Contributors: 11
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Harald Welte |
162 |
39.90% |
6 |
16.22% |
| Jan Engelhardt |
64 |
15.76% |
13 |
35.14% |
| Yasuyuki Kozakai |
61 |
15.02% |
1 |
2.70% |
| Patrick McHardy |
54 |
13.30% |
8 |
21.62% |
| Pablo Neira Ayuso |
35 |
8.62% |
2 |
5.41% |
| Florian Westphal |
11 |
2.71% |
2 |
5.41% |
| Gao Feng |
8 |
1.97% |
1 |
2.70% |
| Art Haas |
5 |
1.23% |
1 |
2.70% |
| Andrew Morton |
3 |
0.74% |
1 |
2.70% |
| Thomas Gleixner |
2 |
0.49% |
1 |
2.70% |
| Aaron Conole |
1 |
0.25% |
1 |
2.70% |
| Total |
406 |
|
37 |
|
// SPDX-License-Identifier: GPL-2.0-only
/* iptables module to match on related connections */
/*
* (C) 2001 Martin Josefsson <gandalf@wlug.westbo.se>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/netfilter.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_helper.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Martin Josefsson <gandalf@netfilter.org>");
MODULE_DESCRIPTION("Xtables: Related connection matching");
MODULE_ALIAS("ipt_helper");
MODULE_ALIAS("ip6t_helper");
static bool
helper_mt(const struct sk_buff *skb, struct xt_action_param *par)
{
const struct xt_helper_info *info = par->matchinfo;
const struct nf_conn *ct;
const struct nf_conn_help *master_help;
const struct nf_conntrack_helper *helper;
enum ip_conntrack_info ctinfo;
bool ret = info->invert;
ct = nf_ct_get(skb, &ctinfo);
if (!ct || !ct->master)
return ret;
master_help = nfct_help(ct->master);
if (!master_help)
return ret;
/* rcu_read_lock()ed by nf_hook_thresh */
helper = rcu_dereference(master_help->helper);
if (!helper)
return ret;
if (info->name[0] == '\0')
ret = !ret;
else
ret ^= !strncmp(helper->name, info->name,
strlen(helper->name));
return ret;
}
static int helper_mt_check(const struct xt_mtchk_param *par)
{
struct xt_helper_info *info = par->matchinfo;
int ret;
ret = nf_ct_netns_get(par->net, par->family);
if (ret < 0) {
pr_info_ratelimited("cannot load conntrack support for proto=%u\n",
par->family);
return ret;
}
info->name[sizeof(info->name) - 1] = '\0';
return 0;
}
static void helper_mt_destroy(const struct xt_mtdtor_param *par)
{
nf_ct_netns_put(par->net, par->family);
}
static struct xt_match helper_mt_reg __read_mostly = {
.name = "helper",
.revision = 0,
.family = NFPROTO_UNSPEC,
.checkentry = helper_mt_check,
.match = helper_mt,
.destroy = helper_mt_destroy,
.matchsize = sizeof(struct xt_helper_info),
.me = THIS_MODULE,
};
static int __init helper_mt_init(void)
{
return xt_register_match(&helper_mt_reg);
}
static void __exit helper_mt_exit(void)
{
xt_unregister_match(&helper_mt_reg);
}
module_init(helper_mt_init);
module_exit(helper_mt_exit);