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404bdbfd PM |
1 | /* |
2 | * Copyright (c) 2006 Patrick McHardy <kaber@trash.net> | |
079aa88f | 3 | * Copyright © CC Computer Consultants GmbH, 2007 - 2008 |
404bdbfd PM |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This is a replacement of the old ipt_recent module, which carried the | |
10 | * following copyright notice: | |
11 | * | |
12 | * Author: Stephen Frost <sfrost@snowman.net> | |
13 | * Copyright 2002-2003, Stephen Frost, 2.5.x port by laforge@netfilter.org | |
14 | */ | |
15 | #include <linux/init.h> | |
6709dbbb | 16 | #include <linux/ip.h> |
079aa88f JE |
17 | #include <linux/ipv6.h> |
18 | #include <linux/module.h> | |
404bdbfd | 19 | #include <linux/moduleparam.h> |
1da177e4 | 20 | #include <linux/proc_fs.h> |
404bdbfd PM |
21 | #include <linux/seq_file.h> |
22 | #include <linux/string.h> | |
1da177e4 | 23 | #include <linux/ctype.h> |
404bdbfd PM |
24 | #include <linux/list.h> |
25 | #include <linux/random.h> | |
26 | #include <linux/jhash.h> | |
27 | #include <linux/bitops.h> | |
28 | #include <linux/skbuff.h> | |
29 | #include <linux/inet.h> | |
457c4cbc | 30 | #include <net/net_namespace.h> |
1da177e4 | 31 | |
6709dbbb | 32 | #include <linux/netfilter/x_tables.h> |
e948b20a | 33 | #include <linux/netfilter/xt_recent.h> |
1da177e4 | 34 | |
404bdbfd | 35 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
079aa88f | 36 | MODULE_AUTHOR("Jan Engelhardt <jengelh@computergmbh.de>"); |
2ae15b64 | 37 | MODULE_DESCRIPTION("Xtables: \"recently-seen\" host matching for IPv4"); |
404bdbfd | 38 | MODULE_LICENSE("GPL"); |
e948b20a | 39 | MODULE_ALIAS("ipt_recent"); |
079aa88f | 40 | MODULE_ALIAS("ip6t_recent"); |
1da177e4 | 41 | |
e7be6994 PM |
42 | static unsigned int ip_list_tot = 100; |
43 | static unsigned int ip_pkt_list_tot = 20; | |
44 | static unsigned int ip_list_hash_size = 0; | |
45 | static unsigned int ip_list_perms = 0644; | |
b93ff783 DDG |
46 | static unsigned int ip_list_uid = 0; |
47 | static unsigned int ip_list_gid = 0; | |
e7be6994 PM |
48 | module_param(ip_list_tot, uint, 0400); |
49 | module_param(ip_pkt_list_tot, uint, 0400); | |
50 | module_param(ip_list_hash_size, uint, 0400); | |
51 | module_param(ip_list_perms, uint, 0400); | |
b93ff783 DDG |
52 | module_param(ip_list_uid, uint, 0400); |
53 | module_param(ip_list_gid, uint, 0400); | |
404bdbfd PM |
54 | MODULE_PARM_DESC(ip_list_tot, "number of IPs to remember per list"); |
55 | MODULE_PARM_DESC(ip_pkt_list_tot, "number of packets per IP to remember (max. 255)"); | |
56 | MODULE_PARM_DESC(ip_list_hash_size, "size of hash table used to look up IPs"); | |
079aa88f JE |
57 | MODULE_PARM_DESC(ip_list_perms, "permissions on /proc/net/xt_recent/* files"); |
58 | MODULE_PARM_DESC(ip_list_uid,"owner of /proc/net/xt_recent/* files"); | |
59 | MODULE_PARM_DESC(ip_list_gid,"owning group of /proc/net/xt_recent/* files"); | |
404bdbfd | 60 | |
404bdbfd PM |
61 | struct recent_entry { |
62 | struct list_head list; | |
63 | struct list_head lru_list; | |
079aa88f JE |
64 | union nf_inet_addr addr; |
65 | u_int16_t family; | |
404bdbfd PM |
66 | u_int8_t ttl; |
67 | u_int8_t index; | |
68 | u_int16_t nstamps; | |
69 | unsigned long stamps[0]; | |
1da177e4 LT |
70 | }; |
71 | ||
404bdbfd PM |
72 | struct recent_table { |
73 | struct list_head list; | |
e948b20a | 74 | char name[XT_RECENT_NAME_LEN]; |
1da177e4 | 75 | #ifdef CONFIG_PROC_FS |
079aa88f | 76 | struct proc_dir_entry *proc_old, *proc; |
404bdbfd PM |
77 | #endif |
78 | unsigned int refcnt; | |
79 | unsigned int entries; | |
80 | struct list_head lru_list; | |
81 | struct list_head iphash[0]; | |
1da177e4 LT |
82 | }; |
83 | ||
404bdbfd | 84 | static LIST_HEAD(tables); |
1da177e4 | 85 | static DEFINE_SPINLOCK(recent_lock); |
a0e889bb | 86 | static DEFINE_MUTEX(recent_mutex); |
1da177e4 LT |
87 | |
88 | #ifdef CONFIG_PROC_FS | |
079aa88f JE |
89 | #ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT |
90 | static struct proc_dir_entry *proc_old_dir; | |
91 | #endif | |
92 | static struct proc_dir_entry *recent_proc_dir; | |
93 | static const struct file_operations recent_old_fops, recent_mt_fops; | |
1da177e4 LT |
94 | #endif |
95 | ||
404bdbfd | 96 | static u_int32_t hash_rnd; |
079aa88f JE |
97 | static bool hash_rnd_initted; |
98 | ||
99 | static unsigned int recent_entry_hash4(const union nf_inet_addr *addr) | |
100 | { | |
101 | if (!hash_rnd_initted) { | |
102 | get_random_bytes(&hash_rnd, sizeof(hash_rnd)); | |
103 | hash_rnd_initted = true; | |
104 | } | |
105 | return jhash_1word((__force u32)addr->ip, hash_rnd) & | |
106 | (ip_list_hash_size - 1); | |
107 | } | |
1da177e4 | 108 | |
079aa88f | 109 | static unsigned int recent_entry_hash6(const union nf_inet_addr *addr) |
1da177e4 | 110 | { |
404bdbfd | 111 | if (!hash_rnd_initted) { |
079aa88f JE |
112 | get_random_bytes(&hash_rnd, sizeof(hash_rnd)); |
113 | hash_rnd_initted = true; | |
1da177e4 | 114 | } |
079aa88f JE |
115 | return jhash2((u32 *)addr->ip6, ARRAY_SIZE(addr->ip6), hash_rnd) & |
116 | (ip_list_hash_size - 1); | |
1da177e4 LT |
117 | } |
118 | ||
404bdbfd | 119 | static struct recent_entry * |
079aa88f JE |
120 | recent_entry_lookup(const struct recent_table *table, |
121 | const union nf_inet_addr *addrp, u_int16_t family, | |
122 | u_int8_t ttl) | |
1da177e4 | 123 | { |
404bdbfd PM |
124 | struct recent_entry *e; |
125 | unsigned int h; | |
126 | ||
ee999d8b | 127 | if (family == NFPROTO_IPV4) |
079aa88f JE |
128 | h = recent_entry_hash4(addrp); |
129 | else | |
130 | h = recent_entry_hash6(addrp); | |
131 | ||
404bdbfd | 132 | list_for_each_entry(e, &table->iphash[h], list) |
079aa88f JE |
133 | if (e->family == family && |
134 | memcmp(&e->addr, addrp, sizeof(e->addr)) == 0 && | |
135 | (ttl == e->ttl || ttl == 0 || e->ttl == 0)) | |
404bdbfd PM |
136 | return e; |
137 | return NULL; | |
138 | } | |
1da177e4 | 139 | |
404bdbfd PM |
140 | static void recent_entry_remove(struct recent_table *t, struct recent_entry *e) |
141 | { | |
142 | list_del(&e->list); | |
143 | list_del(&e->lru_list); | |
144 | kfree(e); | |
145 | t->entries--; | |
146 | } | |
1da177e4 | 147 | |
404bdbfd | 148 | static struct recent_entry * |
079aa88f JE |
149 | recent_entry_init(struct recent_table *t, const union nf_inet_addr *addr, |
150 | u_int16_t family, u_int8_t ttl) | |
404bdbfd PM |
151 | { |
152 | struct recent_entry *e; | |
1da177e4 | 153 | |
404bdbfd PM |
154 | if (t->entries >= ip_list_tot) { |
155 | e = list_entry(t->lru_list.next, struct recent_entry, lru_list); | |
156 | recent_entry_remove(t, e); | |
1da177e4 | 157 | } |
404bdbfd PM |
158 | e = kmalloc(sizeof(*e) + sizeof(e->stamps[0]) * ip_pkt_list_tot, |
159 | GFP_ATOMIC); | |
160 | if (e == NULL) | |
161 | return NULL; | |
079aa88f | 162 | memcpy(&e->addr, addr, sizeof(e->addr)); |
404bdbfd PM |
163 | e->ttl = ttl; |
164 | e->stamps[0] = jiffies; | |
165 | e->nstamps = 1; | |
166 | e->index = 1; | |
079aa88f | 167 | e->family = family; |
ee999d8b | 168 | if (family == NFPROTO_IPV4) |
079aa88f JE |
169 | list_add_tail(&e->list, &t->iphash[recent_entry_hash4(addr)]); |
170 | else | |
171 | list_add_tail(&e->list, &t->iphash[recent_entry_hash6(addr)]); | |
404bdbfd PM |
172 | list_add_tail(&e->lru_list, &t->lru_list); |
173 | t->entries++; | |
174 | return e; | |
175 | } | |
1da177e4 | 176 | |
404bdbfd PM |
177 | static void recent_entry_update(struct recent_table *t, struct recent_entry *e) |
178 | { | |
179 | e->stamps[e->index++] = jiffies; | |
180 | if (e->index > e->nstamps) | |
181 | e->nstamps = e->index; | |
182 | e->index %= ip_pkt_list_tot; | |
183 | list_move_tail(&e->lru_list, &t->lru_list); | |
184 | } | |
1da177e4 | 185 | |
404bdbfd PM |
186 | static struct recent_table *recent_table_lookup(const char *name) |
187 | { | |
188 | struct recent_table *t; | |
1da177e4 | 189 | |
404bdbfd PM |
190 | list_for_each_entry(t, &tables, list) |
191 | if (!strcmp(t->name, name)) | |
192 | return t; | |
193 | return NULL; | |
194 | } | |
1da177e4 | 195 | |
404bdbfd PM |
196 | static void recent_table_flush(struct recent_table *t) |
197 | { | |
198 | struct recent_entry *e, *next; | |
199 | unsigned int i; | |
1da177e4 | 200 | |
7c4e36bc | 201 | for (i = 0; i < ip_list_hash_size; i++) |
404bdbfd PM |
202 | list_for_each_entry_safe(e, next, &t->iphash[i], list) |
203 | recent_entry_remove(t, e); | |
1da177e4 LT |
204 | } |
205 | ||
1d93a9cb | 206 | static bool |
f7108a20 | 207 | recent_mt(const struct sk_buff *skb, const struct xt_match_param *par) |
1da177e4 | 208 | { |
f7108a20 | 209 | const struct xt_recent_mtinfo *info = par->matchinfo; |
404bdbfd PM |
210 | struct recent_table *t; |
211 | struct recent_entry *e; | |
079aa88f | 212 | union nf_inet_addr addr = {}; |
404bdbfd | 213 | u_int8_t ttl; |
1d93a9cb | 214 | bool ret = info->invert; |
1da177e4 | 215 | |
f7108a20 | 216 | if (par->match->family == NFPROTO_IPV4) { |
079aa88f JE |
217 | const struct iphdr *iph = ip_hdr(skb); |
218 | ||
219 | if (info->side == XT_RECENT_DEST) | |
220 | addr.ip = iph->daddr; | |
221 | else | |
222 | addr.ip = iph->saddr; | |
223 | ||
224 | ttl = iph->ttl; | |
225 | } else { | |
226 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
227 | ||
228 | if (info->side == XT_RECENT_DEST) | |
229 | memcpy(&addr.in6, &iph->daddr, sizeof(addr.in6)); | |
230 | else | |
231 | memcpy(&addr.in6, &iph->saddr, sizeof(addr.in6)); | |
232 | ||
233 | ttl = iph->hop_limit; | |
234 | } | |
1da177e4 | 235 | |
404bdbfd | 236 | /* use TTL as seen before forwarding */ |
f7108a20 | 237 | if (par->out != NULL && skb->sk == NULL) |
404bdbfd | 238 | ttl++; |
1da177e4 | 239 | |
1da177e4 | 240 | spin_lock_bh(&recent_lock); |
404bdbfd | 241 | t = recent_table_lookup(info->name); |
f7108a20 | 242 | e = recent_entry_lookup(t, &addr, par->match->family, |
079aa88f | 243 | (info->check_set & XT_RECENT_TTL) ? ttl : 0); |
404bdbfd | 244 | if (e == NULL) { |
e948b20a | 245 | if (!(info->check_set & XT_RECENT_SET)) |
404bdbfd | 246 | goto out; |
f7108a20 | 247 | e = recent_entry_init(t, &addr, par->match->family, ttl); |
404bdbfd | 248 | if (e == NULL) |
f7108a20 | 249 | *par->hotdrop = true; |
1d93a9cb | 250 | ret = !ret; |
404bdbfd | 251 | goto out; |
1da177e4 LT |
252 | } |
253 | ||
e948b20a | 254 | if (info->check_set & XT_RECENT_SET) |
1d93a9cb | 255 | ret = !ret; |
e948b20a | 256 | else if (info->check_set & XT_RECENT_REMOVE) { |
404bdbfd | 257 | recent_entry_remove(t, e); |
1d93a9cb | 258 | ret = !ret; |
e948b20a | 259 | } else if (info->check_set & (XT_RECENT_CHECK | XT_RECENT_UPDATE)) { |
855304af | 260 | unsigned long time = jiffies - info->seconds * HZ; |
404bdbfd PM |
261 | unsigned int i, hits = 0; |
262 | ||
263 | for (i = 0; i < e->nstamps; i++) { | |
855304af | 264 | if (info->seconds && time_after(time, e->stamps[i])) |
404bdbfd PM |
265 | continue; |
266 | if (++hits >= info->hit_count) { | |
1d93a9cb | 267 | ret = !ret; |
404bdbfd | 268 | break; |
1da177e4 | 269 | } |
1da177e4 | 270 | } |
1da177e4 LT |
271 | } |
272 | ||
e948b20a JE |
273 | if (info->check_set & XT_RECENT_SET || |
274 | (info->check_set & XT_RECENT_UPDATE && ret)) { | |
404bdbfd PM |
275 | recent_entry_update(t, e); |
276 | e->ttl = ttl; | |
277 | } | |
278 | out: | |
279 | spin_unlock_bh(&recent_lock); | |
280 | return ret; | |
1da177e4 LT |
281 | } |
282 | ||
9b4fce7a | 283 | static bool recent_mt_check(const struct xt_mtchk_param *par) |
1da177e4 | 284 | { |
9b4fce7a | 285 | const struct xt_recent_mtinfo *info = par->matchinfo; |
404bdbfd PM |
286 | struct recent_table *t; |
287 | unsigned i; | |
ccb79bdc | 288 | bool ret = false; |
1da177e4 | 289 | |
404bdbfd | 290 | if (hweight8(info->check_set & |
e948b20a JE |
291 | (XT_RECENT_SET | XT_RECENT_REMOVE | |
292 | XT_RECENT_CHECK | XT_RECENT_UPDATE)) != 1) | |
ccb79bdc | 293 | return false; |
e948b20a | 294 | if ((info->check_set & (XT_RECENT_SET | XT_RECENT_REMOVE)) && |
404bdbfd | 295 | (info->seconds || info->hit_count)) |
ccb79bdc | 296 | return false; |
d0ebf133 DHZ |
297 | if (info->hit_count > ip_pkt_list_tot) |
298 | return false; | |
404bdbfd | 299 | if (info->name[0] == '\0' || |
e948b20a | 300 | strnlen(info->name, XT_RECENT_NAME_LEN) == XT_RECENT_NAME_LEN) |
ccb79bdc | 301 | return false; |
1da177e4 | 302 | |
a0e889bb | 303 | mutex_lock(&recent_mutex); |
404bdbfd PM |
304 | t = recent_table_lookup(info->name); |
305 | if (t != NULL) { | |
306 | t->refcnt++; | |
ccb79bdc | 307 | ret = true; |
404bdbfd | 308 | goto out; |
1da177e4 LT |
309 | } |
310 | ||
404bdbfd | 311 | t = kzalloc(sizeof(*t) + sizeof(t->iphash[0]) * ip_list_hash_size, |
a0e889bb | 312 | GFP_KERNEL); |
404bdbfd PM |
313 | if (t == NULL) |
314 | goto out; | |
2b2283d0 | 315 | t->refcnt = 1; |
404bdbfd PM |
316 | strcpy(t->name, info->name); |
317 | INIT_LIST_HEAD(&t->lru_list); | |
318 | for (i = 0; i < ip_list_hash_size; i++) | |
319 | INIT_LIST_HEAD(&t->iphash[i]); | |
320 | #ifdef CONFIG_PROC_FS | |
b09eec16 AD |
321 | t->proc = proc_create_data(t->name, ip_list_perms, recent_proc_dir, |
322 | &recent_mt_fops, t); | |
404bdbfd PM |
323 | if (t->proc == NULL) { |
324 | kfree(t); | |
325 | goto out; | |
1da177e4 | 326 | } |
079aa88f | 327 | #ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT |
b09eec16 AD |
328 | t->proc_old = proc_create_data(t->name, ip_list_perms, proc_old_dir, |
329 | &recent_old_fops, t); | |
079aa88f JE |
330 | if (t->proc_old == NULL) { |
331 | remove_proc_entry(t->name, proc_old_dir); | |
332 | kfree(t); | |
333 | goto out; | |
334 | } | |
335 | t->proc_old->uid = ip_list_uid; | |
336 | t->proc_old->gid = ip_list_gid; | |
079aa88f | 337 | #endif |
b93ff783 DDG |
338 | t->proc->uid = ip_list_uid; |
339 | t->proc->gid = ip_list_gid; | |
1da177e4 | 340 | #endif |
a0e889bb | 341 | spin_lock_bh(&recent_lock); |
404bdbfd | 342 | list_add_tail(&t->list, &tables); |
a0e889bb | 343 | spin_unlock_bh(&recent_lock); |
ccb79bdc | 344 | ret = true; |
404bdbfd | 345 | out: |
a0e889bb | 346 | mutex_unlock(&recent_mutex); |
404bdbfd PM |
347 | return ret; |
348 | } | |
1da177e4 | 349 | |
6be3d859 | 350 | static void recent_mt_destroy(const struct xt_mtdtor_param *par) |
404bdbfd | 351 | { |
6be3d859 | 352 | const struct xt_recent_mtinfo *info = par->matchinfo; |
404bdbfd | 353 | struct recent_table *t; |
1da177e4 | 354 | |
a0e889bb | 355 | mutex_lock(&recent_mutex); |
404bdbfd PM |
356 | t = recent_table_lookup(info->name); |
357 | if (--t->refcnt == 0) { | |
a0e889bb | 358 | spin_lock_bh(&recent_lock); |
404bdbfd | 359 | list_del(&t->list); |
a0e889bb | 360 | spin_unlock_bh(&recent_lock); |
404bdbfd | 361 | #ifdef CONFIG_PROC_FS |
079aa88f JE |
362 | #ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT |
363 | remove_proc_entry(t->name, proc_old_dir); | |
364 | #endif | |
365 | remove_proc_entry(t->name, recent_proc_dir); | |
1da177e4 | 366 | #endif |
a8ddc916 | 367 | recent_table_flush(t); |
404bdbfd | 368 | kfree(t); |
1da177e4 | 369 | } |
a0e889bb | 370 | mutex_unlock(&recent_mutex); |
404bdbfd | 371 | } |
1da177e4 | 372 | |
404bdbfd PM |
373 | #ifdef CONFIG_PROC_FS |
374 | struct recent_iter_state { | |
079aa88f | 375 | const struct recent_table *table; |
404bdbfd PM |
376 | unsigned int bucket; |
377 | }; | |
1da177e4 | 378 | |
404bdbfd | 379 | static void *recent_seq_start(struct seq_file *seq, loff_t *pos) |
855304af | 380 | __acquires(recent_lock) |
404bdbfd PM |
381 | { |
382 | struct recent_iter_state *st = seq->private; | |
a47362a2 | 383 | const struct recent_table *t = st->table; |
404bdbfd PM |
384 | struct recent_entry *e; |
385 | loff_t p = *pos; | |
1da177e4 | 386 | |
1da177e4 | 387 | spin_lock_bh(&recent_lock); |
1da177e4 | 388 | |
7c4e36bc JE |
389 | for (st->bucket = 0; st->bucket < ip_list_hash_size; st->bucket++) |
390 | list_for_each_entry(e, &t->iphash[st->bucket], list) | |
404bdbfd PM |
391 | if (p-- == 0) |
392 | return e; | |
404bdbfd PM |
393 | return NULL; |
394 | } | |
1da177e4 | 395 | |
404bdbfd PM |
396 | static void *recent_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
397 | { | |
398 | struct recent_iter_state *st = seq->private; | |
3cf93c96 | 399 | const struct recent_table *t = st->table; |
079aa88f JE |
400 | const struct recent_entry *e = v; |
401 | const struct list_head *head = e->list.next; | |
404bdbfd PM |
402 | |
403 | while (head == &t->iphash[st->bucket]) { | |
404 | if (++st->bucket >= ip_list_hash_size) | |
405 | return NULL; | |
406 | head = t->iphash[st->bucket].next; | |
407 | } | |
408 | (*pos)++; | |
409 | return list_entry(head, struct recent_entry, list); | |
1da177e4 LT |
410 | } |
411 | ||
404bdbfd | 412 | static void recent_seq_stop(struct seq_file *s, void *v) |
855304af | 413 | __releases(recent_lock) |
1da177e4 | 414 | { |
404bdbfd PM |
415 | spin_unlock_bh(&recent_lock); |
416 | } | |
1da177e4 | 417 | |
404bdbfd PM |
418 | static int recent_seq_show(struct seq_file *seq, void *v) |
419 | { | |
3cf93c96 | 420 | const struct recent_entry *e = v; |
404bdbfd PM |
421 | unsigned int i; |
422 | ||
423 | i = (e->index - 1) % ip_pkt_list_tot; | |
ee999d8b | 424 | if (e->family == NFPROTO_IPV4) |
079aa88f JE |
425 | seq_printf(seq, "src=" NIPQUAD_FMT " ttl: %u last_seen: %lu " |
426 | "oldest_pkt: %u", NIPQUAD(e->addr.ip), e->ttl, | |
427 | e->stamps[i], e->index); | |
428 | else | |
38ff4fa4 HH |
429 | seq_printf(seq, "src=%p6 ttl: %u last_seen: %lu oldest_pkt: %u", |
430 | &e->addr.in6, e->ttl, e->stamps[i], e->index); | |
404bdbfd PM |
431 | for (i = 0; i < e->nstamps; i++) |
432 | seq_printf(seq, "%s %lu", i ? "," : "", e->stamps[i]); | |
433 | seq_printf(seq, "\n"); | |
434 | return 0; | |
435 | } | |
1da177e4 | 436 | |
56b3d975 | 437 | static const struct seq_operations recent_seq_ops = { |
404bdbfd PM |
438 | .start = recent_seq_start, |
439 | .next = recent_seq_next, | |
440 | .stop = recent_seq_stop, | |
441 | .show = recent_seq_show, | |
442 | }; | |
1da177e4 | 443 | |
404bdbfd PM |
444 | static int recent_seq_open(struct inode *inode, struct file *file) |
445 | { | |
446 | struct proc_dir_entry *pde = PDE(inode); | |
404bdbfd | 447 | struct recent_iter_state *st; |
404bdbfd | 448 | |
e2da5913 | 449 | st = __seq_open_private(file, &recent_seq_ops, sizeof(*st)); |
404bdbfd PM |
450 | if (st == NULL) |
451 | return -ENOMEM; | |
3af8e31c | 452 | |
404bdbfd | 453 | st->table = pde->data; |
e2da5913 | 454 | return 0; |
404bdbfd | 455 | } |
1da177e4 | 456 | |
079aa88f JE |
457 | #ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT |
458 | static int recent_old_seq_open(struct inode *inode, struct file *filp) | |
459 | { | |
460 | static bool warned_of_old; | |
461 | ||
462 | if (unlikely(!warned_of_old)) { | |
463 | printk(KERN_INFO KBUILD_MODNAME ": Use of /proc/net/ipt_recent" | |
464 | " is deprecated; use /proc/net/xt_recent.\n"); | |
465 | warned_of_old = true; | |
466 | } | |
467 | return recent_seq_open(inode, filp); | |
468 | } | |
469 | ||
470 | static ssize_t recent_old_proc_write(struct file *file, | |
471 | const char __user *input, | |
472 | size_t size, loff_t *loff) | |
404bdbfd | 473 | { |
3cf93c96 | 474 | const struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode); |
404bdbfd PM |
475 | struct recent_table *t = pde->data; |
476 | struct recent_entry *e; | |
477 | char buf[sizeof("+255.255.255.255")], *c = buf; | |
6a19d614 | 478 | __be32 addr; |
404bdbfd PM |
479 | int add; |
480 | ||
481 | if (size > sizeof(buf)) | |
482 | size = sizeof(buf); | |
483 | if (copy_from_user(buf, input, size)) | |
484 | return -EFAULT; | |
079aa88f | 485 | |
404bdbfd PM |
486 | while (isspace(*c)) |
487 | c++; | |
488 | ||
489 | if (size - (c - buf) < 5) | |
490 | return c - buf; | |
491 | if (!strncmp(c, "clear", 5)) { | |
492 | c += 5; | |
493 | spin_lock_bh(&recent_lock); | |
494 | recent_table_flush(t); | |
1da177e4 | 495 | spin_unlock_bh(&recent_lock); |
404bdbfd | 496 | return c - buf; |
1da177e4 | 497 | } |
1da177e4 | 498 | |
404bdbfd PM |
499 | switch (*c) { |
500 | case '-': | |
501 | add = 0; | |
502 | c++; | |
503 | break; | |
504 | case '+': | |
505 | c++; | |
506 | default: | |
507 | add = 1; | |
508 | break; | |
1da177e4 | 509 | } |
404bdbfd | 510 | addr = in_aton(c); |
1da177e4 | 511 | |
404bdbfd | 512 | spin_lock_bh(&recent_lock); |
ee999d8b | 513 | e = recent_entry_lookup(t, (const void *)&addr, NFPROTO_IPV4, 0); |
404bdbfd PM |
514 | if (e == NULL) { |
515 | if (add) | |
ee999d8b JE |
516 | recent_entry_init(t, (const void *)&addr, |
517 | NFPROTO_IPV4, 0); | |
404bdbfd PM |
518 | } else { |
519 | if (add) | |
520 | recent_entry_update(t, e); | |
521 | else | |
522 | recent_entry_remove(t, e); | |
1da177e4 | 523 | } |
1da177e4 | 524 | spin_unlock_bh(&recent_lock); |
404bdbfd PM |
525 | return size; |
526 | } | |
1da177e4 | 527 | |
079aa88f JE |
528 | static const struct file_operations recent_old_fops = { |
529 | .open = recent_old_seq_open, | |
404bdbfd | 530 | .read = seq_read, |
079aa88f | 531 | .write = recent_old_proc_write, |
404bdbfd PM |
532 | .release = seq_release_private, |
533 | .owner = THIS_MODULE, | |
534 | }; | |
079aa88f JE |
535 | #endif |
536 | ||
537 | static ssize_t | |
538 | recent_mt_proc_write(struct file *file, const char __user *input, | |
539 | size_t size, loff_t *loff) | |
540 | { | |
541 | const struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode); | |
542 | struct recent_table *t = pde->data; | |
543 | struct recent_entry *e; | |
544 | char buf[sizeof("+b335:1d35:1e55:dead:c0de:1715:5afe:c0de")]; | |
545 | const char *c = buf; | |
546 | union nf_inet_addr addr; | |
547 | u_int16_t family; | |
548 | bool add, succ; | |
549 | ||
550 | if (size == 0) | |
551 | return 0; | |
552 | if (size > sizeof(buf)) | |
553 | size = sizeof(buf); | |
554 | if (copy_from_user(buf, input, size) != 0) | |
555 | return -EFAULT; | |
556 | ||
557 | /* Strict protocol! */ | |
558 | if (*loff != 0) | |
559 | return -ESPIPE; | |
560 | switch (*c) { | |
561 | case '/': /* flush table */ | |
562 | spin_lock_bh(&recent_lock); | |
563 | recent_table_flush(t); | |
564 | spin_unlock_bh(&recent_lock); | |
565 | return size; | |
566 | case '-': /* remove address */ | |
567 | add = false; | |
568 | break; | |
569 | case '+': /* add address */ | |
570 | add = true; | |
571 | break; | |
572 | default: | |
573 | printk(KERN_INFO KBUILD_MODNAME ": Need +ip, -ip or /\n"); | |
574 | return -EINVAL; | |
575 | } | |
576 | ||
577 | ++c; | |
578 | --size; | |
579 | if (strnchr(c, size, ':') != NULL) { | |
ee999d8b | 580 | family = NFPROTO_IPV6; |
079aa88f JE |
581 | succ = in6_pton(c, size, (void *)&addr, '\n', NULL); |
582 | } else { | |
ee999d8b | 583 | family = NFPROTO_IPV4; |
079aa88f JE |
584 | succ = in4_pton(c, size, (void *)&addr, '\n', NULL); |
585 | } | |
586 | ||
587 | if (!succ) { | |
588 | printk(KERN_INFO KBUILD_MODNAME ": illegal address written " | |
589 | "to procfs\n"); | |
590 | return -EINVAL; | |
591 | } | |
592 | ||
593 | spin_lock_bh(&recent_lock); | |
594 | e = recent_entry_lookup(t, &addr, family, 0); | |
595 | if (e == NULL) { | |
596 | if (add) | |
597 | recent_entry_init(t, &addr, family, 0); | |
598 | } else { | |
599 | if (add) | |
600 | recent_entry_update(t, e); | |
601 | else | |
602 | recent_entry_remove(t, e); | |
603 | } | |
604 | spin_unlock_bh(&recent_lock); | |
605 | /* Note we removed one above */ | |
606 | *loff += size + 1; | |
607 | return size + 1; | |
608 | } | |
609 | ||
610 | static const struct file_operations recent_mt_fops = { | |
611 | .open = recent_seq_open, | |
612 | .read = seq_read, | |
613 | .write = recent_mt_proc_write, | |
614 | .release = seq_release_private, | |
615 | .owner = THIS_MODULE, | |
616 | }; | |
1da177e4 | 617 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 618 | |
079aa88f JE |
619 | static struct xt_match recent_mt_reg[] __read_mostly = { |
620 | { | |
621 | .name = "recent", | |
622 | .revision = 0, | |
ee999d8b | 623 | .family = NFPROTO_IPV4, |
079aa88f JE |
624 | .match = recent_mt, |
625 | .matchsize = sizeof(struct xt_recent_mtinfo), | |
626 | .checkentry = recent_mt_check, | |
627 | .destroy = recent_mt_destroy, | |
628 | .me = THIS_MODULE, | |
629 | }, | |
630 | { | |
631 | .name = "recent", | |
632 | .revision = 0, | |
ee999d8b | 633 | .family = NFPROTO_IPV6, |
079aa88f JE |
634 | .match = recent_mt, |
635 | .matchsize = sizeof(struct xt_recent_mtinfo), | |
636 | .checkentry = recent_mt_check, | |
637 | .destroy = recent_mt_destroy, | |
638 | .me = THIS_MODULE, | |
639 | }, | |
1da177e4 LT |
640 | }; |
641 | ||
d3c5ee6d | 642 | static int __init recent_mt_init(void) |
1da177e4 | 643 | { |
404bdbfd | 644 | int err; |
1da177e4 | 645 | |
404bdbfd PM |
646 | if (!ip_list_tot || !ip_pkt_list_tot || ip_pkt_list_tot > 255) |
647 | return -EINVAL; | |
648 | ip_list_hash_size = 1 << fls(ip_list_tot); | |
1da177e4 | 649 | |
079aa88f | 650 | err = xt_register_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg)); |
404bdbfd | 651 | #ifdef CONFIG_PROC_FS |
1da177e4 | 652 | if (err) |
404bdbfd | 653 | return err; |
079aa88f JE |
654 | recent_proc_dir = proc_mkdir("xt_recent", init_net.proc_net); |
655 | if (recent_proc_dir == NULL) { | |
656 | xt_unregister_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg)); | |
657 | err = -ENOMEM; | |
658 | } | |
659 | #ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT | |
660 | if (err < 0) | |
661 | return err; | |
662 | proc_old_dir = proc_mkdir("ipt_recent", init_net.proc_net); | |
663 | if (proc_old_dir == NULL) { | |
664 | remove_proc_entry("xt_recent", init_net.proc_net); | |
665 | xt_unregister_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg)); | |
404bdbfd PM |
666 | err = -ENOMEM; |
667 | } | |
079aa88f | 668 | #endif |
404bdbfd | 669 | #endif |
1da177e4 LT |
670 | return err; |
671 | } | |
672 | ||
d3c5ee6d | 673 | static void __exit recent_mt_exit(void) |
1da177e4 | 674 | { |
404bdbfd | 675 | BUG_ON(!list_empty(&tables)); |
079aa88f | 676 | xt_unregister_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg)); |
404bdbfd | 677 | #ifdef CONFIG_PROC_FS |
079aa88f | 678 | #ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT |
457c4cbc | 679 | remove_proc_entry("ipt_recent", init_net.proc_net); |
079aa88f JE |
680 | #endif |
681 | remove_proc_entry("xt_recent", init_net.proc_net); | |
404bdbfd | 682 | #endif |
1da177e4 LT |
683 | } |
684 | ||
d3c5ee6d JE |
685 | module_init(recent_mt_init); |
686 | module_exit(recent_mt_exit); |