%u/%u.%u.%u.%u\n", name, NIPQUAD(ip), NIPQUAD(netmask)); |
70288420 TJ |
112 | |
113 | // Look for existing table | |
114 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) | |
115 | { | |
bea3921b | 116 | if (strncmp(ipt_account_tables[i].name, name, ACCOUNT_TABLE_NAME_LEN) == 0) |
70288420 | 117 | { |
850cece6 TJ |
118 | DEBUGP("ACCOUNT: Found existing slot: %d - %u.%u.%u.%u/%u.%u.%u.%u\n", i, |
119 | NIPQUAD(ipt_account_tables[i].ip), NIPQUAD(ipt_account_tables[i].netmask)); | |
70288420 TJ |
120 | |
121 | if (ipt_account_tables[i].ip != ip || ipt_account_tables[i].netmask != netmask) | |
122 | { | |
850cece6 TJ |
123 | printk("ACCOUNT: Table %s found, but IP/netmask mismatch. IP/netmask found: %u.%u.%u.%u/%u.%u.%u.%u\n", |
124 | name, NIPQUAD(ipt_account_tables[i].ip), NIPQUAD(ipt_account_tables[i].netmask)); | |
70288420 TJ |
125 | return -1; |
126 | } | |
127 | ||
128 | ipt_account_tables[i].refcount++; | |
129 | DEBUGP("ACCOUNT: Refcount: %d\n", ipt_account_tables[i].refcount); | |
130 | return i; | |
131 | } | |
132 | } | |
133 | ||
134 | // Insert new table | |
135 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) | |
136 | { | |
137 | // Found free slot | |
138 | if (ipt_account_tables[i].name[0] == 0) | |
139 | { | |
140 | DEBUGP("ACCOUNT: Found free slot: %d\n", i); | |
141 | ||
142 | strncpy (ipt_account_tables[i].name, name, ACCOUNT_TABLE_NAME_LEN-1); | |
143 | ||
144 | ipt_account_tables[i].ip = ip; | |
145 | ipt_account_tables[i].netmask = netmask; | |
146 | ||
850cece6 TJ |
147 | // Calculate netsize |
148 | unsigned int j, calc_mask, netsize=0; | |
70288420 TJ |
149 | calc_mask = htonl(netmask); |
150 | for (j = 31; j > 0; j--) | |
151 | { | |
152 | if (calc_mask&(1<<j)) | |
850cece6 | 153 | netsize++; |
70288420 TJ |
154 | else |
155 | break; | |
156 | } | |
850cece6 TJ |
157 | |
158 | // Calculate depth from netsize | |
159 | if (netsize >= 24) | |
160 | ipt_account_tables[i].depth = 0; | |
161 | else if (netsize >= 16) | |
162 | ipt_account_tables[i].depth = 1; | |
163 | else if(netsize >= 8) | |
164 | ipt_account_tables[i].depth = 2; | |
165 | ||
166 | printk("ACCOUNT: calculated netsize: %u -> ipt_account_table depth %u\n", netsize, ipt_account_tables[i].depth); | |
70288420 TJ |
167 | |
168 | ipt_account_tables[i].refcount++; | |
dbdd79c9 | 169 | if ((ipt_account_tables[i].data = (void *)get_zeroed_page(GFP_KERNEL)) == NULL) |
70288420 | 170 | { |
850cece6 | 171 | printk("ACCOUNT: out of memory for data of table: %s\n", name); |
70288420 TJ |
172 | memset(&ipt_account_tables[i], 0, sizeof(struct ipt_account_table)); |
173 | return -1; | |
174 | } | |
850cece6 | 175 | |
70288420 TJ |
176 | return i; |
177 | } | |
178 | } | |
179 | ||
180 | // No free slot found | |
181 | printk("ACCOUNT: No free table slot found (max: %d). Please increase ACCOUNT_MAX_TABLES.\n", ACCOUNT_MAX_TABLES); | |
182 | return -1; | |
183 | } | |
184 | ||
185 | static int ipt_account_checkentry(const char *tablename, | |
186 | const struct ipt_entry *e, | |
187 | void *targinfo, | |
188 | unsigned int targinfosize, | |
189 | unsigned int hook_mask) | |
190 | { | |
191 | struct ipt_account_info *info = targinfo; | |
192 | ||
193 | if (targinfosize != IPT_ALIGN(sizeof(struct ipt_account_info))) { | |
194 | DEBUGP("ACCOUNT: targinfosize %u != %u\n", | |
195 | targinfosize, IPT_ALIGN(sizeof(struct ipt_account_info))); | |
196 | return 0; | |
197 | } | |
198 | ||
850cece6 | 199 | spin_lock_bh(&ipt_account_lock); |
70288420 TJ |
200 | int table_nr = ipt_account_table_insert(info->table_name, info->net_ip, info->net_mask); |
201 | if (table_nr == -1) | |
202 | { | |
203 | printk("ACCOUNT: Table insert problem. Aborting\n"); | |
850cece6 | 204 | spin_unlock_bh(&ipt_account_lock); |
70288420 TJ |
205 | return 0; |
206 | } | |
70288420 TJ |
207 | // Table nr caching so we don't have to do an extra string compare for every packet |
208 | info->table_nr = table_nr; | |
209 | ||
850cece6 TJ |
210 | spin_unlock_bh(&ipt_account_lock); |
211 | ||
70288420 TJ |
212 | return 1; |
213 | } | |
214 | ||
850cece6 TJ |
215 | void ipt_account_deleteentry(void *targinfo, unsigned int targinfosize) |
216 | { | |
217 | unsigned int i; | |
218 | struct ipt_account_info *info = targinfo; | |
219 | ||
220 | if (targinfosize != IPT_ALIGN(sizeof(struct ipt_account_info))) { | |
221 | DEBUGP("ACCOUNT: targinfosize %u != %u\n", | |
222 | targinfosize, IPT_ALIGN(sizeof(struct ipt_account_info))); | |
223 | } | |
224 | ||
225 | spin_lock_bh(&ipt_account_lock); | |
226 | ||
227 | DEBUGP("ACCOUNT: ipt_account_deleteentry called for table: %s (#%d)\n", info->table_name, info->table_nr); | |
228 | ||
229 | info->table_nr = -1; // Set back to original state | |
230 | ||
231 | // Look for table | |
232 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) | |
233 | { | |
bea3921b | 234 | if (strncmp(ipt_account_tables[i].name, info->table_name, ACCOUNT_TABLE_NAME_LEN) == 0) |
850cece6 TJ |
235 | { |
236 | DEBUGP("ACCOUNT: Found table at slot: %d\n", i); | |
237 | ||
238 | ipt_account_tables[i].refcount--; | |
239 | DEBUGP("ACCOUNT: Refcount left: %d\n", ipt_account_tables[i].refcount); | |
240 | ||
241 | // Table not needed anymore? | |
242 | if (ipt_account_tables[i].refcount == 0) | |
243 | { | |
244 | DEBUGP("ACCOUNT: Destroying table at slot: %d\n", i); | |
245 | ipt_account_data_free(ipt_account_tables[i].data, ipt_account_tables[i].depth); | |
246 | memset(&ipt_account_tables[i], 0, sizeof(struct ipt_account_table)); | |
247 | } | |
248 | ||
249 | spin_unlock_bh(&ipt_account_lock); | |
250 | return; | |
251 | } | |
252 | } | |
253 | ||
254 | // Table not found | |
255 | printk("ACCOUNT: Table %s not found for destroy\n", info->table_name); | |
256 | spin_unlock_bh(&ipt_account_lock); | |
257 | } | |
258 | ||
4068e14d TJ |
259 | void ipt_account_depth0_insert(struct ipt_account_mask_24 *mask_24, unsigned int net_ip, unsigned int netmask, |
260 | unsigned int src_ip, unsigned int dst_ip, unsigned int size, unsigned int *itemcount) | |
261 | { | |
262 | unsigned char is_src = 0, is_dst = 0; | |
263 | ||
264 | 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", | |
265 | NIPQUAD(src_ip), NIPQUAD(dst_ip), NIPQUAD(net_ip), NIPQUAD(netmask), size); | |
266 | ||
267 | // Check if src/dst is inside our network. | |
268 | // Special: net_ip = 0.0.0.0/0 gets stored as src in slot 0 | |
269 | if (!netmask) | |
270 | src_ip = 0; | |
271 | if ((net_ip&netmask) == (src_ip&netmask)) | |
272 | is_src = 1; | |
273 | if ((net_ip&netmask) == (dst_ip&netmask) && netmask) | |
274 | is_dst = 1; | |
275 | ||
276 | if (!is_src && !is_dst) | |
277 | { | |
278 | DEBUGP("ACCOUNT: Skipping packet %u.%u.%u.%u/%u.%u.%u.%u for net %u.%u.%u.%u/%u.%u.%u.%u\n", | |
279 | NIPQUAD(src_ip), NIPQUAD(dst_ip), NIPQUAD(net_ip), NIPQUAD(netmask)); | |
280 | return; | |
281 | } | |
282 | ||
283 | // Check if this entry is new | |
fa9124c2 | 284 | char is_src_new_ip = 0, is_dst_new_ip = 0; |
ff4ee64d TJ |
285 | |
286 | // Calculate array positions | |
287 | unsigned char src_slot = (unsigned char)((src_ip&0xFF000000) >> 24); | |
288 | unsigned char dst_slot = (unsigned char)((dst_ip&0xFF000000) >> 24); | |
4068e14d TJ |
289 | |
290 | // Increase size counters | |
291 | if (is_src) | |
292 | { | |
293 | // Calculate network slot | |
5dbfa65d | 294 | DEBUGP("ACCOUNT: Calculated SRC 8 bit network slot: %d\n", src_slot); |
ff4ee64d | 295 | if (!mask_24->ip[src_slot].src_packets && !mask_24->ip[src_slot].dst_packets) |
fa9124c2 | 296 | is_src_new_ip = 1; |
4068e14d | 297 | |
ff4ee64d TJ |
298 | mask_24->ip[src_slot].src_packets++; |
299 | mask_24->ip[src_slot].src_bytes+=size; | |
4068e14d TJ |
300 | } |
301 | if (is_dst) | |
302 | { | |
5dbfa65d | 303 | DEBUGP("ACCOUNT: Calculated DST 8 bit network slot: %d\n", dst_slot); |
ff4ee64d | 304 | if (!mask_24->ip[dst_slot].src_packets && !mask_24->ip[dst_slot].dst_packets) |
fa9124c2 | 305 | is_dst_new_ip = 1; |
4068e14d | 306 | |
ff4ee64d TJ |
307 | mask_24->ip[dst_slot].dst_packets++; |
308 | mask_24->ip[dst_slot].dst_bytes+=size; | |
4068e14d TJ |
309 | } |
310 | ||
fa9124c2 | 311 | // Increase itemcounter |
4adc8355 | 312 | DEBUGP("ACCOUNT: Itemcounter before: %d\n", *itemcount); |
ff4ee64d | 313 | if (src_slot == dst_slot) |
fa9124c2 | 314 | { |
4adc8355 TJ |
315 | if (is_src_new_ip || is_dst_new_ip) { |
316 | DEBUGP("ACCOUNT: src_slot == dst_slot: %d, %d\n", is_src_new_ip, is_dst_new_ip); | |
fa9124c2 | 317 | (*itemcount)++; |
4adc8355 | 318 | } |
fa9124c2 | 319 | } else { |
4adc8355 TJ |
320 | if (is_src_new_ip) { |
321 | DEBUGP("ACCOUNT: New src_ip: %u.%u.%u.%u\n", NIPQUAD(src_ip)); | |
fa9124c2 | 322 | (*itemcount)++; |
4adc8355 TJ |
323 | } |
324 | if (is_dst_new_ip) { | |
325 | DEBUGP("ACCOUNT: New dst_ip: %u.%u.%u.%u\n", NIPQUAD(dst_ip)); | |
fa9124c2 | 326 | (*itemcount)++; |
4adc8355 | 327 | } |
fa9124c2 | 328 | } |
4adc8355 | 329 | DEBUGP("ACCOUNT: Itemcounter after: %d\n", *itemcount); |
4068e14d TJ |
330 | } |
331 | ||
332 | void ipt_account_depth1_insert(struct ipt_account_mask_16 *mask_16, unsigned int net_ip, unsigned int netmask, | |
333 | unsigned int src_ip, unsigned int dst_ip, unsigned int size, unsigned int *itemcount) | |
334 | { | |
335 | // Do we need to process src IP? | |
336 | if ((net_ip&netmask) == (src_ip&netmask)) | |
337 | { | |
338 | unsigned char slot = (unsigned char)((src_ip&0x00FF0000) >> 16); | |
339 | DEBUGP("ACCOUNT: Calculated SRC 16 bit network slot: %d\n", slot); | |
340 | ||
341 | // Do we need to create a new mask_24 bucket? | |
dbdd79c9 | 342 | if (!mask_16->mask_24[slot] && (mask_16->mask_24[slot] = (void *)get_zeroed_page(GFP_KERNEL)) == NULL) |
4068e14d TJ |
343 | { |
344 | printk("ACCOUNT: Can't process packet because out of memory!\n"); | |
345 | return; | |
346 | } | |
347 | ||
348 | ipt_account_depth0_insert((struct ipt_account_mask_24 *)mask_16->mask_24[slot], net_ip, netmask, | |
4adc8355 | 349 | src_ip, 0, size, itemcount); |
4068e14d TJ |
350 | } |
351 | ||
352 | // Do we need to process dst IP? | |
353 | if ((net_ip&netmask) == (dst_ip&netmask)) | |
354 | { | |
355 | unsigned char slot = (unsigned char)((dst_ip&0x00FF0000) >> 16); | |
356 | DEBUGP("ACCOUNT: Calculated DST 16 bit network slot: %d\n", slot); | |
357 | ||
358 | // Do we need to create a new mask_24 bucket? | |
dbdd79c9 | 359 | if (!mask_16->mask_24[slot] && (mask_16->mask_24[slot] = (void *)get_zeroed_page(GFP_KERNEL)) == NULL) |
4068e14d TJ |
360 | { |
361 | printk("ACCOUT: Can't process packet because out of memory!\n"); | |
362 | return; | |
363 | } | |
364 | ||
365 | ipt_account_depth0_insert((struct ipt_account_mask_24 *)mask_16->mask_24[slot], net_ip, netmask, | |
4adc8355 | 366 | 0, dst_ip, size, itemcount); |
4068e14d TJ |
367 | } |
368 | } | |
369 | ||
370 | void ipt_account_depth2_insert(struct ipt_account_mask_8 *mask_8, unsigned int net_ip, unsigned int netmask, | |
371 | unsigned int src_ip, unsigned int dst_ip, unsigned int size, unsigned int *itemcount) | |
372 | { | |
373 | // Do we need to process src IP? | |
374 | if ((net_ip&netmask) == (src_ip&netmask)) | |
375 | { | |
376 | unsigned char slot = (unsigned char)((src_ip&0x0000FF00) >> 8); | |
377 | DEBUGP("ACCOUNT: Calculated SRC 24 bit network slot: %d\n", slot); | |
378 | ||
379 | // Do we need to create a new mask_24 bucket? | |
dbdd79c9 | 380 | if (!mask_8->mask_16[slot] && (mask_8->mask_16[slot] = (void *)get_zeroed_page(GFP_KERNEL)) == NULL) |
4068e14d TJ |
381 | { |
382 | printk("ACCOUNT: Can't process packet because out of memory!\n"); | |
383 | return; | |
384 | } | |
385 | ||
386 | ipt_account_depth1_insert((struct ipt_account_mask_16 *)mask_8->mask_16[slot], net_ip, netmask, | |
4adc8355 | 387 | src_ip, 0, size, itemcount); |
4068e14d TJ |
388 | } |
389 | ||
390 | // Do we need to process dst IP? | |
391 | if ((net_ip&netmask) == (dst_ip&netmask)) | |
392 | { | |
393 | unsigned char slot = (unsigned char)((dst_ip&0x0000FF00) >> 8); | |
394 | DEBUGP("ACCOUNT: Calculated DST 24 bit network slot: %d\n", slot); | |
395 | ||
396 | // Do we need to create a new mask_24 bucket? | |
dbdd79c9 | 397 | if (!mask_8->mask_16[slot] && (mask_8->mask_16[slot] = (void *)get_zeroed_page(GFP_KERNEL)) == NULL) |
4068e14d TJ |
398 | { |
399 | printk("ACCOUNT: Can't process packet because out of memory!\n"); | |
400 | return; | |
401 | } | |
402 | ||
403 | ipt_account_depth1_insert((struct ipt_account_mask_16 *)mask_8->mask_16[slot], net_ip, netmask, | |
4adc8355 | 404 | 0, dst_ip, size, itemcount); |
4068e14d TJ |
405 | } |
406 | } | |
407 | ||
408 | static unsigned int ipt_account_target(struct sk_buff **pskb, | |
409 | unsigned int hooknum, | |
410 | const struct net_device *in, | |
411 | const struct net_device *out, | |
412 | const void *targinfo, | |
413 | void *userinfo) | |
414 | { | |
415 | const struct ipt_account_info *info = (const struct ipt_account_info *)targinfo; | |
416 | unsigned int src_ip = (*pskb)->nh.iph->saddr; | |
417 | unsigned int dst_ip = (*pskb)->nh.iph->daddr; | |
418 | unsigned int size = ntohs((*pskb)->nh.iph->tot_len); | |
419 | ||
420 | spin_lock_bh(&ipt_account_lock); | |
421 | ||
422 | if (ipt_account_tables[info->table_nr].name[0] == 0) | |
423 | { | |
424 | printk("ACCOUNT: ipt_account_target: Invalid table id %u. IPs %u.%u.%u.%u/%u.%u.%u.%u\n", | |
425 | info->table_nr, NIPQUAD(src_ip), NIPQUAD(dst_ip)); | |
426 | spin_unlock_bh(&ipt_account_lock); | |
427 | return IPT_CONTINUE; | |
428 | } | |
429 | ||
430 | // 8 bit network or "any" network | |
431 | if (ipt_account_tables[info->table_nr].depth == 0) | |
432 | { | |
433 | // Count packet and check if the IP is new | |
434 | ipt_account_depth0_insert((struct ipt_account_mask_24 *)ipt_account_tables[info->table_nr].data, | |
435 | ipt_account_tables[info->table_nr].ip, ipt_account_tables[info->table_nr].netmask, | |
436 | src_ip, dst_ip, size, &ipt_account_tables[info->table_nr].itemcount); | |
437 | spin_unlock_bh(&ipt_account_lock); | |
438 | return IPT_CONTINUE; | |
439 | } | |
440 | ||
441 | // 16 bit network | |
442 | if (ipt_account_tables[info->table_nr].depth == 1) | |
443 | { | |
444 | ipt_account_depth1_insert((struct ipt_account_mask_16 *)ipt_account_tables[info->table_nr].data, | |
445 | ipt_account_tables[info->table_nr].ip, ipt_account_tables[info->table_nr].netmask, | |
446 | src_ip, dst_ip, size, &ipt_account_tables[info->table_nr].itemcount); | |
447 | spin_unlock_bh(&ipt_account_lock); | |
448 | return IPT_CONTINUE; | |
449 | } | |
450 | ||
451 | // 24 bit network | |
452 | if (ipt_account_tables[info->table_nr].depth == 2) | |
453 | { | |
454 | ipt_account_depth2_insert((struct ipt_account_mask_8 *)ipt_account_tables[info->table_nr].data, | |
455 | ipt_account_tables[info->table_nr].ip, ipt_account_tables[info->table_nr].netmask, | |
456 | src_ip, dst_ip, size, &ipt_account_tables[info->table_nr].itemcount); | |
457 | spin_unlock_bh(&ipt_account_lock); | |
458 | return IPT_CONTINUE; | |
459 | } | |
460 | ||
461 | printk("ACCOUNT: ipt_account_target: Unable to process packet. Table id %u. IPs %u.%u.%u.%u/%u.%u.%u.%u\n", | |
462 | info->table_nr, NIPQUAD(src_ip), NIPQUAD(dst_ip)); | |
463 | ||
464 | spin_unlock_bh(&ipt_account_lock); | |
465 | return IPT_CONTINUE; | |
466 | } | |
467 | ||
bea3921b TJ |
468 | /* |
469 | Functions dealing with "handles": | |
470 | Handles are snapshots of a accounting state. | |
471 | ||
472 | read snapshots are only for debugging the code | |
473 | and are very expensive concerning speed/memory | |
474 | compared to read_and_flush. | |
475 | ||
476 | The functions aren't protected by spinlocks themselves | |
477 | as this is done in the ioctl part of the code. | |
478 | */ | |
479 | ||
480 | /* | |
481 | Find a free handle slot. Normally only one should be used, | |
482 | but there could be two or more applications accessing the data | |
483 | at the same time. | |
484 | */ | |
485 | int ipt_account_handle_find_slot(void) | |
486 | { | |
487 | unsigned int i; | |
488 | // Insert new table | |
489 | for (i = 0; i < ACCOUNT_MAX_HANDLES; i++) | |
490 | { | |
491 | // Found free slot | |
492 | if (ipt_account_handles[i].data == NULL) | |
493 | { | |
494 | // Don't "mark" data as used as we are protected by a spinlock by the calling function. | |
495 | // handle_find_slot() is only a function to prevent code duplication. | |
496 | return i; | |
497 | } | |
498 | } | |
499 | ||
500 | // No free slot found | |
501 | printk("ACCOUNT: No free handle slot found (max: %u). Please increase ACCOUNT_MAX_HANDLES.\n", ACCOUNT_MAX_HANDLES); | |
502 | return -1; | |
503 | } | |
504 | ||
505 | int ipt_account_handle_free(unsigned int handle) | |
506 | { | |
507 | if (handle >= ACCOUNT_MAX_HANDLES) | |
508 | { | |
509 | printk("ACCOUNT: Invalid handle for ipt_account_handle_free() specified: %u\n", handle); | |
510 | return -EINVAL; | |
511 | } | |
512 | ||
513 | ipt_account_data_free(ipt_account_handles[handle].data, ipt_account_handles[handle].depth); | |
514 | memset (&ipt_account_handles[handle], 0, sizeof (struct ipt_account_handle)); | |
515 | return 0; | |
516 | } | |
517 | ||
518 | /* Prepare data for read without flush. Use only for debugging! | |
519 | Real applications should use read&flush as it's way more efficent */ | |
520 | int ipt_account_handle_prepare_read(char *tablename, unsigned int *count) | |
521 | { | |
522 | int handle, i, table_nr=-1; | |
523 | ||
524 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) | |
525 | if (strncmp(ipt_account_tables[i].name, tablename, ACCOUNT_TABLE_NAME_LEN) == 0) | |
526 | { | |
527 | table_nr = i; | |
528 | break; | |
529 | } | |
530 | ||
531 | if (table_nr == -1) | |
532 | { | |
533 | printk("ACCOUNT: ipt_account_handle_prepare_read(): Table %s not found\n", tablename); | |
534 | return -1; | |
535 | } | |
536 | ||
537 | // Can't find a free handle slot? | |
538 | if ((handle = ipt_account_handle_find_slot()) == -1) | |
539 | return -1; | |
540 | ||
541 | // Fill up handle structure | |
542 | ipt_account_handles[handle].ip = ipt_account_tables[table_nr].ip; | |
543 | ipt_account_handles[handle].depth = ipt_account_tables[table_nr].depth; | |
544 | ipt_account_handles[handle].itemcount = ipt_account_tables[table_nr].itemcount; | |
545 | ||
546 | // allocate "root" table | |
dbdd79c9 | 547 | if ((ipt_account_handles[handle].data = (void*)get_zeroed_page(GFP_KERNEL)) == NULL) |
bea3921b TJ |
548 | { |
549 | printk("ACCOUNT: out of memory for root table in ipt_account_handle_prepare_read()\n"); | |
550 | memset (&ipt_account_handles[handle], 0, sizeof(struct ipt_account_handle)); | |
551 | return -1; | |
552 | } | |
553 | ||
554 | // Recursive copy of complete data structure | |
555 | unsigned int depth = ipt_account_handles[handle].depth; | |
556 | if (depth == 0) | |
557 | { | |
558 | memcpy(ipt_account_handles[handle].data, ipt_account_tables[table_nr].data, sizeof(struct ipt_account_mask_24)); | |
559 | } else if (depth == 1) { | |
560 | struct ipt_account_mask_16 *src_16 = (struct ipt_account_mask_16 *)ipt_account_tables[table_nr].data; | |
561 | struct ipt_account_mask_16 *network_16 = (struct ipt_account_mask_16 *)ipt_account_handles[handle].data; | |
4adc8355 | 562 | unsigned int b; |
bea3921b | 563 | |
4adc8355 | 564 | for (b = 0; b <= 255; b++) |
bea3921b TJ |
565 | { |
566 | if (src_16->mask_24[b]) | |
567 | { | |
dbdd79c9 | 568 | if ((network_16->mask_24[b] = (void*)get_zeroed_page(GFP_KERNEL)) == NULL) |
bea3921b TJ |
569 | { |
570 | printk("ACCOUNT: out of memory during copy of 16 bit network in ipt_account_handle_prepare_read()\n"); | |
571 | ipt_account_data_free(ipt_account_handles[handle].data, depth); | |
572 | memset (&ipt_account_handles[handle], 0, sizeof(struct ipt_account_handle)); | |
573 | return -1; | |
574 | } | |
575 | ||
576 | memcpy(network_16->mask_24[b], src_16->mask_24[b], sizeof(struct ipt_account_mask_24)); | |
577 | } | |
578 | } | |
579 | } else if(depth == 2) { | |
580 | struct ipt_account_mask_8 *src_8 = (struct ipt_account_mask_8 *)ipt_account_tables[table_nr].data; | |
581 | struct ipt_account_mask_8 *network_8 = (struct ipt_account_mask_8 *)ipt_account_handles[handle].data; | |
4adc8355 | 582 | unsigned int a; |
bea3921b | 583 | |
4adc8355 | 584 | for (a = 0; a <= 255; a++) |
bea3921b TJ |
585 | { |
586 | if (src_8->mask_16[a]) | |
587 | { | |
dbdd79c9 | 588 | if ((network_8->mask_16[a] = (void*)get_zeroed_page(GFP_KERNEL)) == NULL) |
bea3921b TJ |
589 | { |
590 | printk("ACCOUNT: out of memory during copy of 24 bit network in ipt_account_handle_prepare_read()\n"); | |
591 | ipt_account_data_free(ipt_account_handles[handle].data, depth); | |
592 | memset (&ipt_account_handles[handle], 0, sizeof(struct ipt_account_handle)); | |
593 | return -1; | |
594 | } | |
595 | ||
596 | memcpy(network_8->mask_16[a], src_8->mask_16[a], sizeof(struct ipt_account_mask_16)); | |
597 | ||
598 | struct ipt_account_mask_16 *src_16 = src_8->mask_16[a]; | |
599 | struct ipt_account_mask_16 *network_16 = network_8->mask_16[a]; | |
4adc8355 | 600 | unsigned int b; |
bea3921b | 601 | |
4adc8355 | 602 | for (b = 0; b <= 255; b++) |
bea3921b TJ |
603 | { |
604 | if (src_16->mask_24[b]) | |
605 | { | |
dbdd79c9 | 606 | if ((network_16->mask_24[b] = (void*)get_zeroed_page(GFP_KERNEL)) == NULL) |
bea3921b TJ |
607 | { |
608 | printk("ACCOUNT: out of memory during copy of 16 bit network in ipt_account_handle_prepare_read()\n"); | |
609 | ipt_account_data_free(ipt_account_handles[handle].data, depth); | |
610 | memset (&ipt_account_handles[handle], 0, sizeof(struct ipt_account_handle)); | |
611 | return -1; | |
612 | } | |
613 | ||
614 | memcpy(network_16->mask_24[b], src_16->mask_24[b], sizeof(struct ipt_account_mask_24)); | |
615 | } | |
616 | } | |
617 | } | |
618 | } | |
619 | } | |
620 | ||
621 | *count = ipt_account_tables[table_nr].itemcount; | |
622 | return handle; | |
623 | } | |
624 | ||
625 | /* Prepare data for read and flush it */ | |
626 | int ipt_account_handle_prepare_read_flush(char *tablename, unsigned int *count) | |
627 | { | |
628 | int handle, i, table_nr=-1; | |
629 | ||
630 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) | |
631 | if (strncmp(ipt_account_tables[i].name, tablename, ACCOUNT_TABLE_NAME_LEN) == 0) | |
632 | { | |
633 | table_nr = i; | |
634 | break; | |
635 | } | |
636 | ||
637 | if (table_nr == -1) | |
638 | { | |
639 | printk("ACCOUNT: ipt_account_handle_prepare_read_flush(): Table %s not found\n", tablename); | |
640 | return -1; | |
641 | } | |
642 | ||
643 | // Can't find a free handle slot? | |
644 | if ((handle = ipt_account_handle_find_slot()) == -1) | |
645 | return -1; | |
646 | ||
647 | // Fill up handle structure | |
648 | ipt_account_handles[handle].ip = ipt_account_tables[table_nr].ip; | |
649 | ipt_account_handles[handle].depth = ipt_account_tables[table_nr].depth; | |
650 | ipt_account_handles[handle].itemcount = ipt_account_tables[table_nr].itemcount; | |
651 | ipt_account_handles[handle].data = ipt_account_tables[table_nr].data; | |
652 | *count = ipt_account_tables[table_nr].itemcount; | |
653 | ||
654 | // "Flush" table data | |
655 | ipt_account_tables[table_nr].data = (void*)get_zeroed_page(GFP_KERNEL); | |
656 | ipt_account_tables[table_nr].itemcount = 0; | |
657 | ||
658 | return handle; | |
659 | } | |
660 | ||
661 | /* Copy the actual that into a prepared buffer. | |
662 | We only copy entries != 0 to increase performance. | |
663 | The memory gets freed again in ipt_account_handle_free(). | |
664 | */ | |
665 | int ipt_account_handle_get_data(unsigned int handle, void *buffer) | |
666 | { | |
667 | struct ipt_account_handle_ip handle_ip; | |
668 | unsigned int handle_ip_size = sizeof (struct ipt_account_handle_ip); | |
9c44d30e | 669 | unsigned int i, tmpbuf_pos=0; |
bea3921b TJ |
670 | |
671 | if (handle >= ACCOUNT_MAX_HANDLES) | |
672 | { | |
673 | printk("ACCOUNT: invalid handle for ipt_account_handle_get_data() specified: %u\n", handle); | |
674 | return -1; | |
675 | } | |
676 | ||
677 | if (ipt_account_handles[handle].data == NULL) | |
678 | { | |
679 | printk("ACCOUNT: handle %u is BROKEN: Contains no data\n", handle); | |
680 | return -1; | |
681 | } | |
682 | ||
bea3921b TJ |
683 | unsigned int net_ip = ipt_account_handles[handle].ip; |
684 | unsigned int depth = ipt_account_handles[handle].depth; | |
685 | ||
686 | // 8 bit network | |
687 | if (depth == 0) | |
688 | { | |
689 | struct ipt_account_mask_24 *network = (struct ipt_account_mask_24*)ipt_account_handles[handle].data; | |
4adc8355 | 690 | for (i = 0; i <= 255; i++) |
bea3921b TJ |
691 | { |
692 | if (network->ip[i].src_packets || network->ip[i].dst_packets) | |
693 | { | |
694 | handle_ip.ip = net_ip | (i<<24); | |
695 | handle_ip.src_packets = network->ip[i].src_packets; | |
696 | handle_ip.src_bytes = network->ip[i].src_bytes; | |
697 | handle_ip.dst_packets = network->ip[i].dst_packets; | |
698 | handle_ip.dst_bytes = network->ip[i].dst_bytes; | |
699 | ||
9c44d30e TJ |
700 | // Temporary buffer full? Flush to userspace |
701 | if (tmpbuf_pos+handle_ip_size >= PAGE_SIZE) | |
702 | { | |
703 | copy_to_user(buffer, ipt_account_tmpbuf, tmpbuf_pos); | |
704 | tmpbuf_pos = 0; | |
705 | } | |
706 | memcpy(ipt_account_tmpbuf+tmpbuf_pos, &handle_ip, handle_ip_size); | |
707 | tmpbuf_pos += handle_ip_size; | |
bea3921b TJ |
708 | } |
709 | } | |
9c44d30e TJ |
710 | |
711 | // Flush remaining data to userspace | |
712 | if (tmpbuf_pos) | |
713 | copy_to_user(buffer, ipt_account_tmpbuf, tmpbuf_pos); | |
bea3921b TJ |
714 | |
715 | return 0; | |
716 | } | |
717 | ||
718 | // 16 bit network | |
719 | if (depth == 1) | |
720 | { | |
721 | struct ipt_account_mask_16 *network_16 = (struct ipt_account_mask_16*)ipt_account_handles[handle].data; | |
4adc8355 TJ |
722 | unsigned int b; |
723 | for (b = 0; b <= 255; b++) | |
bea3921b TJ |
724 | { |
725 | if (network_16->mask_24[b]) | |
726 | { | |
727 | struct ipt_account_mask_24 *network = (struct ipt_account_mask_24*)network_16->mask_24[b]; | |
4adc8355 | 728 | for (i = 0; i <= 255; i++) |
bea3921b TJ |
729 | { |
730 | if (network->ip[i].src_packets || network->ip[i].dst_packets) | |
731 | { | |
732 | handle_ip.ip = net_ip | (b << 16) | (i<<24); | |
733 | handle_ip.src_packets = network->ip[i].src_packets; | |
734 | handle_ip.src_bytes = network->ip[i].src_bytes; | |
735 | handle_ip.dst_packets = network->ip[i].dst_packets; | |
736 | handle_ip.dst_bytes = network->ip[i].dst_bytes; | |
737 | ||
9c44d30e TJ |
738 | // Temporary buffer full? Flush to userspace |
739 | if (tmpbuf_pos+handle_ip_size >= PAGE_SIZE) | |
740 | { | |
741 | copy_to_user(buffer, ipt_account_tmpbuf, tmpbuf_pos); | |
742 | tmpbuf_pos = 0; | |
743 | } | |
744 | memcpy(ipt_account_tmpbuf+tmpbuf_pos, &handle_ip, handle_ip_size); | |
745 | tmpbuf_pos += handle_ip_size; | |
bea3921b TJ |
746 | } |
747 | } | |
748 | } | |
749 | } | |
750 | ||
9c44d30e TJ |
751 | // Flush remaining data to userspace |
752 | if (tmpbuf_pos) | |
753 | copy_to_user(buffer, ipt_account_tmpbuf, tmpbuf_pos); | |
754 | ||
bea3921b TJ |
755 | return 0; |
756 | } | |
757 | ||
758 | // 24 bit network | |
759 | if (depth == 2) | |
760 | { | |
761 | struct ipt_account_mask_8 *network_8 = (struct ipt_account_mask_8*)ipt_account_handles[handle].data; | |
4adc8355 TJ |
762 | unsigned int a, b; |
763 | for (a = 0; a <= 255; a++) | |
bea3921b TJ |
764 | { |
765 | if (network_8->mask_16[a]) | |
766 | { | |
767 | struct ipt_account_mask_16 *network_16 = (struct ipt_account_mask_16*)network_8->mask_16[a]; | |
4adc8355 | 768 | for (b = 0; b <= 255; b++) |
bea3921b TJ |
769 | { |
770 | if (network_16->mask_24[b]) | |
771 | { | |
772 | struct ipt_account_mask_24 *network = (struct ipt_account_mask_24*)network_16->mask_24[b]; | |
4adc8355 | 773 | for (i = 0; i <= 255; i++) |
bea3921b TJ |
774 | { |
775 | if (network->ip[i].src_packets || network->ip[i].dst_packets) | |
776 | { | |
777 | handle_ip.ip = net_ip | (a << 8) | (b << 16) | (i<<24); | |
778 | handle_ip.src_packets = network->ip[i].src_packets; | |
779 | handle_ip.src_bytes = network->ip[i].src_bytes; | |
780 | handle_ip.dst_packets = network->ip[i].dst_packets; | |
781 | handle_ip.dst_bytes = network->ip[i].dst_bytes; | |
782 | ||
9c44d30e TJ |
783 | // Temporary buffer full? Flush to userspace |
784 | if (tmpbuf_pos+handle_ip_size >= PAGE_SIZE) | |
785 | { | |
786 | copy_to_user(buffer, ipt_account_tmpbuf, tmpbuf_pos); | |
787 | tmpbuf_pos = 0; | |
788 | } | |
789 | memcpy(ipt_account_tmpbuf+tmpbuf_pos, &handle_ip, handle_ip_size); | |
790 | tmpbuf_pos += handle_ip_size; | |
bea3921b TJ |
791 | } |
792 | } | |
793 | } | |
794 | } | |
795 | } | |
796 | } | |
797 | ||
9c44d30e TJ |
798 | // Flush remaining data to userspace |
799 | if (tmpbuf_pos) | |
800 | copy_to_user(buffer, ipt_account_tmpbuf, tmpbuf_pos); | |
801 | ||
bea3921b TJ |
802 | return 0; |
803 | } | |
9c44d30e | 804 | |
bea3921b TJ |
805 | return -1; |
806 | } | |
807 | ||
808 | static int ipt_account_set_ctl(struct sock *sk, int cmd, void *user, unsigned int len) | |
809 | { | |
810 | struct ipt_account_handle_sockopt handle; | |
811 | int ret = -EINVAL; | |
812 | ||
813 | if (!capable(CAP_NET_ADMIN)) | |
814 | return -EPERM; | |
815 | ||
816 | switch (cmd) | |
817 | { | |
818 | case IPT_SO_SET_ACCOUNT_HANDLE_FREE: | |
819 | if (len != sizeof(struct ipt_account_handle_sockopt)) | |
820 | { | |
821 | 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)); | |
822 | break; | |
823 | } | |
824 | ||
825 | if (copy_from_user (&handle, user, len)) | |
826 | { | |
827 | printk("ACCOUNT: ipt_account_set_ctl: copy_from_user failed for IPT_SO_SET_HANDLE_FREE\n"); | |
828 | break; | |
829 | } | |
830 | ||
9c44d30e | 831 | spin_lock_bh(&ipt_account_userspace_lock); |
bea3921b | 832 | ret = ipt_account_handle_free(handle.handle_nr); |
9c44d30e | 833 | spin_unlock_bh(&ipt_account_userspace_lock); |
bea3921b | 834 | break; |
5b15c288 TJ |
835 | case IPT_SO_SET_ACCOUNT_HANDLE_FREE_ALL: |
836 | { | |
837 | unsigned int i; | |
838 | spin_lock_bh(&ipt_account_userspace_lock); | |
839 | for (i = 0; i < ACCOUNT_MAX_HANDLES; i++) | |
840 | ipt_account_handle_free(i); | |
841 | spin_unlock_bh(&ipt_account_userspace_lock); | |
842 | ret = 0; | |
843 | break; | |
844 | } | |
bea3921b TJ |
845 | default: |
846 | printk("ACCOUNT: ipt_account_set_ctl: unknown request %i\n", cmd); | |
847 | } | |
848 | ||
849 | return ret; | |
850 | } | |
851 | ||
852 | static int ipt_account_get_ctl(struct sock *sk, int cmd, void *user, int *len) | |
853 | { | |
854 | struct ipt_account_handle_sockopt handle; | |
855 | int ret = -EINVAL; | |
856 | ||
857 | if (!capable(CAP_NET_ADMIN)) | |
858 | return -EPERM; | |
859 | ||
860 | switch (cmd) | |
861 | { | |
862 | case IPT_SO_GET_ACCOUNT_PREPARE_READ_FLUSH: | |
863 | case IPT_SO_GET_ACCOUNT_PREPARE_READ: | |
864 | if (*len < sizeof(struct ipt_account_handle_sockopt)) | |
865 | { | |
866 | printk("ACCOUNT: ipt_account_get_ctl: wrong data size (%u != %u) for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n", | |
867 | *len, sizeof(struct ipt_account_handle_sockopt)); | |
868 | break; | |
869 | } | |
870 | ||
871 | if (copy_from_user (&handle, user, sizeof(struct ipt_account_handle_sockopt))) | |
872 | { | |
873 | printk("ACCOUNT: ipt_account_get_ctl: copy_from_user failed for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n"); | |
874 | break; | |
875 | } | |
876 | ||
877 | spin_lock_bh(&ipt_account_lock); | |
9c44d30e | 878 | spin_lock_bh(&ipt_account_userspace_lock); |
bea3921b TJ |
879 | if (cmd == IPT_SO_GET_ACCOUNT_PREPARE_READ_FLUSH) |
880 | handle.handle_nr = ipt_account_handle_prepare_read_flush(handle.name, &handle.itemcount); | |
881 | else | |
882 | handle.handle_nr = ipt_account_handle_prepare_read(handle.name, &handle.itemcount); | |
9c44d30e | 883 | spin_unlock_bh(&ipt_account_userspace_lock); |
bea3921b TJ |
884 | spin_unlock_bh(&ipt_account_lock); |
885 | ||
886 | if (handle.handle_nr == -1) | |
887 | { | |
888 | printk("ACCOUNT: ipt_account_get_ctl: ipt_account_handle_prepare_read failed\n"); | |
889 | break; | |
890 | } | |
891 | ||
892 | if (copy_to_user(user, &handle, sizeof(struct ipt_account_handle_sockopt))) | |
893 | { | |
894 | printk("ACCOUNT: ipt_account_set_ctl: copy_to_user failed for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n"); | |
895 | break; | |
896 | } | |
897 | ret = 0; | |
898 | break; | |
899 | case IPT_SO_GET_ACCOUNT_GET_DATA: | |
900 | if (*len < sizeof(struct ipt_account_handle_sockopt)) | |
901 | { | |
902 | printk("ACCOUNT: ipt_account_get_ctl: wrong data size (%u != %u) for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n", | |
903 | *len, sizeof(struct ipt_account_handle_sockopt)); | |
904 | break; | |
905 | } | |
906 | ||
907 | if (copy_from_user (&handle, user, sizeof(struct ipt_account_handle_sockopt))) | |
908 | { | |
909 | printk("ACCOUNT: ipt_account_get_ctl: copy_from_user failed for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n"); | |
910 | break; | |
911 | } | |
912 | ||
913 | if (handle.handle_nr >= ACCOUNT_MAX_HANDLES) | |
914 | { | |
915 | printk("ACCOUNT: Invalid handle for IPT_SO_GET_ACCOUNT_GET_DATA: %u\n", handle.handle_nr); | |
916 | break; | |
917 | } | |
918 | ||
919 | if (*len < ipt_account_handles[handle.handle_nr].itemcount*sizeof(struct ipt_account_handle_ip)) | |
920 | { | |
921 | printk("ACCOUNT: ipt_account_get_ctl: not enough space (%u < %u) to store data from IPT_SO_GET_ACCOUNT_GET_DATA\n", | |
922 | *len, ipt_account_handles[handle.handle_nr].itemcount*sizeof(struct ipt_account_handle_ip)); | |
5b15c288 | 923 | ret = -ENOMEM; |
bea3921b TJ |
924 | break; |
925 | } | |
926 | ||
9c44d30e | 927 | spin_lock_bh(&ipt_account_userspace_lock); |
bea3921b | 928 | ret = ipt_account_handle_get_data(handle.handle_nr, user); |
9c44d30e | 929 | spin_unlock_bh(&ipt_account_userspace_lock); |
bea3921b TJ |
930 | if (ret) |
931 | { | |
932 | printk("ACCOUNT: ipt_account_get_ctl: ipt_account_handle_get_data failed for handle %u\n", handle.handle_nr); | |
933 | break; | |
934 | } | |
935 | ||
936 | ret = 0; | |
937 | break; | |
5b15c288 TJ |
938 | case IPT_SO_GET_ACCOUNT_GET_HANDLE_USAGE: |
939 | { | |
940 | if (*len < sizeof(struct ipt_account_handle_sockopt)) | |
941 | { | |
942 | printk("ACCOUNT: ipt_account_get_ctl: wrong data size (%u != %u) for IPT_SO_GET_ACCOUNT_GET_HANDLE_USAGE\n", | |
943 | *len, sizeof(struct ipt_account_handle_sockopt)); | |
944 | break; | |
945 | } | |
946 | ||
947 | // Find out how many handles are in use | |
948 | unsigned int i; | |
949 | handle.itemcount = 0; | |
950 | spin_lock_bh(&ipt_account_userspace_lock); | |
951 | for (i = 0; i < ACCOUNT_MAX_HANDLES; i++) | |
952 | if (ipt_account_handles[i].data) | |
953 | handle.itemcount++; | |
954 | spin_unlock_bh(&ipt_account_userspace_lock); | |
955 | ||
956 | if (copy_to_user(user, &handle, sizeof(struct ipt_account_handle_sockopt))) | |
957 | { | |
958 | printk("ACCOUNT: ipt_account_set_ctl: copy_to_user failed for IPT_SO_GET_ACCOUNT_GET_HANDLE_USAGE\n"); | |
959 | break; | |
960 | } | |
961 | ret = 0; | |
962 | break; | |
963 | } | |
964 | case IPT_SO_GET_ACCOUNT_GET_TABLE_NAMES: | |
965 | { | |
966 | spin_lock_bh(&ipt_account_lock); | |
967 | ||
968 | // Determine size of table names | |
969 | unsigned int size = 0, i; | |
970 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) | |
971 | { | |
972 | if (ipt_account_tables[i].name[0] != 0) | |
973 | size += strlen (ipt_account_tables[i].name) + 1; | |
974 | } | |
975 | size += 1; // Terminating NULL character | |
976 | ||
977 | if (*len < size) | |
978 | { | |
979 | spin_unlock_bh(&ipt_account_lock); | |
980 | printk("ACCOUNT: ipt_account_get_ctl: not enough space (%u < %u) to store table names\n", *len, size); | |
981 | ret = -ENOMEM; | |
982 | break; | |
983 | } | |
984 | // Copy table names to userspace | |
985 | char *tnames = user; | |
986 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) | |
987 | { | |
988 | if (ipt_account_tables[i].name[0] != 0) | |
989 | { | |
990 | int len = strlen (ipt_account_tables[i].name) + 1; | |
991 | copy_to_user(tnames, ipt_account_tables[i].name, len); // copy string + terminating zero | |
992 | tnames += len; | |
993 | } | |
994 | } | |
995 | // Append terminating zero | |
996 | i = 0; | |
997 | copy_to_user(tnames, &i, 1); | |
998 | spin_unlock_bh(&ipt_account_lock); | |
999 | ret = 0; | |
1000 | break; | |
1001 | } | |
bea3921b TJ |
1002 | default: |
1003 | printk("ACCOUNT: ipt_account_get_ctl: unknown request %i\n", cmd); | |
1004 | } | |
1005 | ||
1006 | return ret; | |
1007 | } | |
1008 | ||
70288420 | 1009 | static struct ipt_target ipt_account_reg |
850cece6 | 1010 | = { { NULL, NULL }, "ACCOUNT", ipt_account_target, ipt_account_checkentry, ipt_account_deleteentry, |
70288420 TJ |
1011 | THIS_MODULE }; |
1012 | ||
bea3921b TJ |
1013 | static struct nf_sockopt_ops ipt_account_sockopts |
1014 | = { { NULL, NULL }, PF_INET, IPT_SO_SET_ACCOUNT_HANDLE_FREE, IPT_SO_SET_ACCOUNT_MAX+1, ipt_account_set_ctl, | |
1015 | IPT_SO_GET_ACCOUNT_PREPARE_READ, IPT_SO_GET_ACCOUNT_MAX+1, ipt_account_get_ctl, 0, NULL }; | |
1016 | ||
70288420 TJ |
1017 | static int __init init(void) |
1018 | { | |
bea3921b TJ |
1019 | if (PAGE_SIZE < 4096) |
1020 | { | |
1021 | printk("ACCOUNT: Sorry we need at least a PAGE_SIZE of 4096. Found: %lu\n", PAGE_SIZE); | |
1022 | return -EINVAL; | |
1023 | } | |
1024 | ||
dbdd79c9 | 1025 | if ((ipt_account_tables = kmalloc(ACCOUNT_MAX_TABLES*sizeof(struct ipt_account_table), GFP_KERNEL)) == NULL) |
70288420 | 1026 | { |
bea3921b TJ |
1027 | printk("ACCOUNT: Out of memory allocating account_tables structure"); |
1028 | return -EINVAL; | |
70288420 | 1029 | } |
850cece6 | 1030 | memset(ipt_account_tables, 0, ACCOUNT_MAX_TABLES*sizeof(struct ipt_account_table)); |
70288420 | 1031 | |
dbdd79c9 | 1032 | if ((ipt_account_handles = kmalloc(ACCOUNT_MAX_HANDLES*sizeof(struct ipt_account_handle), GFP_KERNEL)) == NULL) |
70288420 | 1033 | { |
bea3921b TJ |
1034 | printk("ACCOUNT: Out of memory allocating account_handles structure"); |
1035 | kfree (ipt_account_tables); | |
1036 | ipt_account_tables = NULL; | |
1037 | return -EINVAL; | |
70288420 | 1038 | } |
850cece6 | 1039 | memset(ipt_account_handles, 0, ACCOUNT_MAX_HANDLES*sizeof(struct ipt_account_handle)); |
bea3921b | 1040 | |
9c44d30e TJ |
1041 | // Allocate one page as temporary storage |
1042 | if ((ipt_account_tmpbuf = (void*)__get_free_page(GFP_KERNEL)) == NULL) | |
1043 | { | |
1044 | printk("ACCOUNT: Out of memory for temporary buffer page\n"); | |
dbdd79c9 TJ |
1045 | kfree(ipt_account_tables); |
1046 | kfree(ipt_account_handles); | |
9c44d30e TJ |
1047 | ipt_account_tables = NULL; |
1048 | ipt_account_handles = NULL; | |
1049 | return -EINVAL; | |
1050 | } | |
1051 | ||
bea3921b TJ |
1052 | /* Register setsockopt */ |
1053 | if (nf_register_sockopt(&ipt_account_sockopts) < 0) | |
1054 | { | |
1055 | printk("ACCOUNT: Can't register sockopts. Aborting\n"); | |
1056 | ||
dbdd79c9 | 1057 | kfree(ipt_account_tables); |
bea3921b | 1058 | kfree(ipt_account_handles); |
5b15c288 | 1059 | free_page((unsigned long)ipt_account_tmpbuf); |
dbdd79c9 | 1060 | ipt_account_tables = NULL; |
bea3921b | 1061 | ipt_account_handles = NULL; |
dbdd79c9 | 1062 | ipt_account_tmpbuf = NULL; |
bea3921b TJ |
1063 | |
1064 | return -EINVAL; | |
1065 | } | |
70288420 TJ |
1066 | |
1067 | if (ipt_register_target(&ipt_account_reg)) | |
1068 | return -EINVAL; | |
1069 | ||
1070 | return 0; | |
1071 | } | |
1072 | ||
1073 | static void __exit fini(void) | |
1074 | { | |
1075 | ipt_unregister_target(&ipt_account_reg); | |
1076 | ||
bea3921b TJ |
1077 | nf_unregister_sockopt(&ipt_account_sockopts); |
1078 | ||
70288420 | 1079 | kfree(ipt_account_tables); |
70288420 | 1080 | kfree(ipt_account_handles); |
5b15c288 | 1081 | free_page((unsigned long)ipt_account_tmpbuf); |
dbdd79c9 TJ |
1082 | |
1083 | ipt_account_tables = NULL; | |
70288420 | 1084 | ipt_account_handles = NULL; |
dbdd79c9 | 1085 | ipt_account_tmpbuf = NULL; |
70288420 TJ |
1086 | } |
1087 | ||
1088 | module_init(init); | |
1089 | module_exit(fini); | |
1090 | MODULE_LICENSE("GPL"); |