blob: 9c06b9f86ad45a524c2b3e2fe1b522930ca70af0 [file] [log] [blame]
/* Helper handling for netfilter. */
/* (C) 1999-2001 Paul `Rusty' Russell
* (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
* (C) 2003,2004 USAGI/WIDE Project <http://www.linux-ipv6.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/types.h>
#include <linux/netfilter.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/vmalloc.h>
#include <linux/stddef.h>
#include <linux/slab.h>
#include <linux/random.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/rculist.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_l3proto.h>
#include <net/netfilter/nf_conntrack_l4proto.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/nf_conntrack_extend.h>
static DEFINE_MUTEX(nf_ct_helper_mutex);
static struct hlist_head *nf_ct_helper_hash __read_mostly;
static unsigned int nf_ct_helper_hsize __read_mostly;
static unsigned int nf_ct_helper_count __read_mostly;
static int nf_ct_helper_vmalloc;
/* Stupid hash, but collision free for the default registrations of the
* helpers currently in the kernel. */
static unsigned int helper_hash(const struct nf_conntrack_tuple *tuple)
{
return (((tuple->src.l3num << 8) | tuple->dst.protonum) ^
(__force __u16)tuple->src.u.all) % nf_ct_helper_hsize;
}
struct nf_conntrack_helper *
__nf_ct_helper_find(const struct nf_conntrack_tuple *tuple)
{
struct nf_conntrack_helper *helper;
struct nf_conntrack_tuple_mask mask = { .src.u.all = htons(0xFFFF) };
struct hlist_node *n;
unsigned int h;
if (!nf_ct_helper_count)
return NULL;
h = helper_hash(tuple);
hlist_for_each_entry_rcu(helper, n, &nf_ct_helper_hash[h], hnode) {
if (nf_ct_tuple_src_mask_cmp(tuple, &helper->tuple, &mask))
return helper;
}
return NULL;
}
EXPORT_SYMBOL_GPL(__nf_ct_helper_find);
struct nf_conntrack_helper *
__nf_conntrack_helper_find_byname(const char *name)
{
struct nf_conntrack_helper *h;
struct hlist_node *n;
unsigned int i;
for (i = 0; i < nf_ct_helper_hsize; i++) {
hlist_for_each_entry_rcu(h, n, &nf_ct_helper_hash[i], hnode) {
if (!strcmp(h->name, name))
return h;
}
}
return NULL;
}
EXPORT_SYMBOL_GPL(__nf_conntrack_helper_find_byname);
struct nf_conn_help *nf_ct_helper_ext_add(struct nf_conn *ct, gfp_t gfp)
{
struct nf_conn_help *help;
help = nf_ct_ext_add(ct, NF_CT_EXT_HELPER, gfp);
if (help)
INIT_HLIST_HEAD(&help->expectations);
else
pr_debug("failed to add helper extension area");
return help;
}
EXPORT_SYMBOL_GPL(nf_ct_helper_ext_add);
static inline int unhelp(struct nf_conntrack_tuple_hash *i,
const struct nf_conntrack_helper *me)
{
struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(i);
struct nf_conn_help *help = nfct_help(ct);
if (help && help->helper == me) {
nf_conntrack_event(IPCT_HELPER, ct);
rcu_assign_pointer(help->helper, NULL);
}
return 0;
}
int nf_conntrack_helper_register(struct nf_conntrack_helper *me)
{
unsigned int h = helper_hash(&me->tuple);
BUG_ON(me->expect_policy == NULL);
BUG_ON(me->expect_class_max >= NF_CT_MAX_EXPECT_CLASSES);
mutex_lock(&nf_ct_helper_mutex);
hlist_add_head_rcu(&me->hnode, &nf_ct_helper_hash[h]);
nf_ct_helper_count++;
mutex_unlock(&nf_ct_helper_mutex);
return 0;
}
EXPORT_SYMBOL_GPL(nf_conntrack_helper_register);
static void __nf_conntrack_helper_unregister(struct nf_conntrack_helper *me,
struct net *net)
{
struct nf_conntrack_tuple_hash *h;
struct nf_conntrack_expect *exp;
const struct hlist_node *n, *next;
unsigned int i;
/* Get rid of expectations */
for (i = 0; i < nf_ct_expect_hsize; i++) {
hlist_for_each_entry_safe(exp, n, next,
&net->ct.expect_hash[i], hnode) {
struct nf_conn_help *help = nfct_help(exp->master);
if ((help->helper == me || exp->helper == me) &&
del_timer(&exp->timeout)) {
nf_ct_unlink_expect(exp);
nf_ct_expect_put(exp);
}
}
}
/* Get rid of expecteds, set helpers to NULL. */
hlist_for_each_entry(h, n, &net->ct.unconfirmed, hnode)
unhelp(h, me);
for (i = 0; i < nf_conntrack_htable_size; i++) {
hlist_for_each_entry(h, n, &net->ct.hash[i], hnode)
unhelp(h, me);
}
}
void nf_conntrack_helper_unregister(struct nf_conntrack_helper *me)
{
struct net *net;
mutex_lock(&nf_ct_helper_mutex);
hlist_del_rcu(&me->hnode);
nf_ct_helper_count--;
mutex_unlock(&nf_ct_helper_mutex);
/* Make sure every nothing is still using the helper unless its a
* connection in the hash.
*/
synchronize_rcu();
spin_lock_bh(&nf_conntrack_lock);
for_each_net(net)
__nf_conntrack_helper_unregister(me, net);
spin_unlock_bh(&nf_conntrack_lock);
}
EXPORT_SYMBOL_GPL(nf_conntrack_helper_unregister);
static struct nf_ct_ext_type helper_extend __read_mostly = {
.len = sizeof(struct nf_conn_help),
.align = __alignof__(struct nf_conn_help),
.id = NF_CT_EXT_HELPER,
};
int nf_conntrack_helper_init(void)
{
int err;
nf_ct_helper_hsize = 1; /* gets rounded up to use one page */
nf_ct_helper_hash = nf_ct_alloc_hashtable(&nf_ct_helper_hsize,
&nf_ct_helper_vmalloc);
if (!nf_ct_helper_hash)
return -ENOMEM;
err = nf_ct_extend_register(&helper_extend);
if (err < 0)
goto err1;
return 0;
err1:
nf_ct_free_hashtable(nf_ct_helper_hash, nf_ct_helper_vmalloc,
nf_ct_helper_hsize);
return err;
}
void nf_conntrack_helper_fini(void)
{
nf_ct_extend_unregister(&helper_extend);
nf_ct_free_hashtable(nf_ct_helper_hash, nf_ct_helper_vmalloc,
nf_ct_helper_hsize);
}