add POSIX clocks and timers maintainer
[usb.git] / net / netfilter / x_tables.c
blobcc2baa6d5a7ac5d75d6a9ec3686e755787dc64ff
1 /*
2 * x_tables core - Backend for {ip,ip6,arp}_tables
4 * Copyright (C) 2006-2006 Harald Welte <laforge@netfilter.org>
6 * Based on existing ip_tables code which is
7 * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
8 * Copyright (C) 2000-2005 Netfilter Core Team <coreteam@netfilter.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
16 #include <linux/kernel.h>
17 #include <linux/socket.h>
18 #include <linux/net.h>
19 #include <linux/proc_fs.h>
20 #include <linux/seq_file.h>
21 #include <linux/string.h>
22 #include <linux/vmalloc.h>
23 #include <linux/mutex.h>
24 #include <linux/mm.h>
26 #include <linux/netfilter/x_tables.h>
27 #include <linux/netfilter_arp.h>
30 MODULE_LICENSE("GPL");
31 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
32 MODULE_DESCRIPTION("[ip,ip6,arp]_tables backend module");
34 #define SMP_ALIGN(x) (((x) + SMP_CACHE_BYTES-1) & ~(SMP_CACHE_BYTES-1))
36 struct xt_af {
37 struct mutex mutex;
38 struct list_head match;
39 struct list_head target;
40 struct list_head tables;
41 struct mutex compat_mutex;
44 static struct xt_af *xt;
46 #ifdef DEBUG_IP_FIREWALL_USER
47 #define duprintf(format, args...) printk(format , ## args)
48 #else
49 #define duprintf(format, args...)
50 #endif
52 enum {
53 TABLE,
54 TARGET,
55 MATCH,
58 static const char *xt_prefix[NPROTO] = {
59 [AF_INET] = "ip",
60 [AF_INET6] = "ip6",
61 [NF_ARP] = "arp",
64 /* Registration hooks for targets. */
65 int
66 xt_register_target(struct xt_target *target)
68 int ret, af = target->family;
70 ret = mutex_lock_interruptible(&xt[af].mutex);
71 if (ret != 0)
72 return ret;
73 list_add(&target->list, &xt[af].target);
74 mutex_unlock(&xt[af].mutex);
75 return ret;
77 EXPORT_SYMBOL(xt_register_target);
79 void
80 xt_unregister_target(struct xt_target *target)
82 int af = target->family;
84 mutex_lock(&xt[af].mutex);
85 list_del(&target->list);
86 mutex_unlock(&xt[af].mutex);
88 EXPORT_SYMBOL(xt_unregister_target);
90 int
91 xt_register_targets(struct xt_target *target, unsigned int n)
93 unsigned int i;
94 int err = 0;
96 for (i = 0; i < n; i++) {
97 err = xt_register_target(&target[i]);
98 if (err)
99 goto err;
101 return err;
103 err:
104 if (i > 0)
105 xt_unregister_targets(target, i);
106 return err;
108 EXPORT_SYMBOL(xt_register_targets);
110 void
111 xt_unregister_targets(struct xt_target *target, unsigned int n)
113 unsigned int i;
115 for (i = 0; i < n; i++)
116 xt_unregister_target(&target[i]);
118 EXPORT_SYMBOL(xt_unregister_targets);
121 xt_register_match(struct xt_match *match)
123 int ret, af = match->family;
125 ret = mutex_lock_interruptible(&xt[af].mutex);
126 if (ret != 0)
127 return ret;
129 list_add(&match->list, &xt[af].match);
130 mutex_unlock(&xt[af].mutex);
132 return ret;
134 EXPORT_SYMBOL(xt_register_match);
136 void
137 xt_unregister_match(struct xt_match *match)
139 int af = match->family;
141 mutex_lock(&xt[af].mutex);
142 list_del(&match->list);
143 mutex_unlock(&xt[af].mutex);
145 EXPORT_SYMBOL(xt_unregister_match);
148 xt_register_matches(struct xt_match *match, unsigned int n)
150 unsigned int i;
151 int err = 0;
153 for (i = 0; i < n; i++) {
154 err = xt_register_match(&match[i]);
155 if (err)
156 goto err;
158 return err;
160 err:
161 if (i > 0)
162 xt_unregister_matches(match, i);
163 return err;
165 EXPORT_SYMBOL(xt_register_matches);
167 void
168 xt_unregister_matches(struct xt_match *match, unsigned int n)
170 unsigned int i;
172 for (i = 0; i < n; i++)
173 xt_unregister_match(&match[i]);
175 EXPORT_SYMBOL(xt_unregister_matches);
179 * These are weird, but module loading must not be done with mutex
180 * held (since they will register), and we have to have a single
181 * function to use try_then_request_module().
184 /* Find match, grabs ref. Returns ERR_PTR() on error. */
185 struct xt_match *xt_find_match(int af, const char *name, u8 revision)
187 struct xt_match *m;
188 int err = 0;
190 if (mutex_lock_interruptible(&xt[af].mutex) != 0)
191 return ERR_PTR(-EINTR);
193 list_for_each_entry(m, &xt[af].match, list) {
194 if (strcmp(m->name, name) == 0) {
195 if (m->revision == revision) {
196 if (try_module_get(m->me)) {
197 mutex_unlock(&xt[af].mutex);
198 return m;
200 } else
201 err = -EPROTOTYPE; /* Found something. */
204 mutex_unlock(&xt[af].mutex);
205 return ERR_PTR(err);
207 EXPORT_SYMBOL(xt_find_match);
209 /* Find target, grabs ref. Returns ERR_PTR() on error. */
210 struct xt_target *xt_find_target(int af, const char *name, u8 revision)
212 struct xt_target *t;
213 int err = 0;
215 if (mutex_lock_interruptible(&xt[af].mutex) != 0)
216 return ERR_PTR(-EINTR);
218 list_for_each_entry(t, &xt[af].target, list) {
219 if (strcmp(t->name, name) == 0) {
220 if (t->revision == revision) {
221 if (try_module_get(t->me)) {
222 mutex_unlock(&xt[af].mutex);
223 return t;
225 } else
226 err = -EPROTOTYPE; /* Found something. */
229 mutex_unlock(&xt[af].mutex);
230 return ERR_PTR(err);
232 EXPORT_SYMBOL(xt_find_target);
234 struct xt_target *xt_request_find_target(int af, const char *name, u8 revision)
236 struct xt_target *target;
238 target = try_then_request_module(xt_find_target(af, name, revision),
239 "%st_%s", xt_prefix[af], name);
240 if (IS_ERR(target) || !target)
241 return NULL;
242 return target;
244 EXPORT_SYMBOL_GPL(xt_request_find_target);
246 static int match_revfn(int af, const char *name, u8 revision, int *bestp)
248 struct xt_match *m;
249 int have_rev = 0;
251 list_for_each_entry(m, &xt[af].match, list) {
252 if (strcmp(m->name, name) == 0) {
253 if (m->revision > *bestp)
254 *bestp = m->revision;
255 if (m->revision == revision)
256 have_rev = 1;
259 return have_rev;
262 static int target_revfn(int af, const char *name, u8 revision, int *bestp)
264 struct xt_target *t;
265 int have_rev = 0;
267 list_for_each_entry(t, &xt[af].target, list) {
268 if (strcmp(t->name, name) == 0) {
269 if (t->revision > *bestp)
270 *bestp = t->revision;
271 if (t->revision == revision)
272 have_rev = 1;
275 return have_rev;
278 /* Returns true or false (if no such extension at all) */
279 int xt_find_revision(int af, const char *name, u8 revision, int target,
280 int *err)
282 int have_rev, best = -1;
284 if (mutex_lock_interruptible(&xt[af].mutex) != 0) {
285 *err = -EINTR;
286 return 1;
288 if (target == 1)
289 have_rev = target_revfn(af, name, revision, &best);
290 else
291 have_rev = match_revfn(af, name, revision, &best);
292 mutex_unlock(&xt[af].mutex);
294 /* Nothing at all? Return 0 to try loading module. */
295 if (best == -1) {
296 *err = -ENOENT;
297 return 0;
300 *err = best;
301 if (!have_rev)
302 *err = -EPROTONOSUPPORT;
303 return 1;
305 EXPORT_SYMBOL_GPL(xt_find_revision);
307 int xt_check_match(const struct xt_match *match, unsigned short family,
308 unsigned int size, const char *table, unsigned int hook_mask,
309 unsigned short proto, int inv_proto)
311 if (XT_ALIGN(match->matchsize) != size) {
312 printk("%s_tables: %s match: invalid size %Zu != %u\n",
313 xt_prefix[family], match->name,
314 XT_ALIGN(match->matchsize), size);
315 return -EINVAL;
317 if (match->table && strcmp(match->table, table)) {
318 printk("%s_tables: %s match: only valid in %s table, not %s\n",
319 xt_prefix[family], match->name, match->table, table);
320 return -EINVAL;
322 if (match->hooks && (hook_mask & ~match->hooks) != 0) {
323 printk("%s_tables: %s match: bad hook_mask %u/%u\n",
324 xt_prefix[family], match->name, hook_mask, match->hooks);
325 return -EINVAL;
327 if (match->proto && (match->proto != proto || inv_proto)) {
328 printk("%s_tables: %s match: only valid for protocol %u\n",
329 xt_prefix[family], match->name, match->proto);
330 return -EINVAL;
332 return 0;
334 EXPORT_SYMBOL_GPL(xt_check_match);
336 #ifdef CONFIG_COMPAT
337 int xt_compat_match_offset(struct xt_match *match)
339 u_int16_t csize = match->compatsize ? : match->matchsize;
340 return XT_ALIGN(match->matchsize) - COMPAT_XT_ALIGN(csize);
342 EXPORT_SYMBOL_GPL(xt_compat_match_offset);
344 void xt_compat_match_from_user(struct xt_entry_match *m, void **dstptr,
345 int *size)
347 struct xt_match *match = m->u.kernel.match;
348 struct compat_xt_entry_match *cm = (struct compat_xt_entry_match *)m;
349 int pad, off = xt_compat_match_offset(match);
350 u_int16_t msize = cm->u.user.match_size;
352 m = *dstptr;
353 memcpy(m, cm, sizeof(*cm));
354 if (match->compat_from_user)
355 match->compat_from_user(m->data, cm->data);
356 else
357 memcpy(m->data, cm->data, msize - sizeof(*cm));
358 pad = XT_ALIGN(match->matchsize) - match->matchsize;
359 if (pad > 0)
360 memset(m->data + match->matchsize, 0, pad);
362 msize += off;
363 m->u.user.match_size = msize;
365 *size += off;
366 *dstptr += msize;
368 EXPORT_SYMBOL_GPL(xt_compat_match_from_user);
370 int xt_compat_match_to_user(struct xt_entry_match *m, void __user **dstptr,
371 int *size)
373 struct xt_match *match = m->u.kernel.match;
374 struct compat_xt_entry_match __user *cm = *dstptr;
375 int off = xt_compat_match_offset(match);
376 u_int16_t msize = m->u.user.match_size - off;
378 if (copy_to_user(cm, m, sizeof(*cm)) ||
379 put_user(msize, &cm->u.user.match_size))
380 return -EFAULT;
382 if (match->compat_to_user) {
383 if (match->compat_to_user((void __user *)cm->data, m->data))
384 return -EFAULT;
385 } else {
386 if (copy_to_user(cm->data, m->data, msize - sizeof(*cm)))
387 return -EFAULT;
390 *size -= off;
391 *dstptr += msize;
392 return 0;
394 EXPORT_SYMBOL_GPL(xt_compat_match_to_user);
395 #endif /* CONFIG_COMPAT */
397 int xt_check_target(const struct xt_target *target, unsigned short family,
398 unsigned int size, const char *table, unsigned int hook_mask,
399 unsigned short proto, int inv_proto)
401 if (XT_ALIGN(target->targetsize) != size) {
402 printk("%s_tables: %s target: invalid size %Zu != %u\n",
403 xt_prefix[family], target->name,
404 XT_ALIGN(target->targetsize), size);
405 return -EINVAL;
407 if (target->table && strcmp(target->table, table)) {
408 printk("%s_tables: %s target: only valid in %s table, not %s\n",
409 xt_prefix[family], target->name, target->table, table);
410 return -EINVAL;
412 if (target->hooks && (hook_mask & ~target->hooks) != 0) {
413 printk("%s_tables: %s target: bad hook_mask %u/%u\n",
414 xt_prefix[family], target->name, hook_mask,
415 target->hooks);
416 return -EINVAL;
418 if (target->proto && (target->proto != proto || inv_proto)) {
419 printk("%s_tables: %s target: only valid for protocol %u\n",
420 xt_prefix[family], target->name, target->proto);
421 return -EINVAL;
423 return 0;
425 EXPORT_SYMBOL_GPL(xt_check_target);
427 #ifdef CONFIG_COMPAT
428 int xt_compat_target_offset(struct xt_target *target)
430 u_int16_t csize = target->compatsize ? : target->targetsize;
431 return XT_ALIGN(target->targetsize) - COMPAT_XT_ALIGN(csize);
433 EXPORT_SYMBOL_GPL(xt_compat_target_offset);
435 void xt_compat_target_from_user(struct xt_entry_target *t, void **dstptr,
436 int *size)
438 struct xt_target *target = t->u.kernel.target;
439 struct compat_xt_entry_target *ct = (struct compat_xt_entry_target *)t;
440 int pad, off = xt_compat_target_offset(target);
441 u_int16_t tsize = ct->u.user.target_size;
443 t = *dstptr;
444 memcpy(t, ct, sizeof(*ct));
445 if (target->compat_from_user)
446 target->compat_from_user(t->data, ct->data);
447 else
448 memcpy(t->data, ct->data, tsize - sizeof(*ct));
449 pad = XT_ALIGN(target->targetsize) - target->targetsize;
450 if (pad > 0)
451 memset(t->data + target->targetsize, 0, pad);
453 tsize += off;
454 t->u.user.target_size = tsize;
456 *size += off;
457 *dstptr += tsize;
459 EXPORT_SYMBOL_GPL(xt_compat_target_from_user);
461 int xt_compat_target_to_user(struct xt_entry_target *t, void __user **dstptr,
462 int *size)
464 struct xt_target *target = t->u.kernel.target;
465 struct compat_xt_entry_target __user *ct = *dstptr;
466 int off = xt_compat_target_offset(target);
467 u_int16_t tsize = t->u.user.target_size - off;
469 if (copy_to_user(ct, t, sizeof(*ct)) ||
470 put_user(tsize, &ct->u.user.target_size))
471 return -EFAULT;
473 if (target->compat_to_user) {
474 if (target->compat_to_user((void __user *)ct->data, t->data))
475 return -EFAULT;
476 } else {
477 if (copy_to_user(ct->data, t->data, tsize - sizeof(*ct)))
478 return -EFAULT;
481 *size -= off;
482 *dstptr += tsize;
483 return 0;
485 EXPORT_SYMBOL_GPL(xt_compat_target_to_user);
486 #endif
488 struct xt_table_info *xt_alloc_table_info(unsigned int size)
490 struct xt_table_info *newinfo;
491 int cpu;
493 /* Pedantry: prevent them from hitting BUG() in vmalloc.c --RR */
494 if ((SMP_ALIGN(size) >> PAGE_SHIFT) + 2 > num_physpages)
495 return NULL;
497 newinfo = kzalloc(sizeof(struct xt_table_info), GFP_KERNEL);
498 if (!newinfo)
499 return NULL;
501 newinfo->size = size;
503 for_each_possible_cpu(cpu) {
504 if (size <= PAGE_SIZE)
505 newinfo->entries[cpu] = kmalloc_node(size,
506 GFP_KERNEL,
507 cpu_to_node(cpu));
508 else
509 newinfo->entries[cpu] = vmalloc_node(size,
510 cpu_to_node(cpu));
512 if (newinfo->entries[cpu] == NULL) {
513 xt_free_table_info(newinfo);
514 return NULL;
518 return newinfo;
520 EXPORT_SYMBOL(xt_alloc_table_info);
522 void xt_free_table_info(struct xt_table_info *info)
524 int cpu;
526 for_each_possible_cpu(cpu) {
527 if (info->size <= PAGE_SIZE)
528 kfree(info->entries[cpu]);
529 else
530 vfree(info->entries[cpu]);
532 kfree(info);
534 EXPORT_SYMBOL(xt_free_table_info);
536 /* Find table by name, grabs mutex & ref. Returns ERR_PTR() on error. */
537 struct xt_table *xt_find_table_lock(int af, const char *name)
539 struct xt_table *t;
541 if (mutex_lock_interruptible(&xt[af].mutex) != 0)
542 return ERR_PTR(-EINTR);
544 list_for_each_entry(t, &xt[af].tables, list)
545 if (strcmp(t->name, name) == 0 && try_module_get(t->me))
546 return t;
547 mutex_unlock(&xt[af].mutex);
548 return NULL;
550 EXPORT_SYMBOL_GPL(xt_find_table_lock);
552 void xt_table_unlock(struct xt_table *table)
554 mutex_unlock(&xt[table->af].mutex);
556 EXPORT_SYMBOL_GPL(xt_table_unlock);
558 #ifdef CONFIG_COMPAT
559 void xt_compat_lock(int af)
561 mutex_lock(&xt[af].compat_mutex);
563 EXPORT_SYMBOL_GPL(xt_compat_lock);
565 void xt_compat_unlock(int af)
567 mutex_unlock(&xt[af].compat_mutex);
569 EXPORT_SYMBOL_GPL(xt_compat_unlock);
570 #endif
572 struct xt_table_info *
573 xt_replace_table(struct xt_table *table,
574 unsigned int num_counters,
575 struct xt_table_info *newinfo,
576 int *error)
578 struct xt_table_info *oldinfo, *private;
580 /* Do the substitution. */
581 write_lock_bh(&table->lock);
582 private = table->private;
583 /* Check inside lock: is the old number correct? */
584 if (num_counters != private->number) {
585 duprintf("num_counters != table->private->number (%u/%u)\n",
586 num_counters, private->number);
587 write_unlock_bh(&table->lock);
588 *error = -EAGAIN;
589 return NULL;
591 oldinfo = private;
592 table->private = newinfo;
593 newinfo->initial_entries = oldinfo->initial_entries;
594 write_unlock_bh(&table->lock);
596 return oldinfo;
598 EXPORT_SYMBOL_GPL(xt_replace_table);
600 int xt_register_table(struct xt_table *table,
601 struct xt_table_info *bootstrap,
602 struct xt_table_info *newinfo)
604 int ret;
605 struct xt_table_info *private;
606 struct xt_table *t;
608 ret = mutex_lock_interruptible(&xt[table->af].mutex);
609 if (ret != 0)
610 return ret;
612 /* Don't autoload: we'd eat our tail... */
613 list_for_each_entry(t, &xt[table->af].tables, list) {
614 if (strcmp(t->name, table->name) == 0) {
615 ret = -EEXIST;
616 goto unlock;
620 /* Simplifies replace_table code. */
621 table->private = bootstrap;
622 rwlock_init(&table->lock);
623 if (!xt_replace_table(table, 0, newinfo, &ret))
624 goto unlock;
626 private = table->private;
627 duprintf("table->private->number = %u\n", private->number);
629 /* save number of initial entries */
630 private->initial_entries = private->number;
632 list_add(&table->list, &xt[table->af].tables);
634 ret = 0;
635 unlock:
636 mutex_unlock(&xt[table->af].mutex);
637 return ret;
639 EXPORT_SYMBOL_GPL(xt_register_table);
641 void *xt_unregister_table(struct xt_table *table)
643 struct xt_table_info *private;
645 mutex_lock(&xt[table->af].mutex);
646 private = table->private;
647 list_del(&table->list);
648 mutex_unlock(&xt[table->af].mutex);
650 return private;
652 EXPORT_SYMBOL_GPL(xt_unregister_table);
654 #ifdef CONFIG_PROC_FS
655 static struct list_head *xt_get_idx(struct list_head *list, struct seq_file *seq, loff_t pos)
657 struct list_head *head = list->next;
659 if (!head || list_empty(list))
660 return NULL;
662 while (pos && (head = head->next)) {
663 if (head == list)
664 return NULL;
665 pos--;
667 return pos ? NULL : head;
670 static struct list_head *type2list(u_int16_t af, u_int16_t type)
672 struct list_head *list;
674 switch (type) {
675 case TARGET:
676 list = &xt[af].target;
677 break;
678 case MATCH:
679 list = &xt[af].match;
680 break;
681 case TABLE:
682 list = &xt[af].tables;
683 break;
684 default:
685 list = NULL;
686 break;
689 return list;
692 static void *xt_tgt_seq_start(struct seq_file *seq, loff_t *pos)
694 struct proc_dir_entry *pde = (struct proc_dir_entry *) seq->private;
695 u_int16_t af = (unsigned long)pde->data & 0xffff;
696 u_int16_t type = (unsigned long)pde->data >> 16;
697 struct list_head *list;
699 if (af >= NPROTO)
700 return NULL;
702 list = type2list(af, type);
703 if (!list)
704 return NULL;
706 if (mutex_lock_interruptible(&xt[af].mutex) != 0)
707 return NULL;
709 return xt_get_idx(list, seq, *pos);
712 static void *xt_tgt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
714 struct proc_dir_entry *pde = seq->private;
715 u_int16_t af = (unsigned long)pde->data & 0xffff;
716 u_int16_t type = (unsigned long)pde->data >> 16;
717 struct list_head *list;
719 if (af >= NPROTO)
720 return NULL;
722 list = type2list(af, type);
723 if (!list)
724 return NULL;
726 (*pos)++;
727 return xt_get_idx(list, seq, *pos);
730 static void xt_tgt_seq_stop(struct seq_file *seq, void *v)
732 struct proc_dir_entry *pde = seq->private;
733 u_int16_t af = (unsigned long)pde->data & 0xffff;
735 mutex_unlock(&xt[af].mutex);
738 static int xt_name_seq_show(struct seq_file *seq, void *v)
740 char *name = (char *)v + sizeof(struct list_head);
742 if (strlen(name))
743 return seq_printf(seq, "%s\n", name);
744 else
745 return 0;
748 static const struct seq_operations xt_tgt_seq_ops = {
749 .start = xt_tgt_seq_start,
750 .next = xt_tgt_seq_next,
751 .stop = xt_tgt_seq_stop,
752 .show = xt_name_seq_show,
755 static int xt_tgt_open(struct inode *inode, struct file *file)
757 int ret;
759 ret = seq_open(file, &xt_tgt_seq_ops);
760 if (!ret) {
761 struct seq_file *seq = file->private_data;
762 struct proc_dir_entry *pde = PDE(inode);
764 seq->private = pde;
767 return ret;
770 static const struct file_operations xt_file_ops = {
771 .owner = THIS_MODULE,
772 .open = xt_tgt_open,
773 .read = seq_read,
774 .llseek = seq_lseek,
775 .release = seq_release,
778 #define FORMAT_TABLES "_tables_names"
779 #define FORMAT_MATCHES "_tables_matches"
780 #define FORMAT_TARGETS "_tables_targets"
782 #endif /* CONFIG_PROC_FS */
784 int xt_proto_init(int af)
786 #ifdef CONFIG_PROC_FS
787 char buf[XT_FUNCTION_MAXNAMELEN];
788 struct proc_dir_entry *proc;
789 #endif
791 if (af >= NPROTO)
792 return -EINVAL;
795 #ifdef CONFIG_PROC_FS
796 strlcpy(buf, xt_prefix[af], sizeof(buf));
797 strlcat(buf, FORMAT_TABLES, sizeof(buf));
798 proc = proc_net_fops_create(buf, 0440, &xt_file_ops);
799 if (!proc)
800 goto out;
801 proc->data = (void *) ((unsigned long) af | (TABLE << 16));
804 strlcpy(buf, xt_prefix[af], sizeof(buf));
805 strlcat(buf, FORMAT_MATCHES, sizeof(buf));
806 proc = proc_net_fops_create(buf, 0440, &xt_file_ops);
807 if (!proc)
808 goto out_remove_tables;
809 proc->data = (void *) ((unsigned long) af | (MATCH << 16));
811 strlcpy(buf, xt_prefix[af], sizeof(buf));
812 strlcat(buf, FORMAT_TARGETS, sizeof(buf));
813 proc = proc_net_fops_create(buf, 0440, &xt_file_ops);
814 if (!proc)
815 goto out_remove_matches;
816 proc->data = (void *) ((unsigned long) af | (TARGET << 16));
817 #endif
819 return 0;
821 #ifdef CONFIG_PROC_FS
822 out_remove_matches:
823 strlcpy(buf, xt_prefix[af], sizeof(buf));
824 strlcat(buf, FORMAT_MATCHES, sizeof(buf));
825 proc_net_remove(buf);
827 out_remove_tables:
828 strlcpy(buf, xt_prefix[af], sizeof(buf));
829 strlcat(buf, FORMAT_TABLES, sizeof(buf));
830 proc_net_remove(buf);
831 out:
832 return -1;
833 #endif
835 EXPORT_SYMBOL_GPL(xt_proto_init);
837 void xt_proto_fini(int af)
839 #ifdef CONFIG_PROC_FS
840 char buf[XT_FUNCTION_MAXNAMELEN];
842 strlcpy(buf, xt_prefix[af], sizeof(buf));
843 strlcat(buf, FORMAT_TABLES, sizeof(buf));
844 proc_net_remove(buf);
846 strlcpy(buf, xt_prefix[af], sizeof(buf));
847 strlcat(buf, FORMAT_TARGETS, sizeof(buf));
848 proc_net_remove(buf);
850 strlcpy(buf, xt_prefix[af], sizeof(buf));
851 strlcat(buf, FORMAT_MATCHES, sizeof(buf));
852 proc_net_remove(buf);
853 #endif /*CONFIG_PROC_FS*/
855 EXPORT_SYMBOL_GPL(xt_proto_fini);
858 static int __init xt_init(void)
860 int i;
862 xt = kmalloc(sizeof(struct xt_af) * NPROTO, GFP_KERNEL);
863 if (!xt)
864 return -ENOMEM;
866 for (i = 0; i < NPROTO; i++) {
867 mutex_init(&xt[i].mutex);
868 #ifdef CONFIG_COMPAT
869 mutex_init(&xt[i].compat_mutex);
870 #endif
871 INIT_LIST_HEAD(&xt[i].target);
872 INIT_LIST_HEAD(&xt[i].match);
873 INIT_LIST_HEAD(&xt[i].tables);
875 return 0;
878 static void __exit xt_fini(void)
880 kfree(xt);
883 module_init(xt_init);
884 module_exit(xt_fini);