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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> | |
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 | 33 | |
ad773892 TJ |
34 | #if (PAGE_SIZE < 4096) |
35 | #error "ipt_ACCOUNT needs at least a PAGE_SIZE of 4096" | |
36 | #endif | |
37 | ||
70288420 TJ |
38 | struct ipt_account_table *ipt_account_tables = NULL; |
39 | struct ipt_account_handle *ipt_account_handles = NULL; | |
9c44d30e | 40 | void *ipt_account_tmpbuf = NULL; |
70288420 | 41 | |
2ea7a43c | 42 | /* Spinlock used for manipulating the current accounting tables/data */ |
70288420 | 43 | static spinlock_t ipt_account_lock = SPIN_LOCK_UNLOCKED; |
2ea7a43c | 44 | /* Spinlock used for manipulating userspace handles/snapshot data */ |
9c44d30e TJ |
45 | static spinlock_t ipt_account_userspace_lock = SPIN_LOCK_UNLOCKED; |
46 | ||
70288420 | 47 | |
70288420 | 48 | /* Recursive free of all data structures */ |
2ea7a43c TJ |
49 | void ipt_account_data_free(void *data, unsigned char depth) { |
50 | /* Empty data set */ | |
70288420 TJ |
51 | if (!data) |
52 | return; | |
2ea7a43c | 53 | |
06817fca | 54 | /* Free for 8 bit network */ |
2ea7a43c | 55 | if (depth == 0) { |
850cece6 | 56 | free_page((unsigned long)data); |
70288420 TJ |
57 | data = NULL; |
58 | return; | |
59 | } | |
2ea7a43c | 60 | |
06817fca | 61 | /* Free for 16 bit network */ |
2ea7a43c | 62 | if (depth == 1) { |
70288420 | 63 | struct ipt_account_mask_16 *mask_16 = (struct ipt_account_mask_16 *)data; |
4adc8355 | 64 | unsigned int b; |
2ea7a43c TJ |
65 | for (b=0; b <= 255; b++) { |
66 | if (mask_16->mask_24[b] != 0) { | |
850cece6 | 67 | free_page((unsigned long)mask_16->mask_24[b]); |
70288420 TJ |
68 | mask_16->mask_24[b] = NULL; |
69 | } | |
70 | } | |
850cece6 | 71 | free_page((unsigned long)data); |
70288420 TJ |
72 | data = NULL; |
73 | return; | |
2ea7a43c TJ |
74 | } |
75 | ||
06817fca | 76 | /* Free for 24 bit network */ |
2ea7a43c | 77 | if (depth == 3) { |
4adc8355 | 78 | unsigned int a, b; |
2ea7a43c TJ |
79 | for (a=0; a <= 255; a++) { |
80 | if (((struct ipt_account_mask_8 *)data)->mask_16[a]) { | |
70288420 | 81 | struct ipt_account_mask_16 *mask_16 = (struct ipt_account_mask_16*)((struct ipt_account_mask_8 *)data)->mask_16[a]; |
2ea7a43c | 82 | for (b=0; b <= 255; b++) { |
70288420 | 83 | if (mask_16->mask_24[b]) { |
850cece6 | 84 | free_page((unsigned long)mask_16->mask_24[b]); |
70288420 TJ |
85 | mask_16->mask_24[b] = NULL; |
86 | } | |
87 | } | |
850cece6 | 88 | free_page((unsigned long)mask_16); |
70288420 TJ |
89 | mask_16 = NULL; |
90 | } | |
91 | } | |
850cece6 | 92 | free_page((unsigned long)data); |
70288420 TJ |
93 | data = NULL; |
94 | return; | |
95 | } | |
2ea7a43c | 96 | |
850cece6 | 97 | printk("ACCOUNT: ipt_account_data_free called with unknown depth: %d\n", depth); |
70288420 TJ |
98 | return; |
99 | } | |
100 | ||
101 | /* Look for existing table / insert new one. Return internal ID or -1 on error */ | |
2ea7a43c | 102 | int ipt_account_table_insert(char *name, unsigned int ip, unsigned int netmask) { |
70288420 TJ |
103 | unsigned int i; |
104 | ||
850cece6 | 105 | DEBUGP("ACCOUNT: ipt_account_table_insert: %s, %u.%u.%u.%u/%u.%u.%u.%u\n", name, NIPQUAD(ip), NIPQUAD(netmask)); |
70288420 | 106 | |
06817fca | 107 | /* Look for existing table */ |
2ea7a43c TJ |
108 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) { |
109 | if (strncmp(ipt_account_tables[i].name, name, ACCOUNT_TABLE_NAME_LEN) == 0) { | |
850cece6 TJ |
110 | DEBUGP("ACCOUNT: Found existing slot: %d - %u.%u.%u.%u/%u.%u.%u.%u\n", i, |
111 | NIPQUAD(ipt_account_tables[i].ip), NIPQUAD(ipt_account_tables[i].netmask)); | |
2ea7a43c TJ |
112 | |
113 | if (ipt_account_tables[i].ip != ip || ipt_account_tables[i].netmask != netmask) { | |
850cece6 | 114 | printk("ACCOUNT: Table %s found, but IP/netmask mismatch. IP/netmask found: %u.%u.%u.%u/%u.%u.%u.%u\n", |
2ea7a43c | 115 | name, NIPQUAD(ipt_account_tables[i].ip), NIPQUAD(ipt_account_tables[i].netmask)); |
70288420 TJ |
116 | return -1; |
117 | } | |
118 | ||
119 | ipt_account_tables[i].refcount++; | |
120 | DEBUGP("ACCOUNT: Refcount: %d\n", ipt_account_tables[i].refcount); | |
121 | return i; | |
122 | } | |
123 | } | |
124 | ||
06817fca | 125 | /* Insert new table */ |
2ea7a43c | 126 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) { |
06817fca | 127 | /* Found free slot */ |
2ea7a43c | 128 | if (ipt_account_tables[i].name[0] == 0) { |
70288420 | 129 | DEBUGP("ACCOUNT: Found free slot: %d\n", i); |
2ea7a43c | 130 | |
70288420 | 131 | strncpy (ipt_account_tables[i].name, name, ACCOUNT_TABLE_NAME_LEN-1); |
2ea7a43c | 132 | |
70288420 TJ |
133 | ipt_account_tables[i].ip = ip; |
134 | ipt_account_tables[i].netmask = netmask; | |
2ea7a43c | 135 | |
06817fca | 136 | /* Calculate netsize */ |
850cece6 | 137 | unsigned int j, calc_mask, netsize=0; |
70288420 | 138 | calc_mask = htonl(netmask); |
2ea7a43c | 139 | for (j = 31; j > 0; j--) { |
70288420 | 140 | if (calc_mask&(1<<j)) |
850cece6 | 141 | netsize++; |
70288420 TJ |
142 | else |
143 | break; | |
144 | } | |
2ea7a43c | 145 | |
06817fca | 146 | /* Calculate depth from netsize */ |
850cece6 TJ |
147 | if (netsize >= 24) |
148 | ipt_account_tables[i].depth = 0; | |
149 | else if (netsize >= 16) | |
150 | ipt_account_tables[i].depth = 1; | |
151 | else if(netsize >= 8) | |
152 | ipt_account_tables[i].depth = 2; | |
2ea7a43c | 153 | |
850cece6 | 154 | printk("ACCOUNT: calculated netsize: %u -> ipt_account_table depth %u\n", netsize, ipt_account_tables[i].depth); |
2ea7a43c | 155 | |
70288420 | 156 | ipt_account_tables[i].refcount++; |
ad773892 | 157 | if ((ipt_account_tables[i].data = (void *)get_zeroed_page(GFP_ATOMIC)) == NULL) { |
850cece6 | 158 | printk("ACCOUNT: out of memory for data of table: %s\n", name); |
70288420 TJ |
159 | memset(&ipt_account_tables[i], 0, sizeof(struct ipt_account_table)); |
160 | return -1; | |
161 | } | |
2ea7a43c | 162 | |
70288420 TJ |
163 | return i; |
164 | } | |
165 | } | |
2ea7a43c | 166 | |
06817fca | 167 | /* No free slot found */ |
70288420 TJ |
168 | printk("ACCOUNT: No free table slot found (max: %d). Please increase ACCOUNT_MAX_TABLES.\n", ACCOUNT_MAX_TABLES); |
169 | return -1; | |
170 | } | |
171 | ||
172 | static int ipt_account_checkentry(const char *tablename, | |
2ea7a43c TJ |
173 | const struct ipt_entry *e, |
174 | void *targinfo, | |
175 | unsigned int targinfosize, | |
176 | unsigned int hook_mask) { | |
70288420 | 177 | struct ipt_account_info *info = targinfo; |
2ea7a43c | 178 | |
70288420 TJ |
179 | if (targinfosize != IPT_ALIGN(sizeof(struct ipt_account_info))) { |
180 | DEBUGP("ACCOUNT: targinfosize %u != %u\n", | |
2ea7a43c | 181 | targinfosize, IPT_ALIGN(sizeof(struct ipt_account_info))); |
70288420 TJ |
182 | return 0; |
183 | } | |
184 | ||
850cece6 | 185 | spin_lock_bh(&ipt_account_lock); |
70288420 | 186 | int table_nr = ipt_account_table_insert(info->table_name, info->net_ip, info->net_mask); |
2ea7a43c | 187 | if (table_nr == -1) { |
70288420 | 188 | printk("ACCOUNT: Table insert problem. Aborting\n"); |
850cece6 | 189 | spin_unlock_bh(&ipt_account_lock); |
70288420 TJ |
190 | return 0; |
191 | } | |
06817fca | 192 | /* Table nr caching so we don't have to do an extra string compare for every packet */ |
70288420 | 193 | info->table_nr = table_nr; |
2ea7a43c | 194 | |
850cece6 TJ |
195 | spin_unlock_bh(&ipt_account_lock); |
196 | ||
70288420 TJ |
197 | return 1; |
198 | } | |
199 | ||
2ea7a43c | 200 | void ipt_account_deleteentry(void *targinfo, unsigned int targinfosize) { |
850cece6 TJ |
201 | unsigned int i; |
202 | struct ipt_account_info *info = targinfo; | |
2ea7a43c | 203 | |
850cece6 TJ |
204 | if (targinfosize != IPT_ALIGN(sizeof(struct ipt_account_info))) { |
205 | DEBUGP("ACCOUNT: targinfosize %u != %u\n", | |
2ea7a43c | 206 | targinfosize, IPT_ALIGN(sizeof(struct ipt_account_info))); |
850cece6 TJ |
207 | } |
208 | ||
209 | spin_lock_bh(&ipt_account_lock); | |
2ea7a43c | 210 | |
850cece6 | 211 | DEBUGP("ACCOUNT: ipt_account_deleteentry called for table: %s (#%d)\n", info->table_name, info->table_nr); |
2ea7a43c | 212 | |
06817fca | 213 | info->table_nr = -1; /* Set back to original state */ |
2ea7a43c | 214 | |
06817fca | 215 | /* Look for table */ |
2ea7a43c TJ |
216 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) { |
217 | if (strncmp(ipt_account_tables[i].name, info->table_name, ACCOUNT_TABLE_NAME_LEN) == 0) { | |
850cece6 | 218 | DEBUGP("ACCOUNT: Found table at slot: %d\n", i); |
2ea7a43c | 219 | |
850cece6 TJ |
220 | ipt_account_tables[i].refcount--; |
221 | DEBUGP("ACCOUNT: Refcount left: %d\n", ipt_account_tables[i].refcount); | |
222 | ||
06817fca | 223 | /* Table not needed anymore? */ |
2ea7a43c | 224 | if (ipt_account_tables[i].refcount == 0) { |
850cece6 TJ |
225 | DEBUGP("ACCOUNT: Destroying table at slot: %d\n", i); |
226 | ipt_account_data_free(ipt_account_tables[i].data, ipt_account_tables[i].depth); | |
227 | memset(&ipt_account_tables[i], 0, sizeof(struct ipt_account_table)); | |
228 | } | |
2ea7a43c | 229 | |
850cece6 TJ |
230 | spin_unlock_bh(&ipt_account_lock); |
231 | return; | |
232 | } | |
233 | } | |
234 | ||
06817fca | 235 | /* Table not found */ |
850cece6 TJ |
236 | printk("ACCOUNT: Table %s not found for destroy\n", info->table_name); |
237 | spin_unlock_bh(&ipt_account_lock); | |
238 | } | |
239 | ||
4068e14d | 240 | void ipt_account_depth0_insert(struct ipt_account_mask_24 *mask_24, unsigned int net_ip, unsigned int netmask, |
2ea7a43c | 241 | unsigned int src_ip, unsigned int dst_ip, unsigned int size, unsigned int *itemcount) { |
4068e14d | 242 | unsigned char is_src = 0, is_dst = 0; |
2ea7a43c | 243 | |
4068e14d | 244 | 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", |
2ea7a43c TJ |
245 | NIPQUAD(src_ip), NIPQUAD(dst_ip), NIPQUAD(net_ip), NIPQUAD(netmask), size); |
246 | ||
06817fca TJ |
247 | /* Check if src/dst is inside our network. */ |
248 | /* Special: net_ip = 0.0.0.0/0 gets stored as src in slot 0 */ | |
4068e14d TJ |
249 | if (!netmask) |
250 | src_ip = 0; | |
251 | if ((net_ip&netmask) == (src_ip&netmask)) | |
252 | is_src = 1; | |
253 | if ((net_ip&netmask) == (dst_ip&netmask) && netmask) | |
254 | is_dst = 1; | |
2ea7a43c TJ |
255 | |
256 | if (!is_src && !is_dst) { | |
4068e14d | 257 | DEBUGP("ACCOUNT: Skipping packet %u.%u.%u.%u/%u.%u.%u.%u for net %u.%u.%u.%u/%u.%u.%u.%u\n", |
2ea7a43c | 258 | NIPQUAD(src_ip), NIPQUAD(dst_ip), NIPQUAD(net_ip), NIPQUAD(netmask)); |
4068e14d TJ |
259 | return; |
260 | } | |
2ea7a43c | 261 | |
06817fca | 262 | /* Check if this entry is new */ |
fa9124c2 | 263 | char is_src_new_ip = 0, is_dst_new_ip = 0; |
ff4ee64d | 264 | |
06817fca | 265 | /* Calculate array positions */ |
ff4ee64d TJ |
266 | unsigned char src_slot = (unsigned char)((src_ip&0xFF000000) >> 24); |
267 | unsigned char dst_slot = (unsigned char)((dst_ip&0xFF000000) >> 24); | |
2ea7a43c | 268 | |
06817fca | 269 | /* Increase size counters */ |
2ea7a43c | 270 | if (is_src) { |
06817fca | 271 | /* Calculate network slot */ |
5dbfa65d | 272 | DEBUGP("ACCOUNT: Calculated SRC 8 bit network slot: %d\n", src_slot); |
ff4ee64d | 273 | if (!mask_24->ip[src_slot].src_packets && !mask_24->ip[src_slot].dst_packets) |
fa9124c2 | 274 | is_src_new_ip = 1; |
2ea7a43c | 275 | |
ff4ee64d TJ |
276 | mask_24->ip[src_slot].src_packets++; |
277 | mask_24->ip[src_slot].src_bytes+=size; | |
4068e14d | 278 | } |
2ea7a43c | 279 | if (is_dst) { |
5dbfa65d | 280 | DEBUGP("ACCOUNT: Calculated DST 8 bit network slot: %d\n", dst_slot); |
ff4ee64d | 281 | if (!mask_24->ip[dst_slot].src_packets && !mask_24->ip[dst_slot].dst_packets) |
fa9124c2 | 282 | is_dst_new_ip = 1; |
2ea7a43c | 283 | |
ff4ee64d TJ |
284 | mask_24->ip[dst_slot].dst_packets++; |
285 | mask_24->ip[dst_slot].dst_bytes+=size; | |
4068e14d | 286 | } |
2ea7a43c | 287 | |
06817fca | 288 | /* Increase itemcounter */ |
4adc8355 | 289 | DEBUGP("ACCOUNT: Itemcounter before: %d\n", *itemcount); |
2ea7a43c | 290 | if (src_slot == dst_slot) { |
4adc8355 TJ |
291 | if (is_src_new_ip || is_dst_new_ip) { |
292 | DEBUGP("ACCOUNT: src_slot == dst_slot: %d, %d\n", is_src_new_ip, is_dst_new_ip); | |
fa9124c2 | 293 | (*itemcount)++; |
4adc8355 | 294 | } |
fa9124c2 | 295 | } else { |
4adc8355 TJ |
296 | if (is_src_new_ip) { |
297 | DEBUGP("ACCOUNT: New src_ip: %u.%u.%u.%u\n", NIPQUAD(src_ip)); | |
fa9124c2 | 298 | (*itemcount)++; |
4adc8355 TJ |
299 | } |
300 | if (is_dst_new_ip) { | |
301 | DEBUGP("ACCOUNT: New dst_ip: %u.%u.%u.%u\n", NIPQUAD(dst_ip)); | |
fa9124c2 | 302 | (*itemcount)++; |
4adc8355 | 303 | } |
fa9124c2 | 304 | } |
4adc8355 | 305 | DEBUGP("ACCOUNT: Itemcounter after: %d\n", *itemcount); |
4068e14d TJ |
306 | } |
307 | ||
308 | void ipt_account_depth1_insert(struct ipt_account_mask_16 *mask_16, unsigned int net_ip, unsigned int netmask, | |
2ea7a43c | 309 | unsigned int src_ip, unsigned int dst_ip, unsigned int size, unsigned int *itemcount) { |
06817fca | 310 | /* Do we need to process src IP? */ |
2ea7a43c | 311 | if ((net_ip&netmask) == (src_ip&netmask)) { |
4068e14d TJ |
312 | unsigned char slot = (unsigned char)((src_ip&0x00FF0000) >> 16); |
313 | DEBUGP("ACCOUNT: Calculated SRC 16 bit network slot: %d\n", slot); | |
2ea7a43c | 314 | |
06817fca | 315 | /* Do we need to create a new mask_24 bucket? */ |
ad773892 | 316 | if (!mask_16->mask_24[slot] && (mask_16->mask_24[slot] = (void *)get_zeroed_page(GFP_ATOMIC)) == NULL) { |
4068e14d TJ |
317 | printk("ACCOUNT: Can't process packet because out of memory!\n"); |
318 | return; | |
319 | } | |
2ea7a43c | 320 | |
4068e14d | 321 | ipt_account_depth0_insert((struct ipt_account_mask_24 *)mask_16->mask_24[slot], net_ip, netmask, |
2ea7a43c | 322 | src_ip, 0, size, itemcount); |
4068e14d | 323 | } |
2ea7a43c | 324 | |
06817fca | 325 | /* Do we need to process dst IP? */ |
2ea7a43c | 326 | if ((net_ip&netmask) == (dst_ip&netmask)) { |
4068e14d TJ |
327 | unsigned char slot = (unsigned char)((dst_ip&0x00FF0000) >> 16); |
328 | DEBUGP("ACCOUNT: Calculated DST 16 bit network slot: %d\n", slot); | |
2ea7a43c | 329 | |
06817fca | 330 | /* Do we need to create a new mask_24 bucket? */ |
ad773892 | 331 | if (!mask_16->mask_24[slot] && (mask_16->mask_24[slot] = (void *)get_zeroed_page(GFP_ATOMIC)) == NULL) { |
4068e14d TJ |
332 | printk("ACCOUT: Can't process packet because out of memory!\n"); |
333 | return; | |
334 | } | |
2ea7a43c | 335 | |
4068e14d | 336 | ipt_account_depth0_insert((struct ipt_account_mask_24 *)mask_16->mask_24[slot], net_ip, netmask, |
2ea7a43c | 337 | 0, dst_ip, size, itemcount); |
4068e14d TJ |
338 | } |
339 | } | |
340 | ||
341 | void ipt_account_depth2_insert(struct ipt_account_mask_8 *mask_8, unsigned int net_ip, unsigned int netmask, | |
2ea7a43c | 342 | unsigned int src_ip, unsigned int dst_ip, unsigned int size, unsigned int *itemcount) { |
06817fca | 343 | /* Do we need to process src IP? */ |
2ea7a43c | 344 | if ((net_ip&netmask) == (src_ip&netmask)) { |
4068e14d TJ |
345 | unsigned char slot = (unsigned char)((src_ip&0x0000FF00) >> 8); |
346 | DEBUGP("ACCOUNT: Calculated SRC 24 bit network slot: %d\n", slot); | |
2ea7a43c | 347 | |
06817fca | 348 | /* Do we need to create a new mask_24 bucket? */ |
ad773892 | 349 | if (!mask_8->mask_16[slot] && (mask_8->mask_16[slot] = (void *)get_zeroed_page(GFP_ATOMIC)) == NULL) { |
4068e14d TJ |
350 | printk("ACCOUNT: Can't process packet because out of memory!\n"); |
351 | return; | |
352 | } | |
2ea7a43c | 353 | |
4068e14d | 354 | ipt_account_depth1_insert((struct ipt_account_mask_16 *)mask_8->mask_16[slot], net_ip, netmask, |
2ea7a43c | 355 | src_ip, 0, size, itemcount); |
4068e14d | 356 | } |
2ea7a43c | 357 | |
06817fca | 358 | /* Do we need to process dst IP? */ |
2ea7a43c | 359 | if ((net_ip&netmask) == (dst_ip&netmask)) { |
4068e14d TJ |
360 | unsigned char slot = (unsigned char)((dst_ip&0x0000FF00) >> 8); |
361 | DEBUGP("ACCOUNT: Calculated DST 24 bit network slot: %d\n", slot); | |
2ea7a43c | 362 | |
06817fca | 363 | /* Do we need to create a new mask_24 bucket? */ |
ad773892 | 364 | if (!mask_8->mask_16[slot] && (mask_8->mask_16[slot] = (void *)get_zeroed_page(GFP_ATOMIC)) == NULL) { |
4068e14d TJ |
365 | printk("ACCOUNT: Can't process packet because out of memory!\n"); |
366 | return; | |
367 | } | |
2ea7a43c | 368 | |
4068e14d | 369 | ipt_account_depth1_insert((struct ipt_account_mask_16 *)mask_8->mask_16[slot], net_ip, netmask, |
2ea7a43c | 370 | 0, dst_ip, size, itemcount); |
4068e14d TJ |
371 | } |
372 | } | |
373 | ||
374 | static unsigned int ipt_account_target(struct sk_buff **pskb, | |
2ea7a43c TJ |
375 | unsigned int hooknum, |
376 | const struct net_device *in, | |
377 | const struct net_device *out, | |
378 | const void *targinfo, | |
379 | void *userinfo) { | |
4068e14d TJ |
380 | const struct ipt_account_info *info = (const struct ipt_account_info *)targinfo; |
381 | unsigned int src_ip = (*pskb)->nh.iph->saddr; | |
382 | unsigned int dst_ip = (*pskb)->nh.iph->daddr; | |
383 | unsigned int size = ntohs((*pskb)->nh.iph->tot_len); | |
2ea7a43c | 384 | |
4068e14d | 385 | spin_lock_bh(&ipt_account_lock); |
2ea7a43c TJ |
386 | |
387 | if (ipt_account_tables[info->table_nr].name[0] == 0) { | |
4068e14d TJ |
388 | printk("ACCOUNT: ipt_account_target: Invalid table id %u. IPs %u.%u.%u.%u/%u.%u.%u.%u\n", |
389 | info->table_nr, NIPQUAD(src_ip), NIPQUAD(dst_ip)); | |
390 | spin_unlock_bh(&ipt_account_lock); | |
391 | return IPT_CONTINUE; | |
392 | } | |
2ea7a43c | 393 | |
06817fca | 394 | /* 8 bit network or "any" network */ |
2ea7a43c | 395 | if (ipt_account_tables[info->table_nr].depth == 0) { |
06817fca | 396 | /* Count packet and check if the IP is new */ |
4068e14d TJ |
397 | ipt_account_depth0_insert((struct ipt_account_mask_24 *)ipt_account_tables[info->table_nr].data, |
398 | ipt_account_tables[info->table_nr].ip, ipt_account_tables[info->table_nr].netmask, | |
399 | src_ip, dst_ip, size, &ipt_account_tables[info->table_nr].itemcount); | |
400 | spin_unlock_bh(&ipt_account_lock); | |
401 | return IPT_CONTINUE; | |
2ea7a43c TJ |
402 | } |
403 | ||
06817fca | 404 | /* 16 bit network */ |
2ea7a43c | 405 | if (ipt_account_tables[info->table_nr].depth == 1) { |
4068e14d TJ |
406 | ipt_account_depth1_insert((struct ipt_account_mask_16 *)ipt_account_tables[info->table_nr].data, |
407 | ipt_account_tables[info->table_nr].ip, ipt_account_tables[info->table_nr].netmask, | |
408 | src_ip, dst_ip, size, &ipt_account_tables[info->table_nr].itemcount); | |
409 | spin_unlock_bh(&ipt_account_lock); | |
410 | return IPT_CONTINUE; | |
411 | } | |
2ea7a43c | 412 | |
06817fca | 413 | /* 24 bit network */ |
2ea7a43c | 414 | if (ipt_account_tables[info->table_nr].depth == 2) { |
4068e14d TJ |
415 | ipt_account_depth2_insert((struct ipt_account_mask_8 *)ipt_account_tables[info->table_nr].data, |
416 | ipt_account_tables[info->table_nr].ip, ipt_account_tables[info->table_nr].netmask, | |
417 | src_ip, dst_ip, size, &ipt_account_tables[info->table_nr].itemcount); | |
418 | spin_unlock_bh(&ipt_account_lock); | |
419 | return IPT_CONTINUE; | |
420 | } | |
2ea7a43c | 421 | |
4068e14d | 422 | printk("ACCOUNT: ipt_account_target: Unable to process packet. Table id %u. IPs %u.%u.%u.%u/%u.%u.%u.%u\n", |
2ea7a43c TJ |
423 | info->table_nr, NIPQUAD(src_ip), NIPQUAD(dst_ip)); |
424 | ||
4068e14d TJ |
425 | spin_unlock_bh(&ipt_account_lock); |
426 | return IPT_CONTINUE; | |
427 | } | |
428 | ||
bea3921b TJ |
429 | /* |
430 | Functions dealing with "handles": | |
431 | Handles are snapshots of a accounting state. | |
432 | ||
433 | read snapshots are only for debugging the code | |
434 | and are very expensive concerning speed/memory | |
435 | compared to read_and_flush. | |
436 | ||
437 | The functions aren't protected by spinlocks themselves | |
438 | as this is done in the ioctl part of the code. | |
439 | */ | |
440 | ||
441 | /* | |
442 | Find a free handle slot. Normally only one should be used, | |
443 | but there could be two or more applications accessing the data | |
444 | at the same time. | |
445 | */ | |
2ea7a43c | 446 | int ipt_account_handle_find_slot(void) { |
bea3921b | 447 | unsigned int i; |
06817fca | 448 | /* Insert new table */ |
2ea7a43c | 449 | for (i = 0; i < ACCOUNT_MAX_HANDLES; i++) { |
06817fca | 450 | /* Found free slot */ |
2ea7a43c | 451 | if (ipt_account_handles[i].data == NULL) { |
06817fca TJ |
452 | /* Don't "mark" data as used as we are protected by a spinlock by the calling function. */ |
453 | /* handle_find_slot() is only a function to prevent code duplication. */ | |
bea3921b TJ |
454 | return i; |
455 | } | |
456 | } | |
2ea7a43c | 457 | |
06817fca | 458 | /* No free slot found */ |
bea3921b TJ |
459 | printk("ACCOUNT: No free handle slot found (max: %u). Please increase ACCOUNT_MAX_HANDLES.\n", ACCOUNT_MAX_HANDLES); |
460 | return -1; | |
461 | } | |
462 | ||
2ea7a43c TJ |
463 | int ipt_account_handle_free(unsigned int handle) { |
464 | if (handle >= ACCOUNT_MAX_HANDLES) { | |
bea3921b TJ |
465 | printk("ACCOUNT: Invalid handle for ipt_account_handle_free() specified: %u\n", handle); |
466 | return -EINVAL; | |
467 | } | |
2ea7a43c | 468 | |
bea3921b TJ |
469 | ipt_account_data_free(ipt_account_handles[handle].data, ipt_account_handles[handle].depth); |
470 | memset (&ipt_account_handles[handle], 0, sizeof (struct ipt_account_handle)); | |
471 | return 0; | |
472 | } | |
473 | ||
474 | /* Prepare data for read without flush. Use only for debugging! | |
475 | Real applications should use read&flush as it's way more efficent */ | |
2ea7a43c | 476 | int ipt_account_handle_prepare_read(char *tablename, unsigned int *count) { |
bea3921b | 477 | int handle, i, table_nr=-1; |
2ea7a43c | 478 | |
bea3921b | 479 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) |
2ea7a43c | 480 | if (strncmp(ipt_account_tables[i].name, tablename, ACCOUNT_TABLE_NAME_LEN) == 0) { |
bea3921b TJ |
481 | table_nr = i; |
482 | break; | |
483 | } | |
484 | ||
2ea7a43c | 485 | if (table_nr == -1) { |
bea3921b TJ |
486 | printk("ACCOUNT: ipt_account_handle_prepare_read(): Table %s not found\n", tablename); |
487 | return -1; | |
488 | } | |
2ea7a43c | 489 | |
06817fca | 490 | /* Can't find a free handle slot? */ |
bea3921b TJ |
491 | if ((handle = ipt_account_handle_find_slot()) == -1) |
492 | return -1; | |
2ea7a43c | 493 | |
06817fca | 494 | /* Fill up handle structure */ |
bea3921b TJ |
495 | ipt_account_handles[handle].ip = ipt_account_tables[table_nr].ip; |
496 | ipt_account_handles[handle].depth = ipt_account_tables[table_nr].depth; | |
497 | ipt_account_handles[handle].itemcount = ipt_account_tables[table_nr].itemcount; | |
2ea7a43c | 498 | |
06817fca | 499 | /* allocate "root" table */ |
ad773892 | 500 | if ((ipt_account_handles[handle].data = (void*)get_zeroed_page(GFP_ATOMIC)) == NULL) { |
bea3921b TJ |
501 | printk("ACCOUNT: out of memory for root table in ipt_account_handle_prepare_read()\n"); |
502 | memset (&ipt_account_handles[handle], 0, sizeof(struct ipt_account_handle)); | |
2ea7a43c | 503 | return -1; |
bea3921b | 504 | } |
2ea7a43c | 505 | |
06817fca | 506 | /* Recursive copy of complete data structure */ |
bea3921b | 507 | unsigned int depth = ipt_account_handles[handle].depth; |
2ea7a43c | 508 | if (depth == 0) { |
bea3921b TJ |
509 | memcpy(ipt_account_handles[handle].data, ipt_account_tables[table_nr].data, sizeof(struct ipt_account_mask_24)); |
510 | } else if (depth == 1) { | |
511 | struct ipt_account_mask_16 *src_16 = (struct ipt_account_mask_16 *)ipt_account_tables[table_nr].data; | |
512 | struct ipt_account_mask_16 *network_16 = (struct ipt_account_mask_16 *)ipt_account_handles[handle].data; | |
4adc8355 | 513 | unsigned int b; |
2ea7a43c TJ |
514 | |
515 | for (b = 0; b <= 255; b++) { | |
516 | if (src_16->mask_24[b]) { | |
ad773892 | 517 | if ((network_16->mask_24[b] = (void*)get_zeroed_page(GFP_ATOMIC)) == NULL) { |
bea3921b TJ |
518 | printk("ACCOUNT: out of memory during copy of 16 bit network in ipt_account_handle_prepare_read()\n"); |
519 | ipt_account_data_free(ipt_account_handles[handle].data, depth); | |
520 | memset (&ipt_account_handles[handle], 0, sizeof(struct ipt_account_handle)); | |
2ea7a43c | 521 | return -1; |
bea3921b | 522 | } |
2ea7a43c | 523 | |
bea3921b TJ |
524 | memcpy(network_16->mask_24[b], src_16->mask_24[b], sizeof(struct ipt_account_mask_24)); |
525 | } | |
526 | } | |
527 | } else if(depth == 2) { | |
528 | struct ipt_account_mask_8 *src_8 = (struct ipt_account_mask_8 *)ipt_account_tables[table_nr].data; | |
529 | struct ipt_account_mask_8 *network_8 = (struct ipt_account_mask_8 *)ipt_account_handles[handle].data; | |
4adc8355 | 530 | unsigned int a; |
2ea7a43c TJ |
531 | |
532 | for (a = 0; a <= 255; a++) { | |
533 | if (src_8->mask_16[a]) { | |
ad773892 | 534 | if ((network_8->mask_16[a] = (void*)get_zeroed_page(GFP_ATOMIC)) == NULL) { |
bea3921b TJ |
535 | printk("ACCOUNT: out of memory during copy of 24 bit network in ipt_account_handle_prepare_read()\n"); |
536 | ipt_account_data_free(ipt_account_handles[handle].data, depth); | |
537 | memset (&ipt_account_handles[handle], 0, sizeof(struct ipt_account_handle)); | |
2ea7a43c | 538 | return -1; |
bea3921b TJ |
539 | } |
540 | ||
541 | memcpy(network_8->mask_16[a], src_8->mask_16[a], sizeof(struct ipt_account_mask_16)); | |
2ea7a43c | 542 | |
bea3921b TJ |
543 | struct ipt_account_mask_16 *src_16 = src_8->mask_16[a]; |
544 | struct ipt_account_mask_16 *network_16 = network_8->mask_16[a]; | |
4adc8355 | 545 | unsigned int b; |
2ea7a43c TJ |
546 | |
547 | for (b = 0; b <= 255; b++) { | |
548 | if (src_16->mask_24[b]) { | |
ad773892 | 549 | if ((network_16->mask_24[b] = (void*)get_zeroed_page(GFP_ATOMIC)) == NULL) { |
bea3921b TJ |
550 | printk("ACCOUNT: out of memory during copy of 16 bit network in ipt_account_handle_prepare_read()\n"); |
551 | ipt_account_data_free(ipt_account_handles[handle].data, depth); | |
552 | memset (&ipt_account_handles[handle], 0, sizeof(struct ipt_account_handle)); | |
2ea7a43c | 553 | return -1; |
bea3921b | 554 | } |
2ea7a43c | 555 | |
bea3921b TJ |
556 | memcpy(network_16->mask_24[b], src_16->mask_24[b], sizeof(struct ipt_account_mask_24)); |
557 | } | |
558 | } | |
559 | } | |
560 | } | |
561 | } | |
562 | ||
563 | *count = ipt_account_tables[table_nr].itemcount; | |
564 | return handle; | |
565 | } | |
566 | ||
567 | /* Prepare data for read and flush it */ | |
2ea7a43c | 568 | int ipt_account_handle_prepare_read_flush(char *tablename, unsigned int *count) { |
bea3921b | 569 | int handle, i, table_nr=-1; |
2ea7a43c | 570 | |
bea3921b | 571 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) |
2ea7a43c | 572 | if (strncmp(ipt_account_tables[i].name, tablename, ACCOUNT_TABLE_NAME_LEN) == 0) { |
bea3921b TJ |
573 | table_nr = i; |
574 | break; | |
575 | } | |
576 | ||
2ea7a43c | 577 | if (table_nr == -1) { |
bea3921b TJ |
578 | printk("ACCOUNT: ipt_account_handle_prepare_read_flush(): Table %s not found\n", tablename); |
579 | return -1; | |
580 | } | |
2ea7a43c | 581 | |
06817fca | 582 | /* Can't find a free handle slot? */ |
bea3921b TJ |
583 | if ((handle = ipt_account_handle_find_slot()) == -1) |
584 | return -1; | |
2ea7a43c | 585 | |
ad773892 TJ |
586 | /* Try to allocate memory */ |
587 | void *new_data_page = get_zeroed_page(GFP_ATOMIC); | |
588 | if (!new_data_page) | |
589 | { | |
590 | printk("ACCOUNT: ipt_account_handle_prepare_read_flush(): Out of memory!\n"); | |
591 | return -1; | |
592 | } | |
593 | ||
06817fca | 594 | /* Fill up handle structure */ |
bea3921b TJ |
595 | ipt_account_handles[handle].ip = ipt_account_tables[table_nr].ip; |
596 | ipt_account_handles[handle].depth = ipt_account_tables[table_nr].depth; | |
597 | ipt_account_handles[handle].itemcount = ipt_account_tables[table_nr].itemcount; | |
598 | ipt_account_handles[handle].data = ipt_account_tables[table_nr].data; | |
599 | *count = ipt_account_tables[table_nr].itemcount; | |
600 | ||
06817fca | 601 | /* "Flush" table data */ |
ad773892 | 602 | ipt_account_tables[table_nr].data = new_data_page; |
bea3921b TJ |
603 | ipt_account_tables[table_nr].itemcount = 0; |
604 | ||
605 | return handle; | |
606 | } | |
607 | ||
608 | /* Copy the actual that into a prepared buffer. | |
609 | We only copy entries != 0 to increase performance. | |
610 | The memory gets freed again in ipt_account_handle_free(). | |
611 | */ | |
2ea7a43c TJ |
612 | int ipt_account_handle_get_data(unsigned int handle, void *buffer) { |
613 | struct ipt_account_handle_ip handle_ip; | |
bea3921b | 614 | unsigned int handle_ip_size = sizeof (struct ipt_account_handle_ip); |
9c44d30e | 615 | unsigned int i, tmpbuf_pos=0; |
bea3921b | 616 | |
2ea7a43c | 617 | if (handle >= ACCOUNT_MAX_HANDLES) { |
bea3921b TJ |
618 | printk("ACCOUNT: invalid handle for ipt_account_handle_get_data() specified: %u\n", handle); |
619 | return -1; | |
620 | } | |
2ea7a43c TJ |
621 | |
622 | if (ipt_account_handles[handle].data == NULL) { | |
bea3921b TJ |
623 | printk("ACCOUNT: handle %u is BROKEN: Contains no data\n", handle); |
624 | return -1; | |
625 | } | |
2ea7a43c | 626 | |
bea3921b TJ |
627 | unsigned int net_ip = ipt_account_handles[handle].ip; |
628 | unsigned int depth = ipt_account_handles[handle].depth; | |
2ea7a43c | 629 | |
06817fca | 630 | /* 8 bit network */ |
2ea7a43c | 631 | if (depth == 0) { |
bea3921b | 632 | struct ipt_account_mask_24 *network = (struct ipt_account_mask_24*)ipt_account_handles[handle].data; |
2ea7a43c TJ |
633 | for (i = 0; i <= 255; i++) { |
634 | if (network->ip[i].src_packets || network->ip[i].dst_packets) { | |
bea3921b TJ |
635 | handle_ip.ip = net_ip | (i<<24); |
636 | handle_ip.src_packets = network->ip[i].src_packets; | |
637 | handle_ip.src_bytes = network->ip[i].src_bytes; | |
638 | handle_ip.dst_packets = network->ip[i].dst_packets; | |
639 | handle_ip.dst_bytes = network->ip[i].dst_bytes; | |
640 | ||
06817fca | 641 | /* Temporary buffer full? Flush to userspace */ |
2ea7a43c | 642 | if (tmpbuf_pos+handle_ip_size >= PAGE_SIZE) { |
9c44d30e TJ |
643 | copy_to_user(buffer, ipt_account_tmpbuf, tmpbuf_pos); |
644 | tmpbuf_pos = 0; | |
645 | } | |
646 | memcpy(ipt_account_tmpbuf+tmpbuf_pos, &handle_ip, handle_ip_size); | |
647 | tmpbuf_pos += handle_ip_size; | |
bea3921b TJ |
648 | } |
649 | } | |
9c44d30e | 650 | |
06817fca | 651 | /* Flush remaining data to userspace */ |
9c44d30e TJ |
652 | if (tmpbuf_pos) |
653 | copy_to_user(buffer, ipt_account_tmpbuf, tmpbuf_pos); | |
2ea7a43c | 654 | |
bea3921b TJ |
655 | return 0; |
656 | } | |
2ea7a43c | 657 | |
06817fca | 658 | /* 16 bit network */ |
2ea7a43c | 659 | if (depth == 1) { |
bea3921b | 660 | struct ipt_account_mask_16 *network_16 = (struct ipt_account_mask_16*)ipt_account_handles[handle].data; |
4adc8355 | 661 | unsigned int b; |
2ea7a43c TJ |
662 | for (b = 0; b <= 255; b++) { |
663 | if (network_16->mask_24[b]) { | |
bea3921b | 664 | struct ipt_account_mask_24 *network = (struct ipt_account_mask_24*)network_16->mask_24[b]; |
2ea7a43c TJ |
665 | for (i = 0; i <= 255; i++) { |
666 | if (network->ip[i].src_packets || network->ip[i].dst_packets) { | |
bea3921b TJ |
667 | handle_ip.ip = net_ip | (b << 16) | (i<<24); |
668 | handle_ip.src_packets = network->ip[i].src_packets; | |
669 | handle_ip.src_bytes = network->ip[i].src_bytes; | |
670 | handle_ip.dst_packets = network->ip[i].dst_packets; | |
671 | handle_ip.dst_bytes = network->ip[i].dst_bytes; | |
2ea7a43c | 672 | |
06817fca | 673 | /* Temporary buffer full? Flush to userspace */ |
2ea7a43c | 674 | if (tmpbuf_pos+handle_ip_size >= PAGE_SIZE) { |
9c44d30e TJ |
675 | copy_to_user(buffer, ipt_account_tmpbuf, tmpbuf_pos); |
676 | tmpbuf_pos = 0; | |
677 | } | |
678 | memcpy(ipt_account_tmpbuf+tmpbuf_pos, &handle_ip, handle_ip_size); | |
679 | tmpbuf_pos += handle_ip_size; | |
bea3921b TJ |
680 | } |
681 | } | |
682 | } | |
683 | } | |
2ea7a43c | 684 | |
06817fca | 685 | /* Flush remaining data to userspace */ |
9c44d30e TJ |
686 | if (tmpbuf_pos) |
687 | copy_to_user(buffer, ipt_account_tmpbuf, tmpbuf_pos); | |
2ea7a43c | 688 | |
bea3921b TJ |
689 | return 0; |
690 | } | |
2ea7a43c | 691 | |
06817fca | 692 | /* 24 bit network */ |
2ea7a43c | 693 | if (depth == 2) { |
bea3921b | 694 | struct ipt_account_mask_8 *network_8 = (struct ipt_account_mask_8*)ipt_account_handles[handle].data; |
4adc8355 | 695 | unsigned int a, b; |
2ea7a43c TJ |
696 | for (a = 0; a <= 255; a++) { |
697 | if (network_8->mask_16[a]) { | |
bea3921b | 698 | struct ipt_account_mask_16 *network_16 = (struct ipt_account_mask_16*)network_8->mask_16[a]; |
2ea7a43c TJ |
699 | for (b = 0; b <= 255; b++) { |
700 | if (network_16->mask_24[b]) { | |
bea3921b | 701 | struct ipt_account_mask_24 *network = (struct ipt_account_mask_24*)network_16->mask_24[b]; |
2ea7a43c TJ |
702 | for (i = 0; i <= 255; i++) { |
703 | if (network->ip[i].src_packets || network->ip[i].dst_packets) { | |
bea3921b TJ |
704 | handle_ip.ip = net_ip | (a << 8) | (b << 16) | (i<<24); |
705 | handle_ip.src_packets = network->ip[i].src_packets; | |
706 | handle_ip.src_bytes = network->ip[i].src_bytes; | |
707 | handle_ip.dst_packets = network->ip[i].dst_packets; | |
708 | handle_ip.dst_bytes = network->ip[i].dst_bytes; | |
2ea7a43c | 709 | |
06817fca | 710 | /* Temporary buffer full? Flush to userspace */ |
2ea7a43c | 711 | if (tmpbuf_pos+handle_ip_size >= PAGE_SIZE) { |
9c44d30e TJ |
712 | copy_to_user(buffer, ipt_account_tmpbuf, tmpbuf_pos); |
713 | tmpbuf_pos = 0; | |
714 | } | |
715 | memcpy(ipt_account_tmpbuf+tmpbuf_pos, &handle_ip, handle_ip_size); | |
716 | tmpbuf_pos += handle_ip_size; | |
bea3921b TJ |
717 | } |
718 | } | |
719 | } | |
720 | } | |
721 | } | |
722 | } | |
2ea7a43c | 723 | |
06817fca | 724 | /* Flush remaining data to userspace */ |
9c44d30e TJ |
725 | if (tmpbuf_pos) |
726 | copy_to_user(buffer, ipt_account_tmpbuf, tmpbuf_pos); | |
2ea7a43c | 727 | |
bea3921b TJ |
728 | return 0; |
729 | } | |
2ea7a43c | 730 | |
bea3921b TJ |
731 | return -1; |
732 | } | |
733 | ||
2ea7a43c | 734 | static int ipt_account_set_ctl(struct sock *sk, int cmd, void *user, unsigned int len) { |
bea3921b TJ |
735 | struct ipt_account_handle_sockopt handle; |
736 | int ret = -EINVAL; | |
737 | ||
738 | if (!capable(CAP_NET_ADMIN)) | |
2ea7a43c TJ |
739 | return -EPERM; |
740 | ||
741 | switch (cmd) { | |
742 | case IPT_SO_SET_ACCOUNT_HANDLE_FREE: | |
743 | if (len != sizeof(struct ipt_account_handle_sockopt)) { | |
744 | 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)); | |
745 | break; | |
746 | } | |
747 | ||
748 | if (copy_from_user (&handle, user, len)) { | |
749 | printk("ACCOUNT: ipt_account_set_ctl: copy_from_user failed for IPT_SO_SET_HANDLE_FREE\n"); | |
bea3921b | 750 | break; |
2ea7a43c TJ |
751 | } |
752 | ||
753 | spin_lock_bh(&ipt_account_userspace_lock); | |
754 | ret = ipt_account_handle_free(handle.handle_nr); | |
755 | spin_unlock_bh(&ipt_account_userspace_lock); | |
756 | break; | |
757 | case IPT_SO_SET_ACCOUNT_HANDLE_FREE_ALL: { | |
5b15c288 TJ |
758 | unsigned int i; |
759 | spin_lock_bh(&ipt_account_userspace_lock); | |
760 | for (i = 0; i < ACCOUNT_MAX_HANDLES; i++) | |
761 | ipt_account_handle_free(i); | |
762 | spin_unlock_bh(&ipt_account_userspace_lock); | |
763 | ret = 0; | |
764 | break; | |
765 | } | |
2ea7a43c TJ |
766 | default: |
767 | printk("ACCOUNT: ipt_account_set_ctl: unknown request %i\n", cmd); | |
bea3921b TJ |
768 | } |
769 | ||
770 | return ret; | |
771 | } | |
772 | ||
2ea7a43c | 773 | static int ipt_account_get_ctl(struct sock *sk, int cmd, void *user, int *len) { |
bea3921b TJ |
774 | struct ipt_account_handle_sockopt handle; |
775 | int ret = -EINVAL; | |
776 | ||
777 | if (!capable(CAP_NET_ADMIN)) | |
2ea7a43c TJ |
778 | return -EPERM; |
779 | ||
780 | switch (cmd) { | |
781 | case IPT_SO_GET_ACCOUNT_PREPARE_READ_FLUSH: | |
782 | case IPT_SO_GET_ACCOUNT_PREPARE_READ: | |
783 | if (*len < sizeof(struct ipt_account_handle_sockopt)) { | |
784 | printk("ACCOUNT: ipt_account_get_ctl: wrong data size (%u != %u) for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n", | |
785 | *len, sizeof(struct ipt_account_handle_sockopt)); | |
bea3921b | 786 | break; |
2ea7a43c TJ |
787 | } |
788 | ||
789 | if (copy_from_user (&handle, user, sizeof(struct ipt_account_handle_sockopt))) { | |
790 | printk("ACCOUNT: ipt_account_get_ctl: copy_from_user failed for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n"); | |
791 | break; | |
792 | } | |
793 | ||
794 | spin_lock_bh(&ipt_account_lock); | |
795 | spin_lock_bh(&ipt_account_userspace_lock); | |
796 | if (cmd == IPT_SO_GET_ACCOUNT_PREPARE_READ_FLUSH) | |
797 | handle.handle_nr = ipt_account_handle_prepare_read_flush(handle.name, &handle.itemcount); | |
798 | else | |
799 | handle.handle_nr = ipt_account_handle_prepare_read(handle.name, &handle.itemcount); | |
800 | spin_unlock_bh(&ipt_account_userspace_lock); | |
801 | spin_unlock_bh(&ipt_account_lock); | |
802 | ||
803 | if (handle.handle_nr == -1) { | |
804 | printk("ACCOUNT: ipt_account_get_ctl: ipt_account_handle_prepare_read failed\n"); | |
805 | break; | |
806 | } | |
807 | ||
808 | if (copy_to_user(user, &handle, sizeof(struct ipt_account_handle_sockopt))) { | |
809 | printk("ACCOUNT: ipt_account_set_ctl: copy_to_user failed for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n"); | |
810 | break; | |
811 | } | |
812 | ret = 0; | |
813 | break; | |
814 | case IPT_SO_GET_ACCOUNT_GET_DATA: | |
815 | if (*len < sizeof(struct ipt_account_handle_sockopt)) { | |
816 | printk("ACCOUNT: ipt_account_get_ctl: wrong data size (%u != %u) for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n", | |
817 | *len, sizeof(struct ipt_account_handle_sockopt)); | |
818 | break; | |
819 | } | |
820 | ||
821 | if (copy_from_user (&handle, user, sizeof(struct ipt_account_handle_sockopt))) { | |
822 | printk("ACCOUNT: ipt_account_get_ctl: copy_from_user failed for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n"); | |
823 | break; | |
824 | } | |
825 | ||
826 | if (handle.handle_nr >= ACCOUNT_MAX_HANDLES) { | |
827 | printk("ACCOUNT: Invalid handle for IPT_SO_GET_ACCOUNT_GET_DATA: %u\n", handle.handle_nr); | |
828 | break; | |
829 | } | |
830 | ||
831 | if (*len < ipt_account_handles[handle.handle_nr].itemcount*sizeof(struct ipt_account_handle_ip)) { | |
832 | printk("ACCOUNT: ipt_account_get_ctl: not enough space (%u < %u) to store data from IPT_SO_GET_ACCOUNT_GET_DATA\n", | |
833 | *len, ipt_account_handles[handle.handle_nr].itemcount*sizeof(struct ipt_account_handle_ip)); | |
834 | ret = -ENOMEM; | |
bea3921b | 835 | break; |
2ea7a43c TJ |
836 | } |
837 | ||
838 | spin_lock_bh(&ipt_account_userspace_lock); | |
839 | ret = ipt_account_handle_get_data(handle.handle_nr, user); | |
840 | spin_unlock_bh(&ipt_account_userspace_lock); | |
841 | if (ret) { | |
842 | printk("ACCOUNT: ipt_account_get_ctl: ipt_account_handle_get_data failed for handle %u\n", handle.handle_nr); | |
843 | break; | |
844 | } | |
845 | ||
846 | ret = 0; | |
847 | break; | |
848 | case IPT_SO_GET_ACCOUNT_GET_HANDLE_USAGE: { | |
849 | if (*len < sizeof(struct ipt_account_handle_sockopt)) { | |
5b15c288 TJ |
850 | printk("ACCOUNT: ipt_account_get_ctl: wrong data size (%u != %u) for IPT_SO_GET_ACCOUNT_GET_HANDLE_USAGE\n", |
851 | *len, sizeof(struct ipt_account_handle_sockopt)); | |
852 | break; | |
2ea7a43c TJ |
853 | } |
854 | ||
06817fca | 855 | /* Find out how many handles are in use */ |
5b15c288 TJ |
856 | unsigned int i; |
857 | handle.itemcount = 0; | |
858 | spin_lock_bh(&ipt_account_userspace_lock); | |
859 | for (i = 0; i < ACCOUNT_MAX_HANDLES; i++) | |
860 | if (ipt_account_handles[i].data) | |
861 | handle.itemcount++; | |
862 | spin_unlock_bh(&ipt_account_userspace_lock); | |
2ea7a43c TJ |
863 | |
864 | if (copy_to_user(user, &handle, sizeof(struct ipt_account_handle_sockopt))) { | |
5b15c288 TJ |
865 | printk("ACCOUNT: ipt_account_set_ctl: copy_to_user failed for IPT_SO_GET_ACCOUNT_GET_HANDLE_USAGE\n"); |
866 | break; | |
867 | } | |
868 | ret = 0; | |
869 | break; | |
870 | } | |
2ea7a43c | 871 | case IPT_SO_GET_ACCOUNT_GET_TABLE_NAMES: { |
5b15c288 | 872 | spin_lock_bh(&ipt_account_lock); |
2ea7a43c | 873 | |
06817fca | 874 | /* Determine size of table names */ |
5b15c288 | 875 | unsigned int size = 0, i; |
2ea7a43c | 876 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) { |
5b15c288 TJ |
877 | if (ipt_account_tables[i].name[0] != 0) |
878 | size += strlen (ipt_account_tables[i].name) + 1; | |
879 | } | |
06817fca | 880 | size += 1; /* Terminating NULL character */ |
2ea7a43c TJ |
881 | |
882 | if (*len < size) { | |
5b15c288 TJ |
883 | spin_unlock_bh(&ipt_account_lock); |
884 | printk("ACCOUNT: ipt_account_get_ctl: not enough space (%u < %u) to store table names\n", *len, size); | |
885 | ret = -ENOMEM; | |
886 | break; | |
887 | } | |
06817fca | 888 | /* Copy table names to userspace */ |
5b15c288 | 889 | char *tnames = user; |
2ea7a43c TJ |
890 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) { |
891 | if (ipt_account_tables[i].name[0] != 0) { | |
5b15c288 | 892 | int len = strlen (ipt_account_tables[i].name) + 1; |
06817fca | 893 | copy_to_user(tnames, ipt_account_tables[i].name, len); /* copy string + terminating zero */ |
5b15c288 TJ |
894 | tnames += len; |
895 | } | |
896 | } | |
06817fca | 897 | /* Append terminating zero */ |
5b15c288 | 898 | i = 0; |
2ea7a43c | 899 | copy_to_user(tnames, &i, 1); |
5b15c288 TJ |
900 | spin_unlock_bh(&ipt_account_lock); |
901 | ret = 0; | |
902 | break; | |
903 | } | |
2ea7a43c TJ |
904 | default: |
905 | printk("ACCOUNT: ipt_account_get_ctl: unknown request %i\n", cmd); | |
bea3921b TJ |
906 | } |
907 | ||
908 | return ret; | |
909 | } | |
910 | ||
70288420 | 911 | static struct ipt_target ipt_account_reg |
2ea7a43c TJ |
912 | = { { |
913 | NULL, NULL | |
914 | } | |
915 | , "ACCOUNT", ipt_account_target, ipt_account_checkentry, ipt_account_deleteentry, | |
916 | THIS_MODULE | |
917 | }; | |
70288420 | 918 | |
bea3921b | 919 | static struct nf_sockopt_ops ipt_account_sockopts |
2ea7a43c TJ |
920 | = { { |
921 | NULL, NULL | |
922 | } | |
923 | , PF_INET, IPT_SO_SET_ACCOUNT_HANDLE_FREE, IPT_SO_SET_ACCOUNT_MAX+1, ipt_account_set_ctl, | |
924 | IPT_SO_GET_ACCOUNT_PREPARE_READ, IPT_SO_GET_ACCOUNT_MAX+1, ipt_account_get_ctl, 0, NULL | |
925 | }; | |
926 | ||
927 | static int __init init(void) { | |
2ea7a43c | 928 | if ((ipt_account_tables = kmalloc(ACCOUNT_MAX_TABLES*sizeof(struct ipt_account_table), GFP_KERNEL)) == NULL) { |
bea3921b TJ |
929 | printk("ACCOUNT: Out of memory allocating account_tables structure"); |
930 | return -EINVAL; | |
70288420 | 931 | } |
850cece6 | 932 | memset(ipt_account_tables, 0, ACCOUNT_MAX_TABLES*sizeof(struct ipt_account_table)); |
2ea7a43c TJ |
933 | |
934 | if ((ipt_account_handles = kmalloc(ACCOUNT_MAX_HANDLES*sizeof(struct ipt_account_handle), GFP_KERNEL)) == NULL) { | |
bea3921b TJ |
935 | printk("ACCOUNT: Out of memory allocating account_handles structure"); |
936 | kfree (ipt_account_tables); | |
937 | ipt_account_tables = NULL; | |
938 | return -EINVAL; | |
70288420 | 939 | } |
850cece6 | 940 | memset(ipt_account_handles, 0, ACCOUNT_MAX_HANDLES*sizeof(struct ipt_account_handle)); |
bea3921b | 941 | |
06817fca | 942 | /* Allocate one page as temporary storage */ |
2ea7a43c | 943 | if ((ipt_account_tmpbuf = (void*)__get_free_page(GFP_KERNEL)) == NULL) { |
9c44d30e | 944 | printk("ACCOUNT: Out of memory for temporary buffer page\n"); |
dbdd79c9 TJ |
945 | kfree(ipt_account_tables); |
946 | kfree(ipt_account_handles); | |
9c44d30e TJ |
947 | ipt_account_tables = NULL; |
948 | ipt_account_handles = NULL; | |
949 | return -EINVAL; | |
950 | } | |
2ea7a43c | 951 | |
bea3921b | 952 | /* Register setsockopt */ |
2ea7a43c | 953 | if (nf_register_sockopt(&ipt_account_sockopts) < 0) { |
bea3921b | 954 | printk("ACCOUNT: Can't register sockopts. Aborting\n"); |
2ea7a43c | 955 | |
dbdd79c9 | 956 | kfree(ipt_account_tables); |
bea3921b | 957 | kfree(ipt_account_handles); |
5b15c288 | 958 | free_page((unsigned long)ipt_account_tmpbuf); |
dbdd79c9 | 959 | ipt_account_tables = NULL; |
bea3921b | 960 | ipt_account_handles = NULL; |
dbdd79c9 | 961 | ipt_account_tmpbuf = NULL; |
2ea7a43c | 962 | |
bea3921b TJ |
963 | return -EINVAL; |
964 | } | |
2ea7a43c | 965 | |
70288420 | 966 | if (ipt_register_target(&ipt_account_reg)) |
2ea7a43c | 967 | return -EINVAL; |
70288420 TJ |
968 | |
969 | return 0; | |
970 | } | |
971 | ||
2ea7a43c | 972 | static void __exit fini(void) { |
70288420 TJ |
973 | ipt_unregister_target(&ipt_account_reg); |
974 | ||
bea3921b | 975 | nf_unregister_sockopt(&ipt_account_sockopts); |
2ea7a43c | 976 | |
70288420 | 977 | kfree(ipt_account_tables); |
70288420 | 978 | kfree(ipt_account_handles); |
5b15c288 | 979 | free_page((unsigned long)ipt_account_tmpbuf); |
2ea7a43c | 980 | |
dbdd79c9 | 981 | ipt_account_tables = NULL; |
70288420 | 982 | ipt_account_handles = NULL; |
dbdd79c9 | 983 | ipt_account_tmpbuf = NULL; |
70288420 TJ |
984 | } |
985 | ||
986 | module_init(init); | |
987 | module_exit(fini); | |
988 | MODULE_LICENSE("GPL"); |