![YOSHIFUJI Hideaki](/assets/img/avatar_default.png)
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
891 lines
20 KiB
C
891 lines
20 KiB
C
/*
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* x_tables core - Backend for {ip,ip6,arp}_tables
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*
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* Copyright (C) 2006-2006 Harald Welte <laforge@netfilter.org>
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*
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* Based on existing ip_tables code which is
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* Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
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* Copyright (C) 2000-2005 Netfilter Core Team <coreteam@netfilter.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/socket.h>
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#include <linux/net.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/string.h>
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#include <linux/vmalloc.h>
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#include <linux/mutex.h>
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#include <linux/mm.h>
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#include <linux/netfilter/x_tables.h>
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#include <linux/netfilter_arp.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
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MODULE_DESCRIPTION("[ip,ip6,arp]_tables backend module");
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#define SMP_ALIGN(x) (((x) + SMP_CACHE_BYTES-1) & ~(SMP_CACHE_BYTES-1))
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struct xt_af {
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struct mutex mutex;
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struct list_head match;
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struct list_head target;
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struct list_head tables;
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struct mutex compat_mutex;
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};
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static struct xt_af *xt;
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#ifdef DEBUG_IP_FIREWALL_USER
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#define duprintf(format, args...) printk(format , ## args)
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#else
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#define duprintf(format, args...)
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#endif
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enum {
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TABLE,
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TARGET,
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MATCH,
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};
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static const char *xt_prefix[NPROTO] = {
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[AF_INET] = "ip",
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[AF_INET6] = "ip6",
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[NF_ARP] = "arp",
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};
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/* Registration hooks for targets. */
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int
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xt_register_target(struct xt_target *target)
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{
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int ret, af = target->family;
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ret = mutex_lock_interruptible(&xt[af].mutex);
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if (ret != 0)
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return ret;
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list_add(&target->list, &xt[af].target);
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mutex_unlock(&xt[af].mutex);
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return ret;
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}
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EXPORT_SYMBOL(xt_register_target);
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void
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xt_unregister_target(struct xt_target *target)
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{
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int af = target->family;
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mutex_lock(&xt[af].mutex);
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list_del(&target->list);
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mutex_unlock(&xt[af].mutex);
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}
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EXPORT_SYMBOL(xt_unregister_target);
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int
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xt_register_targets(struct xt_target *target, unsigned int n)
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{
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unsigned int i;
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int err = 0;
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for (i = 0; i < n; i++) {
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err = xt_register_target(&target[i]);
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if (err)
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goto err;
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}
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return err;
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err:
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if (i > 0)
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xt_unregister_targets(target, i);
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return err;
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}
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EXPORT_SYMBOL(xt_register_targets);
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void
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xt_unregister_targets(struct xt_target *target, unsigned int n)
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{
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unsigned int i;
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for (i = 0; i < n; i++)
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xt_unregister_target(&target[i]);
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}
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EXPORT_SYMBOL(xt_unregister_targets);
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int
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xt_register_match(struct xt_match *match)
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{
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int ret, af = match->family;
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ret = mutex_lock_interruptible(&xt[af].mutex);
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if (ret != 0)
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return ret;
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list_add(&match->list, &xt[af].match);
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mutex_unlock(&xt[af].mutex);
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return ret;
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}
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EXPORT_SYMBOL(xt_register_match);
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void
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xt_unregister_match(struct xt_match *match)
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{
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int af = match->family;
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mutex_lock(&xt[af].mutex);
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list_del(&match->list);
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mutex_unlock(&xt[af].mutex);
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}
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EXPORT_SYMBOL(xt_unregister_match);
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int
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xt_register_matches(struct xt_match *match, unsigned int n)
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{
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unsigned int i;
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int err = 0;
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for (i = 0; i < n; i++) {
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err = xt_register_match(&match[i]);
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if (err)
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goto err;
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}
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return err;
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err:
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if (i > 0)
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xt_unregister_matches(match, i);
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return err;
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}
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EXPORT_SYMBOL(xt_register_matches);
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void
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xt_unregister_matches(struct xt_match *match, unsigned int n)
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{
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unsigned int i;
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for (i = 0; i < n; i++)
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xt_unregister_match(&match[i]);
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}
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EXPORT_SYMBOL(xt_unregister_matches);
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/*
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* These are weird, but module loading must not be done with mutex
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* held (since they will register), and we have to have a single
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* function to use try_then_request_module().
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*/
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/* Find match, grabs ref. Returns ERR_PTR() on error. */
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struct xt_match *xt_find_match(int af, const char *name, u8 revision)
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{
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struct xt_match *m;
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int err = 0;
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if (mutex_lock_interruptible(&xt[af].mutex) != 0)
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return ERR_PTR(-EINTR);
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list_for_each_entry(m, &xt[af].match, list) {
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if (strcmp(m->name, name) == 0) {
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if (m->revision == revision) {
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if (try_module_get(m->me)) {
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mutex_unlock(&xt[af].mutex);
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return m;
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}
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} else
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err = -EPROTOTYPE; /* Found something. */
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}
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}
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mutex_unlock(&xt[af].mutex);
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return ERR_PTR(err);
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}
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EXPORT_SYMBOL(xt_find_match);
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/* Find target, grabs ref. Returns ERR_PTR() on error. */
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struct xt_target *xt_find_target(int af, const char *name, u8 revision)
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{
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struct xt_target *t;
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int err = 0;
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if (mutex_lock_interruptible(&xt[af].mutex) != 0)
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return ERR_PTR(-EINTR);
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list_for_each_entry(t, &xt[af].target, list) {
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if (strcmp(t->name, name) == 0) {
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if (t->revision == revision) {
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if (try_module_get(t->me)) {
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mutex_unlock(&xt[af].mutex);
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return t;
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}
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} else
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err = -EPROTOTYPE; /* Found something. */
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}
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}
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mutex_unlock(&xt[af].mutex);
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return ERR_PTR(err);
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}
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EXPORT_SYMBOL(xt_find_target);
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struct xt_target *xt_request_find_target(int af, const char *name, u8 revision)
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{
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struct xt_target *target;
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target = try_then_request_module(xt_find_target(af, name, revision),
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"%st_%s", xt_prefix[af], name);
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if (IS_ERR(target) || !target)
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return NULL;
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return target;
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}
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EXPORT_SYMBOL_GPL(xt_request_find_target);
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static int match_revfn(int af, const char *name, u8 revision, int *bestp)
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{
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struct xt_match *m;
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int have_rev = 0;
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list_for_each_entry(m, &xt[af].match, list) {
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if (strcmp(m->name, name) == 0) {
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if (m->revision > *bestp)
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*bestp = m->revision;
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if (m->revision == revision)
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have_rev = 1;
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}
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}
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return have_rev;
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}
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static int target_revfn(int af, const char *name, u8 revision, int *bestp)
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{
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struct xt_target *t;
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int have_rev = 0;
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list_for_each_entry(t, &xt[af].target, list) {
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if (strcmp(t->name, name) == 0) {
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if (t->revision > *bestp)
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*bestp = t->revision;
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if (t->revision == revision)
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have_rev = 1;
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}
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}
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return have_rev;
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}
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/* Returns true or false (if no such extension at all) */
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int xt_find_revision(int af, const char *name, u8 revision, int target,
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int *err)
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{
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int have_rev, best = -1;
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if (mutex_lock_interruptible(&xt[af].mutex) != 0) {
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*err = -EINTR;
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return 1;
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}
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if (target == 1)
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have_rev = target_revfn(af, name, revision, &best);
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else
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have_rev = match_revfn(af, name, revision, &best);
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mutex_unlock(&xt[af].mutex);
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/* Nothing at all? Return 0 to try loading module. */
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if (best == -1) {
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*err = -ENOENT;
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return 0;
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}
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*err = best;
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if (!have_rev)
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*err = -EPROTONOSUPPORT;
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return 1;
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}
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EXPORT_SYMBOL_GPL(xt_find_revision);
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int xt_check_match(const struct xt_match *match, unsigned short family,
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unsigned int size, const char *table, unsigned int hook_mask,
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unsigned short proto, int inv_proto)
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{
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if (XT_ALIGN(match->matchsize) != size) {
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printk("%s_tables: %s match: invalid size %Zu != %u\n",
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xt_prefix[family], match->name,
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XT_ALIGN(match->matchsize), size);
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return -EINVAL;
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}
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if (match->table && strcmp(match->table, table)) {
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printk("%s_tables: %s match: only valid in %s table, not %s\n",
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xt_prefix[family], match->name, match->table, table);
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return -EINVAL;
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}
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if (match->hooks && (hook_mask & ~match->hooks) != 0) {
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printk("%s_tables: %s match: bad hook_mask %u\n",
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xt_prefix[family], match->name, hook_mask);
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return -EINVAL;
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}
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if (match->proto && (match->proto != proto || inv_proto)) {
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printk("%s_tables: %s match: only valid for protocol %u\n",
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xt_prefix[family], match->name, match->proto);
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return -EINVAL;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(xt_check_match);
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#ifdef CONFIG_COMPAT
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int xt_compat_match_offset(struct xt_match *match)
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{
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u_int16_t csize = match->compatsize ? : match->matchsize;
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return XT_ALIGN(match->matchsize) - COMPAT_XT_ALIGN(csize);
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}
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EXPORT_SYMBOL_GPL(xt_compat_match_offset);
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void xt_compat_match_from_user(struct xt_entry_match *m, void **dstptr,
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int *size)
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{
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struct xt_match *match = m->u.kernel.match;
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struct compat_xt_entry_match *cm = (struct compat_xt_entry_match *)m;
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int pad, off = xt_compat_match_offset(match);
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u_int16_t msize = cm->u.user.match_size;
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m = *dstptr;
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memcpy(m, cm, sizeof(*cm));
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if (match->compat_from_user)
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match->compat_from_user(m->data, cm->data);
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else
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memcpy(m->data, cm->data, msize - sizeof(*cm));
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pad = XT_ALIGN(match->matchsize) - match->matchsize;
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if (pad > 0)
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memset(m->data + match->matchsize, 0, pad);
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msize += off;
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m->u.user.match_size = msize;
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*size += off;
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*dstptr += msize;
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}
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EXPORT_SYMBOL_GPL(xt_compat_match_from_user);
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int xt_compat_match_to_user(struct xt_entry_match *m, void __user **dstptr,
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int *size)
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{
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struct xt_match *match = m->u.kernel.match;
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struct compat_xt_entry_match __user *cm = *dstptr;
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int off = xt_compat_match_offset(match);
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u_int16_t msize = m->u.user.match_size - off;
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if (copy_to_user(cm, m, sizeof(*cm)) ||
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put_user(msize, &cm->u.user.match_size))
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return -EFAULT;
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if (match->compat_to_user) {
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if (match->compat_to_user((void __user *)cm->data, m->data))
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return -EFAULT;
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} else {
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if (copy_to_user(cm->data, m->data, msize - sizeof(*cm)))
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return -EFAULT;
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}
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*size -= off;
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*dstptr += msize;
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return 0;
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}
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EXPORT_SYMBOL_GPL(xt_compat_match_to_user);
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#endif /* CONFIG_COMPAT */
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int xt_check_target(const struct xt_target *target, unsigned short family,
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unsigned int size, const char *table, unsigned int hook_mask,
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unsigned short proto, int inv_proto)
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{
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if (XT_ALIGN(target->targetsize) != size) {
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printk("%s_tables: %s target: invalid size %Zu != %u\n",
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xt_prefix[family], target->name,
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XT_ALIGN(target->targetsize), size);
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return -EINVAL;
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}
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if (target->table && strcmp(target->table, table)) {
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printk("%s_tables: %s target: only valid in %s table, not %s\n",
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xt_prefix[family], target->name, target->table, table);
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return -EINVAL;
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}
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if (target->hooks && (hook_mask & ~target->hooks) != 0) {
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printk("%s_tables: %s target: bad hook_mask %u\n",
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xt_prefix[family], target->name, hook_mask);
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return -EINVAL;
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}
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if (target->proto && (target->proto != proto || inv_proto)) {
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printk("%s_tables: %s target: only valid for protocol %u\n",
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xt_prefix[family], target->name, target->proto);
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return -EINVAL;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(xt_check_target);
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#ifdef CONFIG_COMPAT
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int xt_compat_target_offset(struct xt_target *target)
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{
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u_int16_t csize = target->compatsize ? : target->targetsize;
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return XT_ALIGN(target->targetsize) - COMPAT_XT_ALIGN(csize);
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}
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EXPORT_SYMBOL_GPL(xt_compat_target_offset);
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void xt_compat_target_from_user(struct xt_entry_target *t, void **dstptr,
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int *size)
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{
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struct xt_target *target = t->u.kernel.target;
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struct compat_xt_entry_target *ct = (struct compat_xt_entry_target *)t;
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int pad, off = xt_compat_target_offset(target);
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u_int16_t tsize = ct->u.user.target_size;
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t = *dstptr;
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memcpy(t, ct, sizeof(*ct));
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if (target->compat_from_user)
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target->compat_from_user(t->data, ct->data);
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else
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memcpy(t->data, ct->data, tsize - sizeof(*ct));
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pad = XT_ALIGN(target->targetsize) - target->targetsize;
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if (pad > 0)
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memset(t->data + target->targetsize, 0, pad);
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tsize += off;
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t->u.user.target_size = tsize;
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*size += off;
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*dstptr += tsize;
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}
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EXPORT_SYMBOL_GPL(xt_compat_target_from_user);
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int xt_compat_target_to_user(struct xt_entry_target *t, void __user **dstptr,
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int *size)
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{
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struct xt_target *target = t->u.kernel.target;
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struct compat_xt_entry_target __user *ct = *dstptr;
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int off = xt_compat_target_offset(target);
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u_int16_t tsize = t->u.user.target_size - off;
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if (copy_to_user(ct, t, sizeof(*ct)) ||
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put_user(tsize, &ct->u.user.target_size))
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return -EFAULT;
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if (target->compat_to_user) {
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if (target->compat_to_user((void __user *)ct->data, t->data))
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return -EFAULT;
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} else {
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if (copy_to_user(ct->data, t->data, tsize - sizeof(*ct)))
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return -EFAULT;
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}
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*size -= off;
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*dstptr += tsize;
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return 0;
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}
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EXPORT_SYMBOL_GPL(xt_compat_target_to_user);
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#endif
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struct xt_table_info *xt_alloc_table_info(unsigned int size)
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{
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struct xt_table_info *newinfo;
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int cpu;
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/* Pedantry: prevent them from hitting BUG() in vmalloc.c --RR */
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if ((SMP_ALIGN(size) >> PAGE_SHIFT) + 2 > num_physpages)
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return NULL;
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newinfo = kzalloc(sizeof(struct xt_table_info), GFP_KERNEL);
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if (!newinfo)
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return NULL;
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newinfo->size = size;
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for_each_possible_cpu(cpu) {
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if (size <= PAGE_SIZE)
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newinfo->entries[cpu] = kmalloc_node(size,
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GFP_KERNEL,
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cpu_to_node(cpu));
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else
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newinfo->entries[cpu] = vmalloc_node(size,
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cpu_to_node(cpu));
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if (newinfo->entries[cpu] == NULL) {
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xt_free_table_info(newinfo);
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return NULL;
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}
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}
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|
return newinfo;
|
|
}
|
|
EXPORT_SYMBOL(xt_alloc_table_info);
|
|
|
|
void xt_free_table_info(struct xt_table_info *info)
|
|
{
|
|
int cpu;
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
if (info->size <= PAGE_SIZE)
|
|
kfree(info->entries[cpu]);
|
|
else
|
|
vfree(info->entries[cpu]);
|
|
}
|
|
kfree(info);
|
|
}
|
|
EXPORT_SYMBOL(xt_free_table_info);
|
|
|
|
/* Find table by name, grabs mutex & ref. Returns ERR_PTR() on error. */
|
|
struct xt_table *xt_find_table_lock(int af, const char *name)
|
|
{
|
|
struct xt_table *t;
|
|
|
|
if (mutex_lock_interruptible(&xt[af].mutex) != 0)
|
|
return ERR_PTR(-EINTR);
|
|
|
|
list_for_each_entry(t, &xt[af].tables, list)
|
|
if (strcmp(t->name, name) == 0 && try_module_get(t->me))
|
|
return t;
|
|
mutex_unlock(&xt[af].mutex);
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(xt_find_table_lock);
|
|
|
|
void xt_table_unlock(struct xt_table *table)
|
|
{
|
|
mutex_unlock(&xt[table->af].mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xt_table_unlock);
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
void xt_compat_lock(int af)
|
|
{
|
|
mutex_lock(&xt[af].compat_mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xt_compat_lock);
|
|
|
|
void xt_compat_unlock(int af)
|
|
{
|
|
mutex_unlock(&xt[af].compat_mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xt_compat_unlock);
|
|
#endif
|
|
|
|
struct xt_table_info *
|
|
xt_replace_table(struct xt_table *table,
|
|
unsigned int num_counters,
|
|
struct xt_table_info *newinfo,
|
|
int *error)
|
|
{
|
|
struct xt_table_info *oldinfo, *private;
|
|
|
|
/* Do the substitution. */
|
|
write_lock_bh(&table->lock);
|
|
private = table->private;
|
|
/* Check inside lock: is the old number correct? */
|
|
if (num_counters != private->number) {
|
|
duprintf("num_counters != table->private->number (%u/%u)\n",
|
|
num_counters, private->number);
|
|
write_unlock_bh(&table->lock);
|
|
*error = -EAGAIN;
|
|
return NULL;
|
|
}
|
|
oldinfo = private;
|
|
table->private = newinfo;
|
|
newinfo->initial_entries = oldinfo->initial_entries;
|
|
write_unlock_bh(&table->lock);
|
|
|
|
return oldinfo;
|
|
}
|
|
EXPORT_SYMBOL_GPL(xt_replace_table);
|
|
|
|
int xt_register_table(struct xt_table *table,
|
|
struct xt_table_info *bootstrap,
|
|
struct xt_table_info *newinfo)
|
|
{
|
|
int ret;
|
|
struct xt_table_info *private;
|
|
struct xt_table *t;
|
|
|
|
ret = mutex_lock_interruptible(&xt[table->af].mutex);
|
|
if (ret != 0)
|
|
return ret;
|
|
|
|
/* Don't autoload: we'd eat our tail... */
|
|
list_for_each_entry(t, &xt[table->af].tables, list) {
|
|
if (strcmp(t->name, table->name) == 0) {
|
|
ret = -EEXIST;
|
|
goto unlock;
|
|
}
|
|
}
|
|
|
|
/* Simplifies replace_table code. */
|
|
table->private = bootstrap;
|
|
rwlock_init(&table->lock);
|
|
if (!xt_replace_table(table, 0, newinfo, &ret))
|
|
goto unlock;
|
|
|
|
private = table->private;
|
|
duprintf("table->private->number = %u\n", private->number);
|
|
|
|
/* save number of initial entries */
|
|
private->initial_entries = private->number;
|
|
|
|
list_add(&table->list, &xt[table->af].tables);
|
|
|
|
ret = 0;
|
|
unlock:
|
|
mutex_unlock(&xt[table->af].mutex);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(xt_register_table);
|
|
|
|
void *xt_unregister_table(struct xt_table *table)
|
|
{
|
|
struct xt_table_info *private;
|
|
|
|
mutex_lock(&xt[table->af].mutex);
|
|
private = table->private;
|
|
list_del(&table->list);
|
|
mutex_unlock(&xt[table->af].mutex);
|
|
|
|
return private;
|
|
}
|
|
EXPORT_SYMBOL_GPL(xt_unregister_table);
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
static char *xt_proto_prefix[NPROTO] = {
|
|
[AF_INET] = "ip",
|
|
[AF_INET6] = "ip6",
|
|
[NF_ARP] = "arp",
|
|
};
|
|
|
|
static struct list_head *xt_get_idx(struct list_head *list, struct seq_file *seq, loff_t pos)
|
|
{
|
|
struct list_head *head = list->next;
|
|
|
|
if (!head || list_empty(list))
|
|
return NULL;
|
|
|
|
while (pos && (head = head->next)) {
|
|
if (head == list)
|
|
return NULL;
|
|
pos--;
|
|
}
|
|
return pos ? NULL : head;
|
|
}
|
|
|
|
static struct list_head *type2list(u_int16_t af, u_int16_t type)
|
|
{
|
|
struct list_head *list;
|
|
|
|
switch (type) {
|
|
case TARGET:
|
|
list = &xt[af].target;
|
|
break;
|
|
case MATCH:
|
|
list = &xt[af].match;
|
|
break;
|
|
case TABLE:
|
|
list = &xt[af].tables;
|
|
break;
|
|
default:
|
|
list = NULL;
|
|
break;
|
|
}
|
|
|
|
return list;
|
|
}
|
|
|
|
static void *xt_tgt_seq_start(struct seq_file *seq, loff_t *pos)
|
|
{
|
|
struct proc_dir_entry *pde = (struct proc_dir_entry *) seq->private;
|
|
u_int16_t af = (unsigned long)pde->data & 0xffff;
|
|
u_int16_t type = (unsigned long)pde->data >> 16;
|
|
struct list_head *list;
|
|
|
|
if (af >= NPROTO)
|
|
return NULL;
|
|
|
|
list = type2list(af, type);
|
|
if (!list)
|
|
return NULL;
|
|
|
|
if (mutex_lock_interruptible(&xt[af].mutex) != 0)
|
|
return NULL;
|
|
|
|
return xt_get_idx(list, seq, *pos);
|
|
}
|
|
|
|
static void *xt_tgt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
struct proc_dir_entry *pde = seq->private;
|
|
u_int16_t af = (unsigned long)pde->data & 0xffff;
|
|
u_int16_t type = (unsigned long)pde->data >> 16;
|
|
struct list_head *list;
|
|
|
|
if (af >= NPROTO)
|
|
return NULL;
|
|
|
|
list = type2list(af, type);
|
|
if (!list)
|
|
return NULL;
|
|
|
|
(*pos)++;
|
|
return xt_get_idx(list, seq, *pos);
|
|
}
|
|
|
|
static void xt_tgt_seq_stop(struct seq_file *seq, void *v)
|
|
{
|
|
struct proc_dir_entry *pde = seq->private;
|
|
u_int16_t af = (unsigned long)pde->data & 0xffff;
|
|
|
|
mutex_unlock(&xt[af].mutex);
|
|
}
|
|
|
|
static int xt_name_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
char *name = (char *)v + sizeof(struct list_head);
|
|
|
|
if (strlen(name))
|
|
return seq_printf(seq, "%s\n", name);
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static struct seq_operations xt_tgt_seq_ops = {
|
|
.start = xt_tgt_seq_start,
|
|
.next = xt_tgt_seq_next,
|
|
.stop = xt_tgt_seq_stop,
|
|
.show = xt_name_seq_show,
|
|
};
|
|
|
|
static int xt_tgt_open(struct inode *inode, struct file *file)
|
|
{
|
|
int ret;
|
|
|
|
ret = seq_open(file, &xt_tgt_seq_ops);
|
|
if (!ret) {
|
|
struct seq_file *seq = file->private_data;
|
|
struct proc_dir_entry *pde = PDE(inode);
|
|
|
|
seq->private = pde;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct file_operations xt_file_ops = {
|
|
.owner = THIS_MODULE,
|
|
.open = xt_tgt_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release,
|
|
};
|
|
|
|
#define FORMAT_TABLES "_tables_names"
|
|
#define FORMAT_MATCHES "_tables_matches"
|
|
#define FORMAT_TARGETS "_tables_targets"
|
|
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
int xt_proto_init(int af)
|
|
{
|
|
#ifdef CONFIG_PROC_FS
|
|
char buf[XT_FUNCTION_MAXNAMELEN];
|
|
struct proc_dir_entry *proc;
|
|
#endif
|
|
|
|
if (af >= NPROTO)
|
|
return -EINVAL;
|
|
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
strlcpy(buf, xt_proto_prefix[af], sizeof(buf));
|
|
strlcat(buf, FORMAT_TABLES, sizeof(buf));
|
|
proc = proc_net_fops_create(buf, 0440, &xt_file_ops);
|
|
if (!proc)
|
|
goto out;
|
|
proc->data = (void *) ((unsigned long) af | (TABLE << 16));
|
|
|
|
|
|
strlcpy(buf, xt_proto_prefix[af], sizeof(buf));
|
|
strlcat(buf, FORMAT_MATCHES, sizeof(buf));
|
|
proc = proc_net_fops_create(buf, 0440, &xt_file_ops);
|
|
if (!proc)
|
|
goto out_remove_tables;
|
|
proc->data = (void *) ((unsigned long) af | (MATCH << 16));
|
|
|
|
strlcpy(buf, xt_proto_prefix[af], sizeof(buf));
|
|
strlcat(buf, FORMAT_TARGETS, sizeof(buf));
|
|
proc = proc_net_fops_create(buf, 0440, &xt_file_ops);
|
|
if (!proc)
|
|
goto out_remove_matches;
|
|
proc->data = (void *) ((unsigned long) af | (TARGET << 16));
|
|
#endif
|
|
|
|
return 0;
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
out_remove_matches:
|
|
strlcpy(buf, xt_proto_prefix[af], sizeof(buf));
|
|
strlcat(buf, FORMAT_MATCHES, sizeof(buf));
|
|
proc_net_remove(buf);
|
|
|
|
out_remove_tables:
|
|
strlcpy(buf, xt_proto_prefix[af], sizeof(buf));
|
|
strlcat(buf, FORMAT_TABLES, sizeof(buf));
|
|
proc_net_remove(buf);
|
|
out:
|
|
return -1;
|
|
#endif
|
|
}
|
|
EXPORT_SYMBOL_GPL(xt_proto_init);
|
|
|
|
void xt_proto_fini(int af)
|
|
{
|
|
#ifdef CONFIG_PROC_FS
|
|
char buf[XT_FUNCTION_MAXNAMELEN];
|
|
|
|
strlcpy(buf, xt_proto_prefix[af], sizeof(buf));
|
|
strlcat(buf, FORMAT_TABLES, sizeof(buf));
|
|
proc_net_remove(buf);
|
|
|
|
strlcpy(buf, xt_proto_prefix[af], sizeof(buf));
|
|
strlcat(buf, FORMAT_TARGETS, sizeof(buf));
|
|
proc_net_remove(buf);
|
|
|
|
strlcpy(buf, xt_proto_prefix[af], sizeof(buf));
|
|
strlcat(buf, FORMAT_MATCHES, sizeof(buf));
|
|
proc_net_remove(buf);
|
|
#endif /*CONFIG_PROC_FS*/
|
|
}
|
|
EXPORT_SYMBOL_GPL(xt_proto_fini);
|
|
|
|
|
|
static int __init xt_init(void)
|
|
{
|
|
int i;
|
|
|
|
xt = kmalloc(sizeof(struct xt_af) * NPROTO, GFP_KERNEL);
|
|
if (!xt)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < NPROTO; i++) {
|
|
mutex_init(&xt[i].mutex);
|
|
#ifdef CONFIG_COMPAT
|
|
mutex_init(&xt[i].compat_mutex);
|
|
#endif
|
|
INIT_LIST_HEAD(&xt[i].target);
|
|
INIT_LIST_HEAD(&xt[i].match);
|
|
INIT_LIST_HEAD(&xt[i].tables);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void __exit xt_fini(void)
|
|
{
|
|
kfree(xt);
|
|
}
|
|
|
|
module_init(xt_init);
|
|
module_exit(xt_fini);
|
|
|