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Commit | Line | Data |
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404bdbfd PM |
1 | /* |
2 | * Copyright (c) 2006 Patrick McHardy <kaber@trash.net> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This is a replacement of the old ipt_recent module, which carried the | |
9 | * following copyright notice: | |
10 | * | |
11 | * Author: Stephen Frost <sfrost@snowman.net> | |
12 | * Copyright 2002-2003, Stephen Frost, 2.5.x port by laforge@netfilter.org | |
13 | */ | |
14 | #include <linux/init.h> | |
6709dbbb | 15 | #include <linux/ip.h> |
404bdbfd | 16 | #include <linux/moduleparam.h> |
1da177e4 | 17 | #include <linux/proc_fs.h> |
404bdbfd PM |
18 | #include <linux/seq_file.h> |
19 | #include <linux/string.h> | |
1da177e4 | 20 | #include <linux/ctype.h> |
404bdbfd PM |
21 | #include <linux/list.h> |
22 | #include <linux/random.h> | |
23 | #include <linux/jhash.h> | |
24 | #include <linux/bitops.h> | |
25 | #include <linux/skbuff.h> | |
26 | #include <linux/inet.h> | |
457c4cbc | 27 | #include <net/net_namespace.h> |
1da177e4 | 28 | |
6709dbbb | 29 | #include <linux/netfilter/x_tables.h> |
1da177e4 LT |
30 | #include <linux/netfilter_ipv4/ipt_recent.h> |
31 | ||
404bdbfd | 32 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
2ae15b64 | 33 | MODULE_DESCRIPTION("Xtables: \"recently-seen\" host matching for IPv4"); |
404bdbfd | 34 | MODULE_LICENSE("GPL"); |
1da177e4 | 35 | |
e7be6994 PM |
36 | static unsigned int ip_list_tot = 100; |
37 | static unsigned int ip_pkt_list_tot = 20; | |
38 | static unsigned int ip_list_hash_size = 0; | |
39 | static unsigned int ip_list_perms = 0644; | |
b93ff783 DDG |
40 | static unsigned int ip_list_uid = 0; |
41 | static unsigned int ip_list_gid = 0; | |
e7be6994 PM |
42 | module_param(ip_list_tot, uint, 0400); |
43 | module_param(ip_pkt_list_tot, uint, 0400); | |
44 | module_param(ip_list_hash_size, uint, 0400); | |
45 | module_param(ip_list_perms, uint, 0400); | |
b93ff783 DDG |
46 | module_param(ip_list_uid, uint, 0400); |
47 | module_param(ip_list_gid, uint, 0400); | |
404bdbfd PM |
48 | MODULE_PARM_DESC(ip_list_tot, "number of IPs to remember per list"); |
49 | MODULE_PARM_DESC(ip_pkt_list_tot, "number of packets per IP to remember (max. 255)"); | |
50 | MODULE_PARM_DESC(ip_list_hash_size, "size of hash table used to look up IPs"); | |
51 | MODULE_PARM_DESC(ip_list_perms, "permissions on /proc/net/ipt_recent/* files"); | |
b93ff783 DDG |
52 | MODULE_PARM_DESC(ip_list_uid,"owner of /proc/net/ipt_recent/* files"); |
53 | MODULE_PARM_DESC(ip_list_gid,"owning group of /proc/net/ipt_recent/* files"); | |
404bdbfd | 54 | |
404bdbfd PM |
55 | struct recent_entry { |
56 | struct list_head list; | |
57 | struct list_head lru_list; | |
6a19d614 | 58 | __be32 addr; |
404bdbfd PM |
59 | u_int8_t ttl; |
60 | u_int8_t index; | |
61 | u_int16_t nstamps; | |
62 | unsigned long stamps[0]; | |
1da177e4 LT |
63 | }; |
64 | ||
404bdbfd PM |
65 | struct recent_table { |
66 | struct list_head list; | |
67 | char name[IPT_RECENT_NAME_LEN]; | |
1da177e4 | 68 | #ifdef CONFIG_PROC_FS |
404bdbfd PM |
69 | struct proc_dir_entry *proc; |
70 | #endif | |
71 | unsigned int refcnt; | |
72 | unsigned int entries; | |
73 | struct list_head lru_list; | |
74 | struct list_head iphash[0]; | |
1da177e4 LT |
75 | }; |
76 | ||
404bdbfd | 77 | static LIST_HEAD(tables); |
1da177e4 | 78 | static DEFINE_SPINLOCK(recent_lock); |
a0e889bb | 79 | static DEFINE_MUTEX(recent_mutex); |
1da177e4 LT |
80 | |
81 | #ifdef CONFIG_PROC_FS | |
404bdbfd | 82 | static struct proc_dir_entry *proc_dir; |
9a32144e | 83 | static const struct file_operations recent_fops; |
1da177e4 LT |
84 | #endif |
85 | ||
404bdbfd PM |
86 | static u_int32_t hash_rnd; |
87 | static int hash_rnd_initted; | |
1da177e4 | 88 | |
6a19d614 | 89 | static unsigned int recent_entry_hash(__be32 addr) |
1da177e4 | 90 | { |
404bdbfd PM |
91 | if (!hash_rnd_initted) { |
92 | get_random_bytes(&hash_rnd, 4); | |
93 | hash_rnd_initted = 1; | |
1da177e4 | 94 | } |
6a19d614 | 95 | return jhash_1word((__force u32)addr, hash_rnd) & (ip_list_hash_size - 1); |
1da177e4 LT |
96 | } |
97 | ||
404bdbfd | 98 | static struct recent_entry * |
6a19d614 | 99 | recent_entry_lookup(const struct recent_table *table, __be32 addr, u_int8_t ttl) |
1da177e4 | 100 | { |
404bdbfd PM |
101 | struct recent_entry *e; |
102 | unsigned int h; | |
103 | ||
104 | h = recent_entry_hash(addr); | |
105 | list_for_each_entry(e, &table->iphash[h], list) | |
106 | if (e->addr == addr && (ttl == e->ttl || !ttl || !e->ttl)) | |
107 | return e; | |
108 | return NULL; | |
109 | } | |
1da177e4 | 110 | |
404bdbfd PM |
111 | static void recent_entry_remove(struct recent_table *t, struct recent_entry *e) |
112 | { | |
113 | list_del(&e->list); | |
114 | list_del(&e->lru_list); | |
115 | kfree(e); | |
116 | t->entries--; | |
117 | } | |
1da177e4 | 118 | |
404bdbfd | 119 | static struct recent_entry * |
6a19d614 | 120 | recent_entry_init(struct recent_table *t, __be32 addr, u_int8_t ttl) |
404bdbfd PM |
121 | { |
122 | struct recent_entry *e; | |
1da177e4 | 123 | |
404bdbfd PM |
124 | if (t->entries >= ip_list_tot) { |
125 | e = list_entry(t->lru_list.next, struct recent_entry, lru_list); | |
126 | recent_entry_remove(t, e); | |
1da177e4 | 127 | } |
404bdbfd PM |
128 | e = kmalloc(sizeof(*e) + sizeof(e->stamps[0]) * ip_pkt_list_tot, |
129 | GFP_ATOMIC); | |
130 | if (e == NULL) | |
131 | return NULL; | |
132 | e->addr = addr; | |
133 | e->ttl = ttl; | |
134 | e->stamps[0] = jiffies; | |
135 | e->nstamps = 1; | |
136 | e->index = 1; | |
137 | list_add_tail(&e->list, &t->iphash[recent_entry_hash(addr)]); | |
138 | list_add_tail(&e->lru_list, &t->lru_list); | |
139 | t->entries++; | |
140 | return e; | |
141 | } | |
1da177e4 | 142 | |
404bdbfd PM |
143 | static void recent_entry_update(struct recent_table *t, struct recent_entry *e) |
144 | { | |
145 | e->stamps[e->index++] = jiffies; | |
146 | if (e->index > e->nstamps) | |
147 | e->nstamps = e->index; | |
148 | e->index %= ip_pkt_list_tot; | |
149 | list_move_tail(&e->lru_list, &t->lru_list); | |
150 | } | |
1da177e4 | 151 | |
404bdbfd PM |
152 | static struct recent_table *recent_table_lookup(const char *name) |
153 | { | |
154 | struct recent_table *t; | |
1da177e4 | 155 | |
404bdbfd PM |
156 | list_for_each_entry(t, &tables, list) |
157 | if (!strcmp(t->name, name)) | |
158 | return t; | |
159 | return NULL; | |
160 | } | |
1da177e4 | 161 | |
404bdbfd PM |
162 | static void recent_table_flush(struct recent_table *t) |
163 | { | |
164 | struct recent_entry *e, *next; | |
165 | unsigned int i; | |
1da177e4 | 166 | |
7c4e36bc | 167 | for (i = 0; i < ip_list_hash_size; i++) |
404bdbfd PM |
168 | list_for_each_entry_safe(e, next, &t->iphash[i], list) |
169 | recent_entry_remove(t, e); | |
1da177e4 LT |
170 | } |
171 | ||
1d93a9cb | 172 | static bool |
d3c5ee6d JE |
173 | recent_mt(const struct sk_buff *skb, const struct net_device *in, |
174 | const struct net_device *out, const struct xt_match *match, | |
175 | const void *matchinfo, int offset, unsigned int protoff, | |
176 | bool *hotdrop) | |
1da177e4 | 177 | { |
1da177e4 | 178 | const struct ipt_recent_info *info = matchinfo; |
404bdbfd PM |
179 | struct recent_table *t; |
180 | struct recent_entry *e; | |
6a19d614 | 181 | __be32 addr; |
404bdbfd | 182 | u_int8_t ttl; |
1d93a9cb | 183 | bool ret = info->invert; |
1da177e4 | 184 | |
404bdbfd | 185 | if (info->side == IPT_RECENT_DEST) |
eddc9ec5 | 186 | addr = ip_hdr(skb)->daddr; |
404bdbfd | 187 | else |
eddc9ec5 | 188 | addr = ip_hdr(skb)->saddr; |
1da177e4 | 189 | |
eddc9ec5 | 190 | ttl = ip_hdr(skb)->ttl; |
404bdbfd PM |
191 | /* use TTL as seen before forwarding */ |
192 | if (out && !skb->sk) | |
193 | ttl++; | |
1da177e4 | 194 | |
1da177e4 | 195 | spin_lock_bh(&recent_lock); |
404bdbfd PM |
196 | t = recent_table_lookup(info->name); |
197 | e = recent_entry_lookup(t, addr, | |
198 | info->check_set & IPT_RECENT_TTL ? ttl : 0); | |
199 | if (e == NULL) { | |
200 | if (!(info->check_set & IPT_RECENT_SET)) | |
201 | goto out; | |
202 | e = recent_entry_init(t, addr, ttl); | |
203 | if (e == NULL) | |
cff533ac | 204 | *hotdrop = true; |
1d93a9cb | 205 | ret = !ret; |
404bdbfd | 206 | goto out; |
1da177e4 LT |
207 | } |
208 | ||
404bdbfd | 209 | if (info->check_set & IPT_RECENT_SET) |
1d93a9cb | 210 | ret = !ret; |
404bdbfd PM |
211 | else if (info->check_set & IPT_RECENT_REMOVE) { |
212 | recent_entry_remove(t, e); | |
1d93a9cb | 213 | ret = !ret; |
404bdbfd | 214 | } else if (info->check_set & (IPT_RECENT_CHECK | IPT_RECENT_UPDATE)) { |
855304af | 215 | unsigned long time = jiffies - info->seconds * HZ; |
404bdbfd PM |
216 | unsigned int i, hits = 0; |
217 | ||
218 | for (i = 0; i < e->nstamps; i++) { | |
855304af | 219 | if (info->seconds && time_after(time, e->stamps[i])) |
404bdbfd PM |
220 | continue; |
221 | if (++hits >= info->hit_count) { | |
1d93a9cb | 222 | ret = !ret; |
404bdbfd | 223 | break; |
1da177e4 | 224 | } |
1da177e4 | 225 | } |
1da177e4 LT |
226 | } |
227 | ||
404bdbfd PM |
228 | if (info->check_set & IPT_RECENT_SET || |
229 | (info->check_set & IPT_RECENT_UPDATE && ret)) { | |
230 | recent_entry_update(t, e); | |
231 | e->ttl = ttl; | |
232 | } | |
233 | out: | |
234 | spin_unlock_bh(&recent_lock); | |
235 | return ret; | |
1da177e4 LT |
236 | } |
237 | ||
ccb79bdc | 238 | static bool |
d3c5ee6d JE |
239 | recent_mt_check(const char *tablename, const void *ip, |
240 | const struct xt_match *match, void *matchinfo, | |
241 | unsigned int hook_mask) | |
1da177e4 | 242 | { |
1da177e4 | 243 | const struct ipt_recent_info *info = matchinfo; |
404bdbfd PM |
244 | struct recent_table *t; |
245 | unsigned i; | |
ccb79bdc | 246 | bool ret = false; |
1da177e4 | 247 | |
404bdbfd PM |
248 | if (hweight8(info->check_set & |
249 | (IPT_RECENT_SET | IPT_RECENT_REMOVE | | |
250 | IPT_RECENT_CHECK | IPT_RECENT_UPDATE)) != 1) | |
ccb79bdc | 251 | return false; |
404bdbfd PM |
252 | if ((info->check_set & (IPT_RECENT_SET | IPT_RECENT_REMOVE)) && |
253 | (info->seconds || info->hit_count)) | |
ccb79bdc | 254 | return false; |
d0ebf133 DHZ |
255 | if (info->hit_count > ip_pkt_list_tot) |
256 | return false; | |
404bdbfd PM |
257 | if (info->name[0] == '\0' || |
258 | strnlen(info->name, IPT_RECENT_NAME_LEN) == IPT_RECENT_NAME_LEN) | |
ccb79bdc | 259 | return false; |
1da177e4 | 260 | |
a0e889bb | 261 | mutex_lock(&recent_mutex); |
404bdbfd PM |
262 | t = recent_table_lookup(info->name); |
263 | if (t != NULL) { | |
264 | t->refcnt++; | |
ccb79bdc | 265 | ret = true; |
404bdbfd | 266 | goto out; |
1da177e4 LT |
267 | } |
268 | ||
404bdbfd | 269 | t = kzalloc(sizeof(*t) + sizeof(t->iphash[0]) * ip_list_hash_size, |
a0e889bb | 270 | GFP_KERNEL); |
404bdbfd PM |
271 | if (t == NULL) |
272 | goto out; | |
2b2283d0 | 273 | t->refcnt = 1; |
404bdbfd PM |
274 | strcpy(t->name, info->name); |
275 | INIT_LIST_HEAD(&t->lru_list); | |
276 | for (i = 0; i < ip_list_hash_size; i++) | |
277 | INIT_LIST_HEAD(&t->iphash[i]); | |
278 | #ifdef CONFIG_PROC_FS | |
8eeee8b1 | 279 | t->proc = proc_create(t->name, ip_list_perms, proc_dir, &recent_fops); |
404bdbfd PM |
280 | if (t->proc == NULL) { |
281 | kfree(t); | |
282 | goto out; | |
1da177e4 | 283 | } |
b93ff783 DDG |
284 | t->proc->uid = ip_list_uid; |
285 | t->proc->gid = ip_list_gid; | |
404bdbfd | 286 | t->proc->data = t; |
1da177e4 | 287 | #endif |
a0e889bb | 288 | spin_lock_bh(&recent_lock); |
404bdbfd | 289 | list_add_tail(&t->list, &tables); |
a0e889bb | 290 | spin_unlock_bh(&recent_lock); |
ccb79bdc | 291 | ret = true; |
404bdbfd | 292 | out: |
a0e889bb | 293 | mutex_unlock(&recent_mutex); |
404bdbfd PM |
294 | return ret; |
295 | } | |
1da177e4 | 296 | |
d3c5ee6d | 297 | static void recent_mt_destroy(const struct xt_match *match, void *matchinfo) |
404bdbfd PM |
298 | { |
299 | const struct ipt_recent_info *info = matchinfo; | |
300 | struct recent_table *t; | |
1da177e4 | 301 | |
a0e889bb | 302 | mutex_lock(&recent_mutex); |
404bdbfd PM |
303 | t = recent_table_lookup(info->name); |
304 | if (--t->refcnt == 0) { | |
a0e889bb | 305 | spin_lock_bh(&recent_lock); |
404bdbfd | 306 | list_del(&t->list); |
a0e889bb | 307 | spin_unlock_bh(&recent_lock); |
404bdbfd PM |
308 | #ifdef CONFIG_PROC_FS |
309 | remove_proc_entry(t->name, proc_dir); | |
1da177e4 | 310 | #endif |
a8ddc916 | 311 | recent_table_flush(t); |
404bdbfd | 312 | kfree(t); |
1da177e4 | 313 | } |
a0e889bb | 314 | mutex_unlock(&recent_mutex); |
404bdbfd | 315 | } |
1da177e4 | 316 | |
404bdbfd PM |
317 | #ifdef CONFIG_PROC_FS |
318 | struct recent_iter_state { | |
319 | struct recent_table *table; | |
320 | unsigned int bucket; | |
321 | }; | |
1da177e4 | 322 | |
404bdbfd | 323 | static void *recent_seq_start(struct seq_file *seq, loff_t *pos) |
855304af | 324 | __acquires(recent_lock) |
404bdbfd PM |
325 | { |
326 | struct recent_iter_state *st = seq->private; | |
a47362a2 | 327 | const struct recent_table *t = st->table; |
404bdbfd PM |
328 | struct recent_entry *e; |
329 | loff_t p = *pos; | |
1da177e4 | 330 | |
1da177e4 | 331 | spin_lock_bh(&recent_lock); |
1da177e4 | 332 | |
7c4e36bc JE |
333 | for (st->bucket = 0; st->bucket < ip_list_hash_size; st->bucket++) |
334 | list_for_each_entry(e, &t->iphash[st->bucket], list) | |
404bdbfd PM |
335 | if (p-- == 0) |
336 | return e; | |
404bdbfd PM |
337 | return NULL; |
338 | } | |
1da177e4 | 339 | |
404bdbfd PM |
340 | static void *recent_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
341 | { | |
342 | struct recent_iter_state *st = seq->private; | |
3cf93c96 | 343 | const struct recent_table *t = st->table; |
404bdbfd PM |
344 | struct recent_entry *e = v; |
345 | struct list_head *head = e->list.next; | |
346 | ||
347 | while (head == &t->iphash[st->bucket]) { | |
348 | if (++st->bucket >= ip_list_hash_size) | |
349 | return NULL; | |
350 | head = t->iphash[st->bucket].next; | |
351 | } | |
352 | (*pos)++; | |
353 | return list_entry(head, struct recent_entry, list); | |
1da177e4 LT |
354 | } |
355 | ||
404bdbfd | 356 | static void recent_seq_stop(struct seq_file *s, void *v) |
855304af | 357 | __releases(recent_lock) |
1da177e4 | 358 | { |
404bdbfd PM |
359 | spin_unlock_bh(&recent_lock); |
360 | } | |
1da177e4 | 361 | |
404bdbfd PM |
362 | static int recent_seq_show(struct seq_file *seq, void *v) |
363 | { | |
3cf93c96 | 364 | const struct recent_entry *e = v; |
404bdbfd PM |
365 | unsigned int i; |
366 | ||
367 | i = (e->index - 1) % ip_pkt_list_tot; | |
368 | seq_printf(seq, "src=%u.%u.%u.%u ttl: %u last_seen: %lu oldest_pkt: %u", | |
369 | NIPQUAD(e->addr), e->ttl, e->stamps[i], e->index); | |
370 | for (i = 0; i < e->nstamps; i++) | |
371 | seq_printf(seq, "%s %lu", i ? "," : "", e->stamps[i]); | |
372 | seq_printf(seq, "\n"); | |
373 | return 0; | |
374 | } | |
1da177e4 | 375 | |
56b3d975 | 376 | static const struct seq_operations recent_seq_ops = { |
404bdbfd PM |
377 | .start = recent_seq_start, |
378 | .next = recent_seq_next, | |
379 | .stop = recent_seq_stop, | |
380 | .show = recent_seq_show, | |
381 | }; | |
1da177e4 | 382 | |
404bdbfd PM |
383 | static int recent_seq_open(struct inode *inode, struct file *file) |
384 | { | |
385 | struct proc_dir_entry *pde = PDE(inode); | |
404bdbfd | 386 | struct recent_iter_state *st; |
404bdbfd | 387 | |
e2da5913 | 388 | st = __seq_open_private(file, &recent_seq_ops, sizeof(*st)); |
404bdbfd PM |
389 | if (st == NULL) |
390 | return -ENOMEM; | |
3af8e31c | 391 | |
404bdbfd | 392 | st->table = pde->data; |
e2da5913 | 393 | return 0; |
404bdbfd | 394 | } |
1da177e4 | 395 | |
404bdbfd PM |
396 | static ssize_t recent_proc_write(struct file *file, const char __user *input, |
397 | size_t size, loff_t *loff) | |
398 | { | |
3cf93c96 | 399 | const struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode); |
404bdbfd PM |
400 | struct recent_table *t = pde->data; |
401 | struct recent_entry *e; | |
402 | char buf[sizeof("+255.255.255.255")], *c = buf; | |
6a19d614 | 403 | __be32 addr; |
404bdbfd PM |
404 | int add; |
405 | ||
406 | if (size > sizeof(buf)) | |
407 | size = sizeof(buf); | |
408 | if (copy_from_user(buf, input, size)) | |
409 | return -EFAULT; | |
410 | while (isspace(*c)) | |
411 | c++; | |
412 | ||
413 | if (size - (c - buf) < 5) | |
414 | return c - buf; | |
415 | if (!strncmp(c, "clear", 5)) { | |
416 | c += 5; | |
417 | spin_lock_bh(&recent_lock); | |
418 | recent_table_flush(t); | |
1da177e4 | 419 | spin_unlock_bh(&recent_lock); |
404bdbfd | 420 | return c - buf; |
1da177e4 | 421 | } |
1da177e4 | 422 | |
404bdbfd PM |
423 | switch (*c) { |
424 | case '-': | |
425 | add = 0; | |
426 | c++; | |
427 | break; | |
428 | case '+': | |
429 | c++; | |
430 | default: | |
431 | add = 1; | |
432 | break; | |
1da177e4 | 433 | } |
404bdbfd | 434 | addr = in_aton(c); |
1da177e4 | 435 | |
404bdbfd PM |
436 | spin_lock_bh(&recent_lock); |
437 | e = recent_entry_lookup(t, addr, 0); | |
438 | if (e == NULL) { | |
439 | if (add) | |
440 | recent_entry_init(t, addr, 0); | |
441 | } else { | |
442 | if (add) | |
443 | recent_entry_update(t, e); | |
444 | else | |
445 | recent_entry_remove(t, e); | |
1da177e4 | 446 | } |
1da177e4 | 447 | spin_unlock_bh(&recent_lock); |
404bdbfd PM |
448 | return size; |
449 | } | |
1da177e4 | 450 | |
9a32144e | 451 | static const struct file_operations recent_fops = { |
404bdbfd PM |
452 | .open = recent_seq_open, |
453 | .read = seq_read, | |
454 | .write = recent_proc_write, | |
455 | .release = seq_release_private, | |
456 | .owner = THIS_MODULE, | |
457 | }; | |
1da177e4 | 458 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 459 | |
d3c5ee6d | 460 | static struct xt_match recent_mt_reg __read_mostly = { |
1d5cd909 | 461 | .name = "recent", |
6709dbbb | 462 | .family = AF_INET, |
d3c5ee6d | 463 | .match = recent_mt, |
1d5cd909 | 464 | .matchsize = sizeof(struct ipt_recent_info), |
d3c5ee6d JE |
465 | .checkentry = recent_mt_check, |
466 | .destroy = recent_mt_destroy, | |
404bdbfd | 467 | .me = THIS_MODULE, |
1da177e4 LT |
468 | }; |
469 | ||
d3c5ee6d | 470 | static int __init recent_mt_init(void) |
1da177e4 | 471 | { |
404bdbfd | 472 | int err; |
1da177e4 | 473 | |
404bdbfd PM |
474 | if (!ip_list_tot || !ip_pkt_list_tot || ip_pkt_list_tot > 255) |
475 | return -EINVAL; | |
476 | ip_list_hash_size = 1 << fls(ip_list_tot); | |
1da177e4 | 477 | |
d3c5ee6d | 478 | err = xt_register_match(&recent_mt_reg); |
404bdbfd | 479 | #ifdef CONFIG_PROC_FS |
1da177e4 | 480 | if (err) |
404bdbfd | 481 | return err; |
457c4cbc | 482 | proc_dir = proc_mkdir("ipt_recent", init_net.proc_net); |
404bdbfd | 483 | if (proc_dir == NULL) { |
d3c5ee6d | 484 | xt_unregister_match(&recent_mt_reg); |
404bdbfd PM |
485 | err = -ENOMEM; |
486 | } | |
487 | #endif | |
1da177e4 LT |
488 | return err; |
489 | } | |
490 | ||
d3c5ee6d | 491 | static void __exit recent_mt_exit(void) |
1da177e4 | 492 | { |
404bdbfd | 493 | BUG_ON(!list_empty(&tables)); |
d3c5ee6d | 494 | xt_unregister_match(&recent_mt_reg); |
404bdbfd | 495 | #ifdef CONFIG_PROC_FS |
457c4cbc | 496 | remove_proc_entry("ipt_recent", init_net.proc_net); |
404bdbfd | 497 | #endif |
1da177e4 LT |
498 | } |
499 | ||
d3c5ee6d JE |
500 | module_init(recent_mt_init); |
501 | module_exit(recent_mt_exit); |