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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 | * * | |
7f30e02e | 6 | * Copyright (C) 2004-2005 by Intra2net AG * |
54756114 TJ |
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> | |
70288420 TJ |
18 | #include <net/icmp.h> |
19 | #include <net/udp.h> | |
20 | #include <net/tcp.h> | |
21 | #include <linux/netfilter_ipv4/ip_tables.h> | |
b8041594 TJ |
22 | #include <linux/netfilter_ipv4/lockhelp.h> |
23 | #include <asm/semaphore.h> | |
6fe5ced9 TJ |
24 | #include <linux/kernel.h> |
25 | #include <linux/mm.h> | |
26 | #include <linux/string.h> | |
27 | #include <asm/uaccess.h> | |
70288420 | 28 | |
70288420 TJ |
29 | #include <net/route.h> |
30 | #include <linux/netfilter_ipv4/ipt_ACCOUNT.h> | |
31 | ||
5b15c288 | 32 | #if 0 |
70288420 | 33 | #define DEBUGP printk |
5b15c288 TJ |
34 | #else |
35 | #define DEBUGP(format, args...) | |
36 | #endif | |
70288420 | 37 | |
ad773892 TJ |
38 | #if (PAGE_SIZE < 4096) |
39 | #error "ipt_ACCOUNT needs at least a PAGE_SIZE of 4096" | |
40 | #endif | |
41 | ||
491d7fff TJ |
42 | static struct ipt_acc_table *ipt_acc_tables = NULL; |
43 | static struct ipt_acc_handle *ipt_acc_handles = NULL; | |
44 | static void *ipt_acc_tmpbuf = NULL; | |
70288420 | 45 | |
2ea7a43c | 46 | /* Spinlock used for manipulating the current accounting tables/data */ |
b8041594 TJ |
47 | DECLARE_LOCK(ipt_acc_lock); |
48 | /* Mutex (semaphore) used for manipulating userspace handles/snapshot data */ | |
49 | static struct semaphore ipt_acc_userspace_mutex; | |
9c44d30e | 50 | |
70288420 | 51 | |
70288420 | 52 | /* Recursive free of all data structures */ |
0f549f69 | 53 | static void ipt_acc_data_free(void *data, unsigned char depth) |
e1b66101 | 54 | { |
2ea7a43c | 55 | /* Empty data set */ |
70288420 TJ |
56 | if (!data) |
57 | return; | |
2ea7a43c | 58 | |
06817fca | 59 | /* Free for 8 bit network */ |
2ea7a43c | 60 | if (depth == 0) { |
850cece6 | 61 | free_page((unsigned long)data); |
70288420 TJ |
62 | return; |
63 | } | |
2ea7a43c | 64 | |
06817fca | 65 | /* Free for 16 bit network */ |
2ea7a43c | 66 | if (depth == 1) { |
6803acfc | 67 | struct ipt_acc_mask_16 *mask_16 = (struct ipt_acc_mask_16 *)data; |
6fe5ced9 | 68 | u_int32_t b; |
2ea7a43c TJ |
69 | for (b=0; b <= 255; b++) { |
70 | if (mask_16->mask_24[b] != 0) { | |
850cece6 | 71 | free_page((unsigned long)mask_16->mask_24[b]); |
70288420 TJ |
72 | } |
73 | } | |
850cece6 | 74 | free_page((unsigned long)data); |
70288420 | 75 | return; |
2ea7a43c TJ |
76 | } |
77 | ||
06817fca | 78 | /* Free for 24 bit network */ |
497344b1 | 79 | if (depth == 2) { |
6fe5ced9 | 80 | u_int32_t a, b; |
2ea7a43c | 81 | for (a=0; a <= 255; a++) { |
6803acfc TJ |
82 | if (((struct ipt_acc_mask_8 *)data)->mask_16[a]) { |
83 | struct ipt_acc_mask_16 *mask_16 = (struct ipt_acc_mask_16*) | |
84 | ((struct ipt_acc_mask_8 *)data)->mask_16[a]; | |
e1b66101 | 85 | |
2ea7a43c | 86 | for (b=0; b <= 255; b++) { |
70288420 | 87 | if (mask_16->mask_24[b]) { |
850cece6 | 88 | free_page((unsigned long)mask_16->mask_24[b]); |
70288420 TJ |
89 | } |
90 | } | |
850cece6 | 91 | free_page((unsigned long)mask_16); |
70288420 TJ |
92 | } |
93 | } | |
850cece6 | 94 | free_page((unsigned long)data); |
70288420 TJ |
95 | return; |
96 | } | |
2ea7a43c | 97 | |
6803acfc | 98 | printk("ACCOUNT: ipt_acc_data_free called with unknown depth: %d\n", |
013fcc80 | 99 | depth); |
70288420 TJ |
100 | return; |
101 | } | |
102 | ||
013fcc80 GE |
103 | /* Look for existing table / insert new one. |
104 | Return internal ID or -1 on error */ | |
0f549f69 | 105 | static int ipt_acc_table_insert(char *name, u_int32_t ip, u_int32_t netmask) |
e1b66101 | 106 | { |
6fe5ced9 | 107 | u_int32_t i; |
70288420 | 108 | |
6803acfc | 109 | DEBUGP("ACCOUNT: ipt_acc_table_insert: %s, %u.%u.%u.%u/%u.%u.%u.%u\n", |
e1b66101 | 110 | name, NIPQUAD(ip), NIPQUAD(netmask)); |
70288420 | 111 | |
06817fca | 112 | /* Look for existing table */ |
2ea7a43c | 113 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) { |
6803acfc | 114 | if (strncmp(ipt_acc_tables[i].name, name, |
013fcc80 GE |
115 | ACCOUNT_TABLE_NAME_LEN) == 0) { |
116 | DEBUGP("ACCOUNT: Found existing slot: %d - " | |
117 | "%u.%u.%u.%u/%u.%u.%u.%u\n", i, | |
6803acfc TJ |
118 | NIPQUAD(ipt_acc_tables[i].ip), |
119 | NIPQUAD(ipt_acc_tables[i].netmask)); | |
013fcc80 | 120 | |
6803acfc TJ |
121 | if (ipt_acc_tables[i].ip != ip |
122 | || ipt_acc_tables[i].netmask != netmask) { | |
013fcc80 GE |
123 | printk("ACCOUNT: Table %s found, but IP/netmask mismatch. " |
124 | "IP/netmask found: %u.%u.%u.%u/%u.%u.%u.%u\n", | |
6803acfc TJ |
125 | name, NIPQUAD(ipt_acc_tables[i].ip), |
126 | NIPQUAD(ipt_acc_tables[i].netmask)); | |
70288420 TJ |
127 | return -1; |
128 | } | |
129 | ||
6803acfc TJ |
130 | ipt_acc_tables[i].refcount++; |
131 | DEBUGP("ACCOUNT: Refcount: %d\n", ipt_acc_tables[i].refcount); | |
70288420 TJ |
132 | return i; |
133 | } | |
134 | } | |
135 | ||
06817fca | 136 | /* Insert new table */ |
2ea7a43c | 137 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) { |
06817fca | 138 | /* Found free slot */ |
6803acfc | 139 | if (ipt_acc_tables[i].name[0] == 0) { |
07eb98b4 TJ |
140 | u_int32_t j, calc_mask, netsize=0; |
141 | ||
70288420 | 142 | DEBUGP("ACCOUNT: Found free slot: %d\n", i); |
6803acfc | 143 | strncpy (ipt_acc_tables[i].name, name, ACCOUNT_TABLE_NAME_LEN-1); |
2ea7a43c | 144 | |
6803acfc TJ |
145 | ipt_acc_tables[i].ip = ip; |
146 | ipt_acc_tables[i].netmask = netmask; | |
2ea7a43c | 147 | |
06817fca | 148 | /* Calculate netsize */ |
70288420 | 149 | calc_mask = htonl(netmask); |
6fe5ced9 | 150 | for (j = 31; j >= 0; j--) { |
70288420 | 151 | if (calc_mask&(1<<j)) |
850cece6 | 152 | netsize++; |
70288420 TJ |
153 | else |
154 | break; | |
155 | } | |
2ea7a43c | 156 | |
06817fca | 157 | /* Calculate depth from netsize */ |
850cece6 | 158 | if (netsize >= 24) |
6803acfc | 159 | ipt_acc_tables[i].depth = 0; |
850cece6 | 160 | else if (netsize >= 16) |
6803acfc | 161 | ipt_acc_tables[i].depth = 1; |
850cece6 | 162 | else if(netsize >= 8) |
6803acfc | 163 | ipt_acc_tables[i].depth = 2; |
2ea7a43c | 164 | |
013fcc80 | 165 | DEBUGP("ACCOUNT: calculated netsize: %u -> " |
6803acfc TJ |
166 | "ipt_acc_table depth %u\n", netsize, |
167 | ipt_acc_tables[i].depth); | |
2ea7a43c | 168 | |
6803acfc TJ |
169 | ipt_acc_tables[i].refcount++; |
170 | if ((ipt_acc_tables[i].data | |
013fcc80 | 171 | = (void *)get_zeroed_page(GFP_ATOMIC)) == NULL) { |
850cece6 | 172 | printk("ACCOUNT: out of memory for data of table: %s\n", name); |
6803acfc TJ |
173 | memset(&ipt_acc_tables[i], 0, |
174 | sizeof(struct ipt_acc_table)); | |
70288420 TJ |
175 | return -1; |
176 | } | |
2ea7a43c | 177 | |
70288420 TJ |
178 | return i; |
179 | } | |
180 | } | |
2ea7a43c | 181 | |
06817fca | 182 | /* No free slot found */ |
013fcc80 GE |
183 | printk("ACCOUNT: No free table slot found (max: %d). " |
184 | "Please increase ACCOUNT_MAX_TABLES.\n", ACCOUNT_MAX_TABLES); | |
70288420 TJ |
185 | return -1; |
186 | } | |
187 | ||
6803acfc | 188 | static int ipt_acc_checkentry(const char *tablename, |
2ea7a43c TJ |
189 | const struct ipt_entry *e, |
190 | void *targinfo, | |
191 | unsigned int targinfosize, | |
e1b66101 TJ |
192 | unsigned int hook_mask) |
193 | { | |
6803acfc | 194 | struct ipt_acc_info *info = targinfo; |
07eb98b4 | 195 | int table_nr; |
2ea7a43c | 196 | |
6803acfc | 197 | if (targinfosize != IPT_ALIGN(sizeof(struct ipt_acc_info))) { |
70288420 | 198 | DEBUGP("ACCOUNT: targinfosize %u != %u\n", |
6803acfc | 199 | targinfosize, IPT_ALIGN(sizeof(struct ipt_acc_info))); |
70288420 TJ |
200 | return 0; |
201 | } | |
202 | ||
b8041594 | 203 | LOCK_BH(&ipt_acc_lock); |
07eb98b4 TJ |
204 | table_nr = ipt_acc_table_insert(info->table_name, info->net_ip, |
205 | info->net_mask); | |
b8041594 TJ |
206 | UNLOCK_BH(&ipt_acc_lock); |
207 | ||
2ea7a43c | 208 | if (table_nr == -1) { |
70288420 TJ |
209 | printk("ACCOUNT: Table insert problem. Aborting\n"); |
210 | return 0; | |
211 | } | |
013fcc80 GE |
212 | /* Table nr caching so we don't have to do an extra string compare |
213 | for every packet */ | |
70288420 | 214 | info->table_nr = table_nr; |
2ea7a43c | 215 | |
70288420 TJ |
216 | return 1; |
217 | } | |
218 | ||
0f549f69 | 219 | static void ipt_acc_deleteentry(void *targinfo, unsigned int targinfosize) |
e1b66101 | 220 | { |
6fe5ced9 | 221 | u_int32_t i; |
6803acfc | 222 | struct ipt_acc_info *info = targinfo; |
2ea7a43c | 223 | |
6803acfc | 224 | if (targinfosize != IPT_ALIGN(sizeof(struct ipt_acc_info))) { |
850cece6 | 225 | DEBUGP("ACCOUNT: targinfosize %u != %u\n", |
6803acfc | 226 | targinfosize, IPT_ALIGN(sizeof(struct ipt_acc_info))); |
850cece6 TJ |
227 | } |
228 | ||
b8041594 | 229 | LOCK_BH(&ipt_acc_lock); |
2ea7a43c | 230 | |
6803acfc | 231 | DEBUGP("ACCOUNT: ipt_acc_deleteentry called for table: %s (#%d)\n", |
013fcc80 | 232 | info->table_name, info->table_nr); |
2ea7a43c | 233 | |
06817fca | 234 | info->table_nr = -1; /* Set back to original state */ |
2ea7a43c | 235 | |
06817fca | 236 | /* Look for table */ |
2ea7a43c | 237 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) { |
6803acfc | 238 | if (strncmp(ipt_acc_tables[i].name, info->table_name, |
013fcc80 | 239 | ACCOUNT_TABLE_NAME_LEN) == 0) { |
850cece6 | 240 | DEBUGP("ACCOUNT: Found table at slot: %d\n", i); |
2ea7a43c | 241 | |
6803acfc | 242 | ipt_acc_tables[i].refcount--; |
013fcc80 | 243 | DEBUGP("ACCOUNT: Refcount left: %d\n", |
6803acfc | 244 | ipt_acc_tables[i].refcount); |
850cece6 | 245 | |
06817fca | 246 | /* Table not needed anymore? */ |
6803acfc | 247 | if (ipt_acc_tables[i].refcount == 0) { |
850cece6 | 248 | DEBUGP("ACCOUNT: Destroying table at slot: %d\n", i); |
6803acfc TJ |
249 | ipt_acc_data_free(ipt_acc_tables[i].data, |
250 | ipt_acc_tables[i].depth); | |
251 | memset(&ipt_acc_tables[i], 0, | |
252 | sizeof(struct ipt_acc_table)); | |
850cece6 | 253 | } |
2ea7a43c | 254 | |
b8041594 | 255 | UNLOCK_BH(&ipt_acc_lock); |
850cece6 TJ |
256 | return; |
257 | } | |
258 | } | |
259 | ||
06817fca | 260 | /* Table not found */ |
850cece6 | 261 | printk("ACCOUNT: Table %s not found for destroy\n", info->table_name); |
b8041594 | 262 | UNLOCK_BH(&ipt_acc_lock); |
850cece6 TJ |
263 | } |
264 | ||
0f549f69 | 265 | static void ipt_acc_depth0_insert(struct ipt_acc_mask_24 *mask_24, |
6fe5ced9 TJ |
266 | u_int32_t net_ip, u_int32_t netmask, |
267 | u_int32_t src_ip, u_int32_t dst_ip, | |
268 | u_int32_t size, u_int32_t *itemcount) | |
e1b66101 | 269 | { |
07eb98b4 TJ |
270 | unsigned char is_src = 0, is_dst = 0, src_slot, dst_slot; |
271 | char is_src_new_ip = 0, is_dst_new_ip = 0; /* Check if this entry is new */ | |
2ea7a43c | 272 | |
6803acfc | 273 | DEBUGP("ACCOUNT: ipt_acc_depth0_insert: %u.%u.%u.%u/%u.%u.%u.%u " |
013fcc80 GE |
274 | "for net %u.%u.%u.%u/%u.%u.%u.%u, size: %u\n", NIPQUAD(src_ip), |
275 | NIPQUAD(dst_ip), NIPQUAD(net_ip), NIPQUAD(netmask), size); | |
2ea7a43c | 276 | |
06817fca TJ |
277 | /* Check if src/dst is inside our network. */ |
278 | /* Special: net_ip = 0.0.0.0/0 gets stored as src in slot 0 */ | |
4068e14d TJ |
279 | if (!netmask) |
280 | src_ip = 0; | |
281 | if ((net_ip&netmask) == (src_ip&netmask)) | |
282 | is_src = 1; | |
283 | if ((net_ip&netmask) == (dst_ip&netmask) && netmask) | |
284 | is_dst = 1; | |
2ea7a43c TJ |
285 | |
286 | if (!is_src && !is_dst) { | |
013fcc80 GE |
287 | DEBUGP("ACCOUNT: Skipping packet %u.%u.%u.%u/%u.%u.%u.%u " |
288 | "for net %u.%u.%u.%u/%u.%u.%u.%u\n", NIPQUAD(src_ip), | |
289 | NIPQUAD(dst_ip), NIPQUAD(net_ip), NIPQUAD(netmask)); | |
4068e14d TJ |
290 | return; |
291 | } | |
2ea7a43c | 292 | |
06817fca | 293 | /* Calculate array positions */ |
07eb98b4 TJ |
294 | src_slot = (unsigned char)((src_ip&0xFF000000) >> 24); |
295 | dst_slot = (unsigned char)((dst_ip&0xFF000000) >> 24); | |
2ea7a43c | 296 | |
06817fca | 297 | /* Increase size counters */ |
2ea7a43c | 298 | if (is_src) { |
06817fca | 299 | /* Calculate network slot */ |
5dbfa65d | 300 | DEBUGP("ACCOUNT: Calculated SRC 8 bit network slot: %d\n", src_slot); |
013fcc80 GE |
301 | if (!mask_24->ip[src_slot].src_packets |
302 | && !mask_24->ip[src_slot].dst_packets) | |
fa9124c2 | 303 | is_src_new_ip = 1; |
2ea7a43c | 304 | |
ff4ee64d TJ |
305 | mask_24->ip[src_slot].src_packets++; |
306 | mask_24->ip[src_slot].src_bytes+=size; | |
4068e14d | 307 | } |
2ea7a43c | 308 | if (is_dst) { |
5dbfa65d | 309 | DEBUGP("ACCOUNT: Calculated DST 8 bit network slot: %d\n", dst_slot); |
013fcc80 GE |
310 | if (!mask_24->ip[dst_slot].src_packets |
311 | && !mask_24->ip[dst_slot].dst_packets) | |
fa9124c2 | 312 | is_dst_new_ip = 1; |
2ea7a43c | 313 | |
ff4ee64d TJ |
314 | mask_24->ip[dst_slot].dst_packets++; |
315 | mask_24->ip[dst_slot].dst_bytes+=size; | |
4068e14d | 316 | } |
2ea7a43c | 317 | |
06817fca | 318 | /* Increase itemcounter */ |
4adc8355 | 319 | DEBUGP("ACCOUNT: Itemcounter before: %d\n", *itemcount); |
2ea7a43c | 320 | if (src_slot == dst_slot) { |
4adc8355 | 321 | if (is_src_new_ip || is_dst_new_ip) { |
013fcc80 GE |
322 | DEBUGP("ACCOUNT: src_slot == dst_slot: %d, %d\n", |
323 | is_src_new_ip, is_dst_new_ip); | |
fa9124c2 | 324 | (*itemcount)++; |
4adc8355 | 325 | } |
fa9124c2 | 326 | } else { |
4adc8355 TJ |
327 | if (is_src_new_ip) { |
328 | DEBUGP("ACCOUNT: New src_ip: %u.%u.%u.%u\n", NIPQUAD(src_ip)); | |
fa9124c2 | 329 | (*itemcount)++; |
4adc8355 TJ |
330 | } |
331 | if (is_dst_new_ip) { | |
332 | DEBUGP("ACCOUNT: New dst_ip: %u.%u.%u.%u\n", NIPQUAD(dst_ip)); | |
fa9124c2 | 333 | (*itemcount)++; |
4adc8355 | 334 | } |
fa9124c2 | 335 | } |
4adc8355 | 336 | DEBUGP("ACCOUNT: Itemcounter after: %d\n", *itemcount); |
4068e14d TJ |
337 | } |
338 | ||
0f549f69 | 339 | static void ipt_acc_depth1_insert(struct ipt_acc_mask_16 *mask_16, |
6fe5ced9 TJ |
340 | u_int32_t net_ip, u_int32_t netmask, |
341 | u_int32_t src_ip, u_int32_t dst_ip, | |
342 | u_int32_t size, u_int32_t *itemcount) | |
e1b66101 | 343 | { |
06817fca | 344 | /* Do we need to process src IP? */ |
2ea7a43c | 345 | if ((net_ip&netmask) == (src_ip&netmask)) { |
4068e14d TJ |
346 | unsigned char slot = (unsigned char)((src_ip&0x00FF0000) >> 16); |
347 | DEBUGP("ACCOUNT: Calculated SRC 16 bit network slot: %d\n", slot); | |
2ea7a43c | 348 | |
06817fca | 349 | /* Do we need to create a new mask_24 bucket? */ |
013fcc80 GE |
350 | if (!mask_16->mask_24[slot] && (mask_16->mask_24[slot] = |
351 | (void *)get_zeroed_page(GFP_ATOMIC)) == NULL) { | |
4068e14d TJ |
352 | printk("ACCOUNT: Can't process packet because out of memory!\n"); |
353 | return; | |
354 | } | |
2ea7a43c | 355 | |
6803acfc | 356 | ipt_acc_depth0_insert((struct ipt_acc_mask_24 *)mask_16->mask_24[slot], |
013fcc80 | 357 | net_ip, netmask, src_ip, 0, size, itemcount); |
4068e14d | 358 | } |
2ea7a43c | 359 | |
06817fca | 360 | /* Do we need to process dst IP? */ |
2ea7a43c | 361 | if ((net_ip&netmask) == (dst_ip&netmask)) { |
4068e14d TJ |
362 | unsigned char slot = (unsigned char)((dst_ip&0x00FF0000) >> 16); |
363 | DEBUGP("ACCOUNT: Calculated DST 16 bit network slot: %d\n", slot); | |
2ea7a43c | 364 | |
06817fca | 365 | /* Do we need to create a new mask_24 bucket? */ |
013fcc80 GE |
366 | if (!mask_16->mask_24[slot] && (mask_16->mask_24[slot] |
367 | = (void *)get_zeroed_page(GFP_ATOMIC)) == NULL) { | |
4068e14d TJ |
368 | printk("ACCOUT: Can't process packet because out of memory!\n"); |
369 | return; | |
370 | } | |
2ea7a43c | 371 | |
6803acfc | 372 | ipt_acc_depth0_insert((struct ipt_acc_mask_24 *)mask_16->mask_24[slot], |
013fcc80 | 373 | net_ip, netmask, 0, dst_ip, size, itemcount); |
4068e14d TJ |
374 | } |
375 | } | |
376 | ||
0f549f69 | 377 | static void ipt_acc_depth2_insert(struct ipt_acc_mask_8 *mask_8, |
6fe5ced9 TJ |
378 | u_int32_t net_ip, u_int32_t netmask, |
379 | u_int32_t src_ip, u_int32_t dst_ip, | |
380 | u_int32_t size, u_int32_t *itemcount) | |
e1b66101 | 381 | { |
06817fca | 382 | /* Do we need to process src IP? */ |
2ea7a43c | 383 | if ((net_ip&netmask) == (src_ip&netmask)) { |
4068e14d TJ |
384 | unsigned char slot = (unsigned char)((src_ip&0x0000FF00) >> 8); |
385 | DEBUGP("ACCOUNT: Calculated SRC 24 bit network slot: %d\n", slot); | |
2ea7a43c | 386 | |
06817fca | 387 | /* Do we need to create a new mask_24 bucket? */ |
013fcc80 GE |
388 | if (!mask_8->mask_16[slot] && (mask_8->mask_16[slot] |
389 | = (void *)get_zeroed_page(GFP_ATOMIC)) == NULL) { | |
4068e14d TJ |
390 | printk("ACCOUNT: Can't process packet because out of memory!\n"); |
391 | return; | |
392 | } | |
2ea7a43c | 393 | |
6803acfc | 394 | ipt_acc_depth1_insert((struct ipt_acc_mask_16 *)mask_8->mask_16[slot], |
013fcc80 | 395 | net_ip, netmask, src_ip, 0, size, itemcount); |
4068e14d | 396 | } |
2ea7a43c | 397 | |
06817fca | 398 | /* Do we need to process dst IP? */ |
2ea7a43c | 399 | if ((net_ip&netmask) == (dst_ip&netmask)) { |
4068e14d TJ |
400 | unsigned char slot = (unsigned char)((dst_ip&0x0000FF00) >> 8); |
401 | DEBUGP("ACCOUNT: Calculated DST 24 bit network slot: %d\n", slot); | |
2ea7a43c | 402 | |
06817fca | 403 | /* Do we need to create a new mask_24 bucket? */ |
013fcc80 GE |
404 | if (!mask_8->mask_16[slot] && (mask_8->mask_16[slot] |
405 | = (void *)get_zeroed_page(GFP_ATOMIC)) == NULL) { | |
4068e14d TJ |
406 | printk("ACCOUNT: Can't process packet because out of memory!\n"); |
407 | return; | |
408 | } | |
2ea7a43c | 409 | |
6803acfc | 410 | ipt_acc_depth1_insert((struct ipt_acc_mask_16 *)mask_8->mask_16[slot], |
013fcc80 | 411 | net_ip, netmask, 0, dst_ip, size, itemcount); |
4068e14d TJ |
412 | } |
413 | } | |
414 | ||
6803acfc | 415 | static unsigned int ipt_acc_target(struct sk_buff **pskb, |
2ea7a43c TJ |
416 | unsigned int hooknum, |
417 | const struct net_device *in, | |
418 | const struct net_device *out, | |
419 | const void *targinfo, | |
e1b66101 TJ |
420 | void *userinfo) |
421 | { | |
6803acfc TJ |
422 | const struct ipt_acc_info *info = |
423 | (const struct ipt_acc_info *)targinfo; | |
6fe5ced9 TJ |
424 | u_int32_t src_ip = (*pskb)->nh.iph->saddr; |
425 | u_int32_t dst_ip = (*pskb)->nh.iph->daddr; | |
426 | u_int32_t size = ntohs((*pskb)->nh.iph->tot_len); | |
2ea7a43c | 427 | |
b8041594 | 428 | LOCK_BH(&ipt_acc_lock); |
2ea7a43c | 429 | |
6803acfc TJ |
430 | if (ipt_acc_tables[info->table_nr].name[0] == 0) { |
431 | printk("ACCOUNT: ipt_acc_target: Invalid table id %u. " | |
013fcc80 GE |
432 | "IPs %u.%u.%u.%u/%u.%u.%u.%u\n", info->table_nr, |
433 | NIPQUAD(src_ip), NIPQUAD(dst_ip)); | |
b8041594 | 434 | UNLOCK_BH(&ipt_acc_lock); |
4068e14d TJ |
435 | return IPT_CONTINUE; |
436 | } | |
2ea7a43c | 437 | |
06817fca | 438 | /* 8 bit network or "any" network */ |
6803acfc | 439 | if (ipt_acc_tables[info->table_nr].depth == 0) { |
06817fca | 440 | /* Count packet and check if the IP is new */ |
6803acfc TJ |
441 | ipt_acc_depth0_insert( |
442 | (struct ipt_acc_mask_24 *)ipt_acc_tables[info->table_nr].data, | |
443 | ipt_acc_tables[info->table_nr].ip, | |
444 | ipt_acc_tables[info->table_nr].netmask, | |
445 | src_ip, dst_ip, size, &ipt_acc_tables[info->table_nr].itemcount); | |
b8041594 | 446 | UNLOCK_BH(&ipt_acc_lock); |
4068e14d | 447 | return IPT_CONTINUE; |
2ea7a43c TJ |
448 | } |
449 | ||
06817fca | 450 | /* 16 bit network */ |
6803acfc TJ |
451 | if (ipt_acc_tables[info->table_nr].depth == 1) { |
452 | ipt_acc_depth1_insert( | |
453 | (struct ipt_acc_mask_16 *)ipt_acc_tables[info->table_nr].data, | |
454 | ipt_acc_tables[info->table_nr].ip, | |
455 | ipt_acc_tables[info->table_nr].netmask, | |
456 | src_ip, dst_ip, size, &ipt_acc_tables[info->table_nr].itemcount); | |
b8041594 | 457 | UNLOCK_BH(&ipt_acc_lock); |
4068e14d TJ |
458 | return IPT_CONTINUE; |
459 | } | |
2ea7a43c | 460 | |
06817fca | 461 | /* 24 bit network */ |
6803acfc TJ |
462 | if (ipt_acc_tables[info->table_nr].depth == 2) { |
463 | ipt_acc_depth2_insert( | |
464 | (struct ipt_acc_mask_8 *)ipt_acc_tables[info->table_nr].data, | |
465 | ipt_acc_tables[info->table_nr].ip, | |
466 | ipt_acc_tables[info->table_nr].netmask, | |
467 | src_ip, dst_ip, size, &ipt_acc_tables[info->table_nr].itemcount); | |
b8041594 | 468 | UNLOCK_BH(&ipt_acc_lock); |
4068e14d TJ |
469 | return IPT_CONTINUE; |
470 | } | |
2ea7a43c | 471 | |
6803acfc | 472 | printk("ACCOUNT: ipt_acc_target: Unable to process packet. " |
013fcc80 | 473 | "Table id %u. IPs %u.%u.%u.%u/%u.%u.%u.%u\n", |
2ea7a43c TJ |
474 | info->table_nr, NIPQUAD(src_ip), NIPQUAD(dst_ip)); |
475 | ||
b8041594 | 476 | UNLOCK_BH(&ipt_acc_lock); |
4068e14d TJ |
477 | return IPT_CONTINUE; |
478 | } | |
479 | ||
bea3921b TJ |
480 | /* |
481 | Functions dealing with "handles": | |
482 | Handles are snapshots of a accounting state. | |
483 | ||
484 | read snapshots are only for debugging the code | |
485 | and are very expensive concerning speed/memory | |
486 | compared to read_and_flush. | |
487 | ||
488 | The functions aren't protected by spinlocks themselves | |
489 | as this is done in the ioctl part of the code. | |
490 | */ | |
491 | ||
492 | /* | |
493 | Find a free handle slot. Normally only one should be used, | |
494 | but there could be two or more applications accessing the data | |
495 | at the same time. | |
496 | */ | |
0f549f69 | 497 | static int ipt_acc_handle_find_slot(void) |
e1b66101 | 498 | { |
6fe5ced9 | 499 | u_int32_t i; |
06817fca | 500 | /* Insert new table */ |
2ea7a43c | 501 | for (i = 0; i < ACCOUNT_MAX_HANDLES; i++) { |
06817fca | 502 | /* Found free slot */ |
6803acfc | 503 | if (ipt_acc_handles[i].data == NULL) { |
013fcc80 GE |
504 | /* Don't "mark" data as used as we are protected by a spinlock |
505 | by the calling function. handle_find_slot() is only a function | |
506 | to prevent code duplication. */ | |
bea3921b TJ |
507 | return i; |
508 | } | |
509 | } | |
2ea7a43c | 510 | |
06817fca | 511 | /* No free slot found */ |
013fcc80 GE |
512 | printk("ACCOUNT: No free handle slot found (max: %u). " |
513 | "Please increase ACCOUNT_MAX_HANDLES.\n", ACCOUNT_MAX_HANDLES); | |
bea3921b TJ |
514 | return -1; |
515 | } | |
516 | ||
0f549f69 | 517 | static int ipt_acc_handle_free(u_int32_t handle) |
e1b66101 | 518 | { |
2ea7a43c | 519 | if (handle >= ACCOUNT_MAX_HANDLES) { |
6803acfc | 520 | printk("ACCOUNT: Invalid handle for ipt_acc_handle_free() specified:" |
013fcc80 | 521 | " %u\n", handle); |
bea3921b TJ |
522 | return -EINVAL; |
523 | } | |
2ea7a43c | 524 | |
6803acfc TJ |
525 | ipt_acc_data_free(ipt_acc_handles[handle].data, |
526 | ipt_acc_handles[handle].depth); | |
527 | memset (&ipt_acc_handles[handle], 0, sizeof (struct ipt_acc_handle)); | |
bea3921b TJ |
528 | return 0; |
529 | } | |
530 | ||
531 | /* Prepare data for read without flush. Use only for debugging! | |
532 | Real applications should use read&flush as it's way more efficent */ | |
b8041594 TJ |
533 | static int ipt_acc_handle_prepare_read(char *tablename, |
534 | struct ipt_acc_handle *dest, u_int32_t *count) | |
e1b66101 | 535 | { |
b8041594 | 536 | int table_nr=-1; |
07eb98b4 | 537 | unsigned char depth; |
2ea7a43c | 538 | |
b8041594 TJ |
539 | for (table_nr = 0; table_nr < ACCOUNT_MAX_TABLES; table_nr++) |
540 | if (strncmp(ipt_acc_tables[table_nr].name, tablename, | |
541 | ACCOUNT_TABLE_NAME_LEN) == 0) | |
542 | break; | |
bea3921b | 543 | |
b8041594 | 544 | if (table_nr == ACCOUNT_MAX_TABLES) { |
6803acfc | 545 | printk("ACCOUNT: ipt_acc_handle_prepare_read(): " |
013fcc80 | 546 | "Table %s not found\n", tablename); |
bea3921b TJ |
547 | return -1; |
548 | } | |
2ea7a43c | 549 | |
06817fca | 550 | /* Fill up handle structure */ |
b8041594 TJ |
551 | dest->ip = ipt_acc_tables[table_nr].ip; |
552 | dest->depth = ipt_acc_tables[table_nr].depth; | |
553 | dest->itemcount = ipt_acc_tables[table_nr].itemcount; | |
2ea7a43c | 554 | |
06817fca | 555 | /* allocate "root" table */ |
b8041594 | 556 | if ((dest->data = (void*)get_zeroed_page(GFP_ATOMIC)) == NULL) { |
013fcc80 | 557 | printk("ACCOUNT: out of memory for root table " |
6803acfc | 558 | "in ipt_acc_handle_prepare_read()\n"); |
2ea7a43c | 559 | return -1; |
bea3921b | 560 | } |
2ea7a43c | 561 | |
06817fca | 562 | /* Recursive copy of complete data structure */ |
b8041594 | 563 | depth = dest->depth; |
2ea7a43c | 564 | if (depth == 0) { |
b8041594 | 565 | memcpy(dest->data, |
6803acfc TJ |
566 | ipt_acc_tables[table_nr].data, |
567 | sizeof(struct ipt_acc_mask_24)); | |
bea3921b | 568 | } else if (depth == 1) { |
6803acfc TJ |
569 | struct ipt_acc_mask_16 *src_16 = |
570 | (struct ipt_acc_mask_16 *)ipt_acc_tables[table_nr].data; | |
571 | struct ipt_acc_mask_16 *network_16 = | |
b8041594 | 572 | (struct ipt_acc_mask_16 *)dest->data; |
6fe5ced9 | 573 | u_int32_t b; |
2ea7a43c TJ |
574 | |
575 | for (b = 0; b <= 255; b++) { | |
576 | if (src_16->mask_24[b]) { | |
013fcc80 GE |
577 | if ((network_16->mask_24[b] = |
578 | (void*)get_zeroed_page(GFP_ATOMIC)) == NULL) { | |
579 | printk("ACCOUNT: out of memory during copy of 16 bit " | |
6803acfc | 580 | "network in ipt_acc_handle_prepare_read()\n"); |
b8041594 | 581 | ipt_acc_data_free(dest->data, depth); |
2ea7a43c | 582 | return -1; |
bea3921b | 583 | } |
2ea7a43c | 584 | |
013fcc80 | 585 | memcpy(network_16->mask_24[b], src_16->mask_24[b], |
6803acfc | 586 | sizeof(struct ipt_acc_mask_24)); |
bea3921b TJ |
587 | } |
588 | } | |
589 | } else if(depth == 2) { | |
6803acfc TJ |
590 | struct ipt_acc_mask_8 *src_8 = |
591 | (struct ipt_acc_mask_8 *)ipt_acc_tables[table_nr].data; | |
592 | struct ipt_acc_mask_8 *network_8 = | |
b8041594 | 593 | (struct ipt_acc_mask_8 *)dest->data; |
6fe5ced9 | 594 | u_int32_t a; |
2ea7a43c TJ |
595 | |
596 | for (a = 0; a <= 255; a++) { | |
597 | if (src_8->mask_16[a]) { | |
013fcc80 GE |
598 | if ((network_8->mask_16[a] = |
599 | (void*)get_zeroed_page(GFP_ATOMIC)) == NULL) { | |
600 | printk("ACCOUNT: out of memory during copy of 24 bit network" | |
6803acfc | 601 | " in ipt_acc_handle_prepare_read()\n"); |
b8041594 | 602 | ipt_acc_data_free(dest->data, depth); |
2ea7a43c | 603 | return -1; |
bea3921b TJ |
604 | } |
605 | ||
013fcc80 | 606 | memcpy(network_8->mask_16[a], src_8->mask_16[a], |
6803acfc | 607 | sizeof(struct ipt_acc_mask_16)); |
2ea7a43c | 608 | |
6803acfc TJ |
609 | struct ipt_acc_mask_16 *src_16 = src_8->mask_16[a]; |
610 | struct ipt_acc_mask_16 *network_16 = network_8->mask_16[a]; | |
6fe5ced9 | 611 | u_int32_t b; |
2ea7a43c TJ |
612 | |
613 | for (b = 0; b <= 255; b++) { | |
614 | if (src_16->mask_24[b]) { | |
013fcc80 GE |
615 | if ((network_16->mask_24[b] = |
616 | (void*)get_zeroed_page(GFP_ATOMIC)) == NULL) { | |
617 | printk("ACCOUNT: out of memory during copy of 16 bit" | |
6803acfc | 618 | " network in ipt_acc_handle_prepare_read()\n"); |
b8041594 | 619 | ipt_acc_data_free(dest->data, depth); |
2ea7a43c | 620 | return -1; |
bea3921b | 621 | } |
2ea7a43c | 622 | |
013fcc80 | 623 | memcpy(network_16->mask_24[b], src_16->mask_24[b], |
6803acfc | 624 | sizeof(struct ipt_acc_mask_24)); |
bea3921b TJ |
625 | } |
626 | } | |
627 | } | |
628 | } | |
629 | } | |
630 | ||
6803acfc | 631 | *count = ipt_acc_tables[table_nr].itemcount; |
b8041594 TJ |
632 | |
633 | return 0; | |
bea3921b TJ |
634 | } |
635 | ||
636 | /* Prepare data for read and flush it */ | |
b8041594 TJ |
637 | static int ipt_acc_handle_prepare_read_flush(char *tablename, |
638 | struct ipt_acc_handle *dest, u_int32_t *count) | |
e1b66101 | 639 | { |
b8041594 | 640 | int table_nr; |
07eb98b4 | 641 | void *new_data_page; |
2ea7a43c | 642 | |
b8041594 TJ |
643 | for (table_nr = 0; table_nr < ACCOUNT_MAX_TABLES; table_nr++) |
644 | if (strncmp(ipt_acc_tables[table_nr].name, tablename, | |
645 | ACCOUNT_TABLE_NAME_LEN) == 0) | |
646 | break; | |
bea3921b | 647 | |
b8041594 | 648 | if (table_nr == ACCOUNT_MAX_TABLES) { |
6803acfc | 649 | printk("ACCOUNT: ipt_acc_handle_prepare_read_flush(): " |
013fcc80 | 650 | "Table %s not found\n", tablename); |
bea3921b TJ |
651 | return -1; |
652 | } | |
2ea7a43c | 653 | |
ad773892 | 654 | /* Try to allocate memory */ |
07eb98b4 | 655 | if (!(new_data_page = (void*)get_zeroed_page(GFP_ATOMIC))) { |
6803acfc | 656 | printk("ACCOUNT: ipt_acc_handle_prepare_read_flush(): " |
013fcc80 | 657 | "Out of memory!\n"); |
ad773892 TJ |
658 | return -1; |
659 | } | |
660 | ||
06817fca | 661 | /* Fill up handle structure */ |
b8041594 TJ |
662 | dest->ip = ipt_acc_tables[table_nr].ip; |
663 | dest->depth = ipt_acc_tables[table_nr].depth; | |
664 | dest->itemcount = ipt_acc_tables[table_nr].itemcount; | |
665 | dest->data = ipt_acc_tables[table_nr].data; | |
6803acfc | 666 | *count = ipt_acc_tables[table_nr].itemcount; |
bea3921b | 667 | |
06817fca | 668 | /* "Flush" table data */ |
6803acfc TJ |
669 | ipt_acc_tables[table_nr].data = new_data_page; |
670 | ipt_acc_tables[table_nr].itemcount = 0; | |
bea3921b | 671 | |
b8041594 | 672 | return 0; |
bea3921b TJ |
673 | } |
674 | ||
e1b66101 | 675 | /* Copy 8 bit network data into a prepared buffer. |
bea3921b | 676 | We only copy entries != 0 to increase performance. |
bea3921b | 677 | */ |
32cd84a6 TJ |
678 | static int ipt_acc_handle_copy_data(void *to_user, u_int32_t *to_user_pos, |
679 | u_int32_t *tmpbuf_pos, | |
6803acfc | 680 | struct ipt_acc_mask_24 *data, |
6fe5ced9 | 681 | u_int32_t net_ip, u_int32_t net_OR_mask) |
e1b66101 | 682 | { |
6803acfc | 683 | struct ipt_acc_handle_ip handle_ip; |
6fe5ced9 | 684 | u_int32_t handle_ip_size = sizeof (struct ipt_acc_handle_ip); |
6fe5ced9 | 685 | u_int32_t i; |
e1b66101 TJ |
686 | |
687 | for (i = 0; i <= 255; i++) { | |
688 | if (data->ip[i].src_packets || data->ip[i].dst_packets) { | |
689 | handle_ip.ip = net_ip | net_OR_mask | (i<<24); | |
690 | ||
691 | handle_ip.src_packets = data->ip[i].src_packets; | |
692 | handle_ip.src_bytes = data->ip[i].src_bytes; | |
693 | handle_ip.dst_packets = data->ip[i].dst_packets; | |
694 | handle_ip.dst_bytes = data->ip[i].dst_bytes; | |
695 | ||
696 | /* Temporary buffer full? Flush to userspace */ | |
32cd84a6 TJ |
697 | if (*tmpbuf_pos+handle_ip_size >= PAGE_SIZE) { |
698 | if (copy_to_user(to_user + *to_user_pos, ipt_acc_tmpbuf, | |
699 | *tmpbuf_pos)) | |
dc668ad3 | 700 | return -EFAULT; |
32cd84a6 TJ |
701 | *to_user_pos = *to_user_pos + *tmpbuf_pos; |
702 | *tmpbuf_pos = 0; | |
e1b66101 | 703 | } |
32cd84a6 TJ |
704 | memcpy(ipt_acc_tmpbuf+*tmpbuf_pos, &handle_ip, handle_ip_size); |
705 | *tmpbuf_pos += handle_ip_size; | |
e1b66101 TJ |
706 | } |
707 | } | |
dc668ad3 TJ |
708 | |
709 | return 0; | |
e1b66101 TJ |
710 | } |
711 | ||
712 | /* Copy the data from our internal structure | |
713 | We only copy entries != 0 to increase performance. | |
6803acfc | 714 | Overwrites ipt_acc_tmpbuf. |
e1b66101 | 715 | */ |
0f549f69 | 716 | static int ipt_acc_handle_get_data(u_int32_t handle, void *to_user) |
e1b66101 | 717 | { |
39f2f255 | 718 | u_int32_t to_user_pos=0, tmpbuf_pos=0, net_ip; |
07eb98b4 | 719 | unsigned char depth; |
bea3921b | 720 | |
2ea7a43c | 721 | if (handle >= ACCOUNT_MAX_HANDLES) { |
6803acfc | 722 | printk("ACCOUNT: invalid handle for ipt_acc_handle_get_data() " |
013fcc80 | 723 | "specified: %u\n", handle); |
bea3921b TJ |
724 | return -1; |
725 | } | |
2ea7a43c | 726 | |
6803acfc | 727 | if (ipt_acc_handles[handle].data == NULL) { |
bea3921b TJ |
728 | printk("ACCOUNT: handle %u is BROKEN: Contains no data\n", handle); |
729 | return -1; | |
730 | } | |
2ea7a43c | 731 | |
07eb98b4 TJ |
732 | net_ip = ipt_acc_handles[handle].ip; |
733 | depth = ipt_acc_handles[handle].depth; | |
2ea7a43c | 734 | |
06817fca | 735 | /* 8 bit network */ |
2ea7a43c | 736 | if (depth == 0) { |
6803acfc TJ |
737 | struct ipt_acc_mask_24 *network = |
738 | (struct ipt_acc_mask_24*)ipt_acc_handles[handle].data; | |
32cd84a6 TJ |
739 | if (ipt_acc_handle_copy_data(to_user, &to_user_pos, &tmpbuf_pos, |
740 | network, net_ip, 0)) | |
dc668ad3 | 741 | return -1; |
e1b66101 | 742 | |
06817fca | 743 | /* Flush remaining data to userspace */ |
9c44d30e | 744 | if (tmpbuf_pos) |
32cd84a6 | 745 | if (copy_to_user(to_user+to_user_pos, ipt_acc_tmpbuf, tmpbuf_pos)) |
6fe5ced9 | 746 | return -1; |
2ea7a43c | 747 | |
bea3921b TJ |
748 | return 0; |
749 | } | |
2ea7a43c | 750 | |
06817fca | 751 | /* 16 bit network */ |
2ea7a43c | 752 | if (depth == 1) { |
6803acfc TJ |
753 | struct ipt_acc_mask_16 *network_16 = |
754 | (struct ipt_acc_mask_16*)ipt_acc_handles[handle].data; | |
6fe5ced9 | 755 | u_int32_t b; |
2ea7a43c TJ |
756 | for (b = 0; b <= 255; b++) { |
757 | if (network_16->mask_24[b]) { | |
6803acfc TJ |
758 | struct ipt_acc_mask_24 *network = |
759 | (struct ipt_acc_mask_24*)network_16->mask_24[b]; | |
39f2f255 | 760 | if (ipt_acc_handle_copy_data(to_user, &to_user_pos, |
32cd84a6 | 761 | &tmpbuf_pos, network, net_ip, (b << 16))) |
dc668ad3 | 762 | return -1; |
bea3921b TJ |
763 | } |
764 | } | |
2ea7a43c | 765 | |
06817fca | 766 | /* Flush remaining data to userspace */ |
9c44d30e | 767 | if (tmpbuf_pos) |
32cd84a6 | 768 | if (copy_to_user(to_user+to_user_pos, ipt_acc_tmpbuf, tmpbuf_pos)) |
6fe5ced9 | 769 | return -1; |
2ea7a43c | 770 | |
bea3921b TJ |
771 | return 0; |
772 | } | |
2ea7a43c | 773 | |
06817fca | 774 | /* 24 bit network */ |
2ea7a43c | 775 | if (depth == 2) { |
6803acfc TJ |
776 | struct ipt_acc_mask_8 *network_8 = |
777 | (struct ipt_acc_mask_8*)ipt_acc_handles[handle].data; | |
6fe5ced9 | 778 | u_int32_t a, b; |
2ea7a43c TJ |
779 | for (a = 0; a <= 255; a++) { |
780 | if (network_8->mask_16[a]) { | |
6803acfc TJ |
781 | struct ipt_acc_mask_16 *network_16 = |
782 | (struct ipt_acc_mask_16*)network_8->mask_16[a]; | |
2ea7a43c TJ |
783 | for (b = 0; b <= 255; b++) { |
784 | if (network_16->mask_24[b]) { | |
6803acfc TJ |
785 | struct ipt_acc_mask_24 *network = |
786 | (struct ipt_acc_mask_24*)network_16->mask_24[b]; | |
39f2f255 | 787 | if (ipt_acc_handle_copy_data(to_user, |
32cd84a6 TJ |
788 | &to_user_pos, &tmpbuf_pos, |
789 | network, net_ip, (a << 8) | (b << 16))) | |
dc668ad3 | 790 | return -1; |
bea3921b TJ |
791 | } |
792 | } | |
793 | } | |
794 | } | |
2ea7a43c | 795 | |
06817fca | 796 | /* Flush remaining data to userspace */ |
9c44d30e | 797 | if (tmpbuf_pos) |
32cd84a6 | 798 | if (copy_to_user(to_user+to_user_pos, ipt_acc_tmpbuf, tmpbuf_pos)) |
6fe5ced9 | 799 | return -1; |
2ea7a43c | 800 | |
bea3921b TJ |
801 | return 0; |
802 | } | |
e1b66101 | 803 | |
bea3921b TJ |
804 | return -1; |
805 | } | |
806 | ||
6803acfc | 807 | static int ipt_acc_set_ctl(struct sock *sk, int cmd, |
6fe5ced9 | 808 | void *user, u_int32_t len) |
e1b66101 | 809 | { |
6803acfc | 810 | struct ipt_acc_handle_sockopt handle; |
bea3921b TJ |
811 | int ret = -EINVAL; |
812 | ||
813 | if (!capable(CAP_NET_ADMIN)) | |
2ea7a43c TJ |
814 | return -EPERM; |
815 | ||
816 | switch (cmd) { | |
817 | case IPT_SO_SET_ACCOUNT_HANDLE_FREE: | |
6803acfc TJ |
818 | if (len != sizeof(struct ipt_acc_handle_sockopt)) { |
819 | printk("ACCOUNT: ipt_acc_set_ctl: wrong data size (%u != %u) " | |
013fcc80 | 820 | "for IPT_SO_SET_HANDLE_FREE\n", |
6803acfc | 821 | len, sizeof(struct ipt_acc_handle_sockopt)); |
2ea7a43c TJ |
822 | break; |
823 | } | |
824 | ||
825 | if (copy_from_user (&handle, user, len)) { | |
6803acfc | 826 | printk("ACCOUNT: ipt_acc_set_ctl: copy_from_user failed for " |
013fcc80 | 827 | "IPT_SO_SET_HANDLE_FREE\n"); |
bea3921b | 828 | break; |
2ea7a43c TJ |
829 | } |
830 | ||
b8041594 | 831 | down(&ipt_acc_userspace_mutex); |
6803acfc | 832 | ret = ipt_acc_handle_free(handle.handle_nr); |
b8041594 | 833 | up(&ipt_acc_userspace_mutex); |
2ea7a43c TJ |
834 | break; |
835 | case IPT_SO_SET_ACCOUNT_HANDLE_FREE_ALL: { | |
6fe5ced9 | 836 | u_int32_t i; |
b8041594 | 837 | down(&ipt_acc_userspace_mutex); |
5b15c288 | 838 | for (i = 0; i < ACCOUNT_MAX_HANDLES; i++) |
6803acfc | 839 | ipt_acc_handle_free(i); |
b8041594 | 840 | up(&ipt_acc_userspace_mutex); |
5b15c288 TJ |
841 | ret = 0; |
842 | break; | |
843 | } | |
2ea7a43c | 844 | default: |
6803acfc | 845 | printk("ACCOUNT: ipt_acc_set_ctl: unknown request %i\n", cmd); |
bea3921b TJ |
846 | } |
847 | ||
848 | return ret; | |
849 | } | |
850 | ||
6803acfc | 851 | static int ipt_acc_get_ctl(struct sock *sk, int cmd, void *user, int *len) |
e1b66101 | 852 | { |
6803acfc | 853 | struct ipt_acc_handle_sockopt handle; |
bea3921b TJ |
854 | int ret = -EINVAL; |
855 | ||
856 | if (!capable(CAP_NET_ADMIN)) | |
2ea7a43c TJ |
857 | return -EPERM; |
858 | ||
859 | switch (cmd) { | |
860 | case IPT_SO_GET_ACCOUNT_PREPARE_READ_FLUSH: | |
b8041594 TJ |
861 | case IPT_SO_GET_ACCOUNT_PREPARE_READ: { |
862 | struct ipt_acc_handle dest; | |
863 | ||
864 | if (*len < sizeof(struct ipt_acc_handle_sockopt)) { | |
865 | printk("ACCOUNT: ipt_acc_get_ctl: wrong data size (%u != %u) " | |
866 | "for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n", | |
867 | *len, sizeof(struct ipt_acc_handle_sockopt)); | |
868 | break; | |
869 | } | |
870 | ||
871 | if (copy_from_user (&handle, user, | |
872 | sizeof(struct ipt_acc_handle_sockopt))) { | |
873 | return -EFAULT; | |
874 | break; | |
875 | } | |
876 | ||
877 | LOCK_BH(&ipt_acc_lock); | |
878 | if (cmd == IPT_SO_GET_ACCOUNT_PREPARE_READ_FLUSH) | |
879 | ret = ipt_acc_handle_prepare_read_flush( | |
880 | handle.name, &dest, &handle.itemcount); | |
881 | else | |
882 | ret = ipt_acc_handle_prepare_read( | |
883 | handle.name, &dest, &handle.itemcount); | |
884 | UNLOCK_BH(&ipt_acc_lock); | |
885 | // Error occured during prepare_read? | |
886 | if (ret == -1) | |
887 | return -EINVAL; | |
888 | ||
889 | /* Allocate a userspace handle */ | |
890 | down(&ipt_acc_userspace_mutex); | |
891 | if ((handle.handle_nr = ipt_acc_handle_find_slot()) == -1) { | |
892 | ipt_acc_data_free(dest.data, dest.depth); | |
893 | return -EINVAL; | |
894 | } | |
895 | memcpy(&ipt_acc_handles[handle.handle_nr], &dest, | |
896 | sizeof(struct ipt_acc_handle)); | |
897 | up(&ipt_acc_userspace_mutex); | |
898 | ||
899 | if (copy_to_user(user, &handle, | |
6803acfc | 900 | sizeof(struct ipt_acc_handle_sockopt))) { |
b8041594 TJ |
901 | return -EFAULT; |
902 | break; | |
903 | } | |
904 | ret = 0; | |
2ea7a43c TJ |
905 | break; |
906 | } | |
2ea7a43c | 907 | case IPT_SO_GET_ACCOUNT_GET_DATA: |
6803acfc TJ |
908 | if (*len < sizeof(struct ipt_acc_handle_sockopt)) { |
909 | printk("ACCOUNT: ipt_acc_get_ctl: wrong data size (%u != %u)" | |
013fcc80 | 910 | " for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n", |
6803acfc | 911 | *len, sizeof(struct ipt_acc_handle_sockopt)); |
2ea7a43c TJ |
912 | break; |
913 | } | |
914 | ||
013fcc80 | 915 | if (copy_from_user (&handle, user, |
6803acfc | 916 | sizeof(struct ipt_acc_handle_sockopt))) { |
230248c5 | 917 | return -EFAULT; |
2ea7a43c TJ |
918 | break; |
919 | } | |
920 | ||
921 | if (handle.handle_nr >= ACCOUNT_MAX_HANDLES) { | |
230248c5 | 922 | return -EINVAL; |
2ea7a43c TJ |
923 | break; |
924 | } | |
925 | ||
6803acfc TJ |
926 | if (*len < ipt_acc_handles[handle.handle_nr].itemcount |
927 | * sizeof(struct ipt_acc_handle_ip)) { | |
928 | printk("ACCOUNT: ipt_acc_get_ctl: not enough space (%u < %u)" | |
013fcc80 | 929 | " to store data from IPT_SO_GET_ACCOUNT_GET_DATA\n", |
6803acfc TJ |
930 | *len, ipt_acc_handles[handle.handle_nr].itemcount |
931 | * sizeof(struct ipt_acc_handle_ip)); | |
2ea7a43c | 932 | ret = -ENOMEM; |
bea3921b | 933 | break; |
2ea7a43c TJ |
934 | } |
935 | ||
b8041594 | 936 | down(&ipt_acc_userspace_mutex); |
6803acfc | 937 | ret = ipt_acc_handle_get_data(handle.handle_nr, user); |
b8041594 | 938 | up(&ipt_acc_userspace_mutex); |
2ea7a43c | 939 | if (ret) { |
6803acfc | 940 | printk("ACCOUNT: ipt_acc_get_ctl: ipt_acc_handle_get_data" |
013fcc80 | 941 | " failed for handle %u\n", handle.handle_nr); |
2ea7a43c TJ |
942 | break; |
943 | } | |
944 | ||
945 | ret = 0; | |
946 | break; | |
947 | case IPT_SO_GET_ACCOUNT_GET_HANDLE_USAGE: { | |
07eb98b4 | 948 | u_int32_t i; |
6803acfc TJ |
949 | if (*len < sizeof(struct ipt_acc_handle_sockopt)) { |
950 | printk("ACCOUNT: ipt_acc_get_ctl: wrong data size (%u != %u)" | |
013fcc80 | 951 | " for IPT_SO_GET_ACCOUNT_GET_HANDLE_USAGE\n", |
6803acfc | 952 | *len, sizeof(struct ipt_acc_handle_sockopt)); |
5b15c288 | 953 | break; |
2ea7a43c TJ |
954 | } |
955 | ||
06817fca | 956 | /* Find out how many handles are in use */ |
5b15c288 | 957 | handle.itemcount = 0; |
b8041594 | 958 | down(&ipt_acc_userspace_mutex); |
5b15c288 | 959 | for (i = 0; i < ACCOUNT_MAX_HANDLES; i++) |
6803acfc | 960 | if (ipt_acc_handles[i].data) |
5b15c288 | 961 | handle.itemcount++; |
b8041594 | 962 | up(&ipt_acc_userspace_mutex); |
2ea7a43c | 963 | |
013fcc80 | 964 | if (copy_to_user(user, &handle, |
6803acfc | 965 | sizeof(struct ipt_acc_handle_sockopt))) { |
230248c5 | 966 | return -EFAULT; |
5b15c288 TJ |
967 | break; |
968 | } | |
969 | ret = 0; | |
970 | break; | |
971 | } | |
2ea7a43c | 972 | case IPT_SO_GET_ACCOUNT_GET_TABLE_NAMES: { |
b8041594 | 973 | u_int32_t size = 0, i, name_len; |
07eb98b4 | 974 | char *tnames; |
b8041594 TJ |
975 | |
976 | LOCK_BH(&ipt_acc_lock); | |
2ea7a43c | 977 | |
06817fca | 978 | /* Determine size of table names */ |
2ea7a43c | 979 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) { |
6803acfc TJ |
980 | if (ipt_acc_tables[i].name[0] != 0) |
981 | size += strlen (ipt_acc_tables[i].name) + 1; | |
5b15c288 | 982 | } |
06817fca | 983 | size += 1; /* Terminating NULL character */ |
2ea7a43c | 984 | |
b8041594 TJ |
985 | if (*len < size || size > PAGE_SIZE) { |
986 | UNLOCK_BH(&ipt_acc_lock); | |
987 | printk("ACCOUNT: ipt_acc_get_ctl: not enough space (%u < %u < %lu)" | |
988 | " to store table names\n", *len, size, PAGE_SIZE); | |
5b15c288 TJ |
989 | ret = -ENOMEM; |
990 | break; | |
991 | } | |
06817fca | 992 | /* Copy table names to userspace */ |
b8041594 | 993 | tnames = ipt_acc_tmpbuf; |
2ea7a43c | 994 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) { |
6803acfc | 995 | if (ipt_acc_tables[i].name[0] != 0) { |
b8041594 TJ |
996 | name_len = strlen (ipt_acc_tables[i].name) + 1; |
997 | memcpy(tnames, ipt_acc_tables[i].name, name_len); | |
998 | tnames += name_len; | |
5b15c288 TJ |
999 | } |
1000 | } | |
b8041594 TJ |
1001 | UNLOCK_BH(&ipt_acc_lock); |
1002 | ||
1003 | /* Terminating NULL character */ | |
1004 | *tnames = 0; | |
1005 | ||
1006 | /* Transfer to userspace */ | |
1007 | if (copy_to_user(user, ipt_acc_tmpbuf, size)) | |
6fe5ced9 | 1008 | return -EFAULT; |
b8041594 | 1009 | |
5b15c288 TJ |
1010 | ret = 0; |
1011 | break; | |
1012 | } | |
2ea7a43c | 1013 | default: |
6803acfc | 1014 | printk("ACCOUNT: ipt_acc_get_ctl: unknown request %i\n", cmd); |
bea3921b TJ |
1015 | } |
1016 | ||
1017 | return ret; | |
1018 | } | |
1019 | ||
6803acfc | 1020 | static struct ipt_target ipt_acc_reg = { |
6fe5ced9 TJ |
1021 | .name = "ACCOUNT", |
1022 | .target = ipt_acc_target, | |
1023 | .checkentry = ipt_acc_checkentry, | |
1024 | .destroy = ipt_acc_deleteentry, | |
1025 | .me = THIS_MODULE | |
013fcc80 GE |
1026 | }; |
1027 | ||
6803acfc | 1028 | static struct nf_sockopt_ops ipt_acc_sockopts = { |
6fe5ced9 TJ |
1029 | .pf = PF_INET, |
1030 | .set_optmin = IPT_SO_SET_ACCOUNT_HANDLE_FREE, | |
1031 | .set_optmax = IPT_SO_SET_ACCOUNT_MAX+1, | |
1032 | .set = ipt_acc_set_ctl, | |
1033 | .get_optmin = IPT_SO_GET_ACCOUNT_PREPARE_READ, | |
1034 | .get_optmax = IPT_SO_GET_ACCOUNT_MAX+1, | |
1035 | .get = ipt_acc_get_ctl | |
013fcc80 | 1036 | }; |
2ea7a43c | 1037 | |
e1b66101 TJ |
1038 | static int __init init(void) |
1039 | { | |
b8041594 TJ |
1040 | init_MUTEX(&ipt_acc_userspace_mutex); |
1041 | ||
6803acfc | 1042 | if ((ipt_acc_tables = |
013fcc80 | 1043 | kmalloc(ACCOUNT_MAX_TABLES * |
6803acfc | 1044 | sizeof(struct ipt_acc_table), GFP_KERNEL)) == NULL) { |
bea3921b | 1045 | printk("ACCOUNT: Out of memory allocating account_tables structure"); |
6fe5ced9 | 1046 | goto error_cleanup; |
70288420 | 1047 | } |
6803acfc TJ |
1048 | memset(ipt_acc_tables, 0, |
1049 | ACCOUNT_MAX_TABLES * sizeof(struct ipt_acc_table)); | |
2ea7a43c | 1050 | |
6803acfc | 1051 | if ((ipt_acc_handles = |
013fcc80 | 1052 | kmalloc(ACCOUNT_MAX_HANDLES * |
6803acfc | 1053 | sizeof(struct ipt_acc_handle), GFP_KERNEL)) == NULL) { |
bea3921b | 1054 | printk("ACCOUNT: Out of memory allocating account_handles structure"); |
6fe5ced9 | 1055 | goto error_cleanup; |
70288420 | 1056 | } |
6803acfc TJ |
1057 | memset(ipt_acc_handles, 0, |
1058 | ACCOUNT_MAX_HANDLES * sizeof(struct ipt_acc_handle)); | |
bea3921b | 1059 | |
06817fca | 1060 | /* Allocate one page as temporary storage */ |
6803acfc | 1061 | if ((ipt_acc_tmpbuf = (void*)__get_free_page(GFP_KERNEL)) == NULL) { |
9c44d30e | 1062 | printk("ACCOUNT: Out of memory for temporary buffer page\n"); |
6fe5ced9 | 1063 | goto error_cleanup; |
9c44d30e | 1064 | } |
2ea7a43c | 1065 | |
bea3921b | 1066 | /* Register setsockopt */ |
6803acfc | 1067 | if (nf_register_sockopt(&ipt_acc_sockopts) < 0) { |
bea3921b | 1068 | printk("ACCOUNT: Can't register sockopts. Aborting\n"); |
6fe5ced9 | 1069 | goto error_cleanup; |
bea3921b | 1070 | } |
2ea7a43c | 1071 | |
6803acfc | 1072 | if (ipt_register_target(&ipt_acc_reg)) |
6fe5ced9 TJ |
1073 | goto error_cleanup; |
1074 | ||
70288420 | 1075 | return 0; |
6fe5ced9 TJ |
1076 | |
1077 | error_cleanup: | |
1078 | if(ipt_acc_tables) | |
1079 | kfree(ipt_acc_tables); | |
1080 | if(ipt_acc_handles) | |
1081 | kfree(ipt_acc_handles); | |
1082 | if (ipt_acc_tmpbuf) | |
1083 | free_page((unsigned long)ipt_acc_tmpbuf); | |
1084 | ||
1085 | return -EINVAL; | |
70288420 TJ |
1086 | } |
1087 | ||
e1b66101 TJ |
1088 | static void __exit fini(void) |
1089 | { | |
6803acfc | 1090 | ipt_unregister_target(&ipt_acc_reg); |
70288420 | 1091 | |
6803acfc | 1092 | nf_unregister_sockopt(&ipt_acc_sockopts); |
2ea7a43c | 1093 | |
6803acfc TJ |
1094 | kfree(ipt_acc_tables); |
1095 | kfree(ipt_acc_handles); | |
1096 | free_page((unsigned long)ipt_acc_tmpbuf); | |
70288420 TJ |
1097 | } |
1098 | ||
1099 | module_init(init); | |
1100 | module_exit(fini); | |
1101 | MODULE_LICENSE("GPL"); |