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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) { |
8bea9bf9 | 140 | u_int32_t calc_mask, netsize=0; |
c6620097 | 141 | int j; /* needs to be signed, otherwise we risk endless loop */ |
07eb98b4 | 142 | |
70288420 | 143 | DEBUGP("ACCOUNT: Found free slot: %d\n", i); |
6803acfc | 144 | strncpy (ipt_acc_tables[i].name, name, ACCOUNT_TABLE_NAME_LEN-1); |
2ea7a43c | 145 | |
6803acfc TJ |
146 | ipt_acc_tables[i].ip = ip; |
147 | ipt_acc_tables[i].netmask = netmask; | |
2ea7a43c | 148 | |
06817fca | 149 | /* Calculate netsize */ |
70288420 | 150 | calc_mask = htonl(netmask); |
6fe5ced9 | 151 | for (j = 31; j >= 0; j--) { |
70288420 | 152 | if (calc_mask&(1<<j)) |
850cece6 | 153 | netsize++; |
70288420 TJ |
154 | else |
155 | break; | |
156 | } | |
2ea7a43c | 157 | |
06817fca | 158 | /* Calculate depth from netsize */ |
850cece6 | 159 | if (netsize >= 24) |
6803acfc | 160 | ipt_acc_tables[i].depth = 0; |
850cece6 | 161 | else if (netsize >= 16) |
6803acfc | 162 | ipt_acc_tables[i].depth = 1; |
850cece6 | 163 | else if(netsize >= 8) |
6803acfc | 164 | ipt_acc_tables[i].depth = 2; |
2ea7a43c | 165 | |
013fcc80 | 166 | DEBUGP("ACCOUNT: calculated netsize: %u -> " |
6803acfc TJ |
167 | "ipt_acc_table depth %u\n", netsize, |
168 | ipt_acc_tables[i].depth); | |
2ea7a43c | 169 | |
6803acfc TJ |
170 | ipt_acc_tables[i].refcount++; |
171 | if ((ipt_acc_tables[i].data | |
013fcc80 | 172 | = (void *)get_zeroed_page(GFP_ATOMIC)) == NULL) { |
850cece6 | 173 | printk("ACCOUNT: out of memory for data of table: %s\n", name); |
6803acfc TJ |
174 | memset(&ipt_acc_tables[i], 0, |
175 | sizeof(struct ipt_acc_table)); | |
70288420 TJ |
176 | return -1; |
177 | } | |
2ea7a43c | 178 | |
70288420 TJ |
179 | return i; |
180 | } | |
181 | } | |
2ea7a43c | 182 | |
06817fca | 183 | /* No free slot found */ |
013fcc80 GE |
184 | printk("ACCOUNT: No free table slot found (max: %d). " |
185 | "Please increase ACCOUNT_MAX_TABLES.\n", ACCOUNT_MAX_TABLES); | |
70288420 TJ |
186 | return -1; |
187 | } | |
188 | ||
6803acfc | 189 | static int ipt_acc_checkentry(const char *tablename, |
2ea7a43c TJ |
190 | const struct ipt_entry *e, |
191 | void *targinfo, | |
192 | unsigned int targinfosize, | |
e1b66101 TJ |
193 | unsigned int hook_mask) |
194 | { | |
6803acfc | 195 | struct ipt_acc_info *info = targinfo; |
07eb98b4 | 196 | int table_nr; |
2ea7a43c | 197 | |
6803acfc | 198 | if (targinfosize != IPT_ALIGN(sizeof(struct ipt_acc_info))) { |
70288420 | 199 | DEBUGP("ACCOUNT: targinfosize %u != %u\n", |
6803acfc | 200 | targinfosize, IPT_ALIGN(sizeof(struct ipt_acc_info))); |
70288420 TJ |
201 | return 0; |
202 | } | |
203 | ||
b8041594 | 204 | LOCK_BH(&ipt_acc_lock); |
07eb98b4 TJ |
205 | table_nr = ipt_acc_table_insert(info->table_name, info->net_ip, |
206 | info->net_mask); | |
b8041594 TJ |
207 | UNLOCK_BH(&ipt_acc_lock); |
208 | ||
2ea7a43c | 209 | if (table_nr == -1) { |
70288420 TJ |
210 | printk("ACCOUNT: Table insert problem. Aborting\n"); |
211 | return 0; | |
212 | } | |
013fcc80 GE |
213 | /* Table nr caching so we don't have to do an extra string compare |
214 | for every packet */ | |
70288420 | 215 | info->table_nr = table_nr; |
2ea7a43c | 216 | |
70288420 TJ |
217 | return 1; |
218 | } | |
219 | ||
0f549f69 | 220 | static void ipt_acc_deleteentry(void *targinfo, unsigned int targinfosize) |
e1b66101 | 221 | { |
6fe5ced9 | 222 | u_int32_t i; |
6803acfc | 223 | struct ipt_acc_info *info = targinfo; |
2ea7a43c | 224 | |
6803acfc | 225 | if (targinfosize != IPT_ALIGN(sizeof(struct ipt_acc_info))) { |
850cece6 | 226 | DEBUGP("ACCOUNT: targinfosize %u != %u\n", |
6803acfc | 227 | targinfosize, IPT_ALIGN(sizeof(struct ipt_acc_info))); |
850cece6 TJ |
228 | } |
229 | ||
b8041594 | 230 | LOCK_BH(&ipt_acc_lock); |
2ea7a43c | 231 | |
6803acfc | 232 | DEBUGP("ACCOUNT: ipt_acc_deleteentry called for table: %s (#%d)\n", |
013fcc80 | 233 | info->table_name, info->table_nr); |
2ea7a43c | 234 | |
06817fca | 235 | info->table_nr = -1; /* Set back to original state */ |
2ea7a43c | 236 | |
06817fca | 237 | /* Look for table */ |
2ea7a43c | 238 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) { |
6803acfc | 239 | if (strncmp(ipt_acc_tables[i].name, info->table_name, |
013fcc80 | 240 | ACCOUNT_TABLE_NAME_LEN) == 0) { |
850cece6 | 241 | DEBUGP("ACCOUNT: Found table at slot: %d\n", i); |
2ea7a43c | 242 | |
6803acfc | 243 | ipt_acc_tables[i].refcount--; |
013fcc80 | 244 | DEBUGP("ACCOUNT: Refcount left: %d\n", |
6803acfc | 245 | ipt_acc_tables[i].refcount); |
850cece6 | 246 | |
06817fca | 247 | /* Table not needed anymore? */ |
6803acfc | 248 | if (ipt_acc_tables[i].refcount == 0) { |
850cece6 | 249 | DEBUGP("ACCOUNT: Destroying table at slot: %d\n", i); |
6803acfc TJ |
250 | ipt_acc_data_free(ipt_acc_tables[i].data, |
251 | ipt_acc_tables[i].depth); | |
252 | memset(&ipt_acc_tables[i], 0, | |
253 | sizeof(struct ipt_acc_table)); | |
850cece6 | 254 | } |
2ea7a43c | 255 | |
b8041594 | 256 | UNLOCK_BH(&ipt_acc_lock); |
850cece6 TJ |
257 | return; |
258 | } | |
259 | } | |
260 | ||
06817fca | 261 | /* Table not found */ |
850cece6 | 262 | printk("ACCOUNT: Table %s not found for destroy\n", info->table_name); |
b8041594 | 263 | UNLOCK_BH(&ipt_acc_lock); |
850cece6 TJ |
264 | } |
265 | ||
0f549f69 | 266 | static void ipt_acc_depth0_insert(struct ipt_acc_mask_24 *mask_24, |
6fe5ced9 TJ |
267 | u_int32_t net_ip, u_int32_t netmask, |
268 | u_int32_t src_ip, u_int32_t dst_ip, | |
269 | u_int32_t size, u_int32_t *itemcount) | |
e1b66101 | 270 | { |
07eb98b4 TJ |
271 | unsigned char is_src = 0, is_dst = 0, src_slot, dst_slot; |
272 | char is_src_new_ip = 0, is_dst_new_ip = 0; /* Check if this entry is new */ | |
2ea7a43c | 273 | |
6803acfc | 274 | DEBUGP("ACCOUNT: ipt_acc_depth0_insert: %u.%u.%u.%u/%u.%u.%u.%u " |
013fcc80 GE |
275 | "for net %u.%u.%u.%u/%u.%u.%u.%u, size: %u\n", NIPQUAD(src_ip), |
276 | NIPQUAD(dst_ip), NIPQUAD(net_ip), NIPQUAD(netmask), size); | |
2ea7a43c | 277 | |
06817fca TJ |
278 | /* Check if src/dst is inside our network. */ |
279 | /* Special: net_ip = 0.0.0.0/0 gets stored as src in slot 0 */ | |
4068e14d TJ |
280 | if (!netmask) |
281 | src_ip = 0; | |
282 | if ((net_ip&netmask) == (src_ip&netmask)) | |
283 | is_src = 1; | |
284 | if ((net_ip&netmask) == (dst_ip&netmask) && netmask) | |
285 | is_dst = 1; | |
2ea7a43c TJ |
286 | |
287 | if (!is_src && !is_dst) { | |
013fcc80 GE |
288 | DEBUGP("ACCOUNT: Skipping packet %u.%u.%u.%u/%u.%u.%u.%u " |
289 | "for net %u.%u.%u.%u/%u.%u.%u.%u\n", NIPQUAD(src_ip), | |
290 | NIPQUAD(dst_ip), NIPQUAD(net_ip), NIPQUAD(netmask)); | |
4068e14d TJ |
291 | return; |
292 | } | |
2ea7a43c | 293 | |
06817fca | 294 | /* Calculate array positions */ |
07eb98b4 TJ |
295 | src_slot = (unsigned char)((src_ip&0xFF000000) >> 24); |
296 | dst_slot = (unsigned char)((dst_ip&0xFF000000) >> 24); | |
2ea7a43c | 297 | |
06817fca | 298 | /* Increase size counters */ |
2ea7a43c | 299 | if (is_src) { |
06817fca | 300 | /* Calculate network slot */ |
5dbfa65d | 301 | DEBUGP("ACCOUNT: Calculated SRC 8 bit network slot: %d\n", src_slot); |
013fcc80 GE |
302 | if (!mask_24->ip[src_slot].src_packets |
303 | && !mask_24->ip[src_slot].dst_packets) | |
fa9124c2 | 304 | is_src_new_ip = 1; |
2ea7a43c | 305 | |
ff4ee64d TJ |
306 | mask_24->ip[src_slot].src_packets++; |
307 | mask_24->ip[src_slot].src_bytes+=size; | |
4068e14d | 308 | } |
2ea7a43c | 309 | if (is_dst) { |
5dbfa65d | 310 | DEBUGP("ACCOUNT: Calculated DST 8 bit network slot: %d\n", dst_slot); |
013fcc80 GE |
311 | if (!mask_24->ip[dst_slot].src_packets |
312 | && !mask_24->ip[dst_slot].dst_packets) | |
fa9124c2 | 313 | is_dst_new_ip = 1; |
2ea7a43c | 314 | |
ff4ee64d TJ |
315 | mask_24->ip[dst_slot].dst_packets++; |
316 | mask_24->ip[dst_slot].dst_bytes+=size; | |
4068e14d | 317 | } |
2ea7a43c | 318 | |
06817fca | 319 | /* Increase itemcounter */ |
4adc8355 | 320 | DEBUGP("ACCOUNT: Itemcounter before: %d\n", *itemcount); |
2ea7a43c | 321 | if (src_slot == dst_slot) { |
4adc8355 | 322 | if (is_src_new_ip || is_dst_new_ip) { |
013fcc80 GE |
323 | DEBUGP("ACCOUNT: src_slot == dst_slot: %d, %d\n", |
324 | is_src_new_ip, is_dst_new_ip); | |
fa9124c2 | 325 | (*itemcount)++; |
4adc8355 | 326 | } |
fa9124c2 | 327 | } else { |
4adc8355 TJ |
328 | if (is_src_new_ip) { |
329 | DEBUGP("ACCOUNT: New src_ip: %u.%u.%u.%u\n", NIPQUAD(src_ip)); | |
fa9124c2 | 330 | (*itemcount)++; |
4adc8355 TJ |
331 | } |
332 | if (is_dst_new_ip) { | |
333 | DEBUGP("ACCOUNT: New dst_ip: %u.%u.%u.%u\n", NIPQUAD(dst_ip)); | |
fa9124c2 | 334 | (*itemcount)++; |
4adc8355 | 335 | } |
fa9124c2 | 336 | } |
4adc8355 | 337 | DEBUGP("ACCOUNT: Itemcounter after: %d\n", *itemcount); |
4068e14d TJ |
338 | } |
339 | ||
0f549f69 | 340 | static void ipt_acc_depth1_insert(struct ipt_acc_mask_16 *mask_16, |
6fe5ced9 TJ |
341 | u_int32_t net_ip, u_int32_t netmask, |
342 | u_int32_t src_ip, u_int32_t dst_ip, | |
343 | u_int32_t size, u_int32_t *itemcount) | |
e1b66101 | 344 | { |
06817fca | 345 | /* Do we need to process src IP? */ |
2ea7a43c | 346 | if ((net_ip&netmask) == (src_ip&netmask)) { |
4068e14d TJ |
347 | unsigned char slot = (unsigned char)((src_ip&0x00FF0000) >> 16); |
348 | DEBUGP("ACCOUNT: Calculated SRC 16 bit network slot: %d\n", slot); | |
2ea7a43c | 349 | |
06817fca | 350 | /* Do we need to create a new mask_24 bucket? */ |
013fcc80 GE |
351 | if (!mask_16->mask_24[slot] && (mask_16->mask_24[slot] = |
352 | (void *)get_zeroed_page(GFP_ATOMIC)) == NULL) { | |
4068e14d TJ |
353 | printk("ACCOUNT: Can't process packet because out of memory!\n"); |
354 | return; | |
355 | } | |
2ea7a43c | 356 | |
6803acfc | 357 | ipt_acc_depth0_insert((struct ipt_acc_mask_24 *)mask_16->mask_24[slot], |
013fcc80 | 358 | net_ip, netmask, src_ip, 0, size, itemcount); |
4068e14d | 359 | } |
2ea7a43c | 360 | |
06817fca | 361 | /* Do we need to process dst IP? */ |
2ea7a43c | 362 | if ((net_ip&netmask) == (dst_ip&netmask)) { |
4068e14d TJ |
363 | unsigned char slot = (unsigned char)((dst_ip&0x00FF0000) >> 16); |
364 | DEBUGP("ACCOUNT: Calculated DST 16 bit network slot: %d\n", slot); | |
2ea7a43c | 365 | |
06817fca | 366 | /* Do we need to create a new mask_24 bucket? */ |
013fcc80 GE |
367 | if (!mask_16->mask_24[slot] && (mask_16->mask_24[slot] |
368 | = (void *)get_zeroed_page(GFP_ATOMIC)) == NULL) { | |
4068e14d TJ |
369 | printk("ACCOUT: Can't process packet because out of memory!\n"); |
370 | return; | |
371 | } | |
2ea7a43c | 372 | |
6803acfc | 373 | ipt_acc_depth0_insert((struct ipt_acc_mask_24 *)mask_16->mask_24[slot], |
013fcc80 | 374 | net_ip, netmask, 0, dst_ip, size, itemcount); |
4068e14d TJ |
375 | } |
376 | } | |
377 | ||
0f549f69 | 378 | static void ipt_acc_depth2_insert(struct ipt_acc_mask_8 *mask_8, |
6fe5ced9 TJ |
379 | u_int32_t net_ip, u_int32_t netmask, |
380 | u_int32_t src_ip, u_int32_t dst_ip, | |
381 | u_int32_t size, u_int32_t *itemcount) | |
e1b66101 | 382 | { |
06817fca | 383 | /* Do we need to process src IP? */ |
2ea7a43c | 384 | if ((net_ip&netmask) == (src_ip&netmask)) { |
4068e14d TJ |
385 | unsigned char slot = (unsigned char)((src_ip&0x0000FF00) >> 8); |
386 | DEBUGP("ACCOUNT: Calculated SRC 24 bit network slot: %d\n", slot); | |
2ea7a43c | 387 | |
06817fca | 388 | /* Do we need to create a new mask_24 bucket? */ |
013fcc80 GE |
389 | if (!mask_8->mask_16[slot] && (mask_8->mask_16[slot] |
390 | = (void *)get_zeroed_page(GFP_ATOMIC)) == NULL) { | |
4068e14d TJ |
391 | printk("ACCOUNT: Can't process packet because out of memory!\n"); |
392 | return; | |
393 | } | |
2ea7a43c | 394 | |
6803acfc | 395 | ipt_acc_depth1_insert((struct ipt_acc_mask_16 *)mask_8->mask_16[slot], |
013fcc80 | 396 | net_ip, netmask, src_ip, 0, size, itemcount); |
4068e14d | 397 | } |
2ea7a43c | 398 | |
06817fca | 399 | /* Do we need to process dst IP? */ |
2ea7a43c | 400 | if ((net_ip&netmask) == (dst_ip&netmask)) { |
4068e14d TJ |
401 | unsigned char slot = (unsigned char)((dst_ip&0x0000FF00) >> 8); |
402 | DEBUGP("ACCOUNT: Calculated DST 24 bit network slot: %d\n", slot); | |
2ea7a43c | 403 | |
06817fca | 404 | /* Do we need to create a new mask_24 bucket? */ |
013fcc80 GE |
405 | if (!mask_8->mask_16[slot] && (mask_8->mask_16[slot] |
406 | = (void *)get_zeroed_page(GFP_ATOMIC)) == NULL) { | |
4068e14d TJ |
407 | printk("ACCOUNT: Can't process packet because out of memory!\n"); |
408 | return; | |
409 | } | |
2ea7a43c | 410 | |
6803acfc | 411 | ipt_acc_depth1_insert((struct ipt_acc_mask_16 *)mask_8->mask_16[slot], |
013fcc80 | 412 | net_ip, netmask, 0, dst_ip, size, itemcount); |
4068e14d TJ |
413 | } |
414 | } | |
415 | ||
6803acfc | 416 | static unsigned int ipt_acc_target(struct sk_buff **pskb, |
2ea7a43c TJ |
417 | const struct net_device *in, |
418 | const struct net_device *out, | |
2b0e6504 | 419 | unsigned int hooknum, |
2ea7a43c | 420 | const void *targinfo, |
e1b66101 TJ |
421 | void *userinfo) |
422 | { | |
6803acfc TJ |
423 | const struct ipt_acc_info *info = |
424 | (const struct ipt_acc_info *)targinfo; | |
6fe5ced9 TJ |
425 | u_int32_t src_ip = (*pskb)->nh.iph->saddr; |
426 | u_int32_t dst_ip = (*pskb)->nh.iph->daddr; | |
427 | u_int32_t size = ntohs((*pskb)->nh.iph->tot_len); | |
2ea7a43c | 428 | |
b8041594 | 429 | LOCK_BH(&ipt_acc_lock); |
2ea7a43c | 430 | |
6803acfc TJ |
431 | if (ipt_acc_tables[info->table_nr].name[0] == 0) { |
432 | printk("ACCOUNT: ipt_acc_target: Invalid table id %u. " | |
013fcc80 GE |
433 | "IPs %u.%u.%u.%u/%u.%u.%u.%u\n", info->table_nr, |
434 | NIPQUAD(src_ip), NIPQUAD(dst_ip)); | |
b8041594 | 435 | UNLOCK_BH(&ipt_acc_lock); |
4068e14d TJ |
436 | return IPT_CONTINUE; |
437 | } | |
2ea7a43c | 438 | |
06817fca | 439 | /* 8 bit network or "any" network */ |
6803acfc | 440 | if (ipt_acc_tables[info->table_nr].depth == 0) { |
06817fca | 441 | /* Count packet and check if the IP is new */ |
6803acfc TJ |
442 | ipt_acc_depth0_insert( |
443 | (struct ipt_acc_mask_24 *)ipt_acc_tables[info->table_nr].data, | |
444 | ipt_acc_tables[info->table_nr].ip, | |
445 | ipt_acc_tables[info->table_nr].netmask, | |
446 | src_ip, dst_ip, size, &ipt_acc_tables[info->table_nr].itemcount); | |
b8041594 | 447 | UNLOCK_BH(&ipt_acc_lock); |
4068e14d | 448 | return IPT_CONTINUE; |
2ea7a43c TJ |
449 | } |
450 | ||
06817fca | 451 | /* 16 bit network */ |
6803acfc TJ |
452 | if (ipt_acc_tables[info->table_nr].depth == 1) { |
453 | ipt_acc_depth1_insert( | |
454 | (struct ipt_acc_mask_16 *)ipt_acc_tables[info->table_nr].data, | |
455 | ipt_acc_tables[info->table_nr].ip, | |
456 | ipt_acc_tables[info->table_nr].netmask, | |
457 | src_ip, dst_ip, size, &ipt_acc_tables[info->table_nr].itemcount); | |
b8041594 | 458 | UNLOCK_BH(&ipt_acc_lock); |
4068e14d TJ |
459 | return IPT_CONTINUE; |
460 | } | |
2ea7a43c | 461 | |
06817fca | 462 | /* 24 bit network */ |
6803acfc TJ |
463 | if (ipt_acc_tables[info->table_nr].depth == 2) { |
464 | ipt_acc_depth2_insert( | |
465 | (struct ipt_acc_mask_8 *)ipt_acc_tables[info->table_nr].data, | |
466 | ipt_acc_tables[info->table_nr].ip, | |
467 | ipt_acc_tables[info->table_nr].netmask, | |
468 | src_ip, dst_ip, size, &ipt_acc_tables[info->table_nr].itemcount); | |
b8041594 | 469 | UNLOCK_BH(&ipt_acc_lock); |
4068e14d TJ |
470 | return IPT_CONTINUE; |
471 | } | |
2ea7a43c | 472 | |
6803acfc | 473 | printk("ACCOUNT: ipt_acc_target: Unable to process packet. " |
013fcc80 | 474 | "Table id %u. IPs %u.%u.%u.%u/%u.%u.%u.%u\n", |
2ea7a43c TJ |
475 | info->table_nr, NIPQUAD(src_ip), NIPQUAD(dst_ip)); |
476 | ||
b8041594 | 477 | UNLOCK_BH(&ipt_acc_lock); |
4068e14d TJ |
478 | return IPT_CONTINUE; |
479 | } | |
480 | ||
bea3921b TJ |
481 | /* |
482 | Functions dealing with "handles": | |
483 | Handles are snapshots of a accounting state. | |
484 | ||
485 | read snapshots are only for debugging the code | |
486 | and are very expensive concerning speed/memory | |
487 | compared to read_and_flush. | |
488 | ||
489 | The functions aren't protected by spinlocks themselves | |
490 | as this is done in the ioctl part of the code. | |
491 | */ | |
492 | ||
493 | /* | |
494 | Find a free handle slot. Normally only one should be used, | |
495 | but there could be two or more applications accessing the data | |
496 | at the same time. | |
497 | */ | |
0f549f69 | 498 | static int ipt_acc_handle_find_slot(void) |
e1b66101 | 499 | { |
6fe5ced9 | 500 | u_int32_t i; |
06817fca | 501 | /* Insert new table */ |
2ea7a43c | 502 | for (i = 0; i < ACCOUNT_MAX_HANDLES; i++) { |
06817fca | 503 | /* Found free slot */ |
6803acfc | 504 | if (ipt_acc_handles[i].data == NULL) { |
013fcc80 GE |
505 | /* Don't "mark" data as used as we are protected by a spinlock |
506 | by the calling function. handle_find_slot() is only a function | |
507 | to prevent code duplication. */ | |
bea3921b TJ |
508 | return i; |
509 | } | |
510 | } | |
2ea7a43c | 511 | |
06817fca | 512 | /* No free slot found */ |
013fcc80 GE |
513 | printk("ACCOUNT: No free handle slot found (max: %u). " |
514 | "Please increase ACCOUNT_MAX_HANDLES.\n", ACCOUNT_MAX_HANDLES); | |
bea3921b TJ |
515 | return -1; |
516 | } | |
517 | ||
0f549f69 | 518 | static int ipt_acc_handle_free(u_int32_t handle) |
e1b66101 | 519 | { |
2ea7a43c | 520 | if (handle >= ACCOUNT_MAX_HANDLES) { |
6803acfc | 521 | printk("ACCOUNT: Invalid handle for ipt_acc_handle_free() specified:" |
013fcc80 | 522 | " %u\n", handle); |
bea3921b TJ |
523 | return -EINVAL; |
524 | } | |
2ea7a43c | 525 | |
6803acfc TJ |
526 | ipt_acc_data_free(ipt_acc_handles[handle].data, |
527 | ipt_acc_handles[handle].depth); | |
528 | memset (&ipt_acc_handles[handle], 0, sizeof (struct ipt_acc_handle)); | |
bea3921b TJ |
529 | return 0; |
530 | } | |
531 | ||
532 | /* Prepare data for read without flush. Use only for debugging! | |
533 | Real applications should use read&flush as it's way more efficent */ | |
b8041594 TJ |
534 | static int ipt_acc_handle_prepare_read(char *tablename, |
535 | struct ipt_acc_handle *dest, u_int32_t *count) | |
e1b66101 | 536 | { |
b8041594 | 537 | int table_nr=-1; |
07eb98b4 | 538 | unsigned char depth; |
2ea7a43c | 539 | |
b8041594 TJ |
540 | for (table_nr = 0; table_nr < ACCOUNT_MAX_TABLES; table_nr++) |
541 | if (strncmp(ipt_acc_tables[table_nr].name, tablename, | |
542 | ACCOUNT_TABLE_NAME_LEN) == 0) | |
543 | break; | |
bea3921b | 544 | |
b8041594 | 545 | if (table_nr == ACCOUNT_MAX_TABLES) { |
6803acfc | 546 | printk("ACCOUNT: ipt_acc_handle_prepare_read(): " |
013fcc80 | 547 | "Table %s not found\n", tablename); |
bea3921b TJ |
548 | return -1; |
549 | } | |
2ea7a43c | 550 | |
06817fca | 551 | /* Fill up handle structure */ |
b8041594 TJ |
552 | dest->ip = ipt_acc_tables[table_nr].ip; |
553 | dest->depth = ipt_acc_tables[table_nr].depth; | |
554 | dest->itemcount = ipt_acc_tables[table_nr].itemcount; | |
2ea7a43c | 555 | |
06817fca | 556 | /* allocate "root" table */ |
b8041594 | 557 | if ((dest->data = (void*)get_zeroed_page(GFP_ATOMIC)) == NULL) { |
013fcc80 | 558 | printk("ACCOUNT: out of memory for root table " |
6803acfc | 559 | "in ipt_acc_handle_prepare_read()\n"); |
2ea7a43c | 560 | return -1; |
bea3921b | 561 | } |
2ea7a43c | 562 | |
06817fca | 563 | /* Recursive copy of complete data structure */ |
b8041594 | 564 | depth = dest->depth; |
2ea7a43c | 565 | if (depth == 0) { |
b8041594 | 566 | memcpy(dest->data, |
6803acfc TJ |
567 | ipt_acc_tables[table_nr].data, |
568 | sizeof(struct ipt_acc_mask_24)); | |
bea3921b | 569 | } else if (depth == 1) { |
6803acfc TJ |
570 | struct ipt_acc_mask_16 *src_16 = |
571 | (struct ipt_acc_mask_16 *)ipt_acc_tables[table_nr].data; | |
572 | struct ipt_acc_mask_16 *network_16 = | |
b8041594 | 573 | (struct ipt_acc_mask_16 *)dest->data; |
6fe5ced9 | 574 | u_int32_t b; |
2ea7a43c TJ |
575 | |
576 | for (b = 0; b <= 255; b++) { | |
577 | if (src_16->mask_24[b]) { | |
013fcc80 GE |
578 | if ((network_16->mask_24[b] = |
579 | (void*)get_zeroed_page(GFP_ATOMIC)) == NULL) { | |
580 | printk("ACCOUNT: out of memory during copy of 16 bit " | |
6803acfc | 581 | "network in ipt_acc_handle_prepare_read()\n"); |
b8041594 | 582 | ipt_acc_data_free(dest->data, depth); |
2ea7a43c | 583 | return -1; |
bea3921b | 584 | } |
2ea7a43c | 585 | |
013fcc80 | 586 | memcpy(network_16->mask_24[b], src_16->mask_24[b], |
6803acfc | 587 | sizeof(struct ipt_acc_mask_24)); |
bea3921b TJ |
588 | } |
589 | } | |
590 | } else if(depth == 2) { | |
6803acfc TJ |
591 | struct ipt_acc_mask_8 *src_8 = |
592 | (struct ipt_acc_mask_8 *)ipt_acc_tables[table_nr].data; | |
593 | struct ipt_acc_mask_8 *network_8 = | |
b8041594 | 594 | (struct ipt_acc_mask_8 *)dest->data; |
2b0e6504 TJ |
595 | struct ipt_acc_mask_16 *src_16, *network_16; |
596 | u_int32_t a, b; | |
2ea7a43c TJ |
597 | |
598 | for (a = 0; a <= 255; a++) { | |
599 | if (src_8->mask_16[a]) { | |
013fcc80 GE |
600 | if ((network_8->mask_16[a] = |
601 | (void*)get_zeroed_page(GFP_ATOMIC)) == NULL) { | |
602 | printk("ACCOUNT: out of memory during copy of 24 bit network" | |
6803acfc | 603 | " in ipt_acc_handle_prepare_read()\n"); |
b8041594 | 604 | ipt_acc_data_free(dest->data, depth); |
2ea7a43c | 605 | return -1; |
bea3921b TJ |
606 | } |
607 | ||
013fcc80 | 608 | memcpy(network_8->mask_16[a], src_8->mask_16[a], |
6803acfc | 609 | sizeof(struct ipt_acc_mask_16)); |
2ea7a43c | 610 | |
2b0e6504 TJ |
611 | src_16 = src_8->mask_16[a]; |
612 | network_16 = network_8->mask_16[a]; | |
2ea7a43c TJ |
613 | |
614 | for (b = 0; b <= 255; b++) { | |
615 | if (src_16->mask_24[b]) { | |
013fcc80 GE |
616 | if ((network_16->mask_24[b] = |
617 | (void*)get_zeroed_page(GFP_ATOMIC)) == NULL) { | |
618 | printk("ACCOUNT: out of memory during copy of 16 bit" | |
6803acfc | 619 | " network in ipt_acc_handle_prepare_read()\n"); |
b8041594 | 620 | ipt_acc_data_free(dest->data, depth); |
2ea7a43c | 621 | return -1; |
bea3921b | 622 | } |
2ea7a43c | 623 | |
013fcc80 | 624 | memcpy(network_16->mask_24[b], src_16->mask_24[b], |
6803acfc | 625 | sizeof(struct ipt_acc_mask_24)); |
bea3921b TJ |
626 | } |
627 | } | |
628 | } | |
629 | } | |
630 | } | |
631 | ||
6803acfc | 632 | *count = ipt_acc_tables[table_nr].itemcount; |
b8041594 TJ |
633 | |
634 | return 0; | |
bea3921b TJ |
635 | } |
636 | ||
637 | /* Prepare data for read and flush it */ | |
b8041594 TJ |
638 | static int ipt_acc_handle_prepare_read_flush(char *tablename, |
639 | struct ipt_acc_handle *dest, u_int32_t *count) | |
e1b66101 | 640 | { |
b8041594 | 641 | int table_nr; |
07eb98b4 | 642 | void *new_data_page; |
2ea7a43c | 643 | |
b8041594 TJ |
644 | for (table_nr = 0; table_nr < ACCOUNT_MAX_TABLES; table_nr++) |
645 | if (strncmp(ipt_acc_tables[table_nr].name, tablename, | |
646 | ACCOUNT_TABLE_NAME_LEN) == 0) | |
647 | break; | |
bea3921b | 648 | |
b8041594 | 649 | if (table_nr == ACCOUNT_MAX_TABLES) { |
6803acfc | 650 | printk("ACCOUNT: ipt_acc_handle_prepare_read_flush(): " |
013fcc80 | 651 | "Table %s not found\n", tablename); |
bea3921b TJ |
652 | return -1; |
653 | } | |
2ea7a43c | 654 | |
ad773892 | 655 | /* Try to allocate memory */ |
07eb98b4 | 656 | if (!(new_data_page = (void*)get_zeroed_page(GFP_ATOMIC))) { |
6803acfc | 657 | printk("ACCOUNT: ipt_acc_handle_prepare_read_flush(): " |
013fcc80 | 658 | "Out of memory!\n"); |
ad773892 TJ |
659 | return -1; |
660 | } | |
661 | ||
06817fca | 662 | /* Fill up handle structure */ |
b8041594 TJ |
663 | dest->ip = ipt_acc_tables[table_nr].ip; |
664 | dest->depth = ipt_acc_tables[table_nr].depth; | |
665 | dest->itemcount = ipt_acc_tables[table_nr].itemcount; | |
666 | dest->data = ipt_acc_tables[table_nr].data; | |
6803acfc | 667 | *count = ipt_acc_tables[table_nr].itemcount; |
bea3921b | 668 | |
06817fca | 669 | /* "Flush" table data */ |
6803acfc TJ |
670 | ipt_acc_tables[table_nr].data = new_data_page; |
671 | ipt_acc_tables[table_nr].itemcount = 0; | |
bea3921b | 672 | |
b8041594 | 673 | return 0; |
bea3921b TJ |
674 | } |
675 | ||
e1b66101 | 676 | /* Copy 8 bit network data into a prepared buffer. |
bea3921b | 677 | We only copy entries != 0 to increase performance. |
bea3921b | 678 | */ |
32cd84a6 TJ |
679 | static int ipt_acc_handle_copy_data(void *to_user, u_int32_t *to_user_pos, |
680 | u_int32_t *tmpbuf_pos, | |
6803acfc | 681 | struct ipt_acc_mask_24 *data, |
6fe5ced9 | 682 | u_int32_t net_ip, u_int32_t net_OR_mask) |
e1b66101 | 683 | { |
6803acfc | 684 | struct ipt_acc_handle_ip handle_ip; |
6fe5ced9 | 685 | u_int32_t handle_ip_size = sizeof (struct ipt_acc_handle_ip); |
6fe5ced9 | 686 | u_int32_t i; |
e1b66101 TJ |
687 | |
688 | for (i = 0; i <= 255; i++) { | |
689 | if (data->ip[i].src_packets || data->ip[i].dst_packets) { | |
690 | handle_ip.ip = net_ip | net_OR_mask | (i<<24); | |
691 | ||
692 | handle_ip.src_packets = data->ip[i].src_packets; | |
693 | handle_ip.src_bytes = data->ip[i].src_bytes; | |
694 | handle_ip.dst_packets = data->ip[i].dst_packets; | |
695 | handle_ip.dst_bytes = data->ip[i].dst_bytes; | |
696 | ||
697 | /* Temporary buffer full? Flush to userspace */ | |
32cd84a6 TJ |
698 | if (*tmpbuf_pos+handle_ip_size >= PAGE_SIZE) { |
699 | if (copy_to_user(to_user + *to_user_pos, ipt_acc_tmpbuf, | |
700 | *tmpbuf_pos)) | |
dc668ad3 | 701 | return -EFAULT; |
32cd84a6 TJ |
702 | *to_user_pos = *to_user_pos + *tmpbuf_pos; |
703 | *tmpbuf_pos = 0; | |
e1b66101 | 704 | } |
32cd84a6 TJ |
705 | memcpy(ipt_acc_tmpbuf+*tmpbuf_pos, &handle_ip, handle_ip_size); |
706 | *tmpbuf_pos += handle_ip_size; | |
e1b66101 TJ |
707 | } |
708 | } | |
dc668ad3 TJ |
709 | |
710 | return 0; | |
e1b66101 TJ |
711 | } |
712 | ||
713 | /* Copy the data from our internal structure | |
714 | We only copy entries != 0 to increase performance. | |
6803acfc | 715 | Overwrites ipt_acc_tmpbuf. |
e1b66101 | 716 | */ |
0f549f69 | 717 | static int ipt_acc_handle_get_data(u_int32_t handle, void *to_user) |
e1b66101 | 718 | { |
39f2f255 | 719 | u_int32_t to_user_pos=0, tmpbuf_pos=0, net_ip; |
07eb98b4 | 720 | unsigned char depth; |
bea3921b | 721 | |
2ea7a43c | 722 | if (handle >= ACCOUNT_MAX_HANDLES) { |
6803acfc | 723 | printk("ACCOUNT: invalid handle for ipt_acc_handle_get_data() " |
013fcc80 | 724 | "specified: %u\n", handle); |
bea3921b TJ |
725 | return -1; |
726 | } | |
2ea7a43c | 727 | |
6803acfc | 728 | if (ipt_acc_handles[handle].data == NULL) { |
bea3921b TJ |
729 | printk("ACCOUNT: handle %u is BROKEN: Contains no data\n", handle); |
730 | return -1; | |
731 | } | |
2ea7a43c | 732 | |
07eb98b4 TJ |
733 | net_ip = ipt_acc_handles[handle].ip; |
734 | depth = ipt_acc_handles[handle].depth; | |
2ea7a43c | 735 | |
06817fca | 736 | /* 8 bit network */ |
2ea7a43c | 737 | if (depth == 0) { |
6803acfc TJ |
738 | struct ipt_acc_mask_24 *network = |
739 | (struct ipt_acc_mask_24*)ipt_acc_handles[handle].data; | |
32cd84a6 TJ |
740 | if (ipt_acc_handle_copy_data(to_user, &to_user_pos, &tmpbuf_pos, |
741 | network, net_ip, 0)) | |
dc668ad3 | 742 | return -1; |
e1b66101 | 743 | |
06817fca | 744 | /* Flush remaining data to userspace */ |
9c44d30e | 745 | if (tmpbuf_pos) |
32cd84a6 | 746 | if (copy_to_user(to_user+to_user_pos, ipt_acc_tmpbuf, tmpbuf_pos)) |
6fe5ced9 | 747 | return -1; |
2ea7a43c | 748 | |
bea3921b TJ |
749 | return 0; |
750 | } | |
2ea7a43c | 751 | |
06817fca | 752 | /* 16 bit network */ |
2ea7a43c | 753 | if (depth == 1) { |
6803acfc TJ |
754 | struct ipt_acc_mask_16 *network_16 = |
755 | (struct ipt_acc_mask_16*)ipt_acc_handles[handle].data; | |
6fe5ced9 | 756 | u_int32_t b; |
2ea7a43c TJ |
757 | for (b = 0; b <= 255; b++) { |
758 | if (network_16->mask_24[b]) { | |
6803acfc TJ |
759 | struct ipt_acc_mask_24 *network = |
760 | (struct ipt_acc_mask_24*)network_16->mask_24[b]; | |
39f2f255 | 761 | if (ipt_acc_handle_copy_data(to_user, &to_user_pos, |
32cd84a6 | 762 | &tmpbuf_pos, network, net_ip, (b << 16))) |
dc668ad3 | 763 | return -1; |
bea3921b TJ |
764 | } |
765 | } | |
2ea7a43c | 766 | |
06817fca | 767 | /* Flush remaining data to userspace */ |
9c44d30e | 768 | if (tmpbuf_pos) |
32cd84a6 | 769 | if (copy_to_user(to_user+to_user_pos, ipt_acc_tmpbuf, tmpbuf_pos)) |
6fe5ced9 | 770 | return -1; |
2ea7a43c | 771 | |
bea3921b TJ |
772 | return 0; |
773 | } | |
2ea7a43c | 774 | |
06817fca | 775 | /* 24 bit network */ |
2ea7a43c | 776 | if (depth == 2) { |
6803acfc TJ |
777 | struct ipt_acc_mask_8 *network_8 = |
778 | (struct ipt_acc_mask_8*)ipt_acc_handles[handle].data; | |
6fe5ced9 | 779 | u_int32_t a, b; |
2ea7a43c TJ |
780 | for (a = 0; a <= 255; a++) { |
781 | if (network_8->mask_16[a]) { | |
6803acfc TJ |
782 | struct ipt_acc_mask_16 *network_16 = |
783 | (struct ipt_acc_mask_16*)network_8->mask_16[a]; | |
2ea7a43c TJ |
784 | for (b = 0; b <= 255; b++) { |
785 | if (network_16->mask_24[b]) { | |
6803acfc TJ |
786 | struct ipt_acc_mask_24 *network = |
787 | (struct ipt_acc_mask_24*)network_16->mask_24[b]; | |
39f2f255 | 788 | if (ipt_acc_handle_copy_data(to_user, |
32cd84a6 TJ |
789 | &to_user_pos, &tmpbuf_pos, |
790 | network, net_ip, (a << 8) | (b << 16))) | |
dc668ad3 | 791 | return -1; |
bea3921b TJ |
792 | } |
793 | } | |
794 | } | |
795 | } | |
2ea7a43c | 796 | |
06817fca | 797 | /* Flush remaining data to userspace */ |
9c44d30e | 798 | if (tmpbuf_pos) |
32cd84a6 | 799 | if (copy_to_user(to_user+to_user_pos, ipt_acc_tmpbuf, tmpbuf_pos)) |
6fe5ced9 | 800 | return -1; |
2ea7a43c | 801 | |
bea3921b TJ |
802 | return 0; |
803 | } | |
e1b66101 | 804 | |
bea3921b TJ |
805 | return -1; |
806 | } | |
807 | ||
6803acfc | 808 | static int ipt_acc_set_ctl(struct sock *sk, int cmd, |
6fe5ced9 | 809 | void *user, u_int32_t len) |
e1b66101 | 810 | { |
6803acfc | 811 | struct ipt_acc_handle_sockopt handle; |
bea3921b TJ |
812 | int ret = -EINVAL; |
813 | ||
814 | if (!capable(CAP_NET_ADMIN)) | |
2ea7a43c TJ |
815 | return -EPERM; |
816 | ||
817 | switch (cmd) { | |
818 | case IPT_SO_SET_ACCOUNT_HANDLE_FREE: | |
6803acfc TJ |
819 | if (len != sizeof(struct ipt_acc_handle_sockopt)) { |
820 | printk("ACCOUNT: ipt_acc_set_ctl: wrong data size (%u != %u) " | |
013fcc80 | 821 | "for IPT_SO_SET_HANDLE_FREE\n", |
6803acfc | 822 | len, sizeof(struct ipt_acc_handle_sockopt)); |
2ea7a43c TJ |
823 | break; |
824 | } | |
825 | ||
826 | if (copy_from_user (&handle, user, len)) { | |
6803acfc | 827 | printk("ACCOUNT: ipt_acc_set_ctl: copy_from_user failed for " |
013fcc80 | 828 | "IPT_SO_SET_HANDLE_FREE\n"); |
bea3921b | 829 | break; |
2ea7a43c TJ |
830 | } |
831 | ||
b8041594 | 832 | down(&ipt_acc_userspace_mutex); |
6803acfc | 833 | ret = ipt_acc_handle_free(handle.handle_nr); |
b8041594 | 834 | up(&ipt_acc_userspace_mutex); |
2ea7a43c TJ |
835 | break; |
836 | case IPT_SO_SET_ACCOUNT_HANDLE_FREE_ALL: { | |
6fe5ced9 | 837 | u_int32_t i; |
b8041594 | 838 | down(&ipt_acc_userspace_mutex); |
5b15c288 | 839 | for (i = 0; i < ACCOUNT_MAX_HANDLES; i++) |
6803acfc | 840 | ipt_acc_handle_free(i); |
b8041594 | 841 | up(&ipt_acc_userspace_mutex); |
5b15c288 TJ |
842 | ret = 0; |
843 | break; | |
844 | } | |
2ea7a43c | 845 | default: |
6803acfc | 846 | printk("ACCOUNT: ipt_acc_set_ctl: unknown request %i\n", cmd); |
bea3921b TJ |
847 | } |
848 | ||
849 | return ret; | |
850 | } | |
851 | ||
6803acfc | 852 | static int ipt_acc_get_ctl(struct sock *sk, int cmd, void *user, int *len) |
e1b66101 | 853 | { |
6803acfc | 854 | struct ipt_acc_handle_sockopt handle; |
bea3921b TJ |
855 | int ret = -EINVAL; |
856 | ||
857 | if (!capable(CAP_NET_ADMIN)) | |
2ea7a43c TJ |
858 | return -EPERM; |
859 | ||
860 | switch (cmd) { | |
861 | case IPT_SO_GET_ACCOUNT_PREPARE_READ_FLUSH: | |
b8041594 TJ |
862 | case IPT_SO_GET_ACCOUNT_PREPARE_READ: { |
863 | struct ipt_acc_handle dest; | |
864 | ||
865 | if (*len < sizeof(struct ipt_acc_handle_sockopt)) { | |
866 | printk("ACCOUNT: ipt_acc_get_ctl: wrong data size (%u != %u) " | |
867 | "for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n", | |
868 | *len, sizeof(struct ipt_acc_handle_sockopt)); | |
869 | break; | |
870 | } | |
871 | ||
872 | if (copy_from_user (&handle, user, | |
873 | sizeof(struct ipt_acc_handle_sockopt))) { | |
874 | return -EFAULT; | |
875 | break; | |
876 | } | |
877 | ||
878 | LOCK_BH(&ipt_acc_lock); | |
879 | if (cmd == IPT_SO_GET_ACCOUNT_PREPARE_READ_FLUSH) | |
880 | ret = ipt_acc_handle_prepare_read_flush( | |
881 | handle.name, &dest, &handle.itemcount); | |
882 | else | |
883 | ret = ipt_acc_handle_prepare_read( | |
884 | handle.name, &dest, &handle.itemcount); | |
885 | UNLOCK_BH(&ipt_acc_lock); | |
886 | // Error occured during prepare_read? | |
887 | if (ret == -1) | |
888 | return -EINVAL; | |
889 | ||
890 | /* Allocate a userspace handle */ | |
891 | down(&ipt_acc_userspace_mutex); | |
892 | if ((handle.handle_nr = ipt_acc_handle_find_slot()) == -1) { | |
893 | ipt_acc_data_free(dest.data, dest.depth); | |
8bea9bf9 | 894 | up(&ipt_acc_userspace_mutex); |
b8041594 TJ |
895 | return -EINVAL; |
896 | } | |
897 | memcpy(&ipt_acc_handles[handle.handle_nr], &dest, | |
898 | sizeof(struct ipt_acc_handle)); | |
899 | up(&ipt_acc_userspace_mutex); | |
900 | ||
901 | if (copy_to_user(user, &handle, | |
6803acfc | 902 | sizeof(struct ipt_acc_handle_sockopt))) { |
b8041594 TJ |
903 | return -EFAULT; |
904 | break; | |
905 | } | |
906 | ret = 0; | |
2ea7a43c TJ |
907 | break; |
908 | } | |
2ea7a43c | 909 | case IPT_SO_GET_ACCOUNT_GET_DATA: |
6803acfc TJ |
910 | if (*len < sizeof(struct ipt_acc_handle_sockopt)) { |
911 | printk("ACCOUNT: ipt_acc_get_ctl: wrong data size (%u != %u)" | |
013fcc80 | 912 | " for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n", |
6803acfc | 913 | *len, sizeof(struct ipt_acc_handle_sockopt)); |
2ea7a43c TJ |
914 | break; |
915 | } | |
916 | ||
013fcc80 | 917 | if (copy_from_user (&handle, user, |
6803acfc | 918 | sizeof(struct ipt_acc_handle_sockopt))) { |
230248c5 | 919 | return -EFAULT; |
2ea7a43c TJ |
920 | break; |
921 | } | |
922 | ||
923 | if (handle.handle_nr >= ACCOUNT_MAX_HANDLES) { | |
230248c5 | 924 | return -EINVAL; |
2ea7a43c TJ |
925 | break; |
926 | } | |
927 | ||
6803acfc TJ |
928 | if (*len < ipt_acc_handles[handle.handle_nr].itemcount |
929 | * sizeof(struct ipt_acc_handle_ip)) { | |
930 | printk("ACCOUNT: ipt_acc_get_ctl: not enough space (%u < %u)" | |
013fcc80 | 931 | " to store data from IPT_SO_GET_ACCOUNT_GET_DATA\n", |
6803acfc TJ |
932 | *len, ipt_acc_handles[handle.handle_nr].itemcount |
933 | * sizeof(struct ipt_acc_handle_ip)); | |
2ea7a43c | 934 | ret = -ENOMEM; |
bea3921b | 935 | break; |
2ea7a43c TJ |
936 | } |
937 | ||
b8041594 | 938 | down(&ipt_acc_userspace_mutex); |
6803acfc | 939 | ret = ipt_acc_handle_get_data(handle.handle_nr, user); |
b8041594 | 940 | up(&ipt_acc_userspace_mutex); |
2ea7a43c | 941 | if (ret) { |
6803acfc | 942 | printk("ACCOUNT: ipt_acc_get_ctl: ipt_acc_handle_get_data" |
013fcc80 | 943 | " failed for handle %u\n", handle.handle_nr); |
2ea7a43c TJ |
944 | break; |
945 | } | |
946 | ||
947 | ret = 0; | |
948 | break; | |
949 | case IPT_SO_GET_ACCOUNT_GET_HANDLE_USAGE: { | |
07eb98b4 | 950 | u_int32_t i; |
6803acfc TJ |
951 | if (*len < sizeof(struct ipt_acc_handle_sockopt)) { |
952 | printk("ACCOUNT: ipt_acc_get_ctl: wrong data size (%u != %u)" | |
013fcc80 | 953 | " for IPT_SO_GET_ACCOUNT_GET_HANDLE_USAGE\n", |
6803acfc | 954 | *len, sizeof(struct ipt_acc_handle_sockopt)); |
5b15c288 | 955 | break; |
2ea7a43c TJ |
956 | } |
957 | ||
06817fca | 958 | /* Find out how many handles are in use */ |
5b15c288 | 959 | handle.itemcount = 0; |
b8041594 | 960 | down(&ipt_acc_userspace_mutex); |
5b15c288 | 961 | for (i = 0; i < ACCOUNT_MAX_HANDLES; i++) |
6803acfc | 962 | if (ipt_acc_handles[i].data) |
5b15c288 | 963 | handle.itemcount++; |
b8041594 | 964 | up(&ipt_acc_userspace_mutex); |
2ea7a43c | 965 | |
013fcc80 | 966 | if (copy_to_user(user, &handle, |
6803acfc | 967 | sizeof(struct ipt_acc_handle_sockopt))) { |
230248c5 | 968 | return -EFAULT; |
5b15c288 TJ |
969 | break; |
970 | } | |
971 | ret = 0; | |
972 | break; | |
973 | } | |
2ea7a43c | 974 | case IPT_SO_GET_ACCOUNT_GET_TABLE_NAMES: { |
b8041594 | 975 | u_int32_t size = 0, i, name_len; |
07eb98b4 | 976 | char *tnames; |
b8041594 TJ |
977 | |
978 | LOCK_BH(&ipt_acc_lock); | |
2ea7a43c | 979 | |
06817fca | 980 | /* Determine size of table names */ |
2ea7a43c | 981 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) { |
6803acfc TJ |
982 | if (ipt_acc_tables[i].name[0] != 0) |
983 | size += strlen (ipt_acc_tables[i].name) + 1; | |
5b15c288 | 984 | } |
06817fca | 985 | size += 1; /* Terminating NULL character */ |
2ea7a43c | 986 | |
b8041594 TJ |
987 | if (*len < size || size > PAGE_SIZE) { |
988 | UNLOCK_BH(&ipt_acc_lock); | |
989 | printk("ACCOUNT: ipt_acc_get_ctl: not enough space (%u < %u < %lu)" | |
990 | " to store table names\n", *len, size, PAGE_SIZE); | |
5b15c288 TJ |
991 | ret = -ENOMEM; |
992 | break; | |
993 | } | |
06817fca | 994 | /* Copy table names to userspace */ |
b8041594 | 995 | tnames = ipt_acc_tmpbuf; |
2ea7a43c | 996 | for (i = 0; i < ACCOUNT_MAX_TABLES; i++) { |
6803acfc | 997 | if (ipt_acc_tables[i].name[0] != 0) { |
b8041594 TJ |
998 | name_len = strlen (ipt_acc_tables[i].name) + 1; |
999 | memcpy(tnames, ipt_acc_tables[i].name, name_len); | |
1000 | tnames += name_len; | |
5b15c288 TJ |
1001 | } |
1002 | } | |
b8041594 TJ |
1003 | UNLOCK_BH(&ipt_acc_lock); |
1004 | ||
1005 | /* Terminating NULL character */ | |
1006 | *tnames = 0; | |
1007 | ||
1008 | /* Transfer to userspace */ | |
1009 | if (copy_to_user(user, ipt_acc_tmpbuf, size)) | |
6fe5ced9 | 1010 | return -EFAULT; |
b8041594 | 1011 | |
5b15c288 TJ |
1012 | ret = 0; |
1013 | break; | |
1014 | } | |
2ea7a43c | 1015 | default: |
6803acfc | 1016 | printk("ACCOUNT: ipt_acc_get_ctl: unknown request %i\n", cmd); |
bea3921b TJ |
1017 | } |
1018 | ||
1019 | return ret; | |
1020 | } | |
1021 | ||
6803acfc | 1022 | static struct ipt_target ipt_acc_reg = { |
6fe5ced9 TJ |
1023 | .name = "ACCOUNT", |
1024 | .target = ipt_acc_target, | |
1025 | .checkentry = ipt_acc_checkentry, | |
1026 | .destroy = ipt_acc_deleteentry, | |
1027 | .me = THIS_MODULE | |
013fcc80 GE |
1028 | }; |
1029 | ||
6803acfc | 1030 | static struct nf_sockopt_ops ipt_acc_sockopts = { |
6fe5ced9 TJ |
1031 | .pf = PF_INET, |
1032 | .set_optmin = IPT_SO_SET_ACCOUNT_HANDLE_FREE, | |
1033 | .set_optmax = IPT_SO_SET_ACCOUNT_MAX+1, | |
1034 | .set = ipt_acc_set_ctl, | |
1035 | .get_optmin = IPT_SO_GET_ACCOUNT_PREPARE_READ, | |
1036 | .get_optmax = IPT_SO_GET_ACCOUNT_MAX+1, | |
1037 | .get = ipt_acc_get_ctl | |
013fcc80 | 1038 | }; |
2ea7a43c | 1039 | |
e1b66101 TJ |
1040 | static int __init init(void) |
1041 | { | |
b8041594 TJ |
1042 | init_MUTEX(&ipt_acc_userspace_mutex); |
1043 | ||
6803acfc | 1044 | if ((ipt_acc_tables = |
013fcc80 | 1045 | kmalloc(ACCOUNT_MAX_TABLES * |
6803acfc | 1046 | sizeof(struct ipt_acc_table), GFP_KERNEL)) == NULL) { |
bea3921b | 1047 | printk("ACCOUNT: Out of memory allocating account_tables structure"); |
6fe5ced9 | 1048 | goto error_cleanup; |
70288420 | 1049 | } |
6803acfc TJ |
1050 | memset(ipt_acc_tables, 0, |
1051 | ACCOUNT_MAX_TABLES * sizeof(struct ipt_acc_table)); | |
2ea7a43c | 1052 | |
6803acfc | 1053 | if ((ipt_acc_handles = |
013fcc80 | 1054 | kmalloc(ACCOUNT_MAX_HANDLES * |
6803acfc | 1055 | sizeof(struct ipt_acc_handle), GFP_KERNEL)) == NULL) { |
bea3921b | 1056 | printk("ACCOUNT: Out of memory allocating account_handles structure"); |
6fe5ced9 | 1057 | goto error_cleanup; |
70288420 | 1058 | } |
6803acfc TJ |
1059 | memset(ipt_acc_handles, 0, |
1060 | ACCOUNT_MAX_HANDLES * sizeof(struct ipt_acc_handle)); | |
bea3921b | 1061 | |
06817fca | 1062 | /* Allocate one page as temporary storage */ |
6803acfc | 1063 | if ((ipt_acc_tmpbuf = (void*)__get_free_page(GFP_KERNEL)) == NULL) { |
9c44d30e | 1064 | printk("ACCOUNT: Out of memory for temporary buffer page\n"); |
6fe5ced9 | 1065 | goto error_cleanup; |
9c44d30e | 1066 | } |
2ea7a43c | 1067 | |
bea3921b | 1068 | /* Register setsockopt */ |
6803acfc | 1069 | if (nf_register_sockopt(&ipt_acc_sockopts) < 0) { |
bea3921b | 1070 | printk("ACCOUNT: Can't register sockopts. Aborting\n"); |
6fe5ced9 | 1071 | goto error_cleanup; |
bea3921b | 1072 | } |
2ea7a43c | 1073 | |
6803acfc | 1074 | if (ipt_register_target(&ipt_acc_reg)) |
6fe5ced9 TJ |
1075 | goto error_cleanup; |
1076 | ||
70288420 | 1077 | return 0; |
6fe5ced9 TJ |
1078 | |
1079 | error_cleanup: | |
1080 | if(ipt_acc_tables) | |
1081 | kfree(ipt_acc_tables); | |
1082 | if(ipt_acc_handles) | |
1083 | kfree(ipt_acc_handles); | |
1084 | if (ipt_acc_tmpbuf) | |
1085 | free_page((unsigned long)ipt_acc_tmpbuf); | |
1086 | ||
1087 | return -EINVAL; | |
70288420 TJ |
1088 | } |
1089 | ||
e1b66101 TJ |
1090 | static void __exit fini(void) |
1091 | { | |
6803acfc | 1092 | ipt_unregister_target(&ipt_acc_reg); |
70288420 | 1093 | |
6803acfc | 1094 | nf_unregister_sockopt(&ipt_acc_sockopts); |
2ea7a43c | 1095 | |
6803acfc TJ |
1096 | kfree(ipt_acc_tables); |
1097 | kfree(ipt_acc_handles); | |
1098 | free_page((unsigned long)ipt_acc_tmpbuf); | |
70288420 TJ |
1099 | } |
1100 | ||
1101 | module_init(init); | |
1102 | module_exit(fini); | |
1103 | MODULE_LICENSE("GPL"); |