Contributors: 10
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| James Morris |
304 |
63.87% |
2 |
7.14% |
| Jan Engelhardt |
95 |
19.96% |
14 |
50.00% |
| Patrick McHardy |
31 |
6.51% |
3 |
10.71% |
| Yasuyuki Kozakai |
17 |
3.57% |
1 |
3.57% |
| Florian Westphal |
14 |
2.94% |
3 |
10.71% |
| Pablo Neira Ayuso |
11 |
2.31% |
1 |
3.57% |
| Alexander A. Klimov |
1 |
0.21% |
1 |
3.57% |
| Alexey Dobriyan |
1 |
0.21% |
1 |
3.57% |
| Herbert Xu |
1 |
0.21% |
1 |
3.57% |
| Thomas Gleixner |
1 |
0.21% |
1 |
3.57% |
| Total |
476 |
|
28 |
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* This module is used to copy security markings from packets
* to connections, and restore security markings from connections
* back to packets. This would normally be performed in conjunction
* with the SECMARK target and state match.
*
* Based somewhat on CONNMARK:
* Copyright (C) 2002,2004 MARA Systems AB <https://www.marasystems.com>
* by Henrik Nordstrom <hno@marasystems.com>
*
* (C) 2006,2008 Red Hat, Inc., James Morris <jmorris@redhat.com>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_CONNSECMARK.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_ecache.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("James Morris <jmorris@redhat.com>");
MODULE_DESCRIPTION("Xtables: target for copying between connection and security mark");
MODULE_ALIAS("ipt_CONNSECMARK");
MODULE_ALIAS("ip6t_CONNSECMARK");
/*
* If the packet has a security mark and the connection does not, copy
* the security mark from the packet to the connection.
*/
static void secmark_save(const struct sk_buff *skb)
{
if (skb->secmark) {
struct nf_conn *ct;
enum ip_conntrack_info ctinfo;
ct = nf_ct_get(skb, &ctinfo);
if (ct && !ct->secmark) {
ct->secmark = skb->secmark;
nf_conntrack_event_cache(IPCT_SECMARK, ct);
}
}
}
/*
* If packet has no security mark, and the connection does, restore the
* security mark from the connection to the packet.
*/
static void secmark_restore(struct sk_buff *skb)
{
if (!skb->secmark) {
const struct nf_conn *ct;
enum ip_conntrack_info ctinfo;
ct = nf_ct_get(skb, &ctinfo);
if (ct && ct->secmark)
skb->secmark = ct->secmark;
}
}
static unsigned int
connsecmark_tg(struct sk_buff *skb, const struct xt_action_param *par)
{
const struct xt_connsecmark_target_info *info = par->targinfo;
switch (info->mode) {
case CONNSECMARK_SAVE:
secmark_save(skb);
break;
case CONNSECMARK_RESTORE:
secmark_restore(skb);
break;
default:
BUG();
}
return XT_CONTINUE;
}
static int connsecmark_tg_check(const struct xt_tgchk_param *par)
{
const struct xt_connsecmark_target_info *info = par->targinfo;
int ret;
if (strcmp(par->table, "mangle") != 0 &&
strcmp(par->table, "security") != 0) {
pr_info_ratelimited("only valid in \'mangle\' or \'security\' table, not \'%s\'\n",
par->table);
return -EINVAL;
}
switch (info->mode) {
case CONNSECMARK_SAVE:
case CONNSECMARK_RESTORE:
break;
default:
pr_info_ratelimited("invalid mode: %hu\n", info->mode);
return -EINVAL;
}
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;
}
static void connsecmark_tg_destroy(const struct xt_tgdtor_param *par)
{
nf_ct_netns_put(par->net, par->family);
}
static struct xt_target connsecmark_tg_reg __read_mostly = {
.name = "CONNSECMARK",
.revision = 0,
.family = NFPROTO_UNSPEC,
.checkentry = connsecmark_tg_check,
.destroy = connsecmark_tg_destroy,
.target = connsecmark_tg,
.targetsize = sizeof(struct xt_connsecmark_target_info),
.me = THIS_MODULE,
};
static int __init connsecmark_tg_init(void)
{
return xt_register_target(&connsecmark_tg_reg);
}
static void __exit connsecmark_tg_exit(void)
{
xt_unregister_target(&connsecmark_tg_reg);
}
module_init(connsecmark_tg_init);
module_exit(connsecmark_tg_exit);