mirror of
https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
synced 2024-10-19 09:59:04 +00:00
65b4b4e81a
Every netfilter module uses `init' for its module_init() function and `fini' or `cleanup' for its module_exit() function. Problem is, this creates uninformative initcall_debug output and makes ctags rather useless. So go through and rename them all to $(filename)_init and $(filename)_fini. Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: David S. Miller <davem@davemloft.net>
209 lines
5 KiB
C
209 lines
5 KiB
C
/* iptables module to match on related connections */
|
|
/*
|
|
* (C) 2001 Martin Josefsson <gandalf@wlug.westbo.se>
|
|
*
|
|
* 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>
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Martin Josefsson <gandalf@netfilter.org>");
|
|
MODULE_DESCRIPTION("iptables helper match module");
|
|
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
|
|
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 ip_conntrack *ct;
|
|
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;
|
|
}
|
|
|
|
if (!ct->master) {
|
|
DEBUGP("xt_helper: conntrack %p has no master\n", ct);
|
|
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");
|
|
return ret;
|
|
}
|
|
|
|
if (!ct->master) {
|
|
DEBUGP("xt_helper: conntrack %p has no master\n", ct);
|
|
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;
|
|
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 matchsize,
|
|
unsigned int hook_mask)
|
|
{
|
|
struct xt_helper_info *info = matchinfo;
|
|
|
|
#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
|
|
if (nf_ct_l3proto_try_module_get(match->family) < 0) {
|
|
printk(KERN_WARNING "can't load nf_conntrack support for "
|
|
"proto=%d\n", match->family);
|
|
return 0;
|
|
}
|
|
#endif
|
|
info->name[29] = '\0';
|
|
return 1;
|
|
}
|
|
|
|
static void
|
|
destroy(const struct xt_match *match, void *matchinfo, unsigned int matchsize)
|
|
{
|
|
#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
|
|
nf_ct_l3proto_module_put(match->family);
|
|
#endif
|
|
}
|
|
|
|
static struct xt_match helper_match = {
|
|
.name = "helper",
|
|
.match = match,
|
|
.matchsize = sizeof(struct xt_helper_info),
|
|
.checkentry = check,
|
|
.destroy = destroy,
|
|
.family = AF_INET,
|
|
.me = THIS_MODULE,
|
|
};
|
|
static struct xt_match helper6_match = {
|
|
.name = "helper",
|
|
.match = match,
|
|
.matchsize = sizeof(struct xt_helper_info),
|
|
.checkentry = check,
|
|
.destroy = destroy,
|
|
.family = AF_INET6,
|
|
.me = THIS_MODULE,
|
|
};
|
|
|
|
static int __init xt_helper_init(void)
|
|
{
|
|
int ret;
|
|
need_conntrack();
|
|
|
|
ret = xt_register_match(&helper_match);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = xt_register_match(&helper6_match);
|
|
if (ret < 0)
|
|
xt_unregister_match(&helper_match);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void __exit xt_helper_fini(void)
|
|
{
|
|
xt_unregister_match(&helper_match);
|
|
xt_unregister_match(&helper6_match);
|
|
}
|
|
|
|
module_init(xt_helper_init);
|
|
module_exit(xt_helper_fini);
|
|
|