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netfilter: xtables: move extension arguments into compound structure (1/6)
[deliverable/linux.git] / net / netfilter / xt_recent.c
1 /*
2 * Copyright (c) 2006 Patrick McHardy <kaber@trash.net>
3 * Copyright © CC Computer Consultants GmbH, 2007 - 2008
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>
16 #include <linux/ip.h>
17 #include <linux/ipv6.h>
18 #include <linux/module.h>
19 #include <linux/moduleparam.h>
20 #include <linux/proc_fs.h>
21 #include <linux/seq_file.h>
22 #include <linux/string.h>
23 #include <linux/ctype.h>
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>
30 #include <net/net_namespace.h>
31
32 #include <linux/netfilter/x_tables.h>
33 #include <linux/netfilter/xt_recent.h>
34
35 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
36 MODULE_AUTHOR("Jan Engelhardt <jengelh@computergmbh.de>");
37 MODULE_DESCRIPTION("Xtables: \"recently-seen\" host matching for IPv4");
38 MODULE_LICENSE("GPL");
39 MODULE_ALIAS("ipt_recent");
40 MODULE_ALIAS("ip6t_recent");
41
42 static unsigned int ip_list_tot = 100;
43 static unsigned int ip_pkt_list_tot = 20;
44 static unsigned int ip_list_hash_size = 0;
45 static unsigned int ip_list_perms = 0644;
46 static unsigned int ip_list_uid = 0;
47 static unsigned int ip_list_gid = 0;
48 module_param(ip_list_tot, uint, 0400);
49 module_param(ip_pkt_list_tot, uint, 0400);
50 module_param(ip_list_hash_size, uint, 0400);
51 module_param(ip_list_perms, uint, 0400);
52 module_param(ip_list_uid, uint, 0400);
53 module_param(ip_list_gid, uint, 0400);
54 MODULE_PARM_DESC(ip_list_tot, "number of IPs to remember per list");
55 MODULE_PARM_DESC(ip_pkt_list_tot, "number of packets per IP to remember (max. 255)");
56 MODULE_PARM_DESC(ip_list_hash_size, "size of hash table used to look up IPs");
57 MODULE_PARM_DESC(ip_list_perms, "permissions on /proc/net/xt_recent/* files");
58 MODULE_PARM_DESC(ip_list_uid,"owner of /proc/net/xt_recent/* files");
59 MODULE_PARM_DESC(ip_list_gid,"owning group of /proc/net/xt_recent/* files");
60
61 struct recent_entry {
62 struct list_head list;
63 struct list_head lru_list;
64 union nf_inet_addr addr;
65 u_int16_t family;
66 u_int8_t ttl;
67 u_int8_t index;
68 u_int16_t nstamps;
69 unsigned long stamps[0];
70 };
71
72 struct recent_table {
73 struct list_head list;
74 char name[XT_RECENT_NAME_LEN];
75 #ifdef CONFIG_PROC_FS
76 struct proc_dir_entry *proc_old, *proc;
77 #endif
78 unsigned int refcnt;
79 unsigned int entries;
80 struct list_head lru_list;
81 struct list_head iphash[0];
82 };
83
84 static LIST_HEAD(tables);
85 static DEFINE_SPINLOCK(recent_lock);
86 static DEFINE_MUTEX(recent_mutex);
87
88 #ifdef CONFIG_PROC_FS
89 #ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT
90 static struct proc_dir_entry *proc_old_dir;
91 #endif
92 static struct proc_dir_entry *recent_proc_dir;
93 static const struct file_operations recent_old_fops, recent_mt_fops;
94 #endif
95
96 static u_int32_t hash_rnd;
97 static bool hash_rnd_initted;
98
99 static unsigned int recent_entry_hash4(const union nf_inet_addr *addr)
100 {
101 if (!hash_rnd_initted) {
102 get_random_bytes(&hash_rnd, sizeof(hash_rnd));
103 hash_rnd_initted = true;
104 }
105 return jhash_1word((__force u32)addr->ip, hash_rnd) &
106 (ip_list_hash_size - 1);
107 }
108
109 static unsigned int recent_entry_hash6(const union nf_inet_addr *addr)
110 {
111 if (!hash_rnd_initted) {
112 get_random_bytes(&hash_rnd, sizeof(hash_rnd));
113 hash_rnd_initted = true;
114 }
115 return jhash2((u32 *)addr->ip6, ARRAY_SIZE(addr->ip6), hash_rnd) &
116 (ip_list_hash_size - 1);
117 }
118
119 static struct recent_entry *
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)
123 {
124 struct recent_entry *e;
125 unsigned int h;
126
127 if (family == NFPROTO_IPV4)
128 h = recent_entry_hash4(addrp);
129 else
130 h = recent_entry_hash6(addrp);
131
132 list_for_each_entry(e, &table->iphash[h], list)
133 if (e->family == family &&
134 memcmp(&e->addr, addrp, sizeof(e->addr)) == 0 &&
135 (ttl == e->ttl || ttl == 0 || e->ttl == 0))
136 return e;
137 return NULL;
138 }
139
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 }
147
148 static struct recent_entry *
149 recent_entry_init(struct recent_table *t, const union nf_inet_addr *addr,
150 u_int16_t family, u_int8_t ttl)
151 {
152 struct recent_entry *e;
153
154 if (t->entries >= ip_list_tot) {
155 e = list_entry(t->lru_list.next, struct recent_entry, lru_list);
156 recent_entry_remove(t, e);
157 }
158 e = kmalloc(sizeof(*e) + sizeof(e->stamps[0]) * ip_pkt_list_tot,
159 GFP_ATOMIC);
160 if (e == NULL)
161 return NULL;
162 memcpy(&e->addr, addr, sizeof(e->addr));
163 e->ttl = ttl;
164 e->stamps[0] = jiffies;
165 e->nstamps = 1;
166 e->index = 1;
167 e->family = family;
168 if (family == NFPROTO_IPV4)
169 list_add_tail(&e->list, &t->iphash[recent_entry_hash4(addr)]);
170 else
171 list_add_tail(&e->list, &t->iphash[recent_entry_hash6(addr)]);
172 list_add_tail(&e->lru_list, &t->lru_list);
173 t->entries++;
174 return e;
175 }
176
177 static void recent_entry_update(struct recent_table *t, struct recent_entry *e)
178 {
179 e->stamps[e->index++] = jiffies;
180 if (e->index > e->nstamps)
181 e->nstamps = e->index;
182 e->index %= ip_pkt_list_tot;
183 list_move_tail(&e->lru_list, &t->lru_list);
184 }
185
186 static struct recent_table *recent_table_lookup(const char *name)
187 {
188 struct recent_table *t;
189
190 list_for_each_entry(t, &tables, list)
191 if (!strcmp(t->name, name))
192 return t;
193 return NULL;
194 }
195
196 static void recent_table_flush(struct recent_table *t)
197 {
198 struct recent_entry *e, *next;
199 unsigned int i;
200
201 for (i = 0; i < ip_list_hash_size; i++)
202 list_for_each_entry_safe(e, next, &t->iphash[i], list)
203 recent_entry_remove(t, e);
204 }
205
206 static bool
207 recent_mt(const struct sk_buff *skb, const struct xt_match_param *par)
208 {
209 const struct xt_recent_mtinfo *info = par->matchinfo;
210 struct recent_table *t;
211 struct recent_entry *e;
212 union nf_inet_addr addr = {};
213 u_int8_t ttl;
214 bool ret = info->invert;
215
216 if (par->match->family == NFPROTO_IPV4) {
217 const struct iphdr *iph = ip_hdr(skb);
218
219 if (info->side == XT_RECENT_DEST)
220 addr.ip = iph->daddr;
221 else
222 addr.ip = iph->saddr;
223
224 ttl = iph->ttl;
225 } else {
226 const struct ipv6hdr *iph = ipv6_hdr(skb);
227
228 if (info->side == XT_RECENT_DEST)
229 memcpy(&addr.in6, &iph->daddr, sizeof(addr.in6));
230 else
231 memcpy(&addr.in6, &iph->saddr, sizeof(addr.in6));
232
233 ttl = iph->hop_limit;
234 }
235
236 /* use TTL as seen before forwarding */
237 if (par->out != NULL && skb->sk == NULL)
238 ttl++;
239
240 spin_lock_bh(&recent_lock);
241 t = recent_table_lookup(info->name);
242 e = recent_entry_lookup(t, &addr, par->match->family,
243 (info->check_set & XT_RECENT_TTL) ? ttl : 0);
244 if (e == NULL) {
245 if (!(info->check_set & XT_RECENT_SET))
246 goto out;
247 e = recent_entry_init(t, &addr, par->match->family, ttl);
248 if (e == NULL)
249 *par->hotdrop = true;
250 ret = !ret;
251 goto out;
252 }
253
254 if (info->check_set & XT_RECENT_SET)
255 ret = !ret;
256 else if (info->check_set & XT_RECENT_REMOVE) {
257 recent_entry_remove(t, e);
258 ret = !ret;
259 } else if (info->check_set & (XT_RECENT_CHECK | XT_RECENT_UPDATE)) {
260 unsigned long time = jiffies - info->seconds * HZ;
261 unsigned int i, hits = 0;
262
263 for (i = 0; i < e->nstamps; i++) {
264 if (info->seconds && time_after(time, e->stamps[i]))
265 continue;
266 if (++hits >= info->hit_count) {
267 ret = !ret;
268 break;
269 }
270 }
271 }
272
273 if (info->check_set & XT_RECENT_SET ||
274 (info->check_set & XT_RECENT_UPDATE && ret)) {
275 recent_entry_update(t, e);
276 e->ttl = ttl;
277 }
278 out:
279 spin_unlock_bh(&recent_lock);
280 return ret;
281 }
282
283 static bool
284 recent_mt_check(const char *tablename, const void *ip,
285 const struct xt_match *match, void *matchinfo,
286 unsigned int hook_mask)
287 {
288 const struct xt_recent_mtinfo *info = matchinfo;
289 struct recent_table *t;
290 unsigned i;
291 bool ret = false;
292
293 if (hweight8(info->check_set &
294 (XT_RECENT_SET | XT_RECENT_REMOVE |
295 XT_RECENT_CHECK | XT_RECENT_UPDATE)) != 1)
296 return false;
297 if ((info->check_set & (XT_RECENT_SET | XT_RECENT_REMOVE)) &&
298 (info->seconds || info->hit_count))
299 return false;
300 if (info->hit_count > ip_pkt_list_tot)
301 return false;
302 if (info->name[0] == '\0' ||
303 strnlen(info->name, XT_RECENT_NAME_LEN) == XT_RECENT_NAME_LEN)
304 return false;
305
306 mutex_lock(&recent_mutex);
307 t = recent_table_lookup(info->name);
308 if (t != NULL) {
309 t->refcnt++;
310 ret = true;
311 goto out;
312 }
313
314 t = kzalloc(sizeof(*t) + sizeof(t->iphash[0]) * ip_list_hash_size,
315 GFP_KERNEL);
316 if (t == NULL)
317 goto out;
318 t->refcnt = 1;
319 strcpy(t->name, info->name);
320 INIT_LIST_HEAD(&t->lru_list);
321 for (i = 0; i < ip_list_hash_size; i++)
322 INIT_LIST_HEAD(&t->iphash[i]);
323 #ifdef CONFIG_PROC_FS
324 t->proc = proc_create(t->name, ip_list_perms, recent_proc_dir,
325 &recent_mt_fops);
326 if (t->proc == NULL) {
327 kfree(t);
328 goto out;
329 }
330 #ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT
331 t->proc_old = proc_create(t->name, ip_list_perms, proc_old_dir,
332 &recent_old_fops);
333 if (t->proc_old == NULL) {
334 remove_proc_entry(t->name, proc_old_dir);
335 kfree(t);
336 goto out;
337 }
338 t->proc_old->uid = ip_list_uid;
339 t->proc_old->gid = ip_list_gid;
340 t->proc_old->data = t;
341 #endif
342 t->proc->uid = ip_list_uid;
343 t->proc->gid = ip_list_gid;
344 t->proc->data = t;
345 #endif
346 spin_lock_bh(&recent_lock);
347 list_add_tail(&t->list, &tables);
348 spin_unlock_bh(&recent_lock);
349 ret = true;
350 out:
351 mutex_unlock(&recent_mutex);
352 return ret;
353 }
354
355 static void recent_mt_destroy(const struct xt_match *match, void *matchinfo)
356 {
357 const struct xt_recent_mtinfo *info = matchinfo;
358 struct recent_table *t;
359
360 mutex_lock(&recent_mutex);
361 t = recent_table_lookup(info->name);
362 if (--t->refcnt == 0) {
363 spin_lock_bh(&recent_lock);
364 list_del(&t->list);
365 spin_unlock_bh(&recent_lock);
366 #ifdef CONFIG_PROC_FS
367 #ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT
368 remove_proc_entry(t->name, proc_old_dir);
369 #endif
370 remove_proc_entry(t->name, recent_proc_dir);
371 #endif
372 recent_table_flush(t);
373 kfree(t);
374 }
375 mutex_unlock(&recent_mutex);
376 }
377
378 #ifdef CONFIG_PROC_FS
379 struct recent_iter_state {
380 const struct recent_table *table;
381 unsigned int bucket;
382 };
383
384 static void *recent_seq_start(struct seq_file *seq, loff_t *pos)
385 __acquires(recent_lock)
386 {
387 struct recent_iter_state *st = seq->private;
388 const struct recent_table *t = st->table;
389 struct recent_entry *e;
390 loff_t p = *pos;
391
392 spin_lock_bh(&recent_lock);
393
394 for (st->bucket = 0; st->bucket < ip_list_hash_size; st->bucket++)
395 list_for_each_entry(e, &t->iphash[st->bucket], list)
396 if (p-- == 0)
397 return e;
398 return NULL;
399 }
400
401 static void *recent_seq_next(struct seq_file *seq, void *v, loff_t *pos)
402 {
403 struct recent_iter_state *st = seq->private;
404 const struct recent_table *t = st->table;
405 const struct recent_entry *e = v;
406 const struct list_head *head = e->list.next;
407
408 while (head == &t->iphash[st->bucket]) {
409 if (++st->bucket >= ip_list_hash_size)
410 return NULL;
411 head = t->iphash[st->bucket].next;
412 }
413 (*pos)++;
414 return list_entry(head, struct recent_entry, list);
415 }
416
417 static void recent_seq_stop(struct seq_file *s, void *v)
418 __releases(recent_lock)
419 {
420 spin_unlock_bh(&recent_lock);
421 }
422
423 static int recent_seq_show(struct seq_file *seq, void *v)
424 {
425 const struct recent_entry *e = v;
426 unsigned int i;
427
428 i = (e->index - 1) % ip_pkt_list_tot;
429 if (e->family == NFPROTO_IPV4)
430 seq_printf(seq, "src=" NIPQUAD_FMT " ttl: %u last_seen: %lu "
431 "oldest_pkt: %u", NIPQUAD(e->addr.ip), e->ttl,
432 e->stamps[i], e->index);
433 else
434 seq_printf(seq, "src=" NIP6_FMT " ttl: %u last_seen: %lu "
435 "oldest_pkt: %u", NIP6(e->addr.in6), e->ttl,
436 e->stamps[i], e->index);
437 for (i = 0; i < e->nstamps; i++)
438 seq_printf(seq, "%s %lu", i ? "," : "", e->stamps[i]);
439 seq_printf(seq, "\n");
440 return 0;
441 }
442
443 static const struct seq_operations recent_seq_ops = {
444 .start = recent_seq_start,
445 .next = recent_seq_next,
446 .stop = recent_seq_stop,
447 .show = recent_seq_show,
448 };
449
450 static int recent_seq_open(struct inode *inode, struct file *file)
451 {
452 struct proc_dir_entry *pde = PDE(inode);
453 struct recent_iter_state *st;
454
455 st = __seq_open_private(file, &recent_seq_ops, sizeof(*st));
456 if (st == NULL)
457 return -ENOMEM;
458
459 st->table = pde->data;
460 return 0;
461 }
462
463 #ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT
464 static int recent_old_seq_open(struct inode *inode, struct file *filp)
465 {
466 static bool warned_of_old;
467
468 if (unlikely(!warned_of_old)) {
469 printk(KERN_INFO KBUILD_MODNAME ": Use of /proc/net/ipt_recent"
470 " is deprecated; use /proc/net/xt_recent.\n");
471 warned_of_old = true;
472 }
473 return recent_seq_open(inode, filp);
474 }
475
476 static ssize_t recent_old_proc_write(struct file *file,
477 const char __user *input,
478 size_t size, loff_t *loff)
479 {
480 const struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
481 struct recent_table *t = pde->data;
482 struct recent_entry *e;
483 char buf[sizeof("+255.255.255.255")], *c = buf;
484 __be32 addr;
485 int add;
486
487 if (size > sizeof(buf))
488 size = sizeof(buf);
489 if (copy_from_user(buf, input, size))
490 return -EFAULT;
491
492 while (isspace(*c))
493 c++;
494
495 if (size - (c - buf) < 5)
496 return c - buf;
497 if (!strncmp(c, "clear", 5)) {
498 c += 5;
499 spin_lock_bh(&recent_lock);
500 recent_table_flush(t);
501 spin_unlock_bh(&recent_lock);
502 return c - buf;
503 }
504
505 switch (*c) {
506 case '-':
507 add = 0;
508 c++;
509 break;
510 case '+':
511 c++;
512 default:
513 add = 1;
514 break;
515 }
516 addr = in_aton(c);
517
518 spin_lock_bh(&recent_lock);
519 e = recent_entry_lookup(t, (const void *)&addr, NFPROTO_IPV4, 0);
520 if (e == NULL) {
521 if (add)
522 recent_entry_init(t, (const void *)&addr,
523 NFPROTO_IPV4, 0);
524 } else {
525 if (add)
526 recent_entry_update(t, e);
527 else
528 recent_entry_remove(t, e);
529 }
530 spin_unlock_bh(&recent_lock);
531 return size;
532 }
533
534 static const struct file_operations recent_old_fops = {
535 .open = recent_old_seq_open,
536 .read = seq_read,
537 .write = recent_old_proc_write,
538 .release = seq_release_private,
539 .owner = THIS_MODULE,
540 };
541 #endif
542
543 static ssize_t
544 recent_mt_proc_write(struct file *file, const char __user *input,
545 size_t size, loff_t *loff)
546 {
547 const struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
548 struct recent_table *t = pde->data;
549 struct recent_entry *e;
550 char buf[sizeof("+b335:1d35:1e55:dead:c0de:1715:5afe:c0de")];
551 const char *c = buf;
552 union nf_inet_addr addr;
553 u_int16_t family;
554 bool add, succ;
555
556 if (size == 0)
557 return 0;
558 if (size > sizeof(buf))
559 size = sizeof(buf);
560 if (copy_from_user(buf, input, size) != 0)
561 return -EFAULT;
562
563 /* Strict protocol! */
564 if (*loff != 0)
565 return -ESPIPE;
566 switch (*c) {
567 case '/': /* flush table */
568 spin_lock_bh(&recent_lock);
569 recent_table_flush(t);
570 spin_unlock_bh(&recent_lock);
571 return size;
572 case '-': /* remove address */
573 add = false;
574 break;
575 case '+': /* add address */
576 add = true;
577 break;
578 default:
579 printk(KERN_INFO KBUILD_MODNAME ": Need +ip, -ip or /\n");
580 return -EINVAL;
581 }
582
583 ++c;
584 --size;
585 if (strnchr(c, size, ':') != NULL) {
586 family = NFPROTO_IPV6;
587 succ = in6_pton(c, size, (void *)&addr, '\n', NULL);
588 } else {
589 family = NFPROTO_IPV4;
590 succ = in4_pton(c, size, (void *)&addr, '\n', NULL);
591 }
592
593 if (!succ) {
594 printk(KERN_INFO KBUILD_MODNAME ": illegal address written "
595 "to procfs\n");
596 return -EINVAL;
597 }
598
599 spin_lock_bh(&recent_lock);
600 e = recent_entry_lookup(t, &addr, family, 0);
601 if (e == NULL) {
602 if (add)
603 recent_entry_init(t, &addr, family, 0);
604 } else {
605 if (add)
606 recent_entry_update(t, e);
607 else
608 recent_entry_remove(t, e);
609 }
610 spin_unlock_bh(&recent_lock);
611 /* Note we removed one above */
612 *loff += size + 1;
613 return size + 1;
614 }
615
616 static const struct file_operations recent_mt_fops = {
617 .open = recent_seq_open,
618 .read = seq_read,
619 .write = recent_mt_proc_write,
620 .release = seq_release_private,
621 .owner = THIS_MODULE,
622 };
623 #endif /* CONFIG_PROC_FS */
624
625 static struct xt_match recent_mt_reg[] __read_mostly = {
626 {
627 .name = "recent",
628 .revision = 0,
629 .family = NFPROTO_IPV4,
630 .match = recent_mt,
631 .matchsize = sizeof(struct xt_recent_mtinfo),
632 .checkentry = recent_mt_check,
633 .destroy = recent_mt_destroy,
634 .me = THIS_MODULE,
635 },
636 {
637 .name = "recent",
638 .revision = 0,
639 .family = NFPROTO_IPV6,
640 .match = recent_mt,
641 .matchsize = sizeof(struct xt_recent_mtinfo),
642 .checkentry = recent_mt_check,
643 .destroy = recent_mt_destroy,
644 .me = THIS_MODULE,
645 },
646 };
647
648 static int __init recent_mt_init(void)
649 {
650 int err;
651
652 if (!ip_list_tot || !ip_pkt_list_tot || ip_pkt_list_tot > 255)
653 return -EINVAL;
654 ip_list_hash_size = 1 << fls(ip_list_tot);
655
656 err = xt_register_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg));
657 #ifdef CONFIG_PROC_FS
658 if (err)
659 return err;
660 recent_proc_dir = proc_mkdir("xt_recent", init_net.proc_net);
661 if (recent_proc_dir == NULL) {
662 xt_unregister_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg));
663 err = -ENOMEM;
664 }
665 #ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT
666 if (err < 0)
667 return err;
668 proc_old_dir = proc_mkdir("ipt_recent", init_net.proc_net);
669 if (proc_old_dir == NULL) {
670 remove_proc_entry("xt_recent", init_net.proc_net);
671 xt_unregister_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg));
672 err = -ENOMEM;
673 }
674 #endif
675 #endif
676 return err;
677 }
678
679 static void __exit recent_mt_exit(void)
680 {
681 BUG_ON(!list_empty(&tables));
682 xt_unregister_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg));
683 #ifdef CONFIG_PROC_FS
684 #ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT
685 remove_proc_entry("ipt_recent", init_net.proc_net);
686 #endif
687 remove_proc_entry("xt_recent", init_net.proc_net);
688 #endif
689 }
690
691 module_init(recent_mt_init);
692 module_exit(recent_mt_exit);
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