* 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.
- *
- * 19 Mar 2002 Harald Welte <laforge@gnumonks.org>:
- * - Port to newnat infrastructure
*/
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/netfilter.h>
-#if defined(CONFIG_IP_NF_CONNTRACK) || defined(CONFIG_IP_NF_CONNTRACK_MODULE)
-#include <linux/netfilter_ipv4/ip_conntrack.h>
-#include <linux/netfilter_ipv4/ip_conntrack_core.h>
-#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
-#else
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/nf_conntrack_helper.h>
-#endif
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_helper.h>
-#include <net/netfilter/nf_conntrack_compat.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Martin Josefsson <gandalf@netfilter.org>");
MODULE_ALIAS("ipt_helper");
MODULE_ALIAS("ip6t_helper");
-#if 0
-#define DEBUGP printk
-#else
-#define DEBUGP(format, args...)
-#endif
-#if defined(CONFIG_IP_NF_CONNTRACK) || defined(CONFIG_IP_NF_CONNTRACK_MODULE)
-static int
+static bool
match(const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
const void *matchinfo,
int offset,
unsigned int protoff,
- int *hotdrop)
+ bool *hotdrop)
{
const struct xt_helper_info *info = matchinfo;
- struct ip_conntrack *ct;
+ const struct nf_conn *ct;
+ const struct nf_conn_help *master_help;
+ const struct nf_conntrack_helper *helper;
enum ip_conntrack_info ctinfo;
- int ret = info->invert;
-
- ct = ip_conntrack_get((struct sk_buff *)skb, &ctinfo);
- if (!ct) {
- DEBUGP("xt_helper: Eek! invalid conntrack?\n");
- return ret;
- }
+ bool ret = info->invert;
- if (!ct->master) {
- DEBUGP("xt_helper: conntrack %p has no master\n", ct);
+ ct = nf_ct_get(skb, &ctinfo);
+ if (!ct || !ct->master)
return ret;
- }
-
- read_lock_bh(&ip_conntrack_lock);
- if (!ct->master->helper) {
- DEBUGP("xt_helper: master ct %p has no helper\n",
- exp->expectant);
- goto out_unlock;
- }
-
- DEBUGP("master's name = %s , info->name = %s\n",
- ct->master->helper->name, info->name);
-
- if (info->name[0] == '\0')
- ret ^= 1;
- else
- ret ^= !strncmp(ct->master->helper->name, info->name,
- strlen(ct->master->helper->name));
-out_unlock:
- read_unlock_bh(&ip_conntrack_lock);
- return ret;
-}
-
-#else /* CONFIG_IP_NF_CONNTRACK */
-
-static int
-match(const struct sk_buff *skb,
- const struct net_device *in,
- const struct net_device *out,
- const struct xt_match *match,
- const void *matchinfo,
- int offset,
- unsigned int protoff,
- int *hotdrop)
-{
- const struct xt_helper_info *info = matchinfo;
- struct nf_conn *ct;
- struct nf_conn_help *master_help;
- enum ip_conntrack_info ctinfo;
- int ret = info->invert;
- ct = nf_ct_get((struct sk_buff *)skb, &ctinfo);
- if (!ct) {
- DEBUGP("xt_helper: Eek! invalid conntrack?\n");
+ master_help = nfct_help(ct->master);
+ if (!master_help)
return ret;
- }
- if (!ct->master) {
- DEBUGP("xt_helper: conntrack %p has no master\n", ct);
+ /* rcu_read_lock()ed by nf_hook_slow */
+ helper = rcu_dereference(master_help->helper);
+ if (!helper)
return ret;
- }
-
- read_lock_bh(&nf_conntrack_lock);
- master_help = nfct_help(ct->master);
- if (!master_help || !master_help->helper) {
- DEBUGP("xt_helper: master ct %p has no helper\n",
- exp->expectant);
- goto out_unlock;
- }
-
- DEBUGP("master's name = %s , info->name = %s\n",
- ct->master->helper->name, info->name);
if (info->name[0] == '\0')
- ret ^= 1;
+ ret = !ret;
else
ret ^= !strncmp(master_help->helper->name, info->name,
strlen(master_help->helper->name));
-out_unlock:
- read_unlock_bh(&nf_conntrack_lock);
return ret;
}
-#endif
-static int check(const char *tablename,
- const void *inf,
- const struct xt_match *match,
- void *matchinfo,
- unsigned int hook_mask)
+static bool check(const char *tablename,
+ const void *inf,
+ const struct xt_match *match,
+ void *matchinfo,
+ unsigned int hook_mask)
{
struct xt_helper_info *info = matchinfo;
if (nf_ct_l3proto_try_module_get(match->family) < 0) {
printk(KERN_WARNING "can't load conntrack support for "
"proto=%d\n", match->family);
- return 0;
+ return false;
}
info->name[29] = '\0';
- return 1;
+ return true;
}
static void
nf_ct_l3proto_module_put(match->family);
}
-static struct xt_match xt_helper_match[] = {
+static struct xt_match xt_helper_match[] __read_mostly = {
{
.name = "helper",
.family = AF_INET,