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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> | |
5a0e3ad6 | 30 | #include <linux/slab.h> |
457c4cbc | 31 | #include <net/net_namespace.h> |
7d07d563 | 32 | #include <net/netns/generic.h> |
1da177e4 | 33 | |
6709dbbb | 34 | #include <linux/netfilter/x_tables.h> |
e948b20a | 35 | #include <linux/netfilter/xt_recent.h> |
1da177e4 | 36 | |
404bdbfd | 37 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
079aa88f | 38 | MODULE_AUTHOR("Jan Engelhardt <jengelh@computergmbh.de>"); |
2ae15b64 | 39 | MODULE_DESCRIPTION("Xtables: \"recently-seen\" host matching for IPv4"); |
404bdbfd | 40 | MODULE_LICENSE("GPL"); |
e948b20a | 41 | MODULE_ALIAS("ipt_recent"); |
079aa88f | 42 | MODULE_ALIAS("ip6t_recent"); |
1da177e4 | 43 | |
e7be6994 PM |
44 | static unsigned int ip_list_tot = 100; |
45 | static unsigned int ip_pkt_list_tot = 20; | |
46 | static unsigned int ip_list_hash_size = 0; | |
47 | static unsigned int ip_list_perms = 0644; | |
b93ff783 DDG |
48 | static unsigned int ip_list_uid = 0; |
49 | static unsigned int ip_list_gid = 0; | |
e7be6994 PM |
50 | module_param(ip_list_tot, uint, 0400); |
51 | module_param(ip_pkt_list_tot, uint, 0400); | |
52 | module_param(ip_list_hash_size, uint, 0400); | |
53 | module_param(ip_list_perms, uint, 0400); | |
b93ff783 DDG |
54 | module_param(ip_list_uid, uint, 0400); |
55 | module_param(ip_list_gid, uint, 0400); | |
404bdbfd | 56 | MODULE_PARM_DESC(ip_list_tot, "number of IPs to remember per list"); |
98e6d2d5 | 57 | MODULE_PARM_DESC(ip_pkt_list_tot, "number of packets per IP address to remember (max. 255)"); |
404bdbfd | 58 | MODULE_PARM_DESC(ip_list_hash_size, "size of hash table used to look up IPs"); |
079aa88f JE |
59 | MODULE_PARM_DESC(ip_list_perms, "permissions on /proc/net/xt_recent/* files"); |
60 | MODULE_PARM_DESC(ip_list_uid,"owner of /proc/net/xt_recent/* files"); | |
61 | MODULE_PARM_DESC(ip_list_gid,"owning group of /proc/net/xt_recent/* files"); | |
404bdbfd | 62 | |
404bdbfd PM |
63 | struct recent_entry { |
64 | struct list_head list; | |
65 | struct list_head lru_list; | |
079aa88f JE |
66 | union nf_inet_addr addr; |
67 | u_int16_t family; | |
404bdbfd PM |
68 | u_int8_t ttl; |
69 | u_int8_t index; | |
70 | u_int16_t nstamps; | |
71 | unsigned long stamps[0]; | |
1da177e4 LT |
72 | }; |
73 | ||
404bdbfd PM |
74 | struct recent_table { |
75 | struct list_head list; | |
e948b20a | 76 | char name[XT_RECENT_NAME_LEN]; |
404bdbfd PM |
77 | unsigned int refcnt; |
78 | unsigned int entries; | |
79 | struct list_head lru_list; | |
80 | struct list_head iphash[0]; | |
1da177e4 LT |
81 | }; |
82 | ||
7d07d563 AD |
83 | struct recent_net { |
84 | struct list_head tables; | |
85 | #ifdef CONFIG_PROC_FS | |
86 | struct proc_dir_entry *xt_recent; | |
87 | #ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT | |
88 | struct proc_dir_entry *ipt_recent; | |
89 | #endif | |
90 | #endif | |
91 | }; | |
92 | ||
93 | static int recent_net_id; | |
94 | static inline struct recent_net *recent_pernet(struct net *net) | |
95 | { | |
96 | return net_generic(net, recent_net_id); | |
97 | } | |
98 | ||
1da177e4 | 99 | static DEFINE_SPINLOCK(recent_lock); |
a0e889bb | 100 | static DEFINE_MUTEX(recent_mutex); |
1da177e4 LT |
101 | |
102 | #ifdef CONFIG_PROC_FS | |
079aa88f | 103 | static const struct file_operations recent_old_fops, recent_mt_fops; |
1da177e4 LT |
104 | #endif |
105 | ||
294188ae JE |
106 | static u_int32_t hash_rnd __read_mostly; |
107 | static bool hash_rnd_inited __read_mostly; | |
079aa88f | 108 | |
294188ae | 109 | static inline unsigned int recent_entry_hash4(const union nf_inet_addr *addr) |
079aa88f | 110 | { |
079aa88f JE |
111 | return jhash_1word((__force u32)addr->ip, hash_rnd) & |
112 | (ip_list_hash_size - 1); | |
113 | } | |
1da177e4 | 114 | |
294188ae | 115 | static inline unsigned int recent_entry_hash6(const union nf_inet_addr *addr) |
1da177e4 | 116 | { |
079aa88f JE |
117 | return jhash2((u32 *)addr->ip6, ARRAY_SIZE(addr->ip6), hash_rnd) & |
118 | (ip_list_hash_size - 1); | |
1da177e4 LT |
119 | } |
120 | ||
404bdbfd | 121 | static struct recent_entry * |
079aa88f JE |
122 | recent_entry_lookup(const struct recent_table *table, |
123 | const union nf_inet_addr *addrp, u_int16_t family, | |
124 | u_int8_t ttl) | |
1da177e4 | 125 | { |
404bdbfd PM |
126 | struct recent_entry *e; |
127 | unsigned int h; | |
128 | ||
ee999d8b | 129 | if (family == NFPROTO_IPV4) |
079aa88f JE |
130 | h = recent_entry_hash4(addrp); |
131 | else | |
132 | h = recent_entry_hash6(addrp); | |
133 | ||
404bdbfd | 134 | list_for_each_entry(e, &table->iphash[h], list) |
079aa88f JE |
135 | if (e->family == family && |
136 | memcmp(&e->addr, addrp, sizeof(e->addr)) == 0 && | |
137 | (ttl == e->ttl || ttl == 0 || e->ttl == 0)) | |
404bdbfd PM |
138 | return e; |
139 | return NULL; | |
140 | } | |
1da177e4 | 141 | |
404bdbfd PM |
142 | static void recent_entry_remove(struct recent_table *t, struct recent_entry *e) |
143 | { | |
144 | list_del(&e->list); | |
145 | list_del(&e->lru_list); | |
146 | kfree(e); | |
147 | t->entries--; | |
148 | } | |
1da177e4 | 149 | |
404bdbfd | 150 | static struct recent_entry * |
079aa88f JE |
151 | recent_entry_init(struct recent_table *t, const union nf_inet_addr *addr, |
152 | u_int16_t family, u_int8_t ttl) | |
404bdbfd PM |
153 | { |
154 | struct recent_entry *e; | |
1da177e4 | 155 | |
404bdbfd PM |
156 | if (t->entries >= ip_list_tot) { |
157 | e = list_entry(t->lru_list.next, struct recent_entry, lru_list); | |
158 | recent_entry_remove(t, e); | |
1da177e4 | 159 | } |
404bdbfd PM |
160 | e = kmalloc(sizeof(*e) + sizeof(e->stamps[0]) * ip_pkt_list_tot, |
161 | GFP_ATOMIC); | |
162 | if (e == NULL) | |
163 | return NULL; | |
079aa88f | 164 | memcpy(&e->addr, addr, sizeof(e->addr)); |
404bdbfd PM |
165 | e->ttl = ttl; |
166 | e->stamps[0] = jiffies; | |
167 | e->nstamps = 1; | |
168 | e->index = 1; | |
079aa88f | 169 | e->family = family; |
ee999d8b | 170 | if (family == NFPROTO_IPV4) |
079aa88f JE |
171 | list_add_tail(&e->list, &t->iphash[recent_entry_hash4(addr)]); |
172 | else | |
173 | list_add_tail(&e->list, &t->iphash[recent_entry_hash6(addr)]); | |
404bdbfd PM |
174 | list_add_tail(&e->lru_list, &t->lru_list); |
175 | t->entries++; | |
176 | return e; | |
177 | } | |
1da177e4 | 178 | |
404bdbfd PM |
179 | static void recent_entry_update(struct recent_table *t, struct recent_entry *e) |
180 | { | |
2c08522e | 181 | e->index %= ip_pkt_list_tot; |
404bdbfd PM |
182 | e->stamps[e->index++] = jiffies; |
183 | if (e->index > e->nstamps) | |
184 | e->nstamps = e->index; | |
404bdbfd PM |
185 | list_move_tail(&e->lru_list, &t->lru_list); |
186 | } | |
1da177e4 | 187 | |
7d07d563 AD |
188 | static struct recent_table *recent_table_lookup(struct recent_net *recent_net, |
189 | const char *name) | |
404bdbfd PM |
190 | { |
191 | struct recent_table *t; | |
1da177e4 | 192 | |
7d07d563 | 193 | list_for_each_entry(t, &recent_net->tables, list) |
404bdbfd PM |
194 | if (!strcmp(t->name, name)) |
195 | return t; | |
196 | return NULL; | |
197 | } | |
1da177e4 | 198 | |
404bdbfd PM |
199 | static void recent_table_flush(struct recent_table *t) |
200 | { | |
201 | struct recent_entry *e, *next; | |
202 | unsigned int i; | |
1da177e4 | 203 | |
7c4e36bc | 204 | for (i = 0; i < ip_list_hash_size; i++) |
404bdbfd PM |
205 | list_for_each_entry_safe(e, next, &t->iphash[i], list) |
206 | recent_entry_remove(t, e); | |
1da177e4 LT |
207 | } |
208 | ||
1d93a9cb | 209 | static bool |
f7108a20 | 210 | recent_mt(const struct sk_buff *skb, const struct xt_match_param *par) |
1da177e4 | 211 | { |
7d07d563 AD |
212 | struct net *net = dev_net(par->in ? par->in : par->out); |
213 | struct recent_net *recent_net = recent_pernet(net); | |
f7108a20 | 214 | const struct xt_recent_mtinfo *info = par->matchinfo; |
404bdbfd PM |
215 | struct recent_table *t; |
216 | struct recent_entry *e; | |
079aa88f | 217 | union nf_inet_addr addr = {}; |
404bdbfd | 218 | u_int8_t ttl; |
1d93a9cb | 219 | bool ret = info->invert; |
1da177e4 | 220 | |
f7108a20 | 221 | if (par->match->family == NFPROTO_IPV4) { |
079aa88f JE |
222 | const struct iphdr *iph = ip_hdr(skb); |
223 | ||
224 | if (info->side == XT_RECENT_DEST) | |
225 | addr.ip = iph->daddr; | |
226 | else | |
227 | addr.ip = iph->saddr; | |
228 | ||
229 | ttl = iph->ttl; | |
230 | } else { | |
231 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
232 | ||
233 | if (info->side == XT_RECENT_DEST) | |
234 | memcpy(&addr.in6, &iph->daddr, sizeof(addr.in6)); | |
235 | else | |
236 | memcpy(&addr.in6, &iph->saddr, sizeof(addr.in6)); | |
237 | ||
238 | ttl = iph->hop_limit; | |
239 | } | |
1da177e4 | 240 | |
404bdbfd | 241 | /* use TTL as seen before forwarding */ |
f7108a20 | 242 | if (par->out != NULL && skb->sk == NULL) |
404bdbfd | 243 | ttl++; |
1da177e4 | 244 | |
1da177e4 | 245 | spin_lock_bh(&recent_lock); |
7d07d563 | 246 | t = recent_table_lookup(recent_net, info->name); |
f7108a20 | 247 | e = recent_entry_lookup(t, &addr, par->match->family, |
079aa88f | 248 | (info->check_set & XT_RECENT_TTL) ? ttl : 0); |
404bdbfd | 249 | if (e == NULL) { |
e948b20a | 250 | if (!(info->check_set & XT_RECENT_SET)) |
404bdbfd | 251 | goto out; |
f7108a20 | 252 | e = recent_entry_init(t, &addr, par->match->family, ttl); |
404bdbfd | 253 | if (e == NULL) |
f7108a20 | 254 | *par->hotdrop = true; |
1d93a9cb | 255 | ret = !ret; |
404bdbfd | 256 | goto out; |
1da177e4 LT |
257 | } |
258 | ||
e948b20a | 259 | if (info->check_set & XT_RECENT_SET) |
1d93a9cb | 260 | ret = !ret; |
e948b20a | 261 | else if (info->check_set & XT_RECENT_REMOVE) { |
404bdbfd | 262 | recent_entry_remove(t, e); |
1d93a9cb | 263 | ret = !ret; |
e948b20a | 264 | } else if (info->check_set & (XT_RECENT_CHECK | XT_RECENT_UPDATE)) { |
855304af | 265 | unsigned long time = jiffies - info->seconds * HZ; |
404bdbfd PM |
266 | unsigned int i, hits = 0; |
267 | ||
268 | for (i = 0; i < e->nstamps; i++) { | |
855304af | 269 | if (info->seconds && time_after(time, e->stamps[i])) |
404bdbfd | 270 | continue; |
ef169150 | 271 | if (!info->hit_count || ++hits >= info->hit_count) { |
1d93a9cb | 272 | ret = !ret; |
404bdbfd | 273 | break; |
1da177e4 | 274 | } |
1da177e4 | 275 | } |
1da177e4 LT |
276 | } |
277 | ||
e948b20a JE |
278 | if (info->check_set & XT_RECENT_SET || |
279 | (info->check_set & XT_RECENT_UPDATE && ret)) { | |
404bdbfd PM |
280 | recent_entry_update(t, e); |
281 | e->ttl = ttl; | |
282 | } | |
283 | out: | |
284 | spin_unlock_bh(&recent_lock); | |
285 | return ret; | |
1da177e4 LT |
286 | } |
287 | ||
9b4fce7a | 288 | static bool recent_mt_check(const struct xt_mtchk_param *par) |
1da177e4 | 289 | { |
7d07d563 | 290 | struct recent_net *recent_net = recent_pernet(par->net); |
9b4fce7a | 291 | const struct xt_recent_mtinfo *info = par->matchinfo; |
404bdbfd | 292 | struct recent_table *t; |
b0ceb560 AD |
293 | #ifdef CONFIG_PROC_FS |
294 | struct proc_dir_entry *pde; | |
295 | #endif | |
404bdbfd | 296 | unsigned i; |
ccb79bdc | 297 | bool ret = false; |
1da177e4 | 298 | |
294188ae JE |
299 | if (unlikely(!hash_rnd_inited)) { |
300 | get_random_bytes(&hash_rnd, sizeof(hash_rnd)); | |
301 | hash_rnd_inited = true; | |
302 | } | |
404bdbfd | 303 | if (hweight8(info->check_set & |
e948b20a JE |
304 | (XT_RECENT_SET | XT_RECENT_REMOVE | |
305 | XT_RECENT_CHECK | XT_RECENT_UPDATE)) != 1) | |
ccb79bdc | 306 | return false; |
e948b20a | 307 | if ((info->check_set & (XT_RECENT_SET | XT_RECENT_REMOVE)) && |
404bdbfd | 308 | (info->seconds || info->hit_count)) |
ccb79bdc | 309 | return false; |
98e6d2d5 JE |
310 | if (info->hit_count > ip_pkt_list_tot) { |
311 | pr_info(KBUILD_MODNAME ": hitcount (%u) is larger than " | |
312 | "packets to be remembered (%u)\n", | |
313 | info->hit_count, ip_pkt_list_tot); | |
d0ebf133 | 314 | return false; |
98e6d2d5 | 315 | } |
404bdbfd | 316 | if (info->name[0] == '\0' || |
e948b20a | 317 | strnlen(info->name, XT_RECENT_NAME_LEN) == XT_RECENT_NAME_LEN) |
ccb79bdc | 318 | return false; |
1da177e4 | 319 | |
a0e889bb | 320 | mutex_lock(&recent_mutex); |
7d07d563 | 321 | t = recent_table_lookup(recent_net, info->name); |
404bdbfd PM |
322 | if (t != NULL) { |
323 | t->refcnt++; | |
ccb79bdc | 324 | ret = true; |
404bdbfd | 325 | goto out; |
1da177e4 LT |
326 | } |
327 | ||
404bdbfd | 328 | t = kzalloc(sizeof(*t) + sizeof(t->iphash[0]) * ip_list_hash_size, |
a0e889bb | 329 | GFP_KERNEL); |
404bdbfd PM |
330 | if (t == NULL) |
331 | goto out; | |
2b2283d0 | 332 | t->refcnt = 1; |
404bdbfd PM |
333 | strcpy(t->name, info->name); |
334 | INIT_LIST_HEAD(&t->lru_list); | |
335 | for (i = 0; i < ip_list_hash_size; i++) | |
336 | INIT_LIST_HEAD(&t->iphash[i]); | |
337 | #ifdef CONFIG_PROC_FS | |
7d07d563 | 338 | pde = proc_create_data(t->name, ip_list_perms, recent_net->xt_recent, |
b09eec16 | 339 | &recent_mt_fops, t); |
b0ceb560 | 340 | if (pde == NULL) { |
404bdbfd PM |
341 | kfree(t); |
342 | goto out; | |
1da177e4 | 343 | } |
b0ceb560 AD |
344 | pde->uid = ip_list_uid; |
345 | pde->gid = ip_list_gid; | |
079aa88f | 346 | #ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT |
7d07d563 | 347 | pde = proc_create_data(t->name, ip_list_perms, recent_net->ipt_recent, |
b09eec16 | 348 | &recent_old_fops, t); |
b0ceb560 | 349 | if (pde == NULL) { |
7d07d563 | 350 | remove_proc_entry(t->name, recent_net->xt_recent); |
079aa88f JE |
351 | kfree(t); |
352 | goto out; | |
353 | } | |
b0ceb560 AD |
354 | pde->uid = ip_list_uid; |
355 | pde->gid = ip_list_gid; | |
079aa88f | 356 | #endif |
1da177e4 | 357 | #endif |
a0e889bb | 358 | spin_lock_bh(&recent_lock); |
7d07d563 | 359 | list_add_tail(&t->list, &recent_net->tables); |
a0e889bb | 360 | spin_unlock_bh(&recent_lock); |
ccb79bdc | 361 | ret = true; |
404bdbfd | 362 | out: |
a0e889bb | 363 | mutex_unlock(&recent_mutex); |
404bdbfd PM |
364 | return ret; |
365 | } | |
1da177e4 | 366 | |
6be3d859 | 367 | static void recent_mt_destroy(const struct xt_mtdtor_param *par) |
404bdbfd | 368 | { |
7d07d563 | 369 | struct recent_net *recent_net = recent_pernet(par->net); |
6be3d859 | 370 | const struct xt_recent_mtinfo *info = par->matchinfo; |
404bdbfd | 371 | struct recent_table *t; |
1da177e4 | 372 | |
a0e889bb | 373 | mutex_lock(&recent_mutex); |
7d07d563 | 374 | t = recent_table_lookup(recent_net, info->name); |
404bdbfd | 375 | if (--t->refcnt == 0) { |
a0e889bb | 376 | spin_lock_bh(&recent_lock); |
404bdbfd | 377 | list_del(&t->list); |
a0e889bb | 378 | spin_unlock_bh(&recent_lock); |
404bdbfd | 379 | #ifdef CONFIG_PROC_FS |
079aa88f | 380 | #ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT |
7d07d563 | 381 | remove_proc_entry(t->name, recent_net->ipt_recent); |
079aa88f | 382 | #endif |
7d07d563 | 383 | remove_proc_entry(t->name, recent_net->xt_recent); |
1da177e4 | 384 | #endif |
a8ddc916 | 385 | recent_table_flush(t); |
404bdbfd | 386 | kfree(t); |
1da177e4 | 387 | } |
a0e889bb | 388 | mutex_unlock(&recent_mutex); |
404bdbfd | 389 | } |
1da177e4 | 390 | |
404bdbfd PM |
391 | #ifdef CONFIG_PROC_FS |
392 | struct recent_iter_state { | |
079aa88f | 393 | const struct recent_table *table; |
404bdbfd PM |
394 | unsigned int bucket; |
395 | }; | |
1da177e4 | 396 | |
404bdbfd | 397 | static void *recent_seq_start(struct seq_file *seq, loff_t *pos) |
855304af | 398 | __acquires(recent_lock) |
404bdbfd PM |
399 | { |
400 | struct recent_iter_state *st = seq->private; | |
a47362a2 | 401 | const struct recent_table *t = st->table; |
404bdbfd PM |
402 | struct recent_entry *e; |
403 | loff_t p = *pos; | |
1da177e4 | 404 | |
1da177e4 | 405 | spin_lock_bh(&recent_lock); |
1da177e4 | 406 | |
7c4e36bc JE |
407 | for (st->bucket = 0; st->bucket < ip_list_hash_size; st->bucket++) |
408 | list_for_each_entry(e, &t->iphash[st->bucket], list) | |
404bdbfd PM |
409 | if (p-- == 0) |
410 | return e; | |
404bdbfd PM |
411 | return NULL; |
412 | } | |
1da177e4 | 413 | |
404bdbfd PM |
414 | static void *recent_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
415 | { | |
416 | struct recent_iter_state *st = seq->private; | |
3cf93c96 | 417 | const struct recent_table *t = st->table; |
079aa88f JE |
418 | const struct recent_entry *e = v; |
419 | const struct list_head *head = e->list.next; | |
404bdbfd PM |
420 | |
421 | while (head == &t->iphash[st->bucket]) { | |
422 | if (++st->bucket >= ip_list_hash_size) | |
423 | return NULL; | |
424 | head = t->iphash[st->bucket].next; | |
425 | } | |
426 | (*pos)++; | |
427 | return list_entry(head, struct recent_entry, list); | |
1da177e4 LT |
428 | } |
429 | ||
404bdbfd | 430 | static void recent_seq_stop(struct seq_file *s, void *v) |
855304af | 431 | __releases(recent_lock) |
1da177e4 | 432 | { |
404bdbfd PM |
433 | spin_unlock_bh(&recent_lock); |
434 | } | |
1da177e4 | 435 | |
404bdbfd PM |
436 | static int recent_seq_show(struct seq_file *seq, void *v) |
437 | { | |
3cf93c96 | 438 | const struct recent_entry *e = v; |
404bdbfd PM |
439 | unsigned int i; |
440 | ||
441 | i = (e->index - 1) % ip_pkt_list_tot; | |
ee999d8b | 442 | if (e->family == NFPROTO_IPV4) |
14d5e834 HH |
443 | seq_printf(seq, "src=%pI4 ttl: %u last_seen: %lu oldest_pkt: %u", |
444 | &e->addr.ip, e->ttl, e->stamps[i], e->index); | |
079aa88f | 445 | else |
5b095d98 | 446 | seq_printf(seq, "src=%pI6 ttl: %u last_seen: %lu oldest_pkt: %u", |
38ff4fa4 | 447 | &e->addr.in6, e->ttl, e->stamps[i], e->index); |
404bdbfd PM |
448 | for (i = 0; i < e->nstamps; i++) |
449 | seq_printf(seq, "%s %lu", i ? "," : "", e->stamps[i]); | |
450 | seq_printf(seq, "\n"); | |
451 | return 0; | |
452 | } | |
1da177e4 | 453 | |
56b3d975 | 454 | static const struct seq_operations recent_seq_ops = { |
404bdbfd PM |
455 | .start = recent_seq_start, |
456 | .next = recent_seq_next, | |
457 | .stop = recent_seq_stop, | |
458 | .show = recent_seq_show, | |
459 | }; | |
1da177e4 | 460 | |
404bdbfd PM |
461 | static int recent_seq_open(struct inode *inode, struct file *file) |
462 | { | |
463 | struct proc_dir_entry *pde = PDE(inode); | |
404bdbfd | 464 | struct recent_iter_state *st; |
404bdbfd | 465 | |
e2da5913 | 466 | st = __seq_open_private(file, &recent_seq_ops, sizeof(*st)); |
404bdbfd PM |
467 | if (st == NULL) |
468 | return -ENOMEM; | |
3af8e31c | 469 | |
404bdbfd | 470 | st->table = pde->data; |
e2da5913 | 471 | return 0; |
404bdbfd | 472 | } |
1da177e4 | 473 | |
079aa88f JE |
474 | #ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT |
475 | static int recent_old_seq_open(struct inode *inode, struct file *filp) | |
476 | { | |
477 | static bool warned_of_old; | |
478 | ||
479 | if (unlikely(!warned_of_old)) { | |
480 | printk(KERN_INFO KBUILD_MODNAME ": Use of /proc/net/ipt_recent" | |
481 | " is deprecated; use /proc/net/xt_recent.\n"); | |
482 | warned_of_old = true; | |
483 | } | |
484 | return recent_seq_open(inode, filp); | |
485 | } | |
486 | ||
487 | static ssize_t recent_old_proc_write(struct file *file, | |
488 | const char __user *input, | |
489 | size_t size, loff_t *loff) | |
404bdbfd | 490 | { |
3cf93c96 | 491 | const struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode); |
404bdbfd PM |
492 | struct recent_table *t = pde->data; |
493 | struct recent_entry *e; | |
494 | char buf[sizeof("+255.255.255.255")], *c = buf; | |
37e55cf0 | 495 | union nf_inet_addr addr = {}; |
404bdbfd PM |
496 | int add; |
497 | ||
498 | if (size > sizeof(buf)) | |
499 | size = sizeof(buf); | |
500 | if (copy_from_user(buf, input, size)) | |
501 | return -EFAULT; | |
079aa88f | 502 | |
e7d2860b | 503 | c = skip_spaces(c); |
404bdbfd PM |
504 | |
505 | if (size - (c - buf) < 5) | |
506 | return c - buf; | |
507 | if (!strncmp(c, "clear", 5)) { | |
508 | c += 5; | |
509 | spin_lock_bh(&recent_lock); | |
510 | recent_table_flush(t); | |
1da177e4 | 511 | spin_unlock_bh(&recent_lock); |
404bdbfd | 512 | return c - buf; |
1da177e4 | 513 | } |
1da177e4 | 514 | |
404bdbfd PM |
515 | switch (*c) { |
516 | case '-': | |
517 | add = 0; | |
518 | c++; | |
519 | break; | |
520 | case '+': | |
521 | c++; | |
522 | default: | |
523 | add = 1; | |
524 | break; | |
1da177e4 | 525 | } |
37e55cf0 | 526 | addr.ip = in_aton(c); |
1da177e4 | 527 | |
404bdbfd | 528 | spin_lock_bh(&recent_lock); |
37e55cf0 | 529 | e = recent_entry_lookup(t, &addr, NFPROTO_IPV4, 0); |
404bdbfd PM |
530 | if (e == NULL) { |
531 | if (add) | |
37e55cf0 | 532 | recent_entry_init(t, &addr, NFPROTO_IPV4, 0); |
404bdbfd PM |
533 | } else { |
534 | if (add) | |
535 | recent_entry_update(t, e); | |
536 | else | |
537 | recent_entry_remove(t, e); | |
1da177e4 | 538 | } |
1da177e4 | 539 | spin_unlock_bh(&recent_lock); |
404bdbfd PM |
540 | return size; |
541 | } | |
1da177e4 | 542 | |
079aa88f JE |
543 | static const struct file_operations recent_old_fops = { |
544 | .open = recent_old_seq_open, | |
404bdbfd | 545 | .read = seq_read, |
079aa88f | 546 | .write = recent_old_proc_write, |
404bdbfd PM |
547 | .release = seq_release_private, |
548 | .owner = THIS_MODULE, | |
549 | }; | |
079aa88f JE |
550 | #endif |
551 | ||
552 | static ssize_t | |
553 | recent_mt_proc_write(struct file *file, const char __user *input, | |
554 | size_t size, loff_t *loff) | |
555 | { | |
556 | const struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode); | |
557 | struct recent_table *t = pde->data; | |
558 | struct recent_entry *e; | |
559 | char buf[sizeof("+b335:1d35:1e55:dead:c0de:1715:5afe:c0de")]; | |
560 | const char *c = buf; | |
325fb5b4 | 561 | union nf_inet_addr addr = {}; |
079aa88f JE |
562 | u_int16_t family; |
563 | bool add, succ; | |
564 | ||
565 | if (size == 0) | |
566 | return 0; | |
567 | if (size > sizeof(buf)) | |
568 | size = sizeof(buf); | |
569 | if (copy_from_user(buf, input, size) != 0) | |
570 | return -EFAULT; | |
571 | ||
572 | /* Strict protocol! */ | |
573 | if (*loff != 0) | |
574 | return -ESPIPE; | |
575 | switch (*c) { | |
576 | case '/': /* flush table */ | |
577 | spin_lock_bh(&recent_lock); | |
578 | recent_table_flush(t); | |
579 | spin_unlock_bh(&recent_lock); | |
580 | return size; | |
581 | case '-': /* remove address */ | |
582 | add = false; | |
583 | break; | |
584 | case '+': /* add address */ | |
585 | add = true; | |
586 | break; | |
587 | default: | |
588 | printk(KERN_INFO KBUILD_MODNAME ": Need +ip, -ip or /\n"); | |
589 | return -EINVAL; | |
590 | } | |
591 | ||
592 | ++c; | |
593 | --size; | |
594 | if (strnchr(c, size, ':') != NULL) { | |
ee999d8b | 595 | family = NFPROTO_IPV6; |
079aa88f JE |
596 | succ = in6_pton(c, size, (void *)&addr, '\n', NULL); |
597 | } else { | |
ee999d8b | 598 | family = NFPROTO_IPV4; |
079aa88f JE |
599 | succ = in4_pton(c, size, (void *)&addr, '\n', NULL); |
600 | } | |
601 | ||
602 | if (!succ) { | |
603 | printk(KERN_INFO KBUILD_MODNAME ": illegal address written " | |
604 | "to procfs\n"); | |
605 | return -EINVAL; | |
606 | } | |
607 | ||
608 | spin_lock_bh(&recent_lock); | |
609 | e = recent_entry_lookup(t, &addr, family, 0); | |
610 | if (e == NULL) { | |
611 | if (add) | |
612 | recent_entry_init(t, &addr, family, 0); | |
613 | } else { | |
614 | if (add) | |
615 | recent_entry_update(t, e); | |
616 | else | |
617 | recent_entry_remove(t, e); | |
618 | } | |
619 | spin_unlock_bh(&recent_lock); | |
620 | /* Note we removed one above */ | |
621 | *loff += size + 1; | |
622 | return size + 1; | |
623 | } | |
624 | ||
625 | static const struct file_operations recent_mt_fops = { | |
626 | .open = recent_seq_open, | |
627 | .read = seq_read, | |
628 | .write = recent_mt_proc_write, | |
629 | .release = seq_release_private, | |
630 | .owner = THIS_MODULE, | |
631 | }; | |
7d07d563 AD |
632 | |
633 | static int __net_init recent_proc_net_init(struct net *net) | |
634 | { | |
635 | struct recent_net *recent_net = recent_pernet(net); | |
636 | ||
637 | recent_net->xt_recent = proc_mkdir("xt_recent", net->proc_net); | |
638 | if (!recent_net->xt_recent) | |
639 | return -ENOMEM; | |
640 | #ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT | |
641 | recent_net->ipt_recent = proc_mkdir("ipt_recent", net->proc_net); | |
642 | if (!recent_net->ipt_recent) { | |
643 | proc_net_remove(net, "xt_recent"); | |
644 | return -ENOMEM; | |
645 | } | |
646 | #endif | |
647 | return 0; | |
648 | } | |
649 | ||
650 | static void __net_exit recent_proc_net_exit(struct net *net) | |
651 | { | |
652 | #ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT | |
653 | proc_net_remove(net, "ipt_recent"); | |
654 | #endif | |
655 | proc_net_remove(net, "xt_recent"); | |
656 | } | |
657 | #else | |
658 | static inline int recent_proc_net_init(struct net *net) | |
659 | { | |
660 | return 0; | |
661 | } | |
662 | ||
663 | static inline void recent_proc_net_exit(struct net *net) | |
664 | { | |
665 | } | |
1da177e4 | 666 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 667 | |
7d07d563 AD |
668 | static int __net_init recent_net_init(struct net *net) |
669 | { | |
670 | struct recent_net *recent_net = recent_pernet(net); | |
671 | ||
672 | INIT_LIST_HEAD(&recent_net->tables); | |
673 | return recent_proc_net_init(net); | |
674 | } | |
675 | ||
676 | static void __net_exit recent_net_exit(struct net *net) | |
677 | { | |
678 | struct recent_net *recent_net = recent_pernet(net); | |
679 | ||
680 | BUG_ON(!list_empty(&recent_net->tables)); | |
681 | recent_proc_net_exit(net); | |
682 | } | |
683 | ||
684 | static struct pernet_operations recent_net_ops = { | |
685 | .init = recent_net_init, | |
686 | .exit = recent_net_exit, | |
687 | .id = &recent_net_id, | |
688 | .size = sizeof(struct recent_net), | |
689 | }; | |
690 | ||
079aa88f JE |
691 | static struct xt_match recent_mt_reg[] __read_mostly = { |
692 | { | |
693 | .name = "recent", | |
694 | .revision = 0, | |
ee999d8b | 695 | .family = NFPROTO_IPV4, |
079aa88f JE |
696 | .match = recent_mt, |
697 | .matchsize = sizeof(struct xt_recent_mtinfo), | |
698 | .checkentry = recent_mt_check, | |
699 | .destroy = recent_mt_destroy, | |
700 | .me = THIS_MODULE, | |
701 | }, | |
702 | { | |
703 | .name = "recent", | |
704 | .revision = 0, | |
ee999d8b | 705 | .family = NFPROTO_IPV6, |
079aa88f JE |
706 | .match = recent_mt, |
707 | .matchsize = sizeof(struct xt_recent_mtinfo), | |
708 | .checkentry = recent_mt_check, | |
709 | .destroy = recent_mt_destroy, | |
710 | .me = THIS_MODULE, | |
711 | }, | |
1da177e4 LT |
712 | }; |
713 | ||
d3c5ee6d | 714 | static int __init recent_mt_init(void) |
1da177e4 | 715 | { |
404bdbfd | 716 | int err; |
1da177e4 | 717 | |
404bdbfd PM |
718 | if (!ip_list_tot || !ip_pkt_list_tot || ip_pkt_list_tot > 255) |
719 | return -EINVAL; | |
720 | ip_list_hash_size = 1 << fls(ip_list_tot); | |
1da177e4 | 721 | |
7d07d563 | 722 | err = register_pernet_subsys(&recent_net_ops); |
1da177e4 | 723 | if (err) |
404bdbfd | 724 | return err; |
7d07d563 AD |
725 | err = xt_register_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg)); |
726 | if (err) | |
727 | unregister_pernet_subsys(&recent_net_ops); | |
1da177e4 LT |
728 | return err; |
729 | } | |
730 | ||
d3c5ee6d | 731 | static void __exit recent_mt_exit(void) |
1da177e4 | 732 | { |
079aa88f | 733 | xt_unregister_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg)); |
7d07d563 | 734 | unregister_pernet_subsys(&recent_net_ops); |
1da177e4 LT |
735 | } |
736 | ||
d3c5ee6d JE |
737 | module_init(recent_mt_init); |
738 | module_exit(recent_mt_exit); |