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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 | */ | |
8bee4bad | 15 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
404bdbfd | 16 | #include <linux/init.h> |
6709dbbb | 17 | #include <linux/ip.h> |
079aa88f JE |
18 | #include <linux/ipv6.h> |
19 | #include <linux/module.h> | |
404bdbfd | 20 | #include <linux/moduleparam.h> |
1da177e4 | 21 | #include <linux/proc_fs.h> |
404bdbfd PM |
22 | #include <linux/seq_file.h> |
23 | #include <linux/string.h> | |
1da177e4 | 24 | #include <linux/ctype.h> |
404bdbfd PM |
25 | #include <linux/list.h> |
26 | #include <linux/random.h> | |
27 | #include <linux/jhash.h> | |
28 | #include <linux/bitops.h> | |
29 | #include <linux/skbuff.h> | |
30 | #include <linux/inet.h> | |
5a0e3ad6 | 31 | #include <linux/slab.h> |
457c4cbc | 32 | #include <net/net_namespace.h> |
7d07d563 | 33 | #include <net/netns/generic.h> |
1da177e4 | 34 | |
6709dbbb | 35 | #include <linux/netfilter/x_tables.h> |
e948b20a | 36 | #include <linux/netfilter/xt_recent.h> |
1da177e4 | 37 | |
404bdbfd | 38 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
408ffaa4 | 39 | MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>"); |
06bf514e | 40 | MODULE_DESCRIPTION("Xtables: \"recently-seen\" host matching"); |
404bdbfd | 41 | MODULE_LICENSE("GPL"); |
e948b20a | 42 | MODULE_ALIAS("ipt_recent"); |
079aa88f | 43 | MODULE_ALIAS("ip6t_recent"); |
1da177e4 | 44 | |
e7be6994 PM |
45 | static unsigned int ip_list_tot = 100; |
46 | static unsigned int ip_pkt_list_tot = 20; | |
47 | static unsigned int ip_list_hash_size = 0; | |
48 | static unsigned int ip_list_perms = 0644; | |
b93ff783 DDG |
49 | static unsigned int ip_list_uid = 0; |
50 | static unsigned int ip_list_gid = 0; | |
e7be6994 PM |
51 | module_param(ip_list_tot, uint, 0400); |
52 | module_param(ip_pkt_list_tot, uint, 0400); | |
53 | module_param(ip_list_hash_size, uint, 0400); | |
54 | module_param(ip_list_perms, uint, 0400); | |
5dc7a6d5 JE |
55 | module_param(ip_list_uid, uint, S_IRUGO | S_IWUSR); |
56 | module_param(ip_list_gid, uint, S_IRUGO | S_IWUSR); | |
404bdbfd | 57 | MODULE_PARM_DESC(ip_list_tot, "number of IPs to remember per list"); |
98e6d2d5 | 58 | MODULE_PARM_DESC(ip_pkt_list_tot, "number of packets per IP address to remember (max. 255)"); |
404bdbfd | 59 | MODULE_PARM_DESC(ip_list_hash_size, "size of hash table used to look up IPs"); |
079aa88f | 60 | MODULE_PARM_DESC(ip_list_perms, "permissions on /proc/net/xt_recent/* files"); |
5dc7a6d5 JE |
61 | MODULE_PARM_DESC(ip_list_uid, "default owner of /proc/net/xt_recent/* files"); |
62 | MODULE_PARM_DESC(ip_list_gid, "default owning group of /proc/net/xt_recent/* files"); | |
404bdbfd | 63 | |
404bdbfd PM |
64 | struct recent_entry { |
65 | struct list_head list; | |
66 | struct list_head lru_list; | |
079aa88f JE |
67 | union nf_inet_addr addr; |
68 | u_int16_t family; | |
404bdbfd PM |
69 | u_int8_t ttl; |
70 | u_int8_t index; | |
71 | u_int16_t nstamps; | |
72 | unsigned long stamps[0]; | |
1da177e4 LT |
73 | }; |
74 | ||
404bdbfd PM |
75 | struct recent_table { |
76 | struct list_head list; | |
e948b20a | 77 | char name[XT_RECENT_NAME_LEN]; |
404bdbfd PM |
78 | unsigned int refcnt; |
79 | unsigned int entries; | |
80 | struct list_head lru_list; | |
81 | struct list_head iphash[0]; | |
1da177e4 LT |
82 | }; |
83 | ||
7d07d563 AD |
84 | struct recent_net { |
85 | struct list_head tables; | |
86 | #ifdef CONFIG_PROC_FS | |
87 | struct proc_dir_entry *xt_recent; | |
7d07d563 AD |
88 | #endif |
89 | }; | |
90 | ||
91 | static int recent_net_id; | |
92 | static inline struct recent_net *recent_pernet(struct net *net) | |
93 | { | |
94 | return net_generic(net, recent_net_id); | |
95 | } | |
96 | ||
1da177e4 | 97 | static DEFINE_SPINLOCK(recent_lock); |
a0e889bb | 98 | static DEFINE_MUTEX(recent_mutex); |
1da177e4 LT |
99 | |
100 | #ifdef CONFIG_PROC_FS | |
079aa88f | 101 | static const struct file_operations recent_old_fops, recent_mt_fops; |
1da177e4 LT |
102 | #endif |
103 | ||
294188ae JE |
104 | static u_int32_t hash_rnd __read_mostly; |
105 | static bool hash_rnd_inited __read_mostly; | |
079aa88f | 106 | |
294188ae | 107 | static inline unsigned int recent_entry_hash4(const union nf_inet_addr *addr) |
079aa88f | 108 | { |
079aa88f JE |
109 | return jhash_1word((__force u32)addr->ip, hash_rnd) & |
110 | (ip_list_hash_size - 1); | |
111 | } | |
1da177e4 | 112 | |
294188ae | 113 | static inline unsigned int recent_entry_hash6(const union nf_inet_addr *addr) |
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 | |
0079c5ae TG |
148 | /* |
149 | * Drop entries with timestamps older then 'time'. | |
150 | */ | |
151 | static void recent_entry_reap(struct recent_table *t, unsigned long time) | |
152 | { | |
153 | struct recent_entry *e; | |
154 | ||
155 | /* | |
156 | * The head of the LRU list is always the oldest entry. | |
157 | */ | |
158 | e = list_entry(t->lru_list.next, struct recent_entry, lru_list); | |
159 | ||
160 | /* | |
161 | * The last time stamp is the most recent. | |
162 | */ | |
163 | if (time_after(time, e->stamps[e->index-1])) | |
164 | recent_entry_remove(t, e); | |
165 | } | |
166 | ||
404bdbfd | 167 | static struct recent_entry * |
079aa88f JE |
168 | recent_entry_init(struct recent_table *t, const union nf_inet_addr *addr, |
169 | u_int16_t family, u_int8_t ttl) | |
404bdbfd PM |
170 | { |
171 | struct recent_entry *e; | |
1da177e4 | 172 | |
404bdbfd PM |
173 | if (t->entries >= ip_list_tot) { |
174 | e = list_entry(t->lru_list.next, struct recent_entry, lru_list); | |
175 | recent_entry_remove(t, e); | |
1da177e4 | 176 | } |
404bdbfd PM |
177 | e = kmalloc(sizeof(*e) + sizeof(e->stamps[0]) * ip_pkt_list_tot, |
178 | GFP_ATOMIC); | |
179 | if (e == NULL) | |
180 | return NULL; | |
079aa88f | 181 | memcpy(&e->addr, addr, sizeof(e->addr)); |
404bdbfd PM |
182 | e->ttl = ttl; |
183 | e->stamps[0] = jiffies; | |
184 | e->nstamps = 1; | |
185 | e->index = 1; | |
079aa88f | 186 | e->family = family; |
ee999d8b | 187 | if (family == NFPROTO_IPV4) |
079aa88f JE |
188 | list_add_tail(&e->list, &t->iphash[recent_entry_hash4(addr)]); |
189 | else | |
190 | list_add_tail(&e->list, &t->iphash[recent_entry_hash6(addr)]); | |
404bdbfd PM |
191 | list_add_tail(&e->lru_list, &t->lru_list); |
192 | t->entries++; | |
193 | return e; | |
194 | } | |
1da177e4 | 195 | |
404bdbfd PM |
196 | static void recent_entry_update(struct recent_table *t, struct recent_entry *e) |
197 | { | |
2c08522e | 198 | e->index %= ip_pkt_list_tot; |
404bdbfd PM |
199 | e->stamps[e->index++] = jiffies; |
200 | if (e->index > e->nstamps) | |
201 | e->nstamps = e->index; | |
404bdbfd PM |
202 | list_move_tail(&e->lru_list, &t->lru_list); |
203 | } | |
1da177e4 | 204 | |
7d07d563 AD |
205 | static struct recent_table *recent_table_lookup(struct recent_net *recent_net, |
206 | const char *name) | |
404bdbfd PM |
207 | { |
208 | struct recent_table *t; | |
1da177e4 | 209 | |
7d07d563 | 210 | list_for_each_entry(t, &recent_net->tables, list) |
404bdbfd PM |
211 | if (!strcmp(t->name, name)) |
212 | return t; | |
213 | return NULL; | |
214 | } | |
1da177e4 | 215 | |
404bdbfd PM |
216 | static void recent_table_flush(struct recent_table *t) |
217 | { | |
218 | struct recent_entry *e, *next; | |
219 | unsigned int i; | |
1da177e4 | 220 | |
7c4e36bc | 221 | for (i = 0; i < ip_list_hash_size; i++) |
404bdbfd PM |
222 | list_for_each_entry_safe(e, next, &t->iphash[i], list) |
223 | recent_entry_remove(t, e); | |
1da177e4 LT |
224 | } |
225 | ||
1d93a9cb | 226 | static bool |
62fc8051 | 227 | recent_mt(const struct sk_buff *skb, struct xt_action_param *par) |
1da177e4 | 228 | { |
7d07d563 AD |
229 | struct net *net = dev_net(par->in ? par->in : par->out); |
230 | struct recent_net *recent_net = recent_pernet(net); | |
f7108a20 | 231 | const struct xt_recent_mtinfo *info = par->matchinfo; |
404bdbfd PM |
232 | struct recent_table *t; |
233 | struct recent_entry *e; | |
079aa88f | 234 | union nf_inet_addr addr = {}; |
404bdbfd | 235 | u_int8_t ttl; |
1d93a9cb | 236 | bool ret = info->invert; |
1da177e4 | 237 | |
aa5fa318 | 238 | if (par->family == NFPROTO_IPV4) { |
079aa88f JE |
239 | const struct iphdr *iph = ip_hdr(skb); |
240 | ||
241 | if (info->side == XT_RECENT_DEST) | |
242 | addr.ip = iph->daddr; | |
243 | else | |
244 | addr.ip = iph->saddr; | |
245 | ||
246 | ttl = iph->ttl; | |
247 | } else { | |
248 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
249 | ||
250 | if (info->side == XT_RECENT_DEST) | |
251 | memcpy(&addr.in6, &iph->daddr, sizeof(addr.in6)); | |
252 | else | |
253 | memcpy(&addr.in6, &iph->saddr, sizeof(addr.in6)); | |
254 | ||
255 | ttl = iph->hop_limit; | |
256 | } | |
1da177e4 | 257 | |
404bdbfd | 258 | /* use TTL as seen before forwarding */ |
f7108a20 | 259 | if (par->out != NULL && skb->sk == NULL) |
404bdbfd | 260 | ttl++; |
1da177e4 | 261 | |
1da177e4 | 262 | spin_lock_bh(&recent_lock); |
7d07d563 | 263 | t = recent_table_lookup(recent_net, info->name); |
aa5fa318 | 264 | e = recent_entry_lookup(t, &addr, par->family, |
079aa88f | 265 | (info->check_set & XT_RECENT_TTL) ? ttl : 0); |
404bdbfd | 266 | if (e == NULL) { |
e948b20a | 267 | if (!(info->check_set & XT_RECENT_SET)) |
404bdbfd | 268 | goto out; |
aa5fa318 | 269 | e = recent_entry_init(t, &addr, par->family, ttl); |
404bdbfd | 270 | if (e == NULL) |
b4ba2611 | 271 | par->hotdrop = true; |
1d93a9cb | 272 | ret = !ret; |
404bdbfd | 273 | goto out; |
1da177e4 LT |
274 | } |
275 | ||
e948b20a | 276 | if (info->check_set & XT_RECENT_SET) |
1d93a9cb | 277 | ret = !ret; |
e948b20a | 278 | else if (info->check_set & XT_RECENT_REMOVE) { |
404bdbfd | 279 | recent_entry_remove(t, e); |
1d93a9cb | 280 | ret = !ret; |
e948b20a | 281 | } else if (info->check_set & (XT_RECENT_CHECK | XT_RECENT_UPDATE)) { |
855304af | 282 | unsigned long time = jiffies - info->seconds * HZ; |
404bdbfd PM |
283 | unsigned int i, hits = 0; |
284 | ||
285 | for (i = 0; i < e->nstamps; i++) { | |
855304af | 286 | if (info->seconds && time_after(time, e->stamps[i])) |
404bdbfd | 287 | continue; |
ef169150 | 288 | if (!info->hit_count || ++hits >= info->hit_count) { |
1d93a9cb | 289 | ret = !ret; |
404bdbfd | 290 | break; |
1da177e4 | 291 | } |
1da177e4 | 292 | } |
0079c5ae TG |
293 | |
294 | /* info->seconds must be non-zero */ | |
295 | if (info->check_set & XT_RECENT_REAP) | |
296 | recent_entry_reap(t, time); | |
1da177e4 LT |
297 | } |
298 | ||
e948b20a JE |
299 | if (info->check_set & XT_RECENT_SET || |
300 | (info->check_set & XT_RECENT_UPDATE && ret)) { | |
404bdbfd PM |
301 | recent_entry_update(t, e); |
302 | e->ttl = ttl; | |
303 | } | |
304 | out: | |
305 | spin_unlock_bh(&recent_lock); | |
306 | return ret; | |
1da177e4 LT |
307 | } |
308 | ||
b0f38452 | 309 | static int recent_mt_check(const struct xt_mtchk_param *par) |
1da177e4 | 310 | { |
7d07d563 | 311 | struct recent_net *recent_net = recent_pernet(par->net); |
9b4fce7a | 312 | const struct xt_recent_mtinfo *info = par->matchinfo; |
404bdbfd | 313 | struct recent_table *t; |
b0ceb560 AD |
314 | #ifdef CONFIG_PROC_FS |
315 | struct proc_dir_entry *pde; | |
316 | #endif | |
404bdbfd | 317 | unsigned i; |
bd414ee6 | 318 | int ret = -EINVAL; |
1da177e4 | 319 | |
294188ae JE |
320 | if (unlikely(!hash_rnd_inited)) { |
321 | get_random_bytes(&hash_rnd, sizeof(hash_rnd)); | |
322 | hash_rnd_inited = true; | |
323 | } | |
606a9a02 | 324 | if (info->check_set & ~XT_RECENT_VALID_FLAGS) { |
ff67e4e4 JE |
325 | pr_info("Unsupported user space flags (%08x)\n", |
326 | info->check_set); | |
bd414ee6 | 327 | return -EINVAL; |
606a9a02 | 328 | } |
404bdbfd | 329 | if (hweight8(info->check_set & |
e948b20a JE |
330 | (XT_RECENT_SET | XT_RECENT_REMOVE | |
331 | XT_RECENT_CHECK | XT_RECENT_UPDATE)) != 1) | |
bd414ee6 | 332 | return -EINVAL; |
e948b20a | 333 | if ((info->check_set & (XT_RECENT_SET | XT_RECENT_REMOVE)) && |
0079c5ae TG |
334 | (info->seconds || info->hit_count || |
335 | (info->check_set & XT_RECENT_MODIFIERS))) | |
bd414ee6 | 336 | return -EINVAL; |
0079c5ae | 337 | if ((info->check_set & XT_RECENT_REAP) && !info->seconds) |
bd414ee6 | 338 | return -EINVAL; |
98e6d2d5 | 339 | if (info->hit_count > ip_pkt_list_tot) { |
ff67e4e4 | 340 | pr_info("hitcount (%u) is larger than " |
98e6d2d5 JE |
341 | "packets to be remembered (%u)\n", |
342 | info->hit_count, ip_pkt_list_tot); | |
bd414ee6 | 343 | return -EINVAL; |
98e6d2d5 | 344 | } |
404bdbfd | 345 | if (info->name[0] == '\0' || |
e948b20a | 346 | strnlen(info->name, XT_RECENT_NAME_LEN) == XT_RECENT_NAME_LEN) |
bd414ee6 | 347 | return -EINVAL; |
1da177e4 | 348 | |
a0e889bb | 349 | mutex_lock(&recent_mutex); |
7d07d563 | 350 | t = recent_table_lookup(recent_net, info->name); |
404bdbfd PM |
351 | if (t != NULL) { |
352 | t->refcnt++; | |
bd414ee6 | 353 | ret = 0; |
404bdbfd | 354 | goto out; |
1da177e4 LT |
355 | } |
356 | ||
404bdbfd | 357 | t = kzalloc(sizeof(*t) + sizeof(t->iphash[0]) * ip_list_hash_size, |
a0e889bb | 358 | GFP_KERNEL); |
4a5a5c73 JE |
359 | if (t == NULL) { |
360 | ret = -ENOMEM; | |
404bdbfd | 361 | goto out; |
4a5a5c73 | 362 | } |
2b2283d0 | 363 | t->refcnt = 1; |
404bdbfd PM |
364 | strcpy(t->name, info->name); |
365 | INIT_LIST_HEAD(&t->lru_list); | |
366 | for (i = 0; i < ip_list_hash_size; i++) | |
367 | INIT_LIST_HEAD(&t->iphash[i]); | |
368 | #ifdef CONFIG_PROC_FS | |
7d07d563 | 369 | pde = proc_create_data(t->name, ip_list_perms, recent_net->xt_recent, |
b09eec16 | 370 | &recent_mt_fops, t); |
b0ceb560 | 371 | if (pde == NULL) { |
404bdbfd | 372 | kfree(t); |
4a5a5c73 | 373 | ret = -ENOMEM; |
404bdbfd | 374 | goto out; |
1da177e4 | 375 | } |
b0ceb560 AD |
376 | pde->uid = ip_list_uid; |
377 | pde->gid = ip_list_gid; | |
1da177e4 | 378 | #endif |
a0e889bb | 379 | spin_lock_bh(&recent_lock); |
7d07d563 | 380 | list_add_tail(&t->list, &recent_net->tables); |
a0e889bb | 381 | spin_unlock_bh(&recent_lock); |
bd414ee6 | 382 | ret = 0; |
404bdbfd | 383 | out: |
a0e889bb | 384 | mutex_unlock(&recent_mutex); |
404bdbfd PM |
385 | return ret; |
386 | } | |
1da177e4 | 387 | |
6be3d859 | 388 | static void recent_mt_destroy(const struct xt_mtdtor_param *par) |
404bdbfd | 389 | { |
7d07d563 | 390 | struct recent_net *recent_net = recent_pernet(par->net); |
6be3d859 | 391 | const struct xt_recent_mtinfo *info = par->matchinfo; |
404bdbfd | 392 | struct recent_table *t; |
1da177e4 | 393 | |
a0e889bb | 394 | mutex_lock(&recent_mutex); |
7d07d563 | 395 | t = recent_table_lookup(recent_net, info->name); |
404bdbfd | 396 | if (--t->refcnt == 0) { |
a0e889bb | 397 | spin_lock_bh(&recent_lock); |
404bdbfd | 398 | list_del(&t->list); |
a0e889bb | 399 | spin_unlock_bh(&recent_lock); |
404bdbfd | 400 | #ifdef CONFIG_PROC_FS |
7d07d563 | 401 | remove_proc_entry(t->name, recent_net->xt_recent); |
1da177e4 | 402 | #endif |
a8ddc916 | 403 | recent_table_flush(t); |
404bdbfd | 404 | kfree(t); |
1da177e4 | 405 | } |
a0e889bb | 406 | mutex_unlock(&recent_mutex); |
404bdbfd | 407 | } |
1da177e4 | 408 | |
404bdbfd PM |
409 | #ifdef CONFIG_PROC_FS |
410 | struct recent_iter_state { | |
079aa88f | 411 | const struct recent_table *table; |
404bdbfd PM |
412 | unsigned int bucket; |
413 | }; | |
1da177e4 | 414 | |
404bdbfd | 415 | static void *recent_seq_start(struct seq_file *seq, loff_t *pos) |
855304af | 416 | __acquires(recent_lock) |
404bdbfd PM |
417 | { |
418 | struct recent_iter_state *st = seq->private; | |
a47362a2 | 419 | const struct recent_table *t = st->table; |
404bdbfd PM |
420 | struct recent_entry *e; |
421 | loff_t p = *pos; | |
1da177e4 | 422 | |
1da177e4 | 423 | spin_lock_bh(&recent_lock); |
1da177e4 | 424 | |
7c4e36bc JE |
425 | for (st->bucket = 0; st->bucket < ip_list_hash_size; st->bucket++) |
426 | list_for_each_entry(e, &t->iphash[st->bucket], list) | |
404bdbfd PM |
427 | if (p-- == 0) |
428 | return e; | |
404bdbfd PM |
429 | return NULL; |
430 | } | |
1da177e4 | 431 | |
404bdbfd PM |
432 | static void *recent_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
433 | { | |
434 | struct recent_iter_state *st = seq->private; | |
3cf93c96 | 435 | const struct recent_table *t = st->table; |
079aa88f JE |
436 | const struct recent_entry *e = v; |
437 | const struct list_head *head = e->list.next; | |
404bdbfd PM |
438 | |
439 | while (head == &t->iphash[st->bucket]) { | |
440 | if (++st->bucket >= ip_list_hash_size) | |
441 | return NULL; | |
442 | head = t->iphash[st->bucket].next; | |
443 | } | |
444 | (*pos)++; | |
445 | return list_entry(head, struct recent_entry, list); | |
1da177e4 LT |
446 | } |
447 | ||
404bdbfd | 448 | static void recent_seq_stop(struct seq_file *s, void *v) |
855304af | 449 | __releases(recent_lock) |
1da177e4 | 450 | { |
404bdbfd PM |
451 | spin_unlock_bh(&recent_lock); |
452 | } | |
1da177e4 | 453 | |
404bdbfd PM |
454 | static int recent_seq_show(struct seq_file *seq, void *v) |
455 | { | |
3cf93c96 | 456 | const struct recent_entry *e = v; |
404bdbfd PM |
457 | unsigned int i; |
458 | ||
459 | i = (e->index - 1) % ip_pkt_list_tot; | |
ee999d8b | 460 | if (e->family == NFPROTO_IPV4) |
14d5e834 HH |
461 | seq_printf(seq, "src=%pI4 ttl: %u last_seen: %lu oldest_pkt: %u", |
462 | &e->addr.ip, e->ttl, e->stamps[i], e->index); | |
079aa88f | 463 | else |
5b095d98 | 464 | seq_printf(seq, "src=%pI6 ttl: %u last_seen: %lu oldest_pkt: %u", |
38ff4fa4 | 465 | &e->addr.in6, e->ttl, e->stamps[i], e->index); |
404bdbfd PM |
466 | for (i = 0; i < e->nstamps; i++) |
467 | seq_printf(seq, "%s %lu", i ? "," : "", e->stamps[i]); | |
468 | seq_printf(seq, "\n"); | |
469 | return 0; | |
470 | } | |
1da177e4 | 471 | |
56b3d975 | 472 | static const struct seq_operations recent_seq_ops = { |
404bdbfd PM |
473 | .start = recent_seq_start, |
474 | .next = recent_seq_next, | |
475 | .stop = recent_seq_stop, | |
476 | .show = recent_seq_show, | |
477 | }; | |
1da177e4 | 478 | |
404bdbfd PM |
479 | static int recent_seq_open(struct inode *inode, struct file *file) |
480 | { | |
481 | struct proc_dir_entry *pde = PDE(inode); | |
404bdbfd | 482 | struct recent_iter_state *st; |
404bdbfd | 483 | |
e2da5913 | 484 | st = __seq_open_private(file, &recent_seq_ops, sizeof(*st)); |
404bdbfd PM |
485 | if (st == NULL) |
486 | return -ENOMEM; | |
3af8e31c | 487 | |
404bdbfd | 488 | st->table = pde->data; |
e2da5913 | 489 | return 0; |
404bdbfd | 490 | } |
1da177e4 | 491 | |
079aa88f JE |
492 | static ssize_t |
493 | recent_mt_proc_write(struct file *file, const char __user *input, | |
494 | size_t size, loff_t *loff) | |
495 | { | |
496 | const struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode); | |
497 | struct recent_table *t = pde->data; | |
498 | struct recent_entry *e; | |
499 | char buf[sizeof("+b335:1d35:1e55:dead:c0de:1715:5afe:c0de")]; | |
500 | const char *c = buf; | |
325fb5b4 | 501 | union nf_inet_addr addr = {}; |
079aa88f JE |
502 | u_int16_t family; |
503 | bool add, succ; | |
504 | ||
505 | if (size == 0) | |
506 | return 0; | |
507 | if (size > sizeof(buf)) | |
508 | size = sizeof(buf); | |
509 | if (copy_from_user(buf, input, size) != 0) | |
510 | return -EFAULT; | |
511 | ||
512 | /* Strict protocol! */ | |
513 | if (*loff != 0) | |
514 | return -ESPIPE; | |
515 | switch (*c) { | |
516 | case '/': /* flush table */ | |
517 | spin_lock_bh(&recent_lock); | |
518 | recent_table_flush(t); | |
519 | spin_unlock_bh(&recent_lock); | |
520 | return size; | |
521 | case '-': /* remove address */ | |
522 | add = false; | |
523 | break; | |
524 | case '+': /* add address */ | |
525 | add = true; | |
526 | break; | |
527 | default: | |
8bee4bad | 528 | pr_info("Need \"+ip\", \"-ip\" or \"/\"\n"); |
079aa88f JE |
529 | return -EINVAL; |
530 | } | |
531 | ||
532 | ++c; | |
533 | --size; | |
534 | if (strnchr(c, size, ':') != NULL) { | |
ee999d8b | 535 | family = NFPROTO_IPV6; |
079aa88f JE |
536 | succ = in6_pton(c, size, (void *)&addr, '\n', NULL); |
537 | } else { | |
ee999d8b | 538 | family = NFPROTO_IPV4; |
079aa88f JE |
539 | succ = in4_pton(c, size, (void *)&addr, '\n', NULL); |
540 | } | |
541 | ||
542 | if (!succ) { | |
8bee4bad | 543 | pr_info("illegal address written to procfs\n"); |
079aa88f JE |
544 | return -EINVAL; |
545 | } | |
546 | ||
547 | spin_lock_bh(&recent_lock); | |
548 | e = recent_entry_lookup(t, &addr, family, 0); | |
549 | if (e == NULL) { | |
550 | if (add) | |
551 | recent_entry_init(t, &addr, family, 0); | |
552 | } else { | |
553 | if (add) | |
554 | recent_entry_update(t, e); | |
555 | else | |
556 | recent_entry_remove(t, e); | |
557 | } | |
558 | spin_unlock_bh(&recent_lock); | |
559 | /* Note we removed one above */ | |
560 | *loff += size + 1; | |
561 | return size + 1; | |
562 | } | |
563 | ||
564 | static const struct file_operations recent_mt_fops = { | |
565 | .open = recent_seq_open, | |
566 | .read = seq_read, | |
567 | .write = recent_mt_proc_write, | |
568 | .release = seq_release_private, | |
569 | .owner = THIS_MODULE, | |
6038f373 | 570 | .llseek = seq_lseek, |
079aa88f | 571 | }; |
7d07d563 AD |
572 | |
573 | static int __net_init recent_proc_net_init(struct net *net) | |
574 | { | |
575 | struct recent_net *recent_net = recent_pernet(net); | |
576 | ||
577 | recent_net->xt_recent = proc_mkdir("xt_recent", net->proc_net); | |
578 | if (!recent_net->xt_recent) | |
579 | return -ENOMEM; | |
7d07d563 AD |
580 | return 0; |
581 | } | |
582 | ||
583 | static void __net_exit recent_proc_net_exit(struct net *net) | |
584 | { | |
7d07d563 AD |
585 | proc_net_remove(net, "xt_recent"); |
586 | } | |
587 | #else | |
588 | static inline int recent_proc_net_init(struct net *net) | |
589 | { | |
590 | return 0; | |
591 | } | |
592 | ||
593 | static inline void recent_proc_net_exit(struct net *net) | |
594 | { | |
595 | } | |
1da177e4 | 596 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 597 | |
7d07d563 AD |
598 | static int __net_init recent_net_init(struct net *net) |
599 | { | |
600 | struct recent_net *recent_net = recent_pernet(net); | |
601 | ||
602 | INIT_LIST_HEAD(&recent_net->tables); | |
603 | return recent_proc_net_init(net); | |
604 | } | |
605 | ||
606 | static void __net_exit recent_net_exit(struct net *net) | |
607 | { | |
608 | struct recent_net *recent_net = recent_pernet(net); | |
609 | ||
610 | BUG_ON(!list_empty(&recent_net->tables)); | |
611 | recent_proc_net_exit(net); | |
612 | } | |
613 | ||
614 | static struct pernet_operations recent_net_ops = { | |
615 | .init = recent_net_init, | |
616 | .exit = recent_net_exit, | |
617 | .id = &recent_net_id, | |
618 | .size = sizeof(struct recent_net), | |
619 | }; | |
620 | ||
079aa88f JE |
621 | static struct xt_match recent_mt_reg[] __read_mostly = { |
622 | { | |
623 | .name = "recent", | |
624 | .revision = 0, | |
ee999d8b | 625 | .family = NFPROTO_IPV4, |
079aa88f JE |
626 | .match = recent_mt, |
627 | .matchsize = sizeof(struct xt_recent_mtinfo), | |
628 | .checkentry = recent_mt_check, | |
629 | .destroy = recent_mt_destroy, | |
630 | .me = THIS_MODULE, | |
631 | }, | |
632 | { | |
633 | .name = "recent", | |
634 | .revision = 0, | |
ee999d8b | 635 | .family = NFPROTO_IPV6, |
079aa88f JE |
636 | .match = recent_mt, |
637 | .matchsize = sizeof(struct xt_recent_mtinfo), | |
638 | .checkentry = recent_mt_check, | |
639 | .destroy = recent_mt_destroy, | |
640 | .me = THIS_MODULE, | |
641 | }, | |
1da177e4 LT |
642 | }; |
643 | ||
d3c5ee6d | 644 | static int __init recent_mt_init(void) |
1da177e4 | 645 | { |
404bdbfd | 646 | int err; |
1da177e4 | 647 | |
404bdbfd PM |
648 | if (!ip_list_tot || !ip_pkt_list_tot || ip_pkt_list_tot > 255) |
649 | return -EINVAL; | |
650 | ip_list_hash_size = 1 << fls(ip_list_tot); | |
1da177e4 | 651 | |
7d07d563 | 652 | err = register_pernet_subsys(&recent_net_ops); |
1da177e4 | 653 | if (err) |
404bdbfd | 654 | return err; |
7d07d563 AD |
655 | err = xt_register_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg)); |
656 | if (err) | |
657 | unregister_pernet_subsys(&recent_net_ops); | |
1da177e4 LT |
658 | return err; |
659 | } | |
660 | ||
d3c5ee6d | 661 | static void __exit recent_mt_exit(void) |
1da177e4 | 662 | { |
079aa88f | 663 | xt_unregister_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg)); |
7d07d563 | 664 | unregister_pernet_subsys(&recent_net_ops); |
1da177e4 LT |
665 | } |
666 | ||
d3c5ee6d JE |
667 | module_init(recent_mt_init); |
668 | module_exit(recent_mt_exit); |