Commit | Line | Data |
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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> |
7d07d563 | 31 | #include <net/netns/generic.h> |
1da177e4 | 32 | |
6709dbbb | 33 | #include <linux/netfilter/x_tables.h> |
e948b20a | 34 | #include <linux/netfilter/xt_recent.h> |
1da177e4 | 35 | |
404bdbfd | 36 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
079aa88f | 37 | MODULE_AUTHOR("Jan Engelhardt <jengelh@computergmbh.de>"); |
2ae15b64 | 38 | MODULE_DESCRIPTION("Xtables: \"recently-seen\" host matching for IPv4"); |
404bdbfd | 39 | MODULE_LICENSE("GPL"); |
e948b20a | 40 | MODULE_ALIAS("ipt_recent"); |
079aa88f | 41 | MODULE_ALIAS("ip6t_recent"); |
1da177e4 | 42 | |
e7be6994 PM |
43 | static unsigned int ip_list_tot = 100; |
44 | static unsigned int ip_pkt_list_tot = 20; | |
45 | static unsigned int ip_list_hash_size = 0; | |
46 | static unsigned int ip_list_perms = 0644; | |
b93ff783 DDG |
47 | static unsigned int ip_list_uid = 0; |
48 | static unsigned int ip_list_gid = 0; | |
e7be6994 PM |
49 | module_param(ip_list_tot, uint, 0400); |
50 | module_param(ip_pkt_list_tot, uint, 0400); | |
51 | module_param(ip_list_hash_size, uint, 0400); | |
52 | module_param(ip_list_perms, uint, 0400); | |
b93ff783 DDG |
53 | module_param(ip_list_uid, uint, 0400); |
54 | module_param(ip_list_gid, uint, 0400); | |
404bdbfd PM |
55 | MODULE_PARM_DESC(ip_list_tot, "number of IPs to remember per list"); |
56 | MODULE_PARM_DESC(ip_pkt_list_tot, "number of packets per IP to remember (max. 255)"); | |
57 | MODULE_PARM_DESC(ip_list_hash_size, "size of hash table used to look up IPs"); | |
079aa88f JE |
58 | MODULE_PARM_DESC(ip_list_perms, "permissions on /proc/net/xt_recent/* files"); |
59 | MODULE_PARM_DESC(ip_list_uid,"owner of /proc/net/xt_recent/* files"); | |
60 | MODULE_PARM_DESC(ip_list_gid,"owning group of /proc/net/xt_recent/* files"); | |
404bdbfd | 61 | |
404bdbfd PM |
62 | struct recent_entry { |
63 | struct list_head list; | |
64 | struct list_head lru_list; | |
079aa88f JE |
65 | union nf_inet_addr addr; |
66 | u_int16_t family; | |
404bdbfd PM |
67 | u_int8_t ttl; |
68 | u_int8_t index; | |
69 | u_int16_t nstamps; | |
70 | unsigned long stamps[0]; | |
1da177e4 LT |
71 | }; |
72 | ||
404bdbfd PM |
73 | struct recent_table { |
74 | struct list_head list; | |
e948b20a | 75 | char name[XT_RECENT_NAME_LEN]; |
404bdbfd PM |
76 | unsigned int refcnt; |
77 | unsigned int entries; | |
78 | struct list_head lru_list; | |
79 | struct list_head iphash[0]; | |
1da177e4 LT |
80 | }; |
81 | ||
7d07d563 AD |
82 | struct recent_net { |
83 | struct list_head tables; | |
84 | #ifdef CONFIG_PROC_FS | |
85 | struct proc_dir_entry *xt_recent; | |
86 | #ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT | |
87 | struct proc_dir_entry *ipt_recent; | |
88 | #endif | |
89 | #endif | |
90 | }; | |
91 | ||
92 | static int recent_net_id; | |
93 | static inline struct recent_net *recent_pernet(struct net *net) | |
94 | { | |
95 | return net_generic(net, recent_net_id); | |
96 | } | |
97 | ||
1da177e4 | 98 | static DEFINE_SPINLOCK(recent_lock); |
a0e889bb | 99 | static DEFINE_MUTEX(recent_mutex); |
1da177e4 LT |
100 | |
101 | #ifdef CONFIG_PROC_FS | |
079aa88f | 102 | static const struct file_operations recent_old_fops, recent_mt_fops; |
1da177e4 LT |
103 | #endif |
104 | ||
294188ae JE |
105 | static u_int32_t hash_rnd __read_mostly; |
106 | static bool hash_rnd_inited __read_mostly; | |
079aa88f | 107 | |
294188ae | 108 | static inline unsigned int recent_entry_hash4(const union nf_inet_addr *addr) |
079aa88f | 109 | { |
079aa88f JE |
110 | return jhash_1word((__force u32)addr->ip, hash_rnd) & |
111 | (ip_list_hash_size - 1); | |
112 | } | |
1da177e4 | 113 | |
294188ae | 114 | static inline unsigned int recent_entry_hash6(const union nf_inet_addr *addr) |
1da177e4 | 115 | { |
079aa88f JE |
116 | return jhash2((u32 *)addr->ip6, ARRAY_SIZE(addr->ip6), hash_rnd) & |
117 | (ip_list_hash_size - 1); | |
1da177e4 LT |
118 | } |
119 | ||
404bdbfd | 120 | static struct recent_entry * |
079aa88f JE |
121 | recent_entry_lookup(const struct recent_table *table, |
122 | const union nf_inet_addr *addrp, u_int16_t family, | |
123 | u_int8_t ttl) | |
1da177e4 | 124 | { |
404bdbfd PM |
125 | struct recent_entry *e; |
126 | unsigned int h; | |
127 | ||
ee999d8b | 128 | if (family == NFPROTO_IPV4) |
079aa88f JE |
129 | h = recent_entry_hash4(addrp); |
130 | else | |
131 | h = recent_entry_hash6(addrp); | |
132 | ||
404bdbfd | 133 | list_for_each_entry(e, &table->iphash[h], list) |
079aa88f JE |
134 | if (e->family == family && |
135 | memcmp(&e->addr, addrp, sizeof(e->addr)) == 0 && | |
136 | (ttl == e->ttl || ttl == 0 || e->ttl == 0)) | |
404bdbfd PM |
137 | return e; |
138 | return NULL; | |
139 | } | |
1da177e4 | 140 | |
404bdbfd PM |
141 | static void recent_entry_remove(struct recent_table *t, struct recent_entry *e) |
142 | { | |
143 | list_del(&e->list); | |
144 | list_del(&e->lru_list); | |
145 | kfree(e); | |
146 | t->entries--; | |
147 | } | |
1da177e4 | 148 | |
404bdbfd | 149 | static struct recent_entry * |
079aa88f JE |
150 | recent_entry_init(struct recent_table *t, const union nf_inet_addr *addr, |
151 | u_int16_t family, u_int8_t ttl) | |
404bdbfd PM |
152 | { |
153 | struct recent_entry *e; | |
1da177e4 | 154 | |
404bdbfd PM |
155 | if (t->entries >= ip_list_tot) { |
156 | e = list_entry(t->lru_list.next, struct recent_entry, lru_list); | |
157 | recent_entry_remove(t, e); | |
1da177e4 | 158 | } |
404bdbfd PM |
159 | e = kmalloc(sizeof(*e) + sizeof(e->stamps[0]) * ip_pkt_list_tot, |
160 | GFP_ATOMIC); | |
161 | if (e == NULL) | |
162 | return NULL; | |
079aa88f | 163 | memcpy(&e->addr, addr, sizeof(e->addr)); |
404bdbfd PM |
164 | e->ttl = ttl; |
165 | e->stamps[0] = jiffies; | |
166 | e->nstamps = 1; | |
167 | e->index = 1; | |
079aa88f | 168 | e->family = family; |
ee999d8b | 169 | if (family == NFPROTO_IPV4) |
079aa88f JE |
170 | list_add_tail(&e->list, &t->iphash[recent_entry_hash4(addr)]); |
171 | else | |
172 | list_add_tail(&e->list, &t->iphash[recent_entry_hash6(addr)]); | |
404bdbfd PM |
173 | list_add_tail(&e->lru_list, &t->lru_list); |
174 | t->entries++; | |
175 | return e; | |
176 | } | |
1da177e4 | 177 | |
404bdbfd PM |
178 | static void recent_entry_update(struct recent_table *t, struct recent_entry *e) |
179 | { | |
180 | e->stamps[e->index++] = jiffies; | |
181 | if (e->index > e->nstamps) | |
182 | e->nstamps = e->index; | |
183 | e->index %= ip_pkt_list_tot; | |
184 | list_move_tail(&e->lru_list, &t->lru_list); | |
185 | } | |
1da177e4 | 186 | |
7d07d563 AD |
187 | static struct recent_table *recent_table_lookup(struct recent_net *recent_net, |
188 | const char *name) | |
404bdbfd PM |
189 | { |
190 | struct recent_table *t; | |
1da177e4 | 191 | |
7d07d563 | 192 | list_for_each_entry(t, &recent_net->tables, list) |
404bdbfd PM |
193 | if (!strcmp(t->name, name)) |
194 | return t; | |
195 | return NULL; | |
196 | } | |
1da177e4 | 197 | |
404bdbfd PM |
198 | static void recent_table_flush(struct recent_table *t) |
199 | { | |
200 | struct recent_entry *e, *next; | |
201 | unsigned int i; | |
1da177e4 | 202 | |
7c4e36bc | 203 | for (i = 0; i < ip_list_hash_size; i++) |
404bdbfd PM |
204 | list_for_each_entry_safe(e, next, &t->iphash[i], list) |
205 | recent_entry_remove(t, e); | |
1da177e4 LT |
206 | } |
207 | ||
1d93a9cb | 208 | static bool |
f7108a20 | 209 | recent_mt(const struct sk_buff *skb, const struct xt_match_param *par) |
1da177e4 | 210 | { |
7d07d563 AD |
211 | struct net *net = dev_net(par->in ? par->in : par->out); |
212 | struct recent_net *recent_net = recent_pernet(net); | |
f7108a20 | 213 | const struct xt_recent_mtinfo *info = par->matchinfo; |
404bdbfd PM |
214 | struct recent_table *t; |
215 | struct recent_entry *e; | |
079aa88f | 216 | union nf_inet_addr addr = {}; |
404bdbfd | 217 | u_int8_t ttl; |
1d93a9cb | 218 | bool ret = info->invert; |
1da177e4 | 219 | |
f7108a20 | 220 | if (par->match->family == NFPROTO_IPV4) { |
079aa88f JE |
221 | const struct iphdr *iph = ip_hdr(skb); |
222 | ||
223 | if (info->side == XT_RECENT_DEST) | |
224 | addr.ip = iph->daddr; | |
225 | else | |
226 | addr.ip = iph->saddr; | |
227 | ||
228 | ttl = iph->ttl; | |
229 | } else { | |
230 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
231 | ||
232 | if (info->side == XT_RECENT_DEST) | |
233 | memcpy(&addr.in6, &iph->daddr, sizeof(addr.in6)); | |
234 | else | |
235 | memcpy(&addr.in6, &iph->saddr, sizeof(addr.in6)); | |
236 | ||
237 | ttl = iph->hop_limit; | |
238 | } | |
1da177e4 | 239 | |
404bdbfd | 240 | /* use TTL as seen before forwarding */ |
f7108a20 | 241 | if (par->out != NULL && skb->sk == NULL) |
404bdbfd | 242 | ttl++; |
1da177e4 | 243 | |
1da177e4 | 244 | spin_lock_bh(&recent_lock); |
7d07d563 | 245 | t = recent_table_lookup(recent_net, info->name); |
f7108a20 | 246 | e = recent_entry_lookup(t, &addr, par->match->family, |
079aa88f | 247 | (info->check_set & XT_RECENT_TTL) ? ttl : 0); |
404bdbfd | 248 | if (e == NULL) { |
e948b20a | 249 | if (!(info->check_set & XT_RECENT_SET)) |
404bdbfd | 250 | goto out; |
f7108a20 | 251 | e = recent_entry_init(t, &addr, par->match->family, ttl); |
404bdbfd | 252 | if (e == NULL) |
f7108a20 | 253 | *par->hotdrop = true; |
1d93a9cb | 254 | ret = !ret; |
404bdbfd | 255 | goto out; |
1da177e4 LT |
256 | } |
257 | ||
e948b20a | 258 | if (info->check_set & XT_RECENT_SET) |
1d93a9cb | 259 | ret = !ret; |
e948b20a | 260 | else if (info->check_set & XT_RECENT_REMOVE) { |
404bdbfd | 261 | recent_entry_remove(t, e); |
1d93a9cb | 262 | ret = !ret; |
e948b20a | 263 | } else if (info->check_set & (XT_RECENT_CHECK | XT_RECENT_UPDATE)) { |
855304af | 264 | unsigned long time = jiffies - info->seconds * HZ; |
404bdbfd PM |
265 | unsigned int i, hits = 0; |
266 | ||
267 | for (i = 0; i < e->nstamps; i++) { | |
855304af | 268 | if (info->seconds && time_after(time, e->stamps[i])) |
404bdbfd PM |
269 | continue; |
270 | if (++hits >= info->hit_count) { | |
1d93a9cb | 271 | ret = !ret; |
404bdbfd | 272 | break; |
1da177e4 | 273 | } |
1da177e4 | 274 | } |
1da177e4 LT |
275 | } |
276 | ||
e948b20a JE |
277 | if (info->check_set & XT_RECENT_SET || |
278 | (info->check_set & XT_RECENT_UPDATE && ret)) { | |
404bdbfd PM |
279 | recent_entry_update(t, e); |
280 | e->ttl = ttl; | |
281 | } | |
282 | out: | |
283 | spin_unlock_bh(&recent_lock); | |
284 | return ret; | |
1da177e4 LT |
285 | } |
286 | ||
9b4fce7a | 287 | static bool recent_mt_check(const struct xt_mtchk_param *par) |
1da177e4 | 288 | { |
7d07d563 | 289 | struct recent_net *recent_net = recent_pernet(par->net); |
9b4fce7a | 290 | const struct xt_recent_mtinfo *info = par->matchinfo; |
404bdbfd | 291 | struct recent_table *t; |
b0ceb560 AD |
292 | #ifdef CONFIG_PROC_FS |
293 | struct proc_dir_entry *pde; | |
294 | #endif | |
404bdbfd | 295 | unsigned i; |
ccb79bdc | 296 | bool ret = false; |
1da177e4 | 297 | |
294188ae JE |
298 | if (unlikely(!hash_rnd_inited)) { |
299 | get_random_bytes(&hash_rnd, sizeof(hash_rnd)); | |
300 | hash_rnd_inited = true; | |
301 | } | |
404bdbfd | 302 | if (hweight8(info->check_set & |
e948b20a JE |
303 | (XT_RECENT_SET | XT_RECENT_REMOVE | |
304 | XT_RECENT_CHECK | XT_RECENT_UPDATE)) != 1) | |
ccb79bdc | 305 | return false; |
e948b20a | 306 | if ((info->check_set & (XT_RECENT_SET | XT_RECENT_REMOVE)) && |
404bdbfd | 307 | (info->seconds || info->hit_count)) |
ccb79bdc | 308 | return false; |
d0ebf133 DHZ |
309 | if (info->hit_count > ip_pkt_list_tot) |
310 | return false; | |
404bdbfd | 311 | if (info->name[0] == '\0' || |
e948b20a | 312 | strnlen(info->name, XT_RECENT_NAME_LEN) == XT_RECENT_NAME_LEN) |
ccb79bdc | 313 | return false; |
1da177e4 | 314 | |
a0e889bb | 315 | mutex_lock(&recent_mutex); |
7d07d563 | 316 | t = recent_table_lookup(recent_net, info->name); |
404bdbfd PM |
317 | if (t != NULL) { |
318 | t->refcnt++; | |
ccb79bdc | 319 | ret = true; |
404bdbfd | 320 | goto out; |
1da177e4 LT |
321 | } |
322 | ||
404bdbfd | 323 | t = kzalloc(sizeof(*t) + sizeof(t->iphash[0]) * ip_list_hash_size, |
a0e889bb | 324 | GFP_KERNEL); |
404bdbfd PM |
325 | if (t == NULL) |
326 | goto out; | |
2b2283d0 | 327 | t->refcnt = 1; |
404bdbfd PM |
328 | strcpy(t->name, info->name); |
329 | INIT_LIST_HEAD(&t->lru_list); | |
330 | for (i = 0; i < ip_list_hash_size; i++) | |
331 | INIT_LIST_HEAD(&t->iphash[i]); | |
332 | #ifdef CONFIG_PROC_FS | |
7d07d563 | 333 | pde = proc_create_data(t->name, ip_list_perms, recent_net->xt_recent, |
b09eec16 | 334 | &recent_mt_fops, t); |
b0ceb560 | 335 | if (pde == NULL) { |
404bdbfd PM |
336 | kfree(t); |
337 | goto out; | |
1da177e4 | 338 | } |
b0ceb560 AD |
339 | pde->uid = ip_list_uid; |
340 | pde->gid = ip_list_gid; | |
079aa88f | 341 | #ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT |
7d07d563 | 342 | pde = proc_create_data(t->name, ip_list_perms, recent_net->ipt_recent, |
b09eec16 | 343 | &recent_old_fops, t); |
b0ceb560 | 344 | if (pde == NULL) { |
7d07d563 | 345 | remove_proc_entry(t->name, recent_net->xt_recent); |
079aa88f JE |
346 | kfree(t); |
347 | goto out; | |
348 | } | |
b0ceb560 AD |
349 | pde->uid = ip_list_uid; |
350 | pde->gid = ip_list_gid; | |
079aa88f | 351 | #endif |
1da177e4 | 352 | #endif |
a0e889bb | 353 | spin_lock_bh(&recent_lock); |
7d07d563 | 354 | list_add_tail(&t->list, &recent_net->tables); |
a0e889bb | 355 | spin_unlock_bh(&recent_lock); |
ccb79bdc | 356 | ret = true; |
404bdbfd | 357 | out: |
a0e889bb | 358 | mutex_unlock(&recent_mutex); |
404bdbfd PM |
359 | return ret; |
360 | } | |
1da177e4 | 361 | |
6be3d859 | 362 | static void recent_mt_destroy(const struct xt_mtdtor_param *par) |
404bdbfd | 363 | { |
7d07d563 | 364 | struct recent_net *recent_net = recent_pernet(par->net); |
6be3d859 | 365 | const struct xt_recent_mtinfo *info = par->matchinfo; |
404bdbfd | 366 | struct recent_table *t; |
1da177e4 | 367 | |
a0e889bb | 368 | mutex_lock(&recent_mutex); |
7d07d563 | 369 | t = recent_table_lookup(recent_net, info->name); |
404bdbfd | 370 | if (--t->refcnt == 0) { |
a0e889bb | 371 | spin_lock_bh(&recent_lock); |
404bdbfd | 372 | list_del(&t->list); |
a0e889bb | 373 | spin_unlock_bh(&recent_lock); |
404bdbfd | 374 | #ifdef CONFIG_PROC_FS |
079aa88f | 375 | #ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT |
7d07d563 | 376 | remove_proc_entry(t->name, recent_net->ipt_recent); |
079aa88f | 377 | #endif |
7d07d563 | 378 | remove_proc_entry(t->name, recent_net->xt_recent); |
1da177e4 | 379 | #endif |
a8ddc916 | 380 | recent_table_flush(t); |
404bdbfd | 381 | kfree(t); |
1da177e4 | 382 | } |
a0e889bb | 383 | mutex_unlock(&recent_mutex); |
404bdbfd | 384 | } |
1da177e4 | 385 | |
404bdbfd PM |
386 | #ifdef CONFIG_PROC_FS |
387 | struct recent_iter_state { | |
079aa88f | 388 | const struct recent_table *table; |
404bdbfd PM |
389 | unsigned int bucket; |
390 | }; | |
1da177e4 | 391 | |
404bdbfd | 392 | static void *recent_seq_start(struct seq_file *seq, loff_t *pos) |
855304af | 393 | __acquires(recent_lock) |
404bdbfd PM |
394 | { |
395 | struct recent_iter_state *st = seq->private; | |
a47362a2 | 396 | const struct recent_table *t = st->table; |
404bdbfd PM |
397 | struct recent_entry *e; |
398 | loff_t p = *pos; | |
1da177e4 | 399 | |
1da177e4 | 400 | spin_lock_bh(&recent_lock); |
1da177e4 | 401 | |
7c4e36bc JE |
402 | for (st->bucket = 0; st->bucket < ip_list_hash_size; st->bucket++) |
403 | list_for_each_entry(e, &t->iphash[st->bucket], list) | |
404bdbfd PM |
404 | if (p-- == 0) |
405 | return e; | |
404bdbfd PM |
406 | return NULL; |
407 | } | |
1da177e4 | 408 | |
404bdbfd PM |
409 | static void *recent_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
410 | { | |
411 | struct recent_iter_state *st = seq->private; | |
3cf93c96 | 412 | const struct recent_table *t = st->table; |
079aa88f JE |
413 | const struct recent_entry *e = v; |
414 | const struct list_head *head = e->list.next; | |
404bdbfd PM |
415 | |
416 | while (head == &t->iphash[st->bucket]) { | |
417 | if (++st->bucket >= ip_list_hash_size) | |
418 | return NULL; | |
419 | head = t->iphash[st->bucket].next; | |
420 | } | |
421 | (*pos)++; | |
422 | return list_entry(head, struct recent_entry, list); | |
1da177e4 LT |
423 | } |
424 | ||
404bdbfd | 425 | static void recent_seq_stop(struct seq_file *s, void *v) |
855304af | 426 | __releases(recent_lock) |
1da177e4 | 427 | { |
404bdbfd PM |
428 | spin_unlock_bh(&recent_lock); |
429 | } | |
1da177e4 | 430 | |
404bdbfd PM |
431 | static int recent_seq_show(struct seq_file *seq, void *v) |
432 | { | |
3cf93c96 | 433 | const struct recent_entry *e = v; |
404bdbfd PM |
434 | unsigned int i; |
435 | ||
436 | i = (e->index - 1) % ip_pkt_list_tot; | |
ee999d8b | 437 | if (e->family == NFPROTO_IPV4) |
14d5e834 HH |
438 | seq_printf(seq, "src=%pI4 ttl: %u last_seen: %lu oldest_pkt: %u", |
439 | &e->addr.ip, e->ttl, e->stamps[i], e->index); | |
079aa88f | 440 | else |
5b095d98 | 441 | seq_printf(seq, "src=%pI6 ttl: %u last_seen: %lu oldest_pkt: %u", |
38ff4fa4 | 442 | &e->addr.in6, e->ttl, e->stamps[i], e->index); |
404bdbfd PM |
443 | for (i = 0; i < e->nstamps; i++) |
444 | seq_printf(seq, "%s %lu", i ? "," : "", e->stamps[i]); | |
445 | seq_printf(seq, "\n"); | |
446 | return 0; | |
447 | } | |
1da177e4 | 448 | |
56b3d975 | 449 | static const struct seq_operations recent_seq_ops = { |
404bdbfd PM |
450 | .start = recent_seq_start, |
451 | .next = recent_seq_next, | |
452 | .stop = recent_seq_stop, | |
453 | .show = recent_seq_show, | |
454 | }; | |
1da177e4 | 455 | |
404bdbfd PM |
456 | static int recent_seq_open(struct inode *inode, struct file *file) |
457 | { | |
458 | struct proc_dir_entry *pde = PDE(inode); | |
404bdbfd | 459 | struct recent_iter_state *st; |
404bdbfd | 460 | |
e2da5913 | 461 | st = __seq_open_private(file, &recent_seq_ops, sizeof(*st)); |
404bdbfd PM |
462 | if (st == NULL) |
463 | return -ENOMEM; | |
3af8e31c | 464 | |
404bdbfd | 465 | st->table = pde->data; |
e2da5913 | 466 | return 0; |
404bdbfd | 467 | } |
1da177e4 | 468 | |
079aa88f JE |
469 | #ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT |
470 | static int recent_old_seq_open(struct inode *inode, struct file *filp) | |
471 | { | |
472 | static bool warned_of_old; | |
473 | ||
474 | if (unlikely(!warned_of_old)) { | |
475 | printk(KERN_INFO KBUILD_MODNAME ": Use of /proc/net/ipt_recent" | |
476 | " is deprecated; use /proc/net/xt_recent.\n"); | |
477 | warned_of_old = true; | |
478 | } | |
479 | return recent_seq_open(inode, filp); | |
480 | } | |
481 | ||
482 | static ssize_t recent_old_proc_write(struct file *file, | |
483 | const char __user *input, | |
484 | size_t size, loff_t *loff) | |
404bdbfd | 485 | { |
3cf93c96 | 486 | const struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode); |
404bdbfd PM |
487 | struct recent_table *t = pde->data; |
488 | struct recent_entry *e; | |
489 | char buf[sizeof("+255.255.255.255")], *c = buf; | |
37e55cf0 | 490 | union nf_inet_addr addr = {}; |
404bdbfd PM |
491 | int add; |
492 | ||
493 | if (size > sizeof(buf)) | |
494 | size = sizeof(buf); | |
495 | if (copy_from_user(buf, input, size)) | |
496 | return -EFAULT; | |
079aa88f | 497 | |
e7d2860b | 498 | c = skip_spaces(c); |
404bdbfd PM |
499 | |
500 | if (size - (c - buf) < 5) | |
501 | return c - buf; | |
502 | if (!strncmp(c, "clear", 5)) { | |
503 | c += 5; | |
504 | spin_lock_bh(&recent_lock); | |
505 | recent_table_flush(t); | |
1da177e4 | 506 | spin_unlock_bh(&recent_lock); |
404bdbfd | 507 | return c - buf; |
1da177e4 | 508 | } |
1da177e4 | 509 | |
404bdbfd PM |
510 | switch (*c) { |
511 | case '-': | |
512 | add = 0; | |
513 | c++; | |
514 | break; | |
515 | case '+': | |
516 | c++; | |
517 | default: | |
518 | add = 1; | |
519 | break; | |
1da177e4 | 520 | } |
37e55cf0 | 521 | addr.ip = in_aton(c); |
1da177e4 | 522 | |
404bdbfd | 523 | spin_lock_bh(&recent_lock); |
37e55cf0 | 524 | e = recent_entry_lookup(t, &addr, NFPROTO_IPV4, 0); |
404bdbfd PM |
525 | if (e == NULL) { |
526 | if (add) | |
37e55cf0 | 527 | recent_entry_init(t, &addr, NFPROTO_IPV4, 0); |
404bdbfd PM |
528 | } else { |
529 | if (add) | |
530 | recent_entry_update(t, e); | |
531 | else | |
532 | recent_entry_remove(t, e); | |
1da177e4 | 533 | } |
1da177e4 | 534 | spin_unlock_bh(&recent_lock); |
404bdbfd PM |
535 | return size; |
536 | } | |
1da177e4 | 537 | |
079aa88f JE |
538 | static const struct file_operations recent_old_fops = { |
539 | .open = recent_old_seq_open, | |
404bdbfd | 540 | .read = seq_read, |
079aa88f | 541 | .write = recent_old_proc_write, |
404bdbfd PM |
542 | .release = seq_release_private, |
543 | .owner = THIS_MODULE, | |
544 | }; | |
079aa88f JE |
545 | #endif |
546 | ||
547 | static ssize_t | |
548 | recent_mt_proc_write(struct file *file, const char __user *input, | |
549 | size_t size, loff_t *loff) | |
550 | { | |
551 | const struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode); | |
552 | struct recent_table *t = pde->data; | |
553 | struct recent_entry *e; | |
554 | char buf[sizeof("+b335:1d35:1e55:dead:c0de:1715:5afe:c0de")]; | |
555 | const char *c = buf; | |
325fb5b4 | 556 | union nf_inet_addr addr = {}; |
079aa88f JE |
557 | u_int16_t family; |
558 | bool add, succ; | |
559 | ||
560 | if (size == 0) | |
561 | return 0; | |
562 | if (size > sizeof(buf)) | |
563 | size = sizeof(buf); | |
564 | if (copy_from_user(buf, input, size) != 0) | |
565 | return -EFAULT; | |
566 | ||
567 | /* Strict protocol! */ | |
568 | if (*loff != 0) | |
569 | return -ESPIPE; | |
570 | switch (*c) { | |
571 | case '/': /* flush table */ | |
572 | spin_lock_bh(&recent_lock); | |
573 | recent_table_flush(t); | |
574 | spin_unlock_bh(&recent_lock); | |
575 | return size; | |
576 | case '-': /* remove address */ | |
577 | add = false; | |
578 | break; | |
579 | case '+': /* add address */ | |
580 | add = true; | |
581 | break; | |
582 | default: | |
583 | printk(KERN_INFO KBUILD_MODNAME ": Need +ip, -ip or /\n"); | |
584 | return -EINVAL; | |
585 | } | |
586 | ||
587 | ++c; | |
588 | --size; | |
589 | if (strnchr(c, size, ':') != NULL) { | |
ee999d8b | 590 | family = NFPROTO_IPV6; |
079aa88f JE |
591 | succ = in6_pton(c, size, (void *)&addr, '\n', NULL); |
592 | } else { | |
ee999d8b | 593 | family = NFPROTO_IPV4; |
079aa88f JE |
594 | succ = in4_pton(c, size, (void *)&addr, '\n', NULL); |
595 | } | |
596 | ||
597 | if (!succ) { | |
598 | printk(KERN_INFO KBUILD_MODNAME ": illegal address written " | |
599 | "to procfs\n"); | |
600 | return -EINVAL; | |
601 | } | |
602 | ||
603 | spin_lock_bh(&recent_lock); | |
604 | e = recent_entry_lookup(t, &addr, family, 0); | |
605 | if (e == NULL) { | |
606 | if (add) | |
607 | recent_entry_init(t, &addr, family, 0); | |
608 | } else { | |
609 | if (add) | |
610 | recent_entry_update(t, e); | |
611 | else | |
612 | recent_entry_remove(t, e); | |
613 | } | |
614 | spin_unlock_bh(&recent_lock); | |
615 | /* Note we removed one above */ | |
616 | *loff += size + 1; | |
617 | return size + 1; | |
618 | } | |
619 | ||
620 | static const struct file_operations recent_mt_fops = { | |
621 | .open = recent_seq_open, | |
622 | .read = seq_read, | |
623 | .write = recent_mt_proc_write, | |
624 | .release = seq_release_private, | |
625 | .owner = THIS_MODULE, | |
626 | }; | |
7d07d563 AD |
627 | |
628 | static int __net_init recent_proc_net_init(struct net *net) | |
629 | { | |
630 | struct recent_net *recent_net = recent_pernet(net); | |
631 | ||
632 | recent_net->xt_recent = proc_mkdir("xt_recent", net->proc_net); | |
633 | if (!recent_net->xt_recent) | |
634 | return -ENOMEM; | |
635 | #ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT | |
636 | recent_net->ipt_recent = proc_mkdir("ipt_recent", net->proc_net); | |
637 | if (!recent_net->ipt_recent) { | |
638 | proc_net_remove(net, "xt_recent"); | |
639 | return -ENOMEM; | |
640 | } | |
641 | #endif | |
642 | return 0; | |
643 | } | |
644 | ||
645 | static void __net_exit recent_proc_net_exit(struct net *net) | |
646 | { | |
647 | #ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT | |
648 | proc_net_remove(net, "ipt_recent"); | |
649 | #endif | |
650 | proc_net_remove(net, "xt_recent"); | |
651 | } | |
652 | #else | |
653 | static inline int recent_proc_net_init(struct net *net) | |
654 | { | |
655 | return 0; | |
656 | } | |
657 | ||
658 | static inline void recent_proc_net_exit(struct net *net) | |
659 | { | |
660 | } | |
1da177e4 | 661 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 662 | |
7d07d563 AD |
663 | static int __net_init recent_net_init(struct net *net) |
664 | { | |
665 | struct recent_net *recent_net = recent_pernet(net); | |
666 | ||
667 | INIT_LIST_HEAD(&recent_net->tables); | |
668 | return recent_proc_net_init(net); | |
669 | } | |
670 | ||
671 | static void __net_exit recent_net_exit(struct net *net) | |
672 | { | |
673 | struct recent_net *recent_net = recent_pernet(net); | |
674 | ||
675 | BUG_ON(!list_empty(&recent_net->tables)); | |
676 | recent_proc_net_exit(net); | |
677 | } | |
678 | ||
679 | static struct pernet_operations recent_net_ops = { | |
680 | .init = recent_net_init, | |
681 | .exit = recent_net_exit, | |
682 | .id = &recent_net_id, | |
683 | .size = sizeof(struct recent_net), | |
684 | }; | |
685 | ||
079aa88f JE |
686 | static struct xt_match recent_mt_reg[] __read_mostly = { |
687 | { | |
688 | .name = "recent", | |
689 | .revision = 0, | |
ee999d8b | 690 | .family = NFPROTO_IPV4, |
079aa88f JE |
691 | .match = recent_mt, |
692 | .matchsize = sizeof(struct xt_recent_mtinfo), | |
693 | .checkentry = recent_mt_check, | |
694 | .destroy = recent_mt_destroy, | |
695 | .me = THIS_MODULE, | |
696 | }, | |
697 | { | |
698 | .name = "recent", | |
699 | .revision = 0, | |
ee999d8b | 700 | .family = NFPROTO_IPV6, |
079aa88f JE |
701 | .match = recent_mt, |
702 | .matchsize = sizeof(struct xt_recent_mtinfo), | |
703 | .checkentry = recent_mt_check, | |
704 | .destroy = recent_mt_destroy, | |
705 | .me = THIS_MODULE, | |
706 | }, | |
1da177e4 LT |
707 | }; |
708 | ||
d3c5ee6d | 709 | static int __init recent_mt_init(void) |
1da177e4 | 710 | { |
404bdbfd | 711 | int err; |
1da177e4 | 712 | |
404bdbfd PM |
713 | if (!ip_list_tot || !ip_pkt_list_tot || ip_pkt_list_tot > 255) |
714 | return -EINVAL; | |
715 | ip_list_hash_size = 1 << fls(ip_list_tot); | |
1da177e4 | 716 | |
7d07d563 | 717 | err = register_pernet_subsys(&recent_net_ops); |
1da177e4 | 718 | if (err) |
404bdbfd | 719 | return err; |
7d07d563 AD |
720 | err = xt_register_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg)); |
721 | if (err) | |
722 | unregister_pernet_subsys(&recent_net_ops); | |
1da177e4 LT |
723 | return err; |
724 | } | |
725 | ||
d3c5ee6d | 726 | static void __exit recent_mt_exit(void) |
1da177e4 | 727 | { |
079aa88f | 728 | xt_unregister_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg)); |
7d07d563 | 729 | unregister_pernet_subsys(&recent_net_ops); |
1da177e4 LT |
730 | } |
731 | ||
d3c5ee6d JE |
732 | module_init(recent_mt_init); |
733 | module_exit(recent_mt_exit); |