Commit | Line | Data |
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70288420 TJ |
1 | /* |
2 | * This is a module which is used for counting packets. | |
3 | */ | |
4 | #include <linux/module.h> | |
5 | #include <linux/skbuff.h> | |
6 | #include <linux/ip.h> | |
7 | #include <linux/spinlock.h> | |
8 | #include <net/icmp.h> | |
9 | #include <net/udp.h> | |
10 | #include <net/tcp.h> | |
11 | #include <linux/netfilter_ipv4/ip_tables.h> | |
12 | ||
13 | struct in_device; | |
14 | #include <net/route.h> | |
15 | #include <linux/netfilter_ipv4/ipt_ACCOUNT.h> | |
16 | ||
5b15c288 | 17 | #if 0 |
70288420 | 18 | #define DEBUGP printk |
5b15c288 TJ |
19 | #else |
20 | #define DEBUGP(format, args...) | |
21 | #endif | |
70288420 TJ |
22 | |
23 | struct ipt_account_table *ipt_account_tables = NULL; | |
24 | struct ipt_account_handle *ipt_account_handles = NULL; | |
9c44d30e | 25 | void *ipt_account_tmpbuf = NULL; |
70288420 | 26 | |
9c44d30e | 27 | // Spinlock used for manipulating the current accounting tables/data |
70288420 | 28 | static spinlock_t ipt_account_lock = SPIN_LOCK_UNLOCKED; |
9c44d30e TJ |
29 | // Spinlock used for manipulating userspace handles/snapshot data |
30 | static spinlock_t ipt_account_userspace_lock = SPIN_LOCK_UNLOCKED; | |
31 | ||
70288420 | 32 | |
70288420 | 33 | /* Recursive free of all data structures */ |
850cece6 | 34 | void ipt_account_data_free(void *data, unsigned char depth) |
70288420 TJ |
35 | { |
36 | // Empty data set | |
37 | if (!data) | |
38 | return; | |
39 | ||
850cece6 TJ |
40 | // Free for 8 bit network |
41 | if (depth == 0) | |
70288420 | 42 | { |
850cece6 | 43 | free_page((unsigned long)data); |
70288420 TJ |
44 | data = NULL; |
45 | return; | |
46 | } | |
47 | ||
48 | // Free for 16 bit network | |
850cece6 | 49 | if (depth == 1) |
70288420 TJ |
50 | { |
51 | struct ipt_account_mask_16 *mask_16 = (struct ipt_account_mask_16 *)data; | |
4adc8355 TJ |
52 | unsigned int b; |
53 | for (b=0; b <= 255; b++) | |
70288420 TJ |
54 | { |
55 | if (mask_16->mask_24[b] != 0) | |
56 | { | |
850cece6 | 57 | free_page((unsigned long)mask_16->mask_24[b]); |
70288420 TJ |
58 | mask_16->mask_24[b] = NULL; |
59 | } | |
60 | } | |
850cece6 | 61 | free_page((unsigned long)data); |
70288420 TJ |
62 | data = NULL; |
63 | return; | |
64 | } | |
65 | ||
66 | // Free for 24 bit network | |
850cece6 | 67 | if (depth == 3) |
70288420 | 68 | { |
4adc8355 TJ |
69 | unsigned int a, b; |
70 | for (a=0; a <= 255; a++) | |
70288420 TJ |
71 | { |
72 | if (((struct ipt_account_mask_8 *)data)->mask_16[a]) | |
73 | { | |
74 | struct ipt_account_mask_16 *mask_16 = (struct ipt_account_mask_16*)((struct ipt_account_mask_8 *)data)->mask_16[a]; | |
4adc8355 | 75 | for (b=0; b <= 255; b++) |
70288420 TJ |
76 | { |
77 | if (mask_16->mask_24[b]) { | |
850cece6 | 78 | free_page((unsigned long)mask_16->mask_24[b]); |
70288420 TJ |
79 | mask_16->mask_24[b] = NULL; |
80 | } | |
81 | } | |
850cece6 | 82 | free_page((unsigned long)mask_16); |
70288420 TJ |
83 | mask_16 = NULL; |
84 | } | |
85 | } | |
850cece6 | 86 | free_page((unsigned long)data); |
70288420 TJ |
87 | data = NULL; |
88 | return; | |
89 | } | |
90 | ||
850cece6 | 91 | printk("ACCOUNT: ipt_account_data_free called with unknown depth: %d\n", depth); |
70288420 TJ |
92 | return; |
93 | } | |
94 | ||
95 | /* Look for existing table / insert new one. Return internal ID or -1 on error */ | |
96 | int ipt_account_table_insert(char *name, unsigned int ip, unsigned int netmask) | |
97 | { | |
98 | unsigned int i; | |
99 | ||
850cece6 | 100 | DEBUGP("ACCOUNT: ipt_account_table_insert: %s, %u.%u.%u.%u/%u.%u.%u.%u\n", name, NIPQUAD(ip), NIPQUAD(netmask)); |
70288420 TJ |
101 | |
102 | // Look for existing table | |
103 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) | |
104 | { | |
bea3921b | 105 | if (strncmp(ipt_account_tables[i].name, name, ACCOUNT_TABLE_NAME_LEN) == 0) |
70288420 | 106 | { |
850cece6 TJ |
107 | DEBUGP("ACCOUNT: Found existing slot: %d - %u.%u.%u.%u/%u.%u.%u.%u\n", i, |
108 | NIPQUAD(ipt_account_tables[i].ip), NIPQUAD(ipt_account_tables[i].netmask)); | |
70288420 TJ |
109 | |
110 | if (ipt_account_tables[i].ip != ip || ipt_account_tables[i].netmask != netmask) | |
111 | { | |
850cece6 TJ |
112 | printk("ACCOUNT: Table %s found, but IP/netmask mismatch. IP/netmask found: %u.%u.%u.%u/%u.%u.%u.%u\n", |
113 | name, NIPQUAD(ipt_account_tables[i].ip), NIPQUAD(ipt_account_tables[i].netmask)); | |
70288420 TJ |
114 | return -1; |
115 | } | |
116 | ||
117 | ipt_account_tables[i].refcount++; | |
118 | DEBUGP("ACCOUNT: Refcount: %d\n", ipt_account_tables[i].refcount); | |
119 | return i; | |
120 | } | |
121 | } | |
122 | ||
123 | // Insert new table | |
124 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) | |
125 | { | |
126 | // Found free slot | |
127 | if (ipt_account_tables[i].name[0] == 0) | |
128 | { | |
129 | DEBUGP("ACCOUNT: Found free slot: %d\n", i); | |
130 | ||
131 | strncpy (ipt_account_tables[i].name, name, ACCOUNT_TABLE_NAME_LEN-1); | |
132 | ||
133 | ipt_account_tables[i].ip = ip; | |
134 | ipt_account_tables[i].netmask = netmask; | |
135 | ||
850cece6 TJ |
136 | // Calculate netsize |
137 | unsigned int j, calc_mask, netsize=0; | |
70288420 TJ |
138 | calc_mask = htonl(netmask); |
139 | for (j = 31; j > 0; j--) | |
140 | { | |
141 | if (calc_mask&(1<<j)) | |
850cece6 | 142 | netsize++; |
70288420 TJ |
143 | else |
144 | break; | |
145 | } | |
850cece6 TJ |
146 | |
147 | // Calculate depth from netsize | |
148 | if (netsize >= 24) | |
149 | ipt_account_tables[i].depth = 0; | |
150 | else if (netsize >= 16) | |
151 | ipt_account_tables[i].depth = 1; | |
152 | else if(netsize >= 8) | |
153 | ipt_account_tables[i].depth = 2; | |
154 | ||
155 | printk("ACCOUNT: calculated netsize: %u -> ipt_account_table depth %u\n", netsize, ipt_account_tables[i].depth); | |
70288420 TJ |
156 | |
157 | ipt_account_tables[i].refcount++; | |
dbdd79c9 | 158 | if ((ipt_account_tables[i].data = (void *)get_zeroed_page(GFP_KERNEL)) == NULL) |
70288420 | 159 | { |
850cece6 | 160 | printk("ACCOUNT: out of memory for data of table: %s\n", name); |
70288420 TJ |
161 | memset(&ipt_account_tables[i], 0, sizeof(struct ipt_account_table)); |
162 | return -1; | |
163 | } | |
850cece6 | 164 | |
70288420 TJ |
165 | return i; |
166 | } | |
167 | } | |
168 | ||
169 | // No free slot found | |
170 | printk("ACCOUNT: No free table slot found (max: %d). Please increase ACCOUNT_MAX_TABLES.\n", ACCOUNT_MAX_TABLES); | |
171 | return -1; | |
172 | } | |
173 | ||
174 | static int ipt_account_checkentry(const char *tablename, | |
175 | const struct ipt_entry *e, | |
176 | void *targinfo, | |
177 | unsigned int targinfosize, | |
178 | unsigned int hook_mask) | |
179 | { | |
180 | struct ipt_account_info *info = targinfo; | |
181 | ||
182 | if (targinfosize != IPT_ALIGN(sizeof(struct ipt_account_info))) { | |
183 | DEBUGP("ACCOUNT: targinfosize %u != %u\n", | |
184 | targinfosize, IPT_ALIGN(sizeof(struct ipt_account_info))); | |
185 | return 0; | |
186 | } | |
187 | ||
850cece6 | 188 | spin_lock_bh(&ipt_account_lock); |
70288420 TJ |
189 | int table_nr = ipt_account_table_insert(info->table_name, info->net_ip, info->net_mask); |
190 | if (table_nr == -1) | |
191 | { | |
192 | printk("ACCOUNT: Table insert problem. Aborting\n"); | |
850cece6 | 193 | spin_unlock_bh(&ipt_account_lock); |
70288420 TJ |
194 | return 0; |
195 | } | |
70288420 TJ |
196 | // Table nr caching so we don't have to do an extra string compare for every packet |
197 | info->table_nr = table_nr; | |
198 | ||
850cece6 TJ |
199 | spin_unlock_bh(&ipt_account_lock); |
200 | ||
70288420 TJ |
201 | return 1; |
202 | } | |
203 | ||
850cece6 TJ |
204 | void ipt_account_deleteentry(void *targinfo, unsigned int targinfosize) |
205 | { | |
206 | unsigned int i; | |
207 | struct ipt_account_info *info = targinfo; | |
208 | ||
209 | if (targinfosize != IPT_ALIGN(sizeof(struct ipt_account_info))) { | |
210 | DEBUGP("ACCOUNT: targinfosize %u != %u\n", | |
211 | targinfosize, IPT_ALIGN(sizeof(struct ipt_account_info))); | |
212 | } | |
213 | ||
214 | spin_lock_bh(&ipt_account_lock); | |
215 | ||
216 | DEBUGP("ACCOUNT: ipt_account_deleteentry called for table: %s (#%d)\n", info->table_name, info->table_nr); | |
217 | ||
218 | info->table_nr = -1; // Set back to original state | |
219 | ||
220 | // Look for table | |
221 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) | |
222 | { | |
bea3921b | 223 | if (strncmp(ipt_account_tables[i].name, info->table_name, ACCOUNT_TABLE_NAME_LEN) == 0) |
850cece6 TJ |
224 | { |
225 | DEBUGP("ACCOUNT: Found table at slot: %d\n", i); | |
226 | ||
227 | ipt_account_tables[i].refcount--; | |
228 | DEBUGP("ACCOUNT: Refcount left: %d\n", ipt_account_tables[i].refcount); | |
229 | ||
230 | // Table not needed anymore? | |
231 | if (ipt_account_tables[i].refcount == 0) | |
232 | { | |
233 | DEBUGP("ACCOUNT: Destroying table at slot: %d\n", i); | |
234 | ipt_account_data_free(ipt_account_tables[i].data, ipt_account_tables[i].depth); | |
235 | memset(&ipt_account_tables[i], 0, sizeof(struct ipt_account_table)); | |
236 | } | |
237 | ||
238 | spin_unlock_bh(&ipt_account_lock); | |
239 | return; | |
240 | } | |
241 | } | |
242 | ||
243 | // Table not found | |
244 | printk("ACCOUNT: Table %s not found for destroy\n", info->table_name); | |
245 | spin_unlock_bh(&ipt_account_lock); | |
246 | } | |
247 | ||
4068e14d TJ |
248 | void ipt_account_depth0_insert(struct ipt_account_mask_24 *mask_24, unsigned int net_ip, unsigned int netmask, |
249 | unsigned int src_ip, unsigned int dst_ip, unsigned int size, unsigned int *itemcount) | |
250 | { | |
251 | unsigned char is_src = 0, is_dst = 0; | |
252 | ||
253 | 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", | |
254 | NIPQUAD(src_ip), NIPQUAD(dst_ip), NIPQUAD(net_ip), NIPQUAD(netmask), size); | |
255 | ||
256 | // Check if src/dst is inside our network. | |
257 | // Special: net_ip = 0.0.0.0/0 gets stored as src in slot 0 | |
258 | if (!netmask) | |
259 | src_ip = 0; | |
260 | if ((net_ip&netmask) == (src_ip&netmask)) | |
261 | is_src = 1; | |
262 | if ((net_ip&netmask) == (dst_ip&netmask) && netmask) | |
263 | is_dst = 1; | |
264 | ||
265 | if (!is_src && !is_dst) | |
266 | { | |
267 | DEBUGP("ACCOUNT: Skipping packet %u.%u.%u.%u/%u.%u.%u.%u for net %u.%u.%u.%u/%u.%u.%u.%u\n", | |
268 | NIPQUAD(src_ip), NIPQUAD(dst_ip), NIPQUAD(net_ip), NIPQUAD(netmask)); | |
269 | return; | |
270 | } | |
271 | ||
272 | // Check if this entry is new | |
fa9124c2 | 273 | char is_src_new_ip = 0, is_dst_new_ip = 0; |
ff4ee64d TJ |
274 | |
275 | // Calculate array positions | |
276 | unsigned char src_slot = (unsigned char)((src_ip&0xFF000000) >> 24); | |
277 | unsigned char dst_slot = (unsigned char)((dst_ip&0xFF000000) >> 24); | |
4068e14d TJ |
278 | |
279 | // Increase size counters | |
280 | if (is_src) | |
281 | { | |
282 | // Calculate network slot | |
5dbfa65d | 283 | DEBUGP("ACCOUNT: Calculated SRC 8 bit network slot: %d\n", src_slot); |
ff4ee64d | 284 | if (!mask_24->ip[src_slot].src_packets && !mask_24->ip[src_slot].dst_packets) |
fa9124c2 | 285 | is_src_new_ip = 1; |
4068e14d | 286 | |
ff4ee64d TJ |
287 | mask_24->ip[src_slot].src_packets++; |
288 | mask_24->ip[src_slot].src_bytes+=size; | |
4068e14d TJ |
289 | } |
290 | if (is_dst) | |
291 | { | |
5dbfa65d | 292 | DEBUGP("ACCOUNT: Calculated DST 8 bit network slot: %d\n", dst_slot); |
ff4ee64d | 293 | if (!mask_24->ip[dst_slot].src_packets && !mask_24->ip[dst_slot].dst_packets) |
fa9124c2 | 294 | is_dst_new_ip = 1; |
4068e14d | 295 | |
ff4ee64d TJ |
296 | mask_24->ip[dst_slot].dst_packets++; |
297 | mask_24->ip[dst_slot].dst_bytes+=size; | |
4068e14d TJ |
298 | } |
299 | ||
fa9124c2 | 300 | // Increase itemcounter |
4adc8355 | 301 | DEBUGP("ACCOUNT: Itemcounter before: %d\n", *itemcount); |
ff4ee64d | 302 | if (src_slot == dst_slot) |
fa9124c2 | 303 | { |
4adc8355 TJ |
304 | if (is_src_new_ip || is_dst_new_ip) { |
305 | DEBUGP("ACCOUNT: src_slot == dst_slot: %d, %d\n", is_src_new_ip, is_dst_new_ip); | |
fa9124c2 | 306 | (*itemcount)++; |
4adc8355 | 307 | } |
fa9124c2 | 308 | } else { |
4adc8355 TJ |
309 | if (is_src_new_ip) { |
310 | DEBUGP("ACCOUNT: New src_ip: %u.%u.%u.%u\n", NIPQUAD(src_ip)); | |
fa9124c2 | 311 | (*itemcount)++; |
4adc8355 TJ |
312 | } |
313 | if (is_dst_new_ip) { | |
314 | DEBUGP("ACCOUNT: New dst_ip: %u.%u.%u.%u\n", NIPQUAD(dst_ip)); | |
fa9124c2 | 315 | (*itemcount)++; |
4adc8355 | 316 | } |
fa9124c2 | 317 | } |
4adc8355 | 318 | DEBUGP("ACCOUNT: Itemcounter after: %d\n", *itemcount); |
4068e14d TJ |
319 | } |
320 | ||
321 | void ipt_account_depth1_insert(struct ipt_account_mask_16 *mask_16, unsigned int net_ip, unsigned int netmask, | |
322 | unsigned int src_ip, unsigned int dst_ip, unsigned int size, unsigned int *itemcount) | |
323 | { | |
324 | // Do we need to process src IP? | |
325 | if ((net_ip&netmask) == (src_ip&netmask)) | |
326 | { | |
327 | unsigned char slot = (unsigned char)((src_ip&0x00FF0000) >> 16); | |
328 | DEBUGP("ACCOUNT: Calculated SRC 16 bit network slot: %d\n", slot); | |
329 | ||
330 | // Do we need to create a new mask_24 bucket? | |
dbdd79c9 | 331 | if (!mask_16->mask_24[slot] && (mask_16->mask_24[slot] = (void *)get_zeroed_page(GFP_KERNEL)) == NULL) |
4068e14d TJ |
332 | { |
333 | printk("ACCOUNT: Can't process packet because out of memory!\n"); | |
334 | return; | |
335 | } | |
336 | ||
337 | ipt_account_depth0_insert((struct ipt_account_mask_24 *)mask_16->mask_24[slot], net_ip, netmask, | |
4adc8355 | 338 | src_ip, 0, size, itemcount); |
4068e14d TJ |
339 | } |
340 | ||
341 | // Do we need to process dst IP? | |
342 | if ((net_ip&netmask) == (dst_ip&netmask)) | |
343 | { | |
344 | unsigned char slot = (unsigned char)((dst_ip&0x00FF0000) >> 16); | |
345 | DEBUGP("ACCOUNT: Calculated DST 16 bit network slot: %d\n", slot); | |
346 | ||
347 | // Do we need to create a new mask_24 bucket? | |
dbdd79c9 | 348 | if (!mask_16->mask_24[slot] && (mask_16->mask_24[slot] = (void *)get_zeroed_page(GFP_KERNEL)) == NULL) |
4068e14d TJ |
349 | { |
350 | printk("ACCOUT: Can't process packet because out of memory!\n"); | |
351 | return; | |
352 | } | |
353 | ||
354 | ipt_account_depth0_insert((struct ipt_account_mask_24 *)mask_16->mask_24[slot], net_ip, netmask, | |
4adc8355 | 355 | 0, dst_ip, size, itemcount); |
4068e14d TJ |
356 | } |
357 | } | |
358 | ||
359 | void ipt_account_depth2_insert(struct ipt_account_mask_8 *mask_8, unsigned int net_ip, unsigned int netmask, | |
360 | unsigned int src_ip, unsigned int dst_ip, unsigned int size, unsigned int *itemcount) | |
361 | { | |
362 | // Do we need to process src IP? | |
363 | if ((net_ip&netmask) == (src_ip&netmask)) | |
364 | { | |
365 | unsigned char slot = (unsigned char)((src_ip&0x0000FF00) >> 8); | |
366 | DEBUGP("ACCOUNT: Calculated SRC 24 bit network slot: %d\n", slot); | |
367 | ||
368 | // Do we need to create a new mask_24 bucket? | |
dbdd79c9 | 369 | if (!mask_8->mask_16[slot] && (mask_8->mask_16[slot] = (void *)get_zeroed_page(GFP_KERNEL)) == NULL) |
4068e14d TJ |
370 | { |
371 | printk("ACCOUNT: Can't process packet because out of memory!\n"); | |
372 | return; | |
373 | } | |
374 | ||
375 | ipt_account_depth1_insert((struct ipt_account_mask_16 *)mask_8->mask_16[slot], net_ip, netmask, | |
4adc8355 | 376 | src_ip, 0, size, itemcount); |
4068e14d TJ |
377 | } |
378 | ||
379 | // Do we need to process dst IP? | |
380 | if ((net_ip&netmask) == (dst_ip&netmask)) | |
381 | { | |
382 | unsigned char slot = (unsigned char)((dst_ip&0x0000FF00) >> 8); | |
383 | DEBUGP("ACCOUNT: Calculated DST 24 bit network slot: %d\n", slot); | |
384 | ||
385 | // Do we need to create a new mask_24 bucket? | |
dbdd79c9 | 386 | if (!mask_8->mask_16[slot] && (mask_8->mask_16[slot] = (void *)get_zeroed_page(GFP_KERNEL)) == NULL) |
4068e14d TJ |
387 | { |
388 | printk("ACCOUNT: Can't process packet because out of memory!\n"); | |
389 | return; | |
390 | } | |
391 | ||
392 | ipt_account_depth1_insert((struct ipt_account_mask_16 *)mask_8->mask_16[slot], net_ip, netmask, | |
4adc8355 | 393 | 0, dst_ip, size, itemcount); |
4068e14d TJ |
394 | } |
395 | } | |
396 | ||
397 | static unsigned int ipt_account_target(struct sk_buff **pskb, | |
398 | unsigned int hooknum, | |
399 | const struct net_device *in, | |
400 | const struct net_device *out, | |
401 | const void *targinfo, | |
402 | void *userinfo) | |
403 | { | |
404 | const struct ipt_account_info *info = (const struct ipt_account_info *)targinfo; | |
405 | unsigned int src_ip = (*pskb)->nh.iph->saddr; | |
406 | unsigned int dst_ip = (*pskb)->nh.iph->daddr; | |
407 | unsigned int size = ntohs((*pskb)->nh.iph->tot_len); | |
408 | ||
409 | spin_lock_bh(&ipt_account_lock); | |
410 | ||
411 | if (ipt_account_tables[info->table_nr].name[0] == 0) | |
412 | { | |
413 | printk("ACCOUNT: ipt_account_target: Invalid table id %u. IPs %u.%u.%u.%u/%u.%u.%u.%u\n", | |
414 | info->table_nr, NIPQUAD(src_ip), NIPQUAD(dst_ip)); | |
415 | spin_unlock_bh(&ipt_account_lock); | |
416 | return IPT_CONTINUE; | |
417 | } | |
418 | ||
419 | // 8 bit network or "any" network | |
420 | if (ipt_account_tables[info->table_nr].depth == 0) | |
421 | { | |
422 | // Count packet and check if the IP is new | |
423 | ipt_account_depth0_insert((struct ipt_account_mask_24 *)ipt_account_tables[info->table_nr].data, | |
424 | ipt_account_tables[info->table_nr].ip, ipt_account_tables[info->table_nr].netmask, | |
425 | src_ip, dst_ip, size, &ipt_account_tables[info->table_nr].itemcount); | |
426 | spin_unlock_bh(&ipt_account_lock); | |
427 | return IPT_CONTINUE; | |
428 | } | |
429 | ||
430 | // 16 bit network | |
431 | if (ipt_account_tables[info->table_nr].depth == 1) | |
432 | { | |
433 | ipt_account_depth1_insert((struct ipt_account_mask_16 *)ipt_account_tables[info->table_nr].data, | |
434 | ipt_account_tables[info->table_nr].ip, ipt_account_tables[info->table_nr].netmask, | |
435 | src_ip, dst_ip, size, &ipt_account_tables[info->table_nr].itemcount); | |
436 | spin_unlock_bh(&ipt_account_lock); | |
437 | return IPT_CONTINUE; | |
438 | } | |
439 | ||
440 | // 24 bit network | |
441 | if (ipt_account_tables[info->table_nr].depth == 2) | |
442 | { | |
443 | ipt_account_depth2_insert((struct ipt_account_mask_8 *)ipt_account_tables[info->table_nr].data, | |
444 | ipt_account_tables[info->table_nr].ip, ipt_account_tables[info->table_nr].netmask, | |
445 | src_ip, dst_ip, size, &ipt_account_tables[info->table_nr].itemcount); | |
446 | spin_unlock_bh(&ipt_account_lock); | |
447 | return IPT_CONTINUE; | |
448 | } | |
449 | ||
450 | printk("ACCOUNT: ipt_account_target: Unable to process packet. Table id %u. IPs %u.%u.%u.%u/%u.%u.%u.%u\n", | |
451 | info->table_nr, NIPQUAD(src_ip), NIPQUAD(dst_ip)); | |
452 | ||
453 | spin_unlock_bh(&ipt_account_lock); | |
454 | return IPT_CONTINUE; | |
455 | } | |
456 | ||
bea3921b TJ |
457 | /* |
458 | Functions dealing with "handles": | |
459 | Handles are snapshots of a accounting state. | |
460 | ||
461 | read snapshots are only for debugging the code | |
462 | and are very expensive concerning speed/memory | |
463 | compared to read_and_flush. | |
464 | ||
465 | The functions aren't protected by spinlocks themselves | |
466 | as this is done in the ioctl part of the code. | |
467 | */ | |
468 | ||
469 | /* | |
470 | Find a free handle slot. Normally only one should be used, | |
471 | but there could be two or more applications accessing the data | |
472 | at the same time. | |
473 | */ | |
474 | int ipt_account_handle_find_slot(void) | |
475 | { | |
476 | unsigned int i; | |
477 | // Insert new table | |
478 | for (i = 0; i < ACCOUNT_MAX_HANDLES; i++) | |
479 | { | |
480 | // Found free slot | |
481 | if (ipt_account_handles[i].data == NULL) | |
482 | { | |
483 | // Don't "mark" data as used as we are protected by a spinlock by the calling function. | |
484 | // handle_find_slot() is only a function to prevent code duplication. | |
485 | return i; | |
486 | } | |
487 | } | |
488 | ||
489 | // No free slot found | |
490 | printk("ACCOUNT: No free handle slot found (max: %u). Please increase ACCOUNT_MAX_HANDLES.\n", ACCOUNT_MAX_HANDLES); | |
491 | return -1; | |
492 | } | |
493 | ||
494 | int ipt_account_handle_free(unsigned int handle) | |
495 | { | |
496 | if (handle >= ACCOUNT_MAX_HANDLES) | |
497 | { | |
498 | printk("ACCOUNT: Invalid handle for ipt_account_handle_free() specified: %u\n", handle); | |
499 | return -EINVAL; | |
500 | } | |
501 | ||
502 | ipt_account_data_free(ipt_account_handles[handle].data, ipt_account_handles[handle].depth); | |
503 | memset (&ipt_account_handles[handle], 0, sizeof (struct ipt_account_handle)); | |
504 | return 0; | |
505 | } | |
506 | ||
507 | /* Prepare data for read without flush. Use only for debugging! | |
508 | Real applications should use read&flush as it's way more efficent */ | |
509 | int ipt_account_handle_prepare_read(char *tablename, unsigned int *count) | |
510 | { | |
511 | int handle, i, table_nr=-1; | |
512 | ||
513 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) | |
514 | if (strncmp(ipt_account_tables[i].name, tablename, ACCOUNT_TABLE_NAME_LEN) == 0) | |
515 | { | |
516 | table_nr = i; | |
517 | break; | |
518 | } | |
519 | ||
520 | if (table_nr == -1) | |
521 | { | |
522 | printk("ACCOUNT: ipt_account_handle_prepare_read(): Table %s not found\n", tablename); | |
523 | return -1; | |
524 | } | |
525 | ||
526 | // Can't find a free handle slot? | |
527 | if ((handle = ipt_account_handle_find_slot()) == -1) | |
528 | return -1; | |
529 | ||
530 | // Fill up handle structure | |
531 | ipt_account_handles[handle].ip = ipt_account_tables[table_nr].ip; | |
532 | ipt_account_handles[handle].depth = ipt_account_tables[table_nr].depth; | |
533 | ipt_account_handles[handle].itemcount = ipt_account_tables[table_nr].itemcount; | |
534 | ||
535 | // allocate "root" table | |
dbdd79c9 | 536 | if ((ipt_account_handles[handle].data = (void*)get_zeroed_page(GFP_KERNEL)) == NULL) |
bea3921b TJ |
537 | { |
538 | printk("ACCOUNT: out of memory for root table in ipt_account_handle_prepare_read()\n"); | |
539 | memset (&ipt_account_handles[handle], 0, sizeof(struct ipt_account_handle)); | |
540 | return -1; | |
541 | } | |
542 | ||
543 | // Recursive copy of complete data structure | |
544 | unsigned int depth = ipt_account_handles[handle].depth; | |
545 | if (depth == 0) | |
546 | { | |
547 | memcpy(ipt_account_handles[handle].data, ipt_account_tables[table_nr].data, sizeof(struct ipt_account_mask_24)); | |
548 | } else if (depth == 1) { | |
549 | struct ipt_account_mask_16 *src_16 = (struct ipt_account_mask_16 *)ipt_account_tables[table_nr].data; | |
550 | struct ipt_account_mask_16 *network_16 = (struct ipt_account_mask_16 *)ipt_account_handles[handle].data; | |
4adc8355 | 551 | unsigned int b; |
bea3921b | 552 | |
4adc8355 | 553 | for (b = 0; b <= 255; b++) |
bea3921b TJ |
554 | { |
555 | if (src_16->mask_24[b]) | |
556 | { | |
dbdd79c9 | 557 | if ((network_16->mask_24[b] = (void*)get_zeroed_page(GFP_KERNEL)) == NULL) |
bea3921b TJ |
558 | { |
559 | printk("ACCOUNT: out of memory during copy of 16 bit network in ipt_account_handle_prepare_read()\n"); | |
560 | ipt_account_data_free(ipt_account_handles[handle].data, depth); | |
561 | memset (&ipt_account_handles[handle], 0, sizeof(struct ipt_account_handle)); | |
562 | return -1; | |
563 | } | |
564 | ||
565 | memcpy(network_16->mask_24[b], src_16->mask_24[b], sizeof(struct ipt_account_mask_24)); | |
566 | } | |
567 | } | |
568 | } else if(depth == 2) { | |
569 | struct ipt_account_mask_8 *src_8 = (struct ipt_account_mask_8 *)ipt_account_tables[table_nr].data; | |
570 | struct ipt_account_mask_8 *network_8 = (struct ipt_account_mask_8 *)ipt_account_handles[handle].data; | |
4adc8355 | 571 | unsigned int a; |
bea3921b | 572 | |
4adc8355 | 573 | for (a = 0; a <= 255; a++) |
bea3921b TJ |
574 | { |
575 | if (src_8->mask_16[a]) | |
576 | { | |
dbdd79c9 | 577 | if ((network_8->mask_16[a] = (void*)get_zeroed_page(GFP_KERNEL)) == NULL) |
bea3921b TJ |
578 | { |
579 | printk("ACCOUNT: out of memory during copy of 24 bit network in ipt_account_handle_prepare_read()\n"); | |
580 | ipt_account_data_free(ipt_account_handles[handle].data, depth); | |
581 | memset (&ipt_account_handles[handle], 0, sizeof(struct ipt_account_handle)); | |
582 | return -1; | |
583 | } | |
584 | ||
585 | memcpy(network_8->mask_16[a], src_8->mask_16[a], sizeof(struct ipt_account_mask_16)); | |
586 | ||
587 | struct ipt_account_mask_16 *src_16 = src_8->mask_16[a]; | |
588 | struct ipt_account_mask_16 *network_16 = network_8->mask_16[a]; | |
4adc8355 | 589 | unsigned int b; |
bea3921b | 590 | |
4adc8355 | 591 | for (b = 0; b <= 255; b++) |
bea3921b TJ |
592 | { |
593 | if (src_16->mask_24[b]) | |
594 | { | |
dbdd79c9 | 595 | if ((network_16->mask_24[b] = (void*)get_zeroed_page(GFP_KERNEL)) == NULL) |
bea3921b TJ |
596 | { |
597 | printk("ACCOUNT: out of memory during copy of 16 bit network in ipt_account_handle_prepare_read()\n"); | |
598 | ipt_account_data_free(ipt_account_handles[handle].data, depth); | |
599 | memset (&ipt_account_handles[handle], 0, sizeof(struct ipt_account_handle)); | |
600 | return -1; | |
601 | } | |
602 | ||
603 | memcpy(network_16->mask_24[b], src_16->mask_24[b], sizeof(struct ipt_account_mask_24)); | |
604 | } | |
605 | } | |
606 | } | |
607 | } | |
608 | } | |
609 | ||
610 | *count = ipt_account_tables[table_nr].itemcount; | |
611 | return handle; | |
612 | } | |
613 | ||
614 | /* Prepare data for read and flush it */ | |
615 | int ipt_account_handle_prepare_read_flush(char *tablename, unsigned int *count) | |
616 | { | |
617 | int handle, i, table_nr=-1; | |
618 | ||
619 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) | |
620 | if (strncmp(ipt_account_tables[i].name, tablename, ACCOUNT_TABLE_NAME_LEN) == 0) | |
621 | { | |
622 | table_nr = i; | |
623 | break; | |
624 | } | |
625 | ||
626 | if (table_nr == -1) | |
627 | { | |
628 | printk("ACCOUNT: ipt_account_handle_prepare_read_flush(): Table %s not found\n", tablename); | |
629 | return -1; | |
630 | } | |
631 | ||
632 | // Can't find a free handle slot? | |
633 | if ((handle = ipt_account_handle_find_slot()) == -1) | |
634 | return -1; | |
635 | ||
636 | // Fill up handle structure | |
637 | ipt_account_handles[handle].ip = ipt_account_tables[table_nr].ip; | |
638 | ipt_account_handles[handle].depth = ipt_account_tables[table_nr].depth; | |
639 | ipt_account_handles[handle].itemcount = ipt_account_tables[table_nr].itemcount; | |
640 | ipt_account_handles[handle].data = ipt_account_tables[table_nr].data; | |
641 | *count = ipt_account_tables[table_nr].itemcount; | |
642 | ||
643 | // "Flush" table data | |
644 | ipt_account_tables[table_nr].data = (void*)get_zeroed_page(GFP_KERNEL); | |
645 | ipt_account_tables[table_nr].itemcount = 0; | |
646 | ||
647 | return handle; | |
648 | } | |
649 | ||
650 | /* Copy the actual that into a prepared buffer. | |
651 | We only copy entries != 0 to increase performance. | |
652 | The memory gets freed again in ipt_account_handle_free(). | |
653 | */ | |
654 | int ipt_account_handle_get_data(unsigned int handle, void *buffer) | |
655 | { | |
656 | struct ipt_account_handle_ip handle_ip; | |
657 | unsigned int handle_ip_size = sizeof (struct ipt_account_handle_ip); | |
9c44d30e | 658 | unsigned int i, tmpbuf_pos=0; |
bea3921b TJ |
659 | |
660 | if (handle >= ACCOUNT_MAX_HANDLES) | |
661 | { | |
662 | printk("ACCOUNT: invalid handle for ipt_account_handle_get_data() specified: %u\n", handle); | |
663 | return -1; | |
664 | } | |
665 | ||
666 | if (ipt_account_handles[handle].data == NULL) | |
667 | { | |
668 | printk("ACCOUNT: handle %u is BROKEN: Contains no data\n", handle); | |
669 | return -1; | |
670 | } | |
671 | ||
bea3921b TJ |
672 | unsigned int net_ip = ipt_account_handles[handle].ip; |
673 | unsigned int depth = ipt_account_handles[handle].depth; | |
674 | ||
675 | // 8 bit network | |
676 | if (depth == 0) | |
677 | { | |
678 | struct ipt_account_mask_24 *network = (struct ipt_account_mask_24*)ipt_account_handles[handle].data; | |
4adc8355 | 679 | for (i = 0; i <= 255; i++) |
bea3921b TJ |
680 | { |
681 | if (network->ip[i].src_packets || network->ip[i].dst_packets) | |
682 | { | |
683 | handle_ip.ip = net_ip | (i<<24); | |
684 | handle_ip.src_packets = network->ip[i].src_packets; | |
685 | handle_ip.src_bytes = network->ip[i].src_bytes; | |
686 | handle_ip.dst_packets = network->ip[i].dst_packets; | |
687 | handle_ip.dst_bytes = network->ip[i].dst_bytes; | |
688 | ||
9c44d30e TJ |
689 | // Temporary buffer full? Flush to userspace |
690 | if (tmpbuf_pos+handle_ip_size >= PAGE_SIZE) | |
691 | { | |
692 | copy_to_user(buffer, ipt_account_tmpbuf, tmpbuf_pos); | |
693 | tmpbuf_pos = 0; | |
694 | } | |
695 | memcpy(ipt_account_tmpbuf+tmpbuf_pos, &handle_ip, handle_ip_size); | |
696 | tmpbuf_pos += handle_ip_size; | |
bea3921b TJ |
697 | } |
698 | } | |
9c44d30e TJ |
699 | |
700 | // Flush remaining data to userspace | |
701 | if (tmpbuf_pos) | |
702 | copy_to_user(buffer, ipt_account_tmpbuf, tmpbuf_pos); | |
bea3921b TJ |
703 | |
704 | return 0; | |
705 | } | |
706 | ||
707 | // 16 bit network | |
708 | if (depth == 1) | |
709 | { | |
710 | struct ipt_account_mask_16 *network_16 = (struct ipt_account_mask_16*)ipt_account_handles[handle].data; | |
4adc8355 TJ |
711 | unsigned int b; |
712 | for (b = 0; b <= 255; b++) | |
bea3921b TJ |
713 | { |
714 | if (network_16->mask_24[b]) | |
715 | { | |
716 | struct ipt_account_mask_24 *network = (struct ipt_account_mask_24*)network_16->mask_24[b]; | |
4adc8355 | 717 | for (i = 0; i <= 255; i++) |
bea3921b TJ |
718 | { |
719 | if (network->ip[i].src_packets || network->ip[i].dst_packets) | |
720 | { | |
721 | handle_ip.ip = net_ip | (b << 16) | (i<<24); | |
722 | handle_ip.src_packets = network->ip[i].src_packets; | |
723 | handle_ip.src_bytes = network->ip[i].src_bytes; | |
724 | handle_ip.dst_packets = network->ip[i].dst_packets; | |
725 | handle_ip.dst_bytes = network->ip[i].dst_bytes; | |
726 | ||
9c44d30e TJ |
727 | // Temporary buffer full? Flush to userspace |
728 | if (tmpbuf_pos+handle_ip_size >= PAGE_SIZE) | |
729 | { | |
730 | copy_to_user(buffer, ipt_account_tmpbuf, tmpbuf_pos); | |
731 | tmpbuf_pos = 0; | |
732 | } | |
733 | memcpy(ipt_account_tmpbuf+tmpbuf_pos, &handle_ip, handle_ip_size); | |
734 | tmpbuf_pos += handle_ip_size; | |
bea3921b TJ |
735 | } |
736 | } | |
737 | } | |
738 | } | |
739 | ||
9c44d30e TJ |
740 | // Flush remaining data to userspace |
741 | if (tmpbuf_pos) | |
742 | copy_to_user(buffer, ipt_account_tmpbuf, tmpbuf_pos); | |
743 | ||
bea3921b TJ |
744 | return 0; |
745 | } | |
746 | ||
747 | // 24 bit network | |
748 | if (depth == 2) | |
749 | { | |
750 | struct ipt_account_mask_8 *network_8 = (struct ipt_account_mask_8*)ipt_account_handles[handle].data; | |
4adc8355 TJ |
751 | unsigned int a, b; |
752 | for (a = 0; a <= 255; a++) | |
bea3921b TJ |
753 | { |
754 | if (network_8->mask_16[a]) | |
755 | { | |
756 | struct ipt_account_mask_16 *network_16 = (struct ipt_account_mask_16*)network_8->mask_16[a]; | |
4adc8355 | 757 | for (b = 0; b <= 255; b++) |
bea3921b TJ |
758 | { |
759 | if (network_16->mask_24[b]) | |
760 | { | |
761 | struct ipt_account_mask_24 *network = (struct ipt_account_mask_24*)network_16->mask_24[b]; | |
4adc8355 | 762 | for (i = 0; i <= 255; i++) |
bea3921b TJ |
763 | { |
764 | if (network->ip[i].src_packets || network->ip[i].dst_packets) | |
765 | { | |
766 | handle_ip.ip = net_ip | (a << 8) | (b << 16) | (i<<24); | |
767 | handle_ip.src_packets = network->ip[i].src_packets; | |
768 | handle_ip.src_bytes = network->ip[i].src_bytes; | |
769 | handle_ip.dst_packets = network->ip[i].dst_packets; | |
770 | handle_ip.dst_bytes = network->ip[i].dst_bytes; | |
771 | ||
9c44d30e TJ |
772 | // Temporary buffer full? Flush to userspace |
773 | if (tmpbuf_pos+handle_ip_size >= PAGE_SIZE) | |
774 | { | |
775 | copy_to_user(buffer, ipt_account_tmpbuf, tmpbuf_pos); | |
776 | tmpbuf_pos = 0; | |
777 | } | |
778 | memcpy(ipt_account_tmpbuf+tmpbuf_pos, &handle_ip, handle_ip_size); | |
779 | tmpbuf_pos += handle_ip_size; | |
bea3921b TJ |
780 | } |
781 | } | |
782 | } | |
783 | } | |
784 | } | |
785 | } | |
786 | ||
9c44d30e TJ |
787 | // Flush remaining data to userspace |
788 | if (tmpbuf_pos) | |
789 | copy_to_user(buffer, ipt_account_tmpbuf, tmpbuf_pos); | |
790 | ||
bea3921b TJ |
791 | return 0; |
792 | } | |
9c44d30e | 793 | |
bea3921b TJ |
794 | return -1; |
795 | } | |
796 | ||
797 | static int ipt_account_set_ctl(struct sock *sk, int cmd, void *user, unsigned int len) | |
798 | { | |
799 | struct ipt_account_handle_sockopt handle; | |
800 | int ret = -EINVAL; | |
801 | ||
802 | if (!capable(CAP_NET_ADMIN)) | |
803 | return -EPERM; | |
804 | ||
805 | switch (cmd) | |
806 | { | |
807 | case IPT_SO_SET_ACCOUNT_HANDLE_FREE: | |
808 | if (len != sizeof(struct ipt_account_handle_sockopt)) | |
809 | { | |
810 | 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)); | |
811 | break; | |
812 | } | |
813 | ||
814 | if (copy_from_user (&handle, user, len)) | |
815 | { | |
816 | printk("ACCOUNT: ipt_account_set_ctl: copy_from_user failed for IPT_SO_SET_HANDLE_FREE\n"); | |
817 | break; | |
818 | } | |
819 | ||
9c44d30e | 820 | spin_lock_bh(&ipt_account_userspace_lock); |
bea3921b | 821 | ret = ipt_account_handle_free(handle.handle_nr); |
9c44d30e | 822 | spin_unlock_bh(&ipt_account_userspace_lock); |
bea3921b | 823 | break; |
5b15c288 TJ |
824 | case IPT_SO_SET_ACCOUNT_HANDLE_FREE_ALL: |
825 | { | |
826 | unsigned int i; | |
827 | spin_lock_bh(&ipt_account_userspace_lock); | |
828 | for (i = 0; i < ACCOUNT_MAX_HANDLES; i++) | |
829 | ipt_account_handle_free(i); | |
830 | spin_unlock_bh(&ipt_account_userspace_lock); | |
831 | ret = 0; | |
832 | break; | |
833 | } | |
bea3921b TJ |
834 | default: |
835 | printk("ACCOUNT: ipt_account_set_ctl: unknown request %i\n", cmd); | |
836 | } | |
837 | ||
838 | return ret; | |
839 | } | |
840 | ||
841 | static int ipt_account_get_ctl(struct sock *sk, int cmd, void *user, int *len) | |
842 | { | |
843 | struct ipt_account_handle_sockopt handle; | |
844 | int ret = -EINVAL; | |
845 | ||
846 | if (!capable(CAP_NET_ADMIN)) | |
847 | return -EPERM; | |
848 | ||
849 | switch (cmd) | |
850 | { | |
851 | case IPT_SO_GET_ACCOUNT_PREPARE_READ_FLUSH: | |
852 | case IPT_SO_GET_ACCOUNT_PREPARE_READ: | |
853 | if (*len < sizeof(struct ipt_account_handle_sockopt)) | |
854 | { | |
855 | printk("ACCOUNT: ipt_account_get_ctl: wrong data size (%u != %u) for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n", | |
856 | *len, sizeof(struct ipt_account_handle_sockopt)); | |
857 | break; | |
858 | } | |
859 | ||
860 | if (copy_from_user (&handle, user, sizeof(struct ipt_account_handle_sockopt))) | |
861 | { | |
862 | printk("ACCOUNT: ipt_account_get_ctl: copy_from_user failed for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n"); | |
863 | break; | |
864 | } | |
865 | ||
866 | spin_lock_bh(&ipt_account_lock); | |
9c44d30e | 867 | spin_lock_bh(&ipt_account_userspace_lock); |
bea3921b TJ |
868 | if (cmd == IPT_SO_GET_ACCOUNT_PREPARE_READ_FLUSH) |
869 | handle.handle_nr = ipt_account_handle_prepare_read_flush(handle.name, &handle.itemcount); | |
870 | else | |
871 | handle.handle_nr = ipt_account_handle_prepare_read(handle.name, &handle.itemcount); | |
9c44d30e | 872 | spin_unlock_bh(&ipt_account_userspace_lock); |
bea3921b TJ |
873 | spin_unlock_bh(&ipt_account_lock); |
874 | ||
875 | if (handle.handle_nr == -1) | |
876 | { | |
877 | printk("ACCOUNT: ipt_account_get_ctl: ipt_account_handle_prepare_read failed\n"); | |
878 | break; | |
879 | } | |
880 | ||
881 | if (copy_to_user(user, &handle, sizeof(struct ipt_account_handle_sockopt))) | |
882 | { | |
883 | printk("ACCOUNT: ipt_account_set_ctl: copy_to_user failed for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n"); | |
884 | break; | |
885 | } | |
886 | ret = 0; | |
887 | break; | |
888 | case IPT_SO_GET_ACCOUNT_GET_DATA: | |
889 | if (*len < sizeof(struct ipt_account_handle_sockopt)) | |
890 | { | |
891 | printk("ACCOUNT: ipt_account_get_ctl: wrong data size (%u != %u) for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n", | |
892 | *len, sizeof(struct ipt_account_handle_sockopt)); | |
893 | break; | |
894 | } | |
895 | ||
896 | if (copy_from_user (&handle, user, sizeof(struct ipt_account_handle_sockopt))) | |
897 | { | |
898 | printk("ACCOUNT: ipt_account_get_ctl: copy_from_user failed for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n"); | |
899 | break; | |
900 | } | |
901 | ||
902 | if (handle.handle_nr >= ACCOUNT_MAX_HANDLES) | |
903 | { | |
904 | printk("ACCOUNT: Invalid handle for IPT_SO_GET_ACCOUNT_GET_DATA: %u\n", handle.handle_nr); | |
905 | break; | |
906 | } | |
907 | ||
908 | if (*len < ipt_account_handles[handle.handle_nr].itemcount*sizeof(struct ipt_account_handle_ip)) | |
909 | { | |
910 | printk("ACCOUNT: ipt_account_get_ctl: not enough space (%u < %u) to store data from IPT_SO_GET_ACCOUNT_GET_DATA\n", | |
911 | *len, ipt_account_handles[handle.handle_nr].itemcount*sizeof(struct ipt_account_handle_ip)); | |
5b15c288 | 912 | ret = -ENOMEM; |
bea3921b TJ |
913 | break; |
914 | } | |
915 | ||
9c44d30e | 916 | spin_lock_bh(&ipt_account_userspace_lock); |
bea3921b | 917 | ret = ipt_account_handle_get_data(handle.handle_nr, user); |
9c44d30e | 918 | spin_unlock_bh(&ipt_account_userspace_lock); |
bea3921b TJ |
919 | if (ret) |
920 | { | |
921 | printk("ACCOUNT: ipt_account_get_ctl: ipt_account_handle_get_data failed for handle %u\n", handle.handle_nr); | |
922 | break; | |
923 | } | |
924 | ||
925 | ret = 0; | |
926 | break; | |
5b15c288 TJ |
927 | case IPT_SO_GET_ACCOUNT_GET_HANDLE_USAGE: |
928 | { | |
929 | if (*len < sizeof(struct ipt_account_handle_sockopt)) | |
930 | { | |
931 | printk("ACCOUNT: ipt_account_get_ctl: wrong data size (%u != %u) for IPT_SO_GET_ACCOUNT_GET_HANDLE_USAGE\n", | |
932 | *len, sizeof(struct ipt_account_handle_sockopt)); | |
933 | break; | |
934 | } | |
935 | ||
936 | // Find out how many handles are in use | |
937 | unsigned int i; | |
938 | handle.itemcount = 0; | |
939 | spin_lock_bh(&ipt_account_userspace_lock); | |
940 | for (i = 0; i < ACCOUNT_MAX_HANDLES; i++) | |
941 | if (ipt_account_handles[i].data) | |
942 | handle.itemcount++; | |
943 | spin_unlock_bh(&ipt_account_userspace_lock); | |
944 | ||
945 | if (copy_to_user(user, &handle, sizeof(struct ipt_account_handle_sockopt))) | |
946 | { | |
947 | printk("ACCOUNT: ipt_account_set_ctl: copy_to_user failed for IPT_SO_GET_ACCOUNT_GET_HANDLE_USAGE\n"); | |
948 | break; | |
949 | } | |
950 | ret = 0; | |
951 | break; | |
952 | } | |
953 | case IPT_SO_GET_ACCOUNT_GET_TABLE_NAMES: | |
954 | { | |
955 | spin_lock_bh(&ipt_account_lock); | |
956 | ||
957 | // Determine size of table names | |
958 | unsigned int size = 0, i; | |
959 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) | |
960 | { | |
961 | if (ipt_account_tables[i].name[0] != 0) | |
962 | size += strlen (ipt_account_tables[i].name) + 1; | |
963 | } | |
964 | size += 1; // Terminating NULL character | |
965 | ||
966 | if (*len < size) | |
967 | { | |
968 | spin_unlock_bh(&ipt_account_lock); | |
969 | printk("ACCOUNT: ipt_account_get_ctl: not enough space (%u < %u) to store table names\n", *len, size); | |
970 | ret = -ENOMEM; | |
971 | break; | |
972 | } | |
973 | // Copy table names to userspace | |
974 | char *tnames = user; | |
975 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) | |
976 | { | |
977 | if (ipt_account_tables[i].name[0] != 0) | |
978 | { | |
979 | int len = strlen (ipt_account_tables[i].name) + 1; | |
980 | copy_to_user(tnames, ipt_account_tables[i].name, len); // copy string + terminating zero | |
981 | tnames += len; | |
982 | } | |
983 | } | |
984 | // Append terminating zero | |
985 | i = 0; | |
986 | copy_to_user(tnames, &i, 1); | |
987 | spin_unlock_bh(&ipt_account_lock); | |
988 | ret = 0; | |
989 | break; | |
990 | } | |
bea3921b TJ |
991 | default: |
992 | printk("ACCOUNT: ipt_account_get_ctl: unknown request %i\n", cmd); | |
993 | } | |
994 | ||
995 | return ret; | |
996 | } | |
997 | ||
70288420 | 998 | static struct ipt_target ipt_account_reg |
850cece6 | 999 | = { { NULL, NULL }, "ACCOUNT", ipt_account_target, ipt_account_checkentry, ipt_account_deleteentry, |
70288420 TJ |
1000 | THIS_MODULE }; |
1001 | ||
bea3921b TJ |
1002 | static struct nf_sockopt_ops ipt_account_sockopts |
1003 | = { { NULL, NULL }, PF_INET, IPT_SO_SET_ACCOUNT_HANDLE_FREE, IPT_SO_SET_ACCOUNT_MAX+1, ipt_account_set_ctl, | |
1004 | IPT_SO_GET_ACCOUNT_PREPARE_READ, IPT_SO_GET_ACCOUNT_MAX+1, ipt_account_get_ctl, 0, NULL }; | |
1005 | ||
70288420 TJ |
1006 | static int __init init(void) |
1007 | { | |
bea3921b TJ |
1008 | if (PAGE_SIZE < 4096) |
1009 | { | |
1010 | printk("ACCOUNT: Sorry we need at least a PAGE_SIZE of 4096. Found: %lu\n", PAGE_SIZE); | |
1011 | return -EINVAL; | |
1012 | } | |
1013 | ||
dbdd79c9 | 1014 | if ((ipt_account_tables = kmalloc(ACCOUNT_MAX_TABLES*sizeof(struct ipt_account_table), GFP_KERNEL)) == NULL) |
70288420 | 1015 | { |
bea3921b TJ |
1016 | printk("ACCOUNT: Out of memory allocating account_tables structure"); |
1017 | return -EINVAL; | |
70288420 | 1018 | } |
850cece6 | 1019 | memset(ipt_account_tables, 0, ACCOUNT_MAX_TABLES*sizeof(struct ipt_account_table)); |
70288420 | 1020 | |
dbdd79c9 | 1021 | if ((ipt_account_handles = kmalloc(ACCOUNT_MAX_HANDLES*sizeof(struct ipt_account_handle), GFP_KERNEL)) == NULL) |
70288420 | 1022 | { |
bea3921b TJ |
1023 | printk("ACCOUNT: Out of memory allocating account_handles structure"); |
1024 | kfree (ipt_account_tables); | |
1025 | ipt_account_tables = NULL; | |
1026 | return -EINVAL; | |
70288420 | 1027 | } |
850cece6 | 1028 | memset(ipt_account_handles, 0, ACCOUNT_MAX_HANDLES*sizeof(struct ipt_account_handle)); |
bea3921b | 1029 | |
9c44d30e TJ |
1030 | // Allocate one page as temporary storage |
1031 | if ((ipt_account_tmpbuf = (void*)__get_free_page(GFP_KERNEL)) == NULL) | |
1032 | { | |
1033 | printk("ACCOUNT: Out of memory for temporary buffer page\n"); | |
dbdd79c9 TJ |
1034 | kfree(ipt_account_tables); |
1035 | kfree(ipt_account_handles); | |
9c44d30e TJ |
1036 | ipt_account_tables = NULL; |
1037 | ipt_account_handles = NULL; | |
1038 | return -EINVAL; | |
1039 | } | |
1040 | ||
bea3921b TJ |
1041 | /* Register setsockopt */ |
1042 | if (nf_register_sockopt(&ipt_account_sockopts) < 0) | |
1043 | { | |
1044 | printk("ACCOUNT: Can't register sockopts. Aborting\n"); | |
1045 | ||
dbdd79c9 | 1046 | kfree(ipt_account_tables); |
bea3921b | 1047 | kfree(ipt_account_handles); |
5b15c288 | 1048 | free_page((unsigned long)ipt_account_tmpbuf); |
dbdd79c9 | 1049 | ipt_account_tables = NULL; |
bea3921b | 1050 | ipt_account_handles = NULL; |
dbdd79c9 | 1051 | ipt_account_tmpbuf = NULL; |
bea3921b TJ |
1052 | |
1053 | return -EINVAL; | |
1054 | } | |
70288420 TJ |
1055 | |
1056 | if (ipt_register_target(&ipt_account_reg)) | |
1057 | return -EINVAL; | |
1058 | ||
1059 | return 0; | |
1060 | } | |
1061 | ||
1062 | static void __exit fini(void) | |
1063 | { | |
1064 | ipt_unregister_target(&ipt_account_reg); | |
1065 | ||
bea3921b TJ |
1066 | nf_unregister_sockopt(&ipt_account_sockopts); |
1067 | ||
70288420 | 1068 | kfree(ipt_account_tables); |
70288420 | 1069 | kfree(ipt_account_handles); |
5b15c288 | 1070 | free_page((unsigned long)ipt_account_tmpbuf); |
dbdd79c9 TJ |
1071 | |
1072 | ipt_account_tables = NULL; | |
70288420 | 1073 | ipt_account_handles = NULL; |
dbdd79c9 | 1074 | ipt_account_tmpbuf = NULL; |
70288420 TJ |
1075 | } |
1076 | ||
1077 | module_init(init); | |
1078 | module_exit(fini); | |
1079 | MODULE_LICENSE("GPL"); |