Release 4.11 net/netfilter/xt_helper.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.
*/
#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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Yasuyuki Kozakai | 104 | 67.10% | 1 | 10.00% |
| Patrick McHardy | 22 | 14.19% | 1 | 10.00% |
| Harald Welte | 16 | 10.32% | 2 | 20.00% |
| Jan Engelhardt | 12 | 7.74% | 5 | 50.00% |
| Aaron Conole | 1 | 0.65% | 1 | 10.00% |
| Total | 155 | 100.00% | 10 | 100.00% |
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("cannot load conntrack support for proto=%u\n",
par->family);
return ret;
}
info->name[sizeof(info->name) - 1] = '\0';
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jan Engelhardt | 23 | 30.26% | 6 | 50.00% |
| Harald Welte | 23 | 30.26% | 2 | 16.67% |
| Pablo Neira Ayuso | 15 | 19.74% | 1 | 8.33% |
| Gao Feng | 8 | 10.53% | 1 | 8.33% |
| Florian Westphal | 5 | 6.58% | 1 | 8.33% |
| Patrick McHardy | 2 | 2.63% | 1 | 8.33% |
| Total | 76 | 100.00% | 12 | 100.00% |
static void helper_mt_destroy(const struct xt_mtdtor_param *par)
{
nf_ct_netns_put(par->net, par->family);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Pablo Neira Ayuso | 13 | 56.52% | 1 | 25.00% |
| Jan Engelhardt | 5 | 21.74% | 2 | 50.00% |
| Florian Westphal | 5 | 21.74% | 1 | 25.00% |
| Total | 23 | 100.00% | 4 | 100.00% |
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Harald Welte | 11 | 68.75% | 1 | 25.00% |
| Jan Engelhardt | 4 | 25.00% | 2 | 50.00% |
| Patrick McHardy | 1 | 6.25% | 1 | 25.00% |
| Total | 16 | 100.00% | 4 | 100.00% |
static void __exit helper_mt_exit(void)
{
xt_unregister_match(&helper_mt_reg);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Harald Welte | 10 | 66.67% | 2 | 40.00% |
| Jan Engelhardt | 4 | 26.67% | 2 | 40.00% |
| Patrick McHardy | 1 | 6.67% | 1 | 20.00% |
| Total | 15 | 100.00% | 5 | 100.00% |
module_init(helper_mt_init);
module_exit(helper_mt_exit);
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Harald Welte | 127 | 31.36% | 5 | 15.62% |
| Yasuyuki Kozakai | 113 | 27.90% | 1 | 3.12% |
| Jan Engelhardt | 65 | 16.05% | 13 | 40.62% |
| Patrick McHardy | 40 | 9.88% | 6 | 18.75% |
| Pablo Neira Ayuso | 35 | 8.64% | 2 | 6.25% |
| Florian Westphal | 10 | 2.47% | 1 | 3.12% |
| Gao Feng | 8 | 1.98% | 1 | 3.12% |
| Art Haas | 5 | 1.23% | 1 | 3.12% |
| Andrew Morton | 1 | 0.25% | 1 | 3.12% |
| Aaron Conole | 1 | 0.25% | 1 | 3.12% |
| Total | 405 | 100.00% | 32 | 100.00% |
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