]>
Commit | Line | Data |
---|---|---|
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>"); |
06bf514e | 38 | MODULE_DESCRIPTION("Xtables: \"recently-seen\" host matching"); |
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; | |
7d07d563 AD |
86 | #endif |
87 | }; | |
88 | ||
89 | static int recent_net_id; | |
90 | static inline struct recent_net *recent_pernet(struct net *net) | |
91 | { | |
92 | return net_generic(net, recent_net_id); | |
93 | } | |
94 | ||
1da177e4 | 95 | static DEFINE_SPINLOCK(recent_lock); |
a0e889bb | 96 | static DEFINE_MUTEX(recent_mutex); |
1da177e4 LT |
97 | |
98 | #ifdef CONFIG_PROC_FS | |
079aa88f | 99 | static const struct file_operations recent_old_fops, recent_mt_fops; |
1da177e4 LT |
100 | #endif |
101 | ||
294188ae JE |
102 | static u_int32_t hash_rnd __read_mostly; |
103 | static bool hash_rnd_inited __read_mostly; | |
079aa88f | 104 | |
294188ae | 105 | static inline unsigned int recent_entry_hash4(const union nf_inet_addr *addr) |
079aa88f | 106 | { |
079aa88f JE |
107 | return jhash_1word((__force u32)addr->ip, hash_rnd) & |
108 | (ip_list_hash_size - 1); | |
109 | } | |
1da177e4 | 110 | |
294188ae | 111 | static inline unsigned int recent_entry_hash6(const union nf_inet_addr *addr) |
1da177e4 | 112 | { |
079aa88f JE |
113 | return jhash2((u32 *)addr->ip6, ARRAY_SIZE(addr->ip6), hash_rnd) & |
114 | (ip_list_hash_size - 1); | |
1da177e4 LT |
115 | } |
116 | ||
404bdbfd | 117 | static struct recent_entry * |
079aa88f JE |
118 | recent_entry_lookup(const struct recent_table *table, |
119 | const union nf_inet_addr *addrp, u_int16_t family, | |
120 | u_int8_t ttl) | |
1da177e4 | 121 | { |
404bdbfd PM |
122 | struct recent_entry *e; |
123 | unsigned int h; | |
124 | ||
ee999d8b | 125 | if (family == NFPROTO_IPV4) |
079aa88f JE |
126 | h = recent_entry_hash4(addrp); |
127 | else | |
128 | h = recent_entry_hash6(addrp); | |
129 | ||
404bdbfd | 130 | list_for_each_entry(e, &table->iphash[h], list) |
079aa88f JE |
131 | if (e->family == family && |
132 | memcmp(&e->addr, addrp, sizeof(e->addr)) == 0 && | |
133 | (ttl == e->ttl || ttl == 0 || e->ttl == 0)) | |
404bdbfd PM |
134 | return e; |
135 | return NULL; | |
136 | } | |
1da177e4 | 137 | |
404bdbfd PM |
138 | static void recent_entry_remove(struct recent_table *t, struct recent_entry *e) |
139 | { | |
140 | list_del(&e->list); | |
141 | list_del(&e->lru_list); | |
142 | kfree(e); | |
143 | t->entries--; | |
144 | } | |
1da177e4 | 145 | |
0079c5ae TG |
146 | /* |
147 | * Drop entries with timestamps older then 'time'. | |
148 | */ | |
149 | static void recent_entry_reap(struct recent_table *t, unsigned long time) | |
150 | { | |
151 | struct recent_entry *e; | |
152 | ||
153 | /* | |
154 | * The head of the LRU list is always the oldest entry. | |
155 | */ | |
156 | e = list_entry(t->lru_list.next, struct recent_entry, lru_list); | |
157 | ||
158 | /* | |
159 | * The last time stamp is the most recent. | |
160 | */ | |
161 | if (time_after(time, e->stamps[e->index-1])) | |
162 | recent_entry_remove(t, e); | |
163 | } | |
164 | ||
404bdbfd | 165 | static struct recent_entry * |
079aa88f JE |
166 | recent_entry_init(struct recent_table *t, const union nf_inet_addr *addr, |
167 | u_int16_t family, u_int8_t ttl) | |
404bdbfd PM |
168 | { |
169 | struct recent_entry *e; | |
1da177e4 | 170 | |
404bdbfd PM |
171 | if (t->entries >= ip_list_tot) { |
172 | e = list_entry(t->lru_list.next, struct recent_entry, lru_list); | |
173 | recent_entry_remove(t, e); | |
1da177e4 | 174 | } |
404bdbfd PM |
175 | e = kmalloc(sizeof(*e) + sizeof(e->stamps[0]) * ip_pkt_list_tot, |
176 | GFP_ATOMIC); | |
177 | if (e == NULL) | |
178 | return NULL; | |
079aa88f | 179 | memcpy(&e->addr, addr, sizeof(e->addr)); |
404bdbfd PM |
180 | e->ttl = ttl; |
181 | e->stamps[0] = jiffies; | |
182 | e->nstamps = 1; | |
183 | e->index = 1; | |
079aa88f | 184 | e->family = family; |
ee999d8b | 185 | if (family == NFPROTO_IPV4) |
079aa88f JE |
186 | list_add_tail(&e->list, &t->iphash[recent_entry_hash4(addr)]); |
187 | else | |
188 | list_add_tail(&e->list, &t->iphash[recent_entry_hash6(addr)]); | |
404bdbfd PM |
189 | list_add_tail(&e->lru_list, &t->lru_list); |
190 | t->entries++; | |
191 | return e; | |
192 | } | |
1da177e4 | 193 | |
404bdbfd PM |
194 | static void recent_entry_update(struct recent_table *t, struct recent_entry *e) |
195 | { | |
2c08522e | 196 | e->index %= ip_pkt_list_tot; |
404bdbfd PM |
197 | e->stamps[e->index++] = jiffies; |
198 | if (e->index > e->nstamps) | |
199 | e->nstamps = e->index; | |
404bdbfd PM |
200 | list_move_tail(&e->lru_list, &t->lru_list); |
201 | } | |
1da177e4 | 202 | |
7d07d563 AD |
203 | static struct recent_table *recent_table_lookup(struct recent_net *recent_net, |
204 | const char *name) | |
404bdbfd PM |
205 | { |
206 | struct recent_table *t; | |
1da177e4 | 207 | |
7d07d563 | 208 | list_for_each_entry(t, &recent_net->tables, list) |
404bdbfd PM |
209 | if (!strcmp(t->name, name)) |
210 | return t; | |
211 | return NULL; | |
212 | } | |
1da177e4 | 213 | |
404bdbfd PM |
214 | static void recent_table_flush(struct recent_table *t) |
215 | { | |
216 | struct recent_entry *e, *next; | |
217 | unsigned int i; | |
1da177e4 | 218 | |
7c4e36bc | 219 | for (i = 0; i < ip_list_hash_size; i++) |
404bdbfd PM |
220 | list_for_each_entry_safe(e, next, &t->iphash[i], list) |
221 | recent_entry_remove(t, e); | |
1da177e4 LT |
222 | } |
223 | ||
1d93a9cb | 224 | static bool |
f7108a20 | 225 | recent_mt(const struct sk_buff *skb, const struct xt_match_param *par) |
1da177e4 | 226 | { |
7d07d563 AD |
227 | struct net *net = dev_net(par->in ? par->in : par->out); |
228 | struct recent_net *recent_net = recent_pernet(net); | |
f7108a20 | 229 | const struct xt_recent_mtinfo *info = par->matchinfo; |
404bdbfd PM |
230 | struct recent_table *t; |
231 | struct recent_entry *e; | |
079aa88f | 232 | union nf_inet_addr addr = {}; |
404bdbfd | 233 | u_int8_t ttl; |
1d93a9cb | 234 | bool ret = info->invert; |
1da177e4 | 235 | |
f7108a20 | 236 | if (par->match->family == NFPROTO_IPV4) { |
079aa88f JE |
237 | const struct iphdr *iph = ip_hdr(skb); |
238 | ||
239 | if (info->side == XT_RECENT_DEST) | |
240 | addr.ip = iph->daddr; | |
241 | else | |
242 | addr.ip = iph->saddr; | |
243 | ||
244 | ttl = iph->ttl; | |
245 | } else { | |
246 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
247 | ||
248 | if (info->side == XT_RECENT_DEST) | |
249 | memcpy(&addr.in6, &iph->daddr, sizeof(addr.in6)); | |
250 | else | |
251 | memcpy(&addr.in6, &iph->saddr, sizeof(addr.in6)); | |
252 | ||
253 | ttl = iph->hop_limit; | |
254 | } | |
1da177e4 | 255 | |
404bdbfd | 256 | /* use TTL as seen before forwarding */ |
f7108a20 | 257 | if (par->out != NULL && skb->sk == NULL) |
404bdbfd | 258 | ttl++; |
1da177e4 | 259 | |
1da177e4 | 260 | spin_lock_bh(&recent_lock); |
7d07d563 | 261 | t = recent_table_lookup(recent_net, info->name); |
f7108a20 | 262 | e = recent_entry_lookup(t, &addr, par->match->family, |
079aa88f | 263 | (info->check_set & XT_RECENT_TTL) ? ttl : 0); |
404bdbfd | 264 | if (e == NULL) { |
e948b20a | 265 | if (!(info->check_set & XT_RECENT_SET)) |
404bdbfd | 266 | goto out; |
f7108a20 | 267 | e = recent_entry_init(t, &addr, par->match->family, ttl); |
404bdbfd | 268 | if (e == NULL) |
f7108a20 | 269 | *par->hotdrop = true; |
1d93a9cb | 270 | ret = !ret; |
404bdbfd | 271 | goto out; |
1da177e4 LT |
272 | } |
273 | ||
e948b20a | 274 | if (info->check_set & XT_RECENT_SET) |
1d93a9cb | 275 | ret = !ret; |
e948b20a | 276 | else if (info->check_set & XT_RECENT_REMOVE) { |
404bdbfd | 277 | recent_entry_remove(t, e); |
1d93a9cb | 278 | ret = !ret; |
e948b20a | 279 | } else if (info->check_set & (XT_RECENT_CHECK | XT_RECENT_UPDATE)) { |
855304af | 280 | unsigned long time = jiffies - info->seconds * HZ; |
404bdbfd PM |
281 | unsigned int i, hits = 0; |
282 | ||
283 | for (i = 0; i < e->nstamps; i++) { | |
855304af | 284 | if (info->seconds && time_after(time, e->stamps[i])) |
404bdbfd | 285 | continue; |
8ccb92ad | 286 | if (info->hit_count && ++hits >= info->hit_count) { |
1d93a9cb | 287 | ret = !ret; |
404bdbfd | 288 | break; |
1da177e4 | 289 | } |
1da177e4 | 290 | } |
0079c5ae TG |
291 | |
292 | /* info->seconds must be non-zero */ | |
293 | if (info->check_set & XT_RECENT_REAP) | |
294 | recent_entry_reap(t, time); | |
1da177e4 LT |
295 | } |
296 | ||
e948b20a JE |
297 | if (info->check_set & XT_RECENT_SET || |
298 | (info->check_set & XT_RECENT_UPDATE && ret)) { | |
404bdbfd PM |
299 | recent_entry_update(t, e); |
300 | e->ttl = ttl; | |
301 | } | |
302 | out: | |
303 | spin_unlock_bh(&recent_lock); | |
304 | return ret; | |
1da177e4 LT |
305 | } |
306 | ||
9b4fce7a | 307 | static bool recent_mt_check(const struct xt_mtchk_param *par) |
1da177e4 | 308 | { |
7d07d563 | 309 | struct recent_net *recent_net = recent_pernet(par->net); |
9b4fce7a | 310 | const struct xt_recent_mtinfo *info = par->matchinfo; |
404bdbfd | 311 | struct recent_table *t; |
b0ceb560 AD |
312 | #ifdef CONFIG_PROC_FS |
313 | struct proc_dir_entry *pde; | |
314 | #endif | |
404bdbfd | 315 | unsigned i; |
ccb79bdc | 316 | bool ret = false; |
1da177e4 | 317 | |
294188ae JE |
318 | if (unlikely(!hash_rnd_inited)) { |
319 | get_random_bytes(&hash_rnd, sizeof(hash_rnd)); | |
320 | hash_rnd_inited = true; | |
321 | } | |
606a9a02 TG |
322 | if (info->check_set & ~XT_RECENT_VALID_FLAGS) { |
323 | pr_info(KBUILD_MODNAME ": Unsupported user space flags " | |
324 | "(%08x)\n", info->check_set); | |
325 | return false; | |
326 | } | |
404bdbfd | 327 | if (hweight8(info->check_set & |
e948b20a JE |
328 | (XT_RECENT_SET | XT_RECENT_REMOVE | |
329 | XT_RECENT_CHECK | XT_RECENT_UPDATE)) != 1) | |
ccb79bdc | 330 | return false; |
e948b20a | 331 | if ((info->check_set & (XT_RECENT_SET | XT_RECENT_REMOVE)) && |
0079c5ae TG |
332 | (info->seconds || info->hit_count || |
333 | (info->check_set & XT_RECENT_MODIFIERS))) | |
334 | return false; | |
335 | if ((info->check_set & XT_RECENT_REAP) && !info->seconds) | |
ccb79bdc | 336 | return false; |
98e6d2d5 JE |
337 | if (info->hit_count > ip_pkt_list_tot) { |
338 | pr_info(KBUILD_MODNAME ": hitcount (%u) is larger than " | |
339 | "packets to be remembered (%u)\n", | |
340 | info->hit_count, ip_pkt_list_tot); | |
d0ebf133 | 341 | return false; |
98e6d2d5 | 342 | } |
404bdbfd | 343 | if (info->name[0] == '\0' || |
e948b20a | 344 | strnlen(info->name, XT_RECENT_NAME_LEN) == XT_RECENT_NAME_LEN) |
ccb79bdc | 345 | return false; |
1da177e4 | 346 | |
a0e889bb | 347 | mutex_lock(&recent_mutex); |
7d07d563 | 348 | t = recent_table_lookup(recent_net, info->name); |
404bdbfd PM |
349 | if (t != NULL) { |
350 | t->refcnt++; | |
ccb79bdc | 351 | ret = true; |
404bdbfd | 352 | goto out; |
1da177e4 LT |
353 | } |
354 | ||
404bdbfd | 355 | t = kzalloc(sizeof(*t) + sizeof(t->iphash[0]) * ip_list_hash_size, |
a0e889bb | 356 | GFP_KERNEL); |
404bdbfd PM |
357 | if (t == NULL) |
358 | goto out; | |
2b2283d0 | 359 | t->refcnt = 1; |
404bdbfd PM |
360 | strcpy(t->name, info->name); |
361 | INIT_LIST_HEAD(&t->lru_list); | |
362 | for (i = 0; i < ip_list_hash_size; i++) | |
363 | INIT_LIST_HEAD(&t->iphash[i]); | |
364 | #ifdef CONFIG_PROC_FS | |
7d07d563 | 365 | pde = proc_create_data(t->name, ip_list_perms, recent_net->xt_recent, |
b09eec16 | 366 | &recent_mt_fops, t); |
b0ceb560 | 367 | if (pde == NULL) { |
404bdbfd PM |
368 | kfree(t); |
369 | goto out; | |
1da177e4 | 370 | } |
b0ceb560 AD |
371 | pde->uid = ip_list_uid; |
372 | pde->gid = ip_list_gid; | |
1da177e4 | 373 | #endif |
a0e889bb | 374 | spin_lock_bh(&recent_lock); |
7d07d563 | 375 | list_add_tail(&t->list, &recent_net->tables); |
a0e889bb | 376 | spin_unlock_bh(&recent_lock); |
ccb79bdc | 377 | ret = true; |
404bdbfd | 378 | out: |
a0e889bb | 379 | mutex_unlock(&recent_mutex); |
404bdbfd PM |
380 | return ret; |
381 | } | |
1da177e4 | 382 | |
6be3d859 | 383 | static void recent_mt_destroy(const struct xt_mtdtor_param *par) |
404bdbfd | 384 | { |
7d07d563 | 385 | struct recent_net *recent_net = recent_pernet(par->net); |
6be3d859 | 386 | const struct xt_recent_mtinfo *info = par->matchinfo; |
404bdbfd | 387 | struct recent_table *t; |
1da177e4 | 388 | |
a0e889bb | 389 | mutex_lock(&recent_mutex); |
7d07d563 | 390 | t = recent_table_lookup(recent_net, info->name); |
404bdbfd | 391 | if (--t->refcnt == 0) { |
a0e889bb | 392 | spin_lock_bh(&recent_lock); |
404bdbfd | 393 | list_del(&t->list); |
a0e889bb | 394 | spin_unlock_bh(&recent_lock); |
404bdbfd | 395 | #ifdef CONFIG_PROC_FS |
7d07d563 | 396 | remove_proc_entry(t->name, recent_net->xt_recent); |
1da177e4 | 397 | #endif |
a8ddc916 | 398 | recent_table_flush(t); |
404bdbfd | 399 | kfree(t); |
1da177e4 | 400 | } |
a0e889bb | 401 | mutex_unlock(&recent_mutex); |
404bdbfd | 402 | } |
1da177e4 | 403 | |
404bdbfd PM |
404 | #ifdef CONFIG_PROC_FS |
405 | struct recent_iter_state { | |
079aa88f | 406 | const struct recent_table *table; |
404bdbfd PM |
407 | unsigned int bucket; |
408 | }; | |
1da177e4 | 409 | |
404bdbfd | 410 | static void *recent_seq_start(struct seq_file *seq, loff_t *pos) |
855304af | 411 | __acquires(recent_lock) |
404bdbfd PM |
412 | { |
413 | struct recent_iter_state *st = seq->private; | |
a47362a2 | 414 | const struct recent_table *t = st->table; |
404bdbfd PM |
415 | struct recent_entry *e; |
416 | loff_t p = *pos; | |
1da177e4 | 417 | |
1da177e4 | 418 | spin_lock_bh(&recent_lock); |
1da177e4 | 419 | |
7c4e36bc JE |
420 | for (st->bucket = 0; st->bucket < ip_list_hash_size; st->bucket++) |
421 | list_for_each_entry(e, &t->iphash[st->bucket], list) | |
404bdbfd PM |
422 | if (p-- == 0) |
423 | return e; | |
404bdbfd PM |
424 | return NULL; |
425 | } | |
1da177e4 | 426 | |
404bdbfd PM |
427 | static void *recent_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
428 | { | |
429 | struct recent_iter_state *st = seq->private; | |
3cf93c96 | 430 | const struct recent_table *t = st->table; |
079aa88f JE |
431 | const struct recent_entry *e = v; |
432 | const struct list_head *head = e->list.next; | |
404bdbfd PM |
433 | |
434 | while (head == &t->iphash[st->bucket]) { | |
435 | if (++st->bucket >= ip_list_hash_size) | |
436 | return NULL; | |
437 | head = t->iphash[st->bucket].next; | |
438 | } | |
439 | (*pos)++; | |
440 | return list_entry(head, struct recent_entry, list); | |
1da177e4 LT |
441 | } |
442 | ||
404bdbfd | 443 | static void recent_seq_stop(struct seq_file *s, void *v) |
855304af | 444 | __releases(recent_lock) |
1da177e4 | 445 | { |
404bdbfd PM |
446 | spin_unlock_bh(&recent_lock); |
447 | } | |
1da177e4 | 448 | |
404bdbfd PM |
449 | static int recent_seq_show(struct seq_file *seq, void *v) |
450 | { | |
3cf93c96 | 451 | const struct recent_entry *e = v; |
404bdbfd PM |
452 | unsigned int i; |
453 | ||
454 | i = (e->index - 1) % ip_pkt_list_tot; | |
ee999d8b | 455 | if (e->family == NFPROTO_IPV4) |
14d5e834 HH |
456 | seq_printf(seq, "src=%pI4 ttl: %u last_seen: %lu oldest_pkt: %u", |
457 | &e->addr.ip, e->ttl, e->stamps[i], e->index); | |
079aa88f | 458 | else |
5b095d98 | 459 | seq_printf(seq, "src=%pI6 ttl: %u last_seen: %lu oldest_pkt: %u", |
38ff4fa4 | 460 | &e->addr.in6, e->ttl, e->stamps[i], e->index); |
404bdbfd PM |
461 | for (i = 0; i < e->nstamps; i++) |
462 | seq_printf(seq, "%s %lu", i ? "," : "", e->stamps[i]); | |
463 | seq_printf(seq, "\n"); | |
464 | return 0; | |
465 | } | |
1da177e4 | 466 | |
56b3d975 | 467 | static const struct seq_operations recent_seq_ops = { |
404bdbfd PM |
468 | .start = recent_seq_start, |
469 | .next = recent_seq_next, | |
470 | .stop = recent_seq_stop, | |
471 | .show = recent_seq_show, | |
472 | }; | |
1da177e4 | 473 | |
404bdbfd PM |
474 | static int recent_seq_open(struct inode *inode, struct file *file) |
475 | { | |
476 | struct proc_dir_entry *pde = PDE(inode); | |
404bdbfd | 477 | struct recent_iter_state *st; |
404bdbfd | 478 | |
e2da5913 | 479 | st = __seq_open_private(file, &recent_seq_ops, sizeof(*st)); |
404bdbfd PM |
480 | if (st == NULL) |
481 | return -ENOMEM; | |
3af8e31c | 482 | |
404bdbfd | 483 | st->table = pde->data; |
e2da5913 | 484 | return 0; |
404bdbfd | 485 | } |
1da177e4 | 486 | |
079aa88f JE |
487 | static ssize_t |
488 | recent_mt_proc_write(struct file *file, const char __user *input, | |
489 | size_t size, loff_t *loff) | |
490 | { | |
491 | const struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode); | |
492 | struct recent_table *t = pde->data; | |
493 | struct recent_entry *e; | |
494 | char buf[sizeof("+b335:1d35:1e55:dead:c0de:1715:5afe:c0de")]; | |
495 | const char *c = buf; | |
325fb5b4 | 496 | union nf_inet_addr addr = {}; |
079aa88f JE |
497 | u_int16_t family; |
498 | bool add, succ; | |
499 | ||
500 | if (size == 0) | |
501 | return 0; | |
502 | if (size > sizeof(buf)) | |
503 | size = sizeof(buf); | |
504 | if (copy_from_user(buf, input, size) != 0) | |
505 | return -EFAULT; | |
506 | ||
507 | /* Strict protocol! */ | |
508 | if (*loff != 0) | |
509 | return -ESPIPE; | |
510 | switch (*c) { | |
511 | case '/': /* flush table */ | |
512 | spin_lock_bh(&recent_lock); | |
513 | recent_table_flush(t); | |
514 | spin_unlock_bh(&recent_lock); | |
515 | return size; | |
516 | case '-': /* remove address */ | |
517 | add = false; | |
518 | break; | |
519 | case '+': /* add address */ | |
520 | add = true; | |
521 | break; | |
522 | default: | |
523 | printk(KERN_INFO KBUILD_MODNAME ": Need +ip, -ip or /\n"); | |
524 | return -EINVAL; | |
525 | } | |
526 | ||
527 | ++c; | |
528 | --size; | |
529 | if (strnchr(c, size, ':') != NULL) { | |
ee999d8b | 530 | family = NFPROTO_IPV6; |
079aa88f JE |
531 | succ = in6_pton(c, size, (void *)&addr, '\n', NULL); |
532 | } else { | |
ee999d8b | 533 | family = NFPROTO_IPV4; |
079aa88f JE |
534 | succ = in4_pton(c, size, (void *)&addr, '\n', NULL); |
535 | } | |
536 | ||
537 | if (!succ) { | |
538 | printk(KERN_INFO KBUILD_MODNAME ": illegal address written " | |
539 | "to procfs\n"); | |
540 | return -EINVAL; | |
541 | } | |
542 | ||
543 | spin_lock_bh(&recent_lock); | |
544 | e = recent_entry_lookup(t, &addr, family, 0); | |
545 | if (e == NULL) { | |
546 | if (add) | |
547 | recent_entry_init(t, &addr, family, 0); | |
548 | } else { | |
549 | if (add) | |
550 | recent_entry_update(t, e); | |
551 | else | |
552 | recent_entry_remove(t, e); | |
553 | } | |
554 | spin_unlock_bh(&recent_lock); | |
555 | /* Note we removed one above */ | |
556 | *loff += size + 1; | |
557 | return size + 1; | |
558 | } | |
559 | ||
560 | static const struct file_operations recent_mt_fops = { | |
561 | .open = recent_seq_open, | |
562 | .read = seq_read, | |
563 | .write = recent_mt_proc_write, | |
564 | .release = seq_release_private, | |
565 | .owner = THIS_MODULE, | |
566 | }; | |
7d07d563 AD |
567 | |
568 | static int __net_init recent_proc_net_init(struct net *net) | |
569 | { | |
570 | struct recent_net *recent_net = recent_pernet(net); | |
571 | ||
572 | recent_net->xt_recent = proc_mkdir("xt_recent", net->proc_net); | |
573 | if (!recent_net->xt_recent) | |
574 | return -ENOMEM; | |
7d07d563 AD |
575 | return 0; |
576 | } | |
577 | ||
578 | static void __net_exit recent_proc_net_exit(struct net *net) | |
579 | { | |
7d07d563 AD |
580 | proc_net_remove(net, "xt_recent"); |
581 | } | |
582 | #else | |
583 | static inline int recent_proc_net_init(struct net *net) | |
584 | { | |
585 | return 0; | |
586 | } | |
587 | ||
588 | static inline void recent_proc_net_exit(struct net *net) | |
589 | { | |
590 | } | |
1da177e4 | 591 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 592 | |
7d07d563 AD |
593 | static int __net_init recent_net_init(struct net *net) |
594 | { | |
595 | struct recent_net *recent_net = recent_pernet(net); | |
596 | ||
597 | INIT_LIST_HEAD(&recent_net->tables); | |
598 | return recent_proc_net_init(net); | |
599 | } | |
600 | ||
601 | static void __net_exit recent_net_exit(struct net *net) | |
602 | { | |
603 | struct recent_net *recent_net = recent_pernet(net); | |
604 | ||
605 | BUG_ON(!list_empty(&recent_net->tables)); | |
606 | recent_proc_net_exit(net); | |
607 | } | |
608 | ||
609 | static struct pernet_operations recent_net_ops = { | |
610 | .init = recent_net_init, | |
611 | .exit = recent_net_exit, | |
612 | .id = &recent_net_id, | |
613 | .size = sizeof(struct recent_net), | |
614 | }; | |
615 | ||
079aa88f JE |
616 | static struct xt_match recent_mt_reg[] __read_mostly = { |
617 | { | |
618 | .name = "recent", | |
619 | .revision = 0, | |
ee999d8b | 620 | .family = NFPROTO_IPV4, |
079aa88f JE |
621 | .match = recent_mt, |
622 | .matchsize = sizeof(struct xt_recent_mtinfo), | |
623 | .checkentry = recent_mt_check, | |
624 | .destroy = recent_mt_destroy, | |
625 | .me = THIS_MODULE, | |
626 | }, | |
627 | { | |
628 | .name = "recent", | |
629 | .revision = 0, | |
ee999d8b | 630 | .family = NFPROTO_IPV6, |
079aa88f JE |
631 | .match = recent_mt, |
632 | .matchsize = sizeof(struct xt_recent_mtinfo), | |
633 | .checkentry = recent_mt_check, | |
634 | .destroy = recent_mt_destroy, | |
635 | .me = THIS_MODULE, | |
636 | }, | |
1da177e4 LT |
637 | }; |
638 | ||
d3c5ee6d | 639 | static int __init recent_mt_init(void) |
1da177e4 | 640 | { |
404bdbfd | 641 | int err; |
1da177e4 | 642 | |
404bdbfd PM |
643 | if (!ip_list_tot || !ip_pkt_list_tot || ip_pkt_list_tot > 255) |
644 | return -EINVAL; | |
645 | ip_list_hash_size = 1 << fls(ip_list_tot); | |
1da177e4 | 646 | |
7d07d563 | 647 | err = register_pernet_subsys(&recent_net_ops); |
1da177e4 | 648 | if (err) |
404bdbfd | 649 | return err; |
7d07d563 AD |
650 | err = xt_register_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg)); |
651 | if (err) | |
652 | unregister_pernet_subsys(&recent_net_ops); | |
1da177e4 LT |
653 | return err; |
654 | } | |
655 | ||
d3c5ee6d | 656 | static void __exit recent_mt_exit(void) |
1da177e4 | 657 | { |
079aa88f | 658 | xt_unregister_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg)); |
7d07d563 | 659 | unregister_pernet_subsys(&recent_net_ops); |
1da177e4 LT |
660 | } |
661 | ||
d3c5ee6d JE |
662 | module_init(recent_mt_init); |
663 | module_exit(recent_mt_exit); |