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>
25 #include <net/net_namespace.h>
27 #include <linux/netfilter/x_tables.h>
28 #include <linux/netfilter_arp.h>
31 MODULE_LICENSE("GPL");
32 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
33 MODULE_DESCRIPTION("[ip,ip6,arp]_tables backend module");
35 #define SMP_ALIGN(x) (((x) + SMP_CACHE_BYTES-1) & ~(SMP_CACHE_BYTES-1))
38 struct compat_delta *next;
45 struct list_head match;
46 struct list_head target;
48 struct mutex compat_mutex;
49 struct compat_delta *compat_offsets;
53 static struct xt_af *xt;
55 #ifdef DEBUG_IP_FIREWALL_USER
56 #define duprintf(format, args...) printk(format , ## args)
58 #define duprintf(format, args...)
61 static const char *const xt_prefix[NFPROTO_NUMPROTO] = {
62 [NFPROTO_UNSPEC] = "x",
63 [NFPROTO_IPV4] = "ip",
64 [NFPROTO_ARP] = "arp",
65 [NFPROTO_BRIDGE] = "eb",
66 [NFPROTO_IPV6] = "ip6",
69 /* Registration hooks for targets. */
71 xt_register_target(struct xt_target *target)
73 u_int8_t af = target->family;
76 ret = mutex_lock_interruptible(&xt[af].mutex);
79 list_add(&target->list, &xt[af].target);
80 mutex_unlock(&xt[af].mutex);
83 EXPORT_SYMBOL(xt_register_target);
86 xt_unregister_target(struct xt_target *target)
88 u_int8_t af = target->family;
90 mutex_lock(&xt[af].mutex);
91 list_del(&target->list);
92 mutex_unlock(&xt[af].mutex);
94 EXPORT_SYMBOL(xt_unregister_target);
97 xt_register_targets(struct xt_target *target, unsigned int n)
102 for (i = 0; i < n; i++) {
103 err = xt_register_target(&target[i]);
111 xt_unregister_targets(target, i);
114 EXPORT_SYMBOL(xt_register_targets);
117 xt_unregister_targets(struct xt_target *target, unsigned int n)
121 for (i = 0; i < n; i++)
122 xt_unregister_target(&target[i]);
124 EXPORT_SYMBOL(xt_unregister_targets);
127 xt_register_match(struct xt_match *match)
129 u_int8_t af = match->family;
132 ret = mutex_lock_interruptible(&xt[af].mutex);
136 list_add(&match->list, &xt[af].match);
137 mutex_unlock(&xt[af].mutex);
141 EXPORT_SYMBOL(xt_register_match);
144 xt_unregister_match(struct xt_match *match)
146 u_int8_t af = match->family;
148 mutex_lock(&xt[af].mutex);
149 list_del(&match->list);
150 mutex_unlock(&xt[af].mutex);
152 EXPORT_SYMBOL(xt_unregister_match);
155 xt_register_matches(struct xt_match *match, unsigned int n)
160 for (i = 0; i < n; i++) {
161 err = xt_register_match(&match[i]);
169 xt_unregister_matches(match, i);
172 EXPORT_SYMBOL(xt_register_matches);
175 xt_unregister_matches(struct xt_match *match, unsigned int n)
179 for (i = 0; i < n; i++)
180 xt_unregister_match(&match[i]);
182 EXPORT_SYMBOL(xt_unregister_matches);
186 * These are weird, but module loading must not be done with mutex
187 * held (since they will register), and we have to have a single
188 * function to use try_then_request_module().
191 /* Find match, grabs ref. Returns ERR_PTR() on error. */
192 struct xt_match *xt_find_match(u8 af, const char *name, u8 revision)
197 if (mutex_lock_interruptible(&xt[af].mutex) != 0)
198 return ERR_PTR(-EINTR);
200 list_for_each_entry(m, &xt[af].match, list) {
201 if (strcmp(m->name, name) == 0) {
202 if (m->revision == revision) {
203 if (try_module_get(m->me)) {
204 mutex_unlock(&xt[af].mutex);
208 err = -EPROTOTYPE; /* Found something. */
211 mutex_unlock(&xt[af].mutex);
214 EXPORT_SYMBOL(xt_find_match);
216 /* Find target, grabs ref. Returns ERR_PTR() on error. */
217 struct xt_target *xt_find_target(u8 af, const char *name, u8 revision)
222 if (mutex_lock_interruptible(&xt[af].mutex) != 0)
223 return ERR_PTR(-EINTR);
225 list_for_each_entry(t, &xt[af].target, list) {
226 if (strcmp(t->name, name) == 0) {
227 if (t->revision == revision) {
228 if (try_module_get(t->me)) {
229 mutex_unlock(&xt[af].mutex);
233 err = -EPROTOTYPE; /* Found something. */
236 mutex_unlock(&xt[af].mutex);
239 EXPORT_SYMBOL(xt_find_target);
241 struct xt_target *xt_request_find_target(u8 af, const char *name, u8 revision)
243 struct xt_target *target;
245 target = try_then_request_module(xt_find_target(af, name, revision),
246 "%st_%s", xt_prefix[af], name);
247 if (IS_ERR(target) || !target)
251 EXPORT_SYMBOL_GPL(xt_request_find_target);
253 static int match_revfn(u8 af, const char *name, u8 revision, int *bestp)
255 const struct xt_match *m;
258 list_for_each_entry(m, &xt[af].match, list) {
259 if (strcmp(m->name, name) == 0) {
260 if (m->revision > *bestp)
261 *bestp = m->revision;
262 if (m->revision == revision)
269 static int target_revfn(u8 af, const char *name, u8 revision, int *bestp)
271 const struct xt_target *t;
274 list_for_each_entry(t, &xt[af].target, list) {
275 if (strcmp(t->name, name) == 0) {
276 if (t->revision > *bestp)
277 *bestp = t->revision;
278 if (t->revision == revision)
285 /* Returns true or false (if no such extension at all) */
286 int xt_find_revision(u8 af, const char *name, u8 revision, int target,
289 int have_rev, best = -1;
291 if (mutex_lock_interruptible(&xt[af].mutex) != 0) {
296 have_rev = target_revfn(af, name, revision, &best);
298 have_rev = match_revfn(af, name, revision, &best);
299 mutex_unlock(&xt[af].mutex);
301 /* Nothing at all? Return 0 to try loading module. */
309 *err = -EPROTONOSUPPORT;
312 EXPORT_SYMBOL_GPL(xt_find_revision);
314 int xt_check_match(const struct xt_match *match, unsigned short family,
315 unsigned int size, const char *table, unsigned int hook_mask,
316 unsigned short proto, int inv_proto)
318 if (XT_ALIGN(match->matchsize) != size) {
319 printk("%s_tables: %s match: invalid size %Zu != %u\n",
320 xt_prefix[family], match->name,
321 XT_ALIGN(match->matchsize), size);
324 if (match->table && strcmp(match->table, table)) {
325 printk("%s_tables: %s match: only valid in %s table, not %s\n",
326 xt_prefix[family], match->name, match->table, table);
329 if (match->hooks && (hook_mask & ~match->hooks) != 0) {
330 printk("%s_tables: %s match: bad hook_mask %u/%u\n",
331 xt_prefix[family], match->name, hook_mask, match->hooks);
334 if (match->proto && (match->proto != proto || inv_proto)) {
335 printk("%s_tables: %s match: only valid for protocol %u\n",
336 xt_prefix[family], match->name, match->proto);
341 EXPORT_SYMBOL_GPL(xt_check_match);
344 int xt_compat_add_offset(u_int8_t af, unsigned int offset, short delta)
346 struct compat_delta *tmp;
348 tmp = kmalloc(sizeof(struct compat_delta), GFP_KERNEL);
352 tmp->offset = offset;
355 if (xt[af].compat_offsets) {
356 tmp->next = xt[af].compat_offsets->next;
357 xt[af].compat_offsets->next = tmp;
359 xt[af].compat_offsets = tmp;
364 EXPORT_SYMBOL_GPL(xt_compat_add_offset);
366 void xt_compat_flush_offsets(u_int8_t af)
368 struct compat_delta *tmp, *next;
370 if (xt[af].compat_offsets) {
371 for (tmp = xt[af].compat_offsets; tmp; tmp = next) {
375 xt[af].compat_offsets = NULL;
378 EXPORT_SYMBOL_GPL(xt_compat_flush_offsets);
380 short xt_compat_calc_jump(u_int8_t af, unsigned int offset)
382 struct compat_delta *tmp;
385 for (tmp = xt[af].compat_offsets, delta = 0; tmp; tmp = tmp->next)
386 if (tmp->offset < offset)
390 EXPORT_SYMBOL_GPL(xt_compat_calc_jump);
392 int xt_compat_match_offset(const struct xt_match *match)
394 u_int16_t csize = match->compatsize ? : match->matchsize;
395 return XT_ALIGN(match->matchsize) - COMPAT_XT_ALIGN(csize);
397 EXPORT_SYMBOL_GPL(xt_compat_match_offset);
399 int xt_compat_match_from_user(struct xt_entry_match *m, void **dstptr,
402 const struct xt_match *match = m->u.kernel.match;
403 struct compat_xt_entry_match *cm = (struct compat_xt_entry_match *)m;
404 int pad, off = xt_compat_match_offset(match);
405 u_int16_t msize = cm->u.user.match_size;
408 memcpy(m, cm, sizeof(*cm));
409 if (match->compat_from_user)
410 match->compat_from_user(m->data, cm->data);
412 memcpy(m->data, cm->data, msize - sizeof(*cm));
413 pad = XT_ALIGN(match->matchsize) - match->matchsize;
415 memset(m->data + match->matchsize, 0, pad);
418 m->u.user.match_size = msize;
424 EXPORT_SYMBOL_GPL(xt_compat_match_from_user);
426 int xt_compat_match_to_user(struct xt_entry_match *m, void __user **dstptr,
429 const struct xt_match *match = m->u.kernel.match;
430 struct compat_xt_entry_match __user *cm = *dstptr;
431 int off = xt_compat_match_offset(match);
432 u_int16_t msize = m->u.user.match_size - off;
434 if (copy_to_user(cm, m, sizeof(*cm)) ||
435 put_user(msize, &cm->u.user.match_size) ||
436 copy_to_user(cm->u.user.name, m->u.kernel.match->name,
437 strlen(m->u.kernel.match->name) + 1))
440 if (match->compat_to_user) {
441 if (match->compat_to_user((void __user *)cm->data, m->data))
444 if (copy_to_user(cm->data, m->data, msize - sizeof(*cm)))
452 EXPORT_SYMBOL_GPL(xt_compat_match_to_user);
453 #endif /* CONFIG_COMPAT */
455 int xt_check_target(const struct xt_target *target, unsigned short family,
456 unsigned int size, const char *table, unsigned int hook_mask,
457 unsigned short proto, int inv_proto)
459 if (XT_ALIGN(target->targetsize) != size) {
460 printk("%s_tables: %s target: invalid size %Zu != %u\n",
461 xt_prefix[family], target->name,
462 XT_ALIGN(target->targetsize), size);
465 if (target->table && strcmp(target->table, table)) {
466 printk("%s_tables: %s target: only valid in %s table, not %s\n",
467 xt_prefix[family], target->name, target->table, table);
470 if (target->hooks && (hook_mask & ~target->hooks) != 0) {
471 printk("%s_tables: %s target: bad hook_mask %u/%u\n",
472 xt_prefix[family], target->name, hook_mask,
476 if (target->proto && (target->proto != proto || inv_proto)) {
477 printk("%s_tables: %s target: only valid for protocol %u\n",
478 xt_prefix[family], target->name, target->proto);
483 EXPORT_SYMBOL_GPL(xt_check_target);
486 int xt_compat_target_offset(const struct xt_target *target)
488 u_int16_t csize = target->compatsize ? : target->targetsize;
489 return XT_ALIGN(target->targetsize) - COMPAT_XT_ALIGN(csize);
491 EXPORT_SYMBOL_GPL(xt_compat_target_offset);
493 void xt_compat_target_from_user(struct xt_entry_target *t, void **dstptr,
496 const struct xt_target *target = t->u.kernel.target;
497 struct compat_xt_entry_target *ct = (struct compat_xt_entry_target *)t;
498 int pad, off = xt_compat_target_offset(target);
499 u_int16_t tsize = ct->u.user.target_size;
502 memcpy(t, ct, sizeof(*ct));
503 if (target->compat_from_user)
504 target->compat_from_user(t->data, ct->data);
506 memcpy(t->data, ct->data, tsize - sizeof(*ct));
507 pad = XT_ALIGN(target->targetsize) - target->targetsize;
509 memset(t->data + target->targetsize, 0, pad);
512 t->u.user.target_size = tsize;
517 EXPORT_SYMBOL_GPL(xt_compat_target_from_user);
519 int xt_compat_target_to_user(struct xt_entry_target *t, void __user **dstptr,
522 const struct xt_target *target = t->u.kernel.target;
523 struct compat_xt_entry_target __user *ct = *dstptr;
524 int off = xt_compat_target_offset(target);
525 u_int16_t tsize = t->u.user.target_size - off;
527 if (copy_to_user(ct, t, sizeof(*ct)) ||
528 put_user(tsize, &ct->u.user.target_size) ||
529 copy_to_user(ct->u.user.name, t->u.kernel.target->name,
530 strlen(t->u.kernel.target->name) + 1))
533 if (target->compat_to_user) {
534 if (target->compat_to_user((void __user *)ct->data, t->data))
537 if (copy_to_user(ct->data, t->data, tsize - sizeof(*ct)))
545 EXPORT_SYMBOL_GPL(xt_compat_target_to_user);
548 struct xt_table_info *xt_alloc_table_info(unsigned int size)
550 struct xt_table_info *newinfo;
553 /* Pedantry: prevent them from hitting BUG() in vmalloc.c --RR */
554 if ((SMP_ALIGN(size) >> PAGE_SHIFT) + 2 > num_physpages)
557 newinfo = kzalloc(XT_TABLE_INFO_SZ, GFP_KERNEL);
561 newinfo->size = size;
563 for_each_possible_cpu(cpu) {
564 if (size <= PAGE_SIZE)
565 newinfo->entries[cpu] = kmalloc_node(size,
569 newinfo->entries[cpu] = vmalloc_node(size,
572 if (newinfo->entries[cpu] == NULL) {
573 xt_free_table_info(newinfo);
580 EXPORT_SYMBOL(xt_alloc_table_info);
582 void xt_free_table_info(struct xt_table_info *info)
586 for_each_possible_cpu(cpu) {
587 if (info->size <= PAGE_SIZE)
588 kfree(info->entries[cpu]);
590 vfree(info->entries[cpu]);
594 EXPORT_SYMBOL(xt_free_table_info);
596 /* Find table by name, grabs mutex & ref. Returns ERR_PTR() on error. */
597 struct xt_table *xt_find_table_lock(struct net *net, u_int8_t af,
602 if (mutex_lock_interruptible(&xt[af].mutex) != 0)
603 return ERR_PTR(-EINTR);
605 list_for_each_entry(t, &net->xt.tables[af], list)
606 if (strcmp(t->name, name) == 0 && try_module_get(t->me))
608 mutex_unlock(&xt[af].mutex);
611 EXPORT_SYMBOL_GPL(xt_find_table_lock);
613 void xt_table_unlock(struct xt_table *table)
615 mutex_unlock(&xt[table->af].mutex);
617 EXPORT_SYMBOL_GPL(xt_table_unlock);
620 void xt_compat_lock(u_int8_t af)
622 mutex_lock(&xt[af].compat_mutex);
624 EXPORT_SYMBOL_GPL(xt_compat_lock);
626 void xt_compat_unlock(u_int8_t af)
628 mutex_unlock(&xt[af].compat_mutex);
630 EXPORT_SYMBOL_GPL(xt_compat_unlock);
633 struct xt_table_info *
634 xt_replace_table(struct xt_table *table,
635 unsigned int num_counters,
636 struct xt_table_info *newinfo,
639 struct xt_table_info *oldinfo, *private;
641 /* Do the substitution. */
642 write_lock_bh(&table->lock);
643 private = table->private;
644 /* Check inside lock: is the old number correct? */
645 if (num_counters != private->number) {
646 duprintf("num_counters != table->private->number (%u/%u)\n",
647 num_counters, private->number);
648 write_unlock_bh(&table->lock);
653 table->private = newinfo;
654 newinfo->initial_entries = oldinfo->initial_entries;
655 write_unlock_bh(&table->lock);
659 EXPORT_SYMBOL_GPL(xt_replace_table);
661 struct xt_table *xt_register_table(struct net *net, struct xt_table *table,
662 struct xt_table_info *bootstrap,
663 struct xt_table_info *newinfo)
666 struct xt_table_info *private;
669 /* Don't add one object to multiple lists. */
670 table = kmemdup(table, sizeof(struct xt_table), GFP_KERNEL);
676 ret = mutex_lock_interruptible(&xt[table->af].mutex);
680 /* Don't autoload: we'd eat our tail... */
681 list_for_each_entry(t, &net->xt.tables[table->af], list) {
682 if (strcmp(t->name, table->name) == 0) {
688 /* Simplifies replace_table code. */
689 table->private = bootstrap;
690 rwlock_init(&table->lock);
691 if (!xt_replace_table(table, 0, newinfo, &ret))
694 private = table->private;
695 duprintf("table->private->number = %u\n", private->number);
697 /* save number of initial entries */
698 private->initial_entries = private->number;
700 list_add(&table->list, &net->xt.tables[table->af]);
701 mutex_unlock(&xt[table->af].mutex);
705 mutex_unlock(&xt[table->af].mutex);
711 EXPORT_SYMBOL_GPL(xt_register_table);
713 void *xt_unregister_table(struct xt_table *table)
715 struct xt_table_info *private;
717 mutex_lock(&xt[table->af].mutex);
718 private = table->private;
719 list_del(&table->list);
720 mutex_unlock(&xt[table->af].mutex);
725 EXPORT_SYMBOL_GPL(xt_unregister_table);
727 #ifdef CONFIG_PROC_FS
728 struct xt_names_priv {
729 struct seq_net_private p;
732 static void *xt_table_seq_start(struct seq_file *seq, loff_t *pos)
734 struct xt_names_priv *priv = seq->private;
735 struct net *net = seq_file_net(seq);
736 u_int8_t af = priv->af;
738 mutex_lock(&xt[af].mutex);
739 return seq_list_start(&net->xt.tables[af], *pos);
742 static void *xt_table_seq_next(struct seq_file *seq, void *v, loff_t *pos)
744 struct xt_names_priv *priv = seq->private;
745 struct net *net = seq_file_net(seq);
746 u_int8_t af = priv->af;
748 return seq_list_next(v, &net->xt.tables[af], pos);
751 static void xt_table_seq_stop(struct seq_file *seq, void *v)
753 struct xt_names_priv *priv = seq->private;
754 u_int8_t af = priv->af;
756 mutex_unlock(&xt[af].mutex);
759 static int xt_table_seq_show(struct seq_file *seq, void *v)
761 struct xt_table *table = list_entry(v, struct xt_table, list);
763 if (strlen(table->name))
764 return seq_printf(seq, "%s\n", table->name);
769 static const struct seq_operations xt_table_seq_ops = {
770 .start = xt_table_seq_start,
771 .next = xt_table_seq_next,
772 .stop = xt_table_seq_stop,
773 .show = xt_table_seq_show,
776 static int xt_table_open(struct inode *inode, struct file *file)
779 struct xt_names_priv *priv;
781 ret = seq_open_net(inode, file, &xt_table_seq_ops,
782 sizeof(struct xt_names_priv));
784 priv = ((struct seq_file *)file->private_data)->private;
785 priv->af = (unsigned long)PDE(inode)->data;
790 static const struct file_operations xt_table_ops = {
791 .owner = THIS_MODULE,
792 .open = xt_table_open,
795 .release = seq_release_net,
798 static void *xt_match_seq_start(struct seq_file *seq, loff_t *pos)
800 struct proc_dir_entry *pde = (struct proc_dir_entry *)seq->private;
801 u_int16_t af = (unsigned long)pde->data;
803 mutex_lock(&xt[af].mutex);
804 return seq_list_start(&xt[af].match, *pos);
807 static void *xt_match_seq_next(struct seq_file *seq, void *v, loff_t *pos)
809 struct proc_dir_entry *pde = (struct proc_dir_entry *)seq->private;
810 u_int16_t af = (unsigned long)pde->data;
812 return seq_list_next(v, &xt[af].match, pos);
815 static void xt_match_seq_stop(struct seq_file *seq, void *v)
817 struct proc_dir_entry *pde = seq->private;
818 u_int16_t af = (unsigned long)pde->data;
820 mutex_unlock(&xt[af].mutex);
823 static int xt_match_seq_show(struct seq_file *seq, void *v)
825 struct xt_match *match = list_entry(v, struct xt_match, list);
827 if (strlen(match->name))
828 return seq_printf(seq, "%s\n", match->name);
833 static const struct seq_operations xt_match_seq_ops = {
834 .start = xt_match_seq_start,
835 .next = xt_match_seq_next,
836 .stop = xt_match_seq_stop,
837 .show = xt_match_seq_show,
840 static int xt_match_open(struct inode *inode, struct file *file)
844 ret = seq_open(file, &xt_match_seq_ops);
846 struct seq_file *seq = file->private_data;
848 seq->private = PDE(inode);
853 static const struct file_operations xt_match_ops = {
854 .owner = THIS_MODULE,
855 .open = xt_match_open,
858 .release = seq_release,
861 static void *xt_target_seq_start(struct seq_file *seq, loff_t *pos)
863 struct proc_dir_entry *pde = (struct proc_dir_entry *)seq->private;
864 u_int16_t af = (unsigned long)pde->data;
866 mutex_lock(&xt[af].mutex);
867 return seq_list_start(&xt[af].target, *pos);
870 static void *xt_target_seq_next(struct seq_file *seq, void *v, loff_t *pos)
872 struct proc_dir_entry *pde = (struct proc_dir_entry *)seq->private;
873 u_int16_t af = (unsigned long)pde->data;
875 return seq_list_next(v, &xt[af].target, pos);
878 static void xt_target_seq_stop(struct seq_file *seq, void *v)
880 struct proc_dir_entry *pde = seq->private;
881 u_int16_t af = (unsigned long)pde->data;
883 mutex_unlock(&xt[af].mutex);
886 static int xt_target_seq_show(struct seq_file *seq, void *v)
888 struct xt_target *target = list_entry(v, struct xt_target, list);
890 if (strlen(target->name))
891 return seq_printf(seq, "%s\n", target->name);
896 static const struct seq_operations xt_target_seq_ops = {
897 .start = xt_target_seq_start,
898 .next = xt_target_seq_next,
899 .stop = xt_target_seq_stop,
900 .show = xt_target_seq_show,
903 static int xt_target_open(struct inode *inode, struct file *file)
907 ret = seq_open(file, &xt_target_seq_ops);
909 struct seq_file *seq = file->private_data;
911 seq->private = PDE(inode);
916 static const struct file_operations xt_target_ops = {
917 .owner = THIS_MODULE,
918 .open = xt_target_open,
921 .release = seq_release,
924 #define FORMAT_TABLES "_tables_names"
925 #define FORMAT_MATCHES "_tables_matches"
926 #define FORMAT_TARGETS "_tables_targets"
928 #endif /* CONFIG_PROC_FS */
930 int xt_proto_init(struct net *net, u_int8_t af)
932 #ifdef CONFIG_PROC_FS
933 char buf[XT_FUNCTION_MAXNAMELEN];
934 struct proc_dir_entry *proc;
937 if (af >= ARRAY_SIZE(xt_prefix))
941 #ifdef CONFIG_PROC_FS
942 strlcpy(buf, xt_prefix[af], sizeof(buf));
943 strlcat(buf, FORMAT_TABLES, sizeof(buf));
944 proc = proc_create_data(buf, 0440, net->proc_net, &xt_table_ops,
945 (void *)(unsigned long)af);
949 strlcpy(buf, xt_prefix[af], sizeof(buf));
950 strlcat(buf, FORMAT_MATCHES, sizeof(buf));
951 proc = proc_create_data(buf, 0440, net->proc_net, &xt_match_ops,
952 (void *)(unsigned long)af);
954 goto out_remove_tables;
956 strlcpy(buf, xt_prefix[af], sizeof(buf));
957 strlcat(buf, FORMAT_TARGETS, sizeof(buf));
958 proc = proc_create_data(buf, 0440, net->proc_net, &xt_target_ops,
959 (void *)(unsigned long)af);
961 goto out_remove_matches;
966 #ifdef CONFIG_PROC_FS
968 strlcpy(buf, xt_prefix[af], sizeof(buf));
969 strlcat(buf, FORMAT_MATCHES, sizeof(buf));
970 proc_net_remove(net, buf);
973 strlcpy(buf, xt_prefix[af], sizeof(buf));
974 strlcat(buf, FORMAT_TABLES, sizeof(buf));
975 proc_net_remove(net, buf);
980 EXPORT_SYMBOL_GPL(xt_proto_init);
982 void xt_proto_fini(struct net *net, u_int8_t af)
984 #ifdef CONFIG_PROC_FS
985 char buf[XT_FUNCTION_MAXNAMELEN];
987 strlcpy(buf, xt_prefix[af], sizeof(buf));
988 strlcat(buf, FORMAT_TABLES, sizeof(buf));
989 proc_net_remove(net, buf);
991 strlcpy(buf, xt_prefix[af], sizeof(buf));
992 strlcat(buf, FORMAT_TARGETS, sizeof(buf));
993 proc_net_remove(net, buf);
995 strlcpy(buf, xt_prefix[af], sizeof(buf));
996 strlcat(buf, FORMAT_MATCHES, sizeof(buf));
997 proc_net_remove(net, buf);
998 #endif /*CONFIG_PROC_FS*/
1000 EXPORT_SYMBOL_GPL(xt_proto_fini);
1002 static int __net_init xt_net_init(struct net *net)
1006 for (i = 0; i < NFPROTO_NUMPROTO; i++)
1007 INIT_LIST_HEAD(&net->xt.tables[i]);
1011 static struct pernet_operations xt_net_ops = {
1012 .init = xt_net_init,
1015 static int __init xt_init(void)
1019 xt = kmalloc(sizeof(struct xt_af) * NFPROTO_NUMPROTO, GFP_KERNEL);
1023 for (i = 0; i < NFPROTO_NUMPROTO; i++) {
1024 mutex_init(&xt[i].mutex);
1025 #ifdef CONFIG_COMPAT
1026 mutex_init(&xt[i].compat_mutex);
1027 xt[i].compat_offsets = NULL;
1029 INIT_LIST_HEAD(&xt[i].target);
1030 INIT_LIST_HEAD(&xt[i].match);
1032 rv = register_pernet_subsys(&xt_net_ops);
1038 static void __exit xt_fini(void)
1040 unregister_pernet_subsys(&xt_net_ops);
1044 module_init(xt_init);
1045 module_exit(xt_fini);