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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>"); |
408ffaa4 | 37 | MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.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 | 55 | MODULE_PARM_DESC(ip_list_tot, "number of IPs to remember per list"); |
98e6d2d5 | 56 | MODULE_PARM_DESC(ip_pkt_list_tot, "number of packets per IP address to remember (max. 255)"); |
404bdbfd | 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 | { | |
2c08522e | 180 | e->index %= ip_pkt_list_tot; |
404bdbfd PM |
181 | e->stamps[e->index++] = jiffies; |
182 | if (e->index > e->nstamps) | |
183 | e->nstamps = e->index; | |
404bdbfd PM |
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 | 269 | continue; |
8ccb92ad | 270 | if (info->hit_count && ++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; |
98e6d2d5 JE |
309 | if (info->hit_count > ip_pkt_list_tot) { |
310 | pr_info(KBUILD_MODNAME ": hitcount (%u) is larger than " | |
311 | "packets to be remembered (%u)\n", | |
312 | info->hit_count, ip_pkt_list_tot); | |
d0ebf133 | 313 | return false; |
98e6d2d5 | 314 | } |
404bdbfd | 315 | if (info->name[0] == '\0' || |
e948b20a | 316 | strnlen(info->name, XT_RECENT_NAME_LEN) == XT_RECENT_NAME_LEN) |
ccb79bdc | 317 | return false; |
1da177e4 | 318 | |
a0e889bb | 319 | mutex_lock(&recent_mutex); |
7d07d563 | 320 | t = recent_table_lookup(recent_net, info->name); |
404bdbfd PM |
321 | if (t != NULL) { |
322 | t->refcnt++; | |
ccb79bdc | 323 | ret = true; |
404bdbfd | 324 | goto out; |
1da177e4 LT |
325 | } |
326 | ||
404bdbfd | 327 | t = kzalloc(sizeof(*t) + sizeof(t->iphash[0]) * ip_list_hash_size, |
a0e889bb | 328 | GFP_KERNEL); |
404bdbfd PM |
329 | if (t == NULL) |
330 | goto out; | |
2b2283d0 | 331 | t->refcnt = 1; |
404bdbfd PM |
332 | strcpy(t->name, info->name); |
333 | INIT_LIST_HEAD(&t->lru_list); | |
334 | for (i = 0; i < ip_list_hash_size; i++) | |
335 | INIT_LIST_HEAD(&t->iphash[i]); | |
336 | #ifdef CONFIG_PROC_FS | |
7d07d563 | 337 | pde = proc_create_data(t->name, ip_list_perms, recent_net->xt_recent, |
b09eec16 | 338 | &recent_mt_fops, t); |
b0ceb560 | 339 | if (pde == NULL) { |
404bdbfd PM |
340 | kfree(t); |
341 | goto out; | |
1da177e4 | 342 | } |
b0ceb560 AD |
343 | pde->uid = ip_list_uid; |
344 | pde->gid = ip_list_gid; | |
079aa88f | 345 | #ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT |
7d07d563 | 346 | pde = proc_create_data(t->name, ip_list_perms, recent_net->ipt_recent, |
b09eec16 | 347 | &recent_old_fops, t); |
b0ceb560 | 348 | if (pde == NULL) { |
7d07d563 | 349 | remove_proc_entry(t->name, recent_net->xt_recent); |
079aa88f JE |
350 | kfree(t); |
351 | goto out; | |
352 | } | |
b0ceb560 AD |
353 | pde->uid = ip_list_uid; |
354 | pde->gid = ip_list_gid; | |
079aa88f | 355 | #endif |
1da177e4 | 356 | #endif |
a0e889bb | 357 | spin_lock_bh(&recent_lock); |
7d07d563 | 358 | list_add_tail(&t->list, &recent_net->tables); |
a0e889bb | 359 | spin_unlock_bh(&recent_lock); |
ccb79bdc | 360 | ret = true; |
404bdbfd | 361 | out: |
a0e889bb | 362 | mutex_unlock(&recent_mutex); |
404bdbfd PM |
363 | return ret; |
364 | } | |
1da177e4 | 365 | |
6be3d859 | 366 | static void recent_mt_destroy(const struct xt_mtdtor_param *par) |
404bdbfd | 367 | { |
7d07d563 | 368 | struct recent_net *recent_net = recent_pernet(par->net); |
6be3d859 | 369 | const struct xt_recent_mtinfo *info = par->matchinfo; |
404bdbfd | 370 | struct recent_table *t; |
1da177e4 | 371 | |
a0e889bb | 372 | mutex_lock(&recent_mutex); |
7d07d563 | 373 | t = recent_table_lookup(recent_net, info->name); |
404bdbfd | 374 | if (--t->refcnt == 0) { |
a0e889bb | 375 | spin_lock_bh(&recent_lock); |
404bdbfd | 376 | list_del(&t->list); |
a0e889bb | 377 | spin_unlock_bh(&recent_lock); |
404bdbfd | 378 | #ifdef CONFIG_PROC_FS |
079aa88f | 379 | #ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT |
7d07d563 | 380 | remove_proc_entry(t->name, recent_net->ipt_recent); |
079aa88f | 381 | #endif |
7d07d563 | 382 | remove_proc_entry(t->name, recent_net->xt_recent); |
1da177e4 | 383 | #endif |
a8ddc916 | 384 | recent_table_flush(t); |
404bdbfd | 385 | kfree(t); |
1da177e4 | 386 | } |
a0e889bb | 387 | mutex_unlock(&recent_mutex); |
404bdbfd | 388 | } |
1da177e4 | 389 | |
404bdbfd PM |
390 | #ifdef CONFIG_PROC_FS |
391 | struct recent_iter_state { | |
079aa88f | 392 | const struct recent_table *table; |
404bdbfd PM |
393 | unsigned int bucket; |
394 | }; | |
1da177e4 | 395 | |
404bdbfd | 396 | static void *recent_seq_start(struct seq_file *seq, loff_t *pos) |
855304af | 397 | __acquires(recent_lock) |
404bdbfd PM |
398 | { |
399 | struct recent_iter_state *st = seq->private; | |
a47362a2 | 400 | const struct recent_table *t = st->table; |
404bdbfd PM |
401 | struct recent_entry *e; |
402 | loff_t p = *pos; | |
1da177e4 | 403 | |
1da177e4 | 404 | spin_lock_bh(&recent_lock); |
1da177e4 | 405 | |
7c4e36bc JE |
406 | for (st->bucket = 0; st->bucket < ip_list_hash_size; st->bucket++) |
407 | list_for_each_entry(e, &t->iphash[st->bucket], list) | |
404bdbfd PM |
408 | if (p-- == 0) |
409 | return e; | |
404bdbfd PM |
410 | return NULL; |
411 | } | |
1da177e4 | 412 | |
404bdbfd PM |
413 | static void *recent_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
414 | { | |
415 | struct recent_iter_state *st = seq->private; | |
3cf93c96 | 416 | const struct recent_table *t = st->table; |
079aa88f JE |
417 | const struct recent_entry *e = v; |
418 | const struct list_head *head = e->list.next; | |
404bdbfd PM |
419 | |
420 | while (head == &t->iphash[st->bucket]) { | |
421 | if (++st->bucket >= ip_list_hash_size) | |
422 | return NULL; | |
423 | head = t->iphash[st->bucket].next; | |
424 | } | |
425 | (*pos)++; | |
426 | return list_entry(head, struct recent_entry, list); | |
1da177e4 LT |
427 | } |
428 | ||
404bdbfd | 429 | static void recent_seq_stop(struct seq_file *s, void *v) |
855304af | 430 | __releases(recent_lock) |
1da177e4 | 431 | { |
404bdbfd PM |
432 | spin_unlock_bh(&recent_lock); |
433 | } | |
1da177e4 | 434 | |
404bdbfd PM |
435 | static int recent_seq_show(struct seq_file *seq, void *v) |
436 | { | |
3cf93c96 | 437 | const struct recent_entry *e = v; |
404bdbfd PM |
438 | unsigned int i; |
439 | ||
440 | i = (e->index - 1) % ip_pkt_list_tot; | |
ee999d8b | 441 | if (e->family == NFPROTO_IPV4) |
14d5e834 HH |
442 | seq_printf(seq, "src=%pI4 ttl: %u last_seen: %lu oldest_pkt: %u", |
443 | &e->addr.ip, e->ttl, e->stamps[i], e->index); | |
079aa88f | 444 | else |
5b095d98 | 445 | seq_printf(seq, "src=%pI6 ttl: %u last_seen: %lu oldest_pkt: %u", |
38ff4fa4 | 446 | &e->addr.in6, e->ttl, e->stamps[i], e->index); |
404bdbfd PM |
447 | for (i = 0; i < e->nstamps; i++) |
448 | seq_printf(seq, "%s %lu", i ? "," : "", e->stamps[i]); | |
449 | seq_printf(seq, "\n"); | |
450 | return 0; | |
451 | } | |
1da177e4 | 452 | |
56b3d975 | 453 | static const struct seq_operations recent_seq_ops = { |
404bdbfd PM |
454 | .start = recent_seq_start, |
455 | .next = recent_seq_next, | |
456 | .stop = recent_seq_stop, | |
457 | .show = recent_seq_show, | |
458 | }; | |
1da177e4 | 459 | |
404bdbfd PM |
460 | static int recent_seq_open(struct inode *inode, struct file *file) |
461 | { | |
462 | struct proc_dir_entry *pde = PDE(inode); | |
404bdbfd | 463 | struct recent_iter_state *st; |
404bdbfd | 464 | |
e2da5913 | 465 | st = __seq_open_private(file, &recent_seq_ops, sizeof(*st)); |
404bdbfd PM |
466 | if (st == NULL) |
467 | return -ENOMEM; | |
3af8e31c | 468 | |
404bdbfd | 469 | st->table = pde->data; |
e2da5913 | 470 | return 0; |
404bdbfd | 471 | } |
1da177e4 | 472 | |
079aa88f JE |
473 | #ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT |
474 | static int recent_old_seq_open(struct inode *inode, struct file *filp) | |
475 | { | |
476 | static bool warned_of_old; | |
477 | ||
478 | if (unlikely(!warned_of_old)) { | |
479 | printk(KERN_INFO KBUILD_MODNAME ": Use of /proc/net/ipt_recent" | |
480 | " is deprecated; use /proc/net/xt_recent.\n"); | |
481 | warned_of_old = true; | |
482 | } | |
483 | return recent_seq_open(inode, filp); | |
484 | } | |
485 | ||
486 | static ssize_t recent_old_proc_write(struct file *file, | |
487 | const char __user *input, | |
488 | size_t size, loff_t *loff) | |
404bdbfd | 489 | { |
3cf93c96 | 490 | const struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode); |
404bdbfd PM |
491 | struct recent_table *t = pde->data; |
492 | struct recent_entry *e; | |
493 | char buf[sizeof("+255.255.255.255")], *c = buf; | |
37e55cf0 | 494 | union nf_inet_addr addr = {}; |
404bdbfd PM |
495 | int add; |
496 | ||
497 | if (size > sizeof(buf)) | |
498 | size = sizeof(buf); | |
499 | if (copy_from_user(buf, input, size)) | |
500 | return -EFAULT; | |
079aa88f | 501 | |
e7d2860b | 502 | c = skip_spaces(c); |
404bdbfd PM |
503 | |
504 | if (size - (c - buf) < 5) | |
505 | return c - buf; | |
506 | if (!strncmp(c, "clear", 5)) { | |
507 | c += 5; | |
508 | spin_lock_bh(&recent_lock); | |
509 | recent_table_flush(t); | |
1da177e4 | 510 | spin_unlock_bh(&recent_lock); |
404bdbfd | 511 | return c - buf; |
1da177e4 | 512 | } |
1da177e4 | 513 | |
404bdbfd PM |
514 | switch (*c) { |
515 | case '-': | |
516 | add = 0; | |
517 | c++; | |
518 | break; | |
519 | case '+': | |
520 | c++; | |
521 | default: | |
522 | add = 1; | |
523 | break; | |
1da177e4 | 524 | } |
37e55cf0 | 525 | addr.ip = in_aton(c); |
1da177e4 | 526 | |
404bdbfd | 527 | spin_lock_bh(&recent_lock); |
37e55cf0 | 528 | e = recent_entry_lookup(t, &addr, NFPROTO_IPV4, 0); |
404bdbfd PM |
529 | if (e == NULL) { |
530 | if (add) | |
37e55cf0 | 531 | recent_entry_init(t, &addr, NFPROTO_IPV4, 0); |
404bdbfd PM |
532 | } else { |
533 | if (add) | |
534 | recent_entry_update(t, e); | |
535 | else | |
536 | recent_entry_remove(t, e); | |
1da177e4 | 537 | } |
1da177e4 | 538 | spin_unlock_bh(&recent_lock); |
404bdbfd PM |
539 | return size; |
540 | } | |
1da177e4 | 541 | |
079aa88f JE |
542 | static const struct file_operations recent_old_fops = { |
543 | .open = recent_old_seq_open, | |
404bdbfd | 544 | .read = seq_read, |
079aa88f | 545 | .write = recent_old_proc_write, |
404bdbfd PM |
546 | .release = seq_release_private, |
547 | .owner = THIS_MODULE, | |
548 | }; | |
079aa88f JE |
549 | #endif |
550 | ||
551 | static ssize_t | |
552 | recent_mt_proc_write(struct file *file, const char __user *input, | |
553 | size_t size, loff_t *loff) | |
554 | { | |
555 | const struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode); | |
556 | struct recent_table *t = pde->data; | |
557 | struct recent_entry *e; | |
558 | char buf[sizeof("+b335:1d35:1e55:dead:c0de:1715:5afe:c0de")]; | |
559 | const char *c = buf; | |
325fb5b4 | 560 | union nf_inet_addr addr = {}; |
079aa88f JE |
561 | u_int16_t family; |
562 | bool add, succ; | |
563 | ||
564 | if (size == 0) | |
565 | return 0; | |
566 | if (size > sizeof(buf)) | |
567 | size = sizeof(buf); | |
568 | if (copy_from_user(buf, input, size) != 0) | |
569 | return -EFAULT; | |
570 | ||
571 | /* Strict protocol! */ | |
572 | if (*loff != 0) | |
573 | return -ESPIPE; | |
574 | switch (*c) { | |
575 | case '/': /* flush table */ | |
576 | spin_lock_bh(&recent_lock); | |
577 | recent_table_flush(t); | |
578 | spin_unlock_bh(&recent_lock); | |
579 | return size; | |
580 | case '-': /* remove address */ | |
581 | add = false; | |
582 | break; | |
583 | case '+': /* add address */ | |
584 | add = true; | |
585 | break; | |
586 | default: | |
587 | printk(KERN_INFO KBUILD_MODNAME ": Need +ip, -ip or /\n"); | |
588 | return -EINVAL; | |
589 | } | |
590 | ||
591 | ++c; | |
592 | --size; | |
593 | if (strnchr(c, size, ':') != NULL) { | |
ee999d8b | 594 | family = NFPROTO_IPV6; |
079aa88f JE |
595 | succ = in6_pton(c, size, (void *)&addr, '\n', NULL); |
596 | } else { | |
ee999d8b | 597 | family = NFPROTO_IPV4; |
079aa88f JE |
598 | succ = in4_pton(c, size, (void *)&addr, '\n', NULL); |
599 | } | |
600 | ||
601 | if (!succ) { | |
602 | printk(KERN_INFO KBUILD_MODNAME ": illegal address written " | |
603 | "to procfs\n"); | |
604 | return -EINVAL; | |
605 | } | |
606 | ||
607 | spin_lock_bh(&recent_lock); | |
608 | e = recent_entry_lookup(t, &addr, family, 0); | |
609 | if (e == NULL) { | |
610 | if (add) | |
611 | recent_entry_init(t, &addr, family, 0); | |
612 | } else { | |
613 | if (add) | |
614 | recent_entry_update(t, e); | |
615 | else | |
616 | recent_entry_remove(t, e); | |
617 | } | |
618 | spin_unlock_bh(&recent_lock); | |
619 | /* Note we removed one above */ | |
620 | *loff += size + 1; | |
621 | return size + 1; | |
622 | } | |
623 | ||
624 | static const struct file_operations recent_mt_fops = { | |
625 | .open = recent_seq_open, | |
626 | .read = seq_read, | |
627 | .write = recent_mt_proc_write, | |
628 | .release = seq_release_private, | |
629 | .owner = THIS_MODULE, | |
630 | }; | |
7d07d563 AD |
631 | |
632 | static int __net_init recent_proc_net_init(struct net *net) | |
633 | { | |
634 | struct recent_net *recent_net = recent_pernet(net); | |
635 | ||
636 | recent_net->xt_recent = proc_mkdir("xt_recent", net->proc_net); | |
637 | if (!recent_net->xt_recent) | |
638 | return -ENOMEM; | |
639 | #ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT | |
640 | recent_net->ipt_recent = proc_mkdir("ipt_recent", net->proc_net); | |
641 | if (!recent_net->ipt_recent) { | |
642 | proc_net_remove(net, "xt_recent"); | |
643 | return -ENOMEM; | |
644 | } | |
645 | #endif | |
646 | return 0; | |
647 | } | |
648 | ||
649 | static void __net_exit recent_proc_net_exit(struct net *net) | |
650 | { | |
651 | #ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT | |
652 | proc_net_remove(net, "ipt_recent"); | |
653 | #endif | |
654 | proc_net_remove(net, "xt_recent"); | |
655 | } | |
656 | #else | |
657 | static inline int recent_proc_net_init(struct net *net) | |
658 | { | |
659 | return 0; | |
660 | } | |
661 | ||
662 | static inline void recent_proc_net_exit(struct net *net) | |
663 | { | |
664 | } | |
1da177e4 | 665 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 666 | |
7d07d563 AD |
667 | static int __net_init recent_net_init(struct net *net) |
668 | { | |
669 | struct recent_net *recent_net = recent_pernet(net); | |
670 | ||
671 | INIT_LIST_HEAD(&recent_net->tables); | |
672 | return recent_proc_net_init(net); | |
673 | } | |
674 | ||
675 | static void __net_exit recent_net_exit(struct net *net) | |
676 | { | |
677 | struct recent_net *recent_net = recent_pernet(net); | |
678 | ||
679 | BUG_ON(!list_empty(&recent_net->tables)); | |
680 | recent_proc_net_exit(net); | |
681 | } | |
682 | ||
683 | static struct pernet_operations recent_net_ops = { | |
684 | .init = recent_net_init, | |
685 | .exit = recent_net_exit, | |
686 | .id = &recent_net_id, | |
687 | .size = sizeof(struct recent_net), | |
688 | }; | |
689 | ||
079aa88f JE |
690 | static struct xt_match recent_mt_reg[] __read_mostly = { |
691 | { | |
692 | .name = "recent", | |
693 | .revision = 0, | |
ee999d8b | 694 | .family = NFPROTO_IPV4, |
079aa88f JE |
695 | .match = recent_mt, |
696 | .matchsize = sizeof(struct xt_recent_mtinfo), | |
697 | .checkentry = recent_mt_check, | |
698 | .destroy = recent_mt_destroy, | |
699 | .me = THIS_MODULE, | |
700 | }, | |
701 | { | |
702 | .name = "recent", | |
703 | .revision = 0, | |
ee999d8b | 704 | .family = NFPROTO_IPV6, |
079aa88f JE |
705 | .match = recent_mt, |
706 | .matchsize = sizeof(struct xt_recent_mtinfo), | |
707 | .checkentry = recent_mt_check, | |
708 | .destroy = recent_mt_destroy, | |
709 | .me = THIS_MODULE, | |
710 | }, | |
1da177e4 LT |
711 | }; |
712 | ||
d3c5ee6d | 713 | static int __init recent_mt_init(void) |
1da177e4 | 714 | { |
404bdbfd | 715 | int err; |
1da177e4 | 716 | |
404bdbfd PM |
717 | if (!ip_list_tot || !ip_pkt_list_tot || ip_pkt_list_tot > 255) |
718 | return -EINVAL; | |
719 | ip_list_hash_size = 1 << fls(ip_list_tot); | |
1da177e4 | 720 | |
7d07d563 | 721 | err = register_pernet_subsys(&recent_net_ops); |
1da177e4 | 722 | if (err) |
404bdbfd | 723 | return err; |
7d07d563 AD |
724 | err = xt_register_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg)); |
725 | if (err) | |
726 | unregister_pernet_subsys(&recent_net_ops); | |
1da177e4 LT |
727 | return err; |
728 | } | |
729 | ||
d3c5ee6d | 730 | static void __exit recent_mt_exit(void) |
1da177e4 | 731 | { |
079aa88f | 732 | xt_unregister_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg)); |
7d07d563 | 733 | unregister_pernet_subsys(&recent_net_ops); |
1da177e4 LT |
734 | } |
735 | ||
d3c5ee6d JE |
736 | module_init(recent_mt_init); |
737 | module_exit(recent_mt_exit); |