[linux-2.6-block.git] / security / smack / smack_netfilter.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  Simplified MAC Kernel (smack) security module
 *
 *  This file contains the Smack netfilter implementation
 *
 *  Author:
 *	Casey Schaufler <casey@schaufler-ca.com>
 *
 *  Copyright (C) 2014 Casey Schaufler <casey@schaufler-ca.com>
 *  Copyright (C) 2014 Intel Corporation.
 */

#include <linux/netfilter_ipv4.h>
#include <linux/netfilter_ipv6.h>
#include <linux/netdevice.h>
#include <net/inet_sock.h>
#include <net/net_namespace.h>
#include "smack.h"

static unsigned int smack_ip_output(void *priv,
					struct sk_buff *skb,
					const struct nf_hook_state *state)
{
	struct sock *sk = skb_to_full_sk(skb);
	struct socket_smack *ssp;
	struct smack_known *skp;

	if (sk && sk->sk_security) {
		ssp = sk->sk_security;
		skp = ssp->smk_out;
		skb->secmark = skp->smk_secid;
	}

	return NF_ACCEPT;
}

static const struct nf_hook_ops smack_nf_ops[] = {
	{
		.hook =		smack_ip_output,
		.pf =		NFPROTO_IPV4,
		.hooknum =	NF_INET_LOCAL_OUT,
		.priority =	NF_IP_PRI_SELINUX_FIRST,
	},
#if IS_ENABLED(CONFIG_IPV6)
	{
		.hook =		smack_ip_output,
		.pf =		NFPROTO_IPV6,
		.hooknum =	NF_INET_LOCAL_OUT,
		.priority =	NF_IP6_PRI_SELINUX_FIRST,
	},
#endif	/* IPV6 */
};

static int __net_init smack_nf_register(struct net *net)
{
	return nf_register_net_hooks(net, smack_nf_ops,
				     ARRAY_SIZE(smack_nf_ops));
}

static void __net_exit smack_nf_unregister(struct net *net)
{
	nf_unregister_net_hooks(net, smack_nf_ops, ARRAY_SIZE(smack_nf_ops));
}

static struct pernet_operations smack_net_ops = {
	.init = smack_nf_register,
	.exit = smack_nf_unregister,
};

static int __init smack_nf_ip_init(void)
{
	if (smack_enabled == 0)
		return 0;

	printk(KERN_DEBUG "Smack: Registering netfilter hooks\n");
	return register_pernet_subsys(&smack_net_ops);
}

__initcall(smack_nf_ip_init);
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
69f287ae CS	2	/*
	3	* Simplified MAC Kernel (smack) security module
	4	*
	5	* This file contains the Smack netfilter implementation
	6	*
	7	* Author:
	8	* Casey Schaufler <casey@schaufler-ca.com>
	9	*
	10	* Copyright (C) 2014 Casey Schaufler <casey@schaufler-ca.com>
	11	* Copyright (C) 2014 Intel Corporation.
69f287ae CS	12	*/
	13
	14	#include <linux/netfilter_ipv4.h>
	15	#include <linux/netfilter_ipv6.h>
	16	#include <linux/netdevice.h>
8827d90e	17	#include <net/inet_sock.h>
e661a582	18	#include <net/net_namespace.h>
69f287ae CS	19	#include "smack.h"
69f287ae CS	20
f8de49ef	21	static unsigned int smack_ip_output(void *priv,
69f287ae	22	struct sk_buff *skb,
238e54c9	23	const struct nf_hook_state *state)
69f287ae	24	{
8827d90e	25	struct sock *sk = skb_to_full_sk(skb);
69f287ae CS	26	struct socket_smack *ssp;
	27	struct smack_known *skp;
	28
8827d90e ED	29	if (sk && sk->sk_security) {
8827d90e ED	30	ssp = sk->sk_security;
69f287ae CS	31	skp = ssp->smk_out;
	32	skb->secmark = skp->smk_secid;
	33	}
	34
	35	return NF_ACCEPT;
	36	}
	37
591bb278	38	static const struct nf_hook_ops smack_nf_ops[] = {
69f287ae	39	{
f8de49ef	40	.hook = smack_ip_output,
69f287ae CS	41	.pf = NFPROTO_IPV4,
	42	.hooknum = NF_INET_LOCAL_OUT,
	43	.priority = NF_IP_PRI_SELINUX_FIRST,
	44	},
1a93a6ea	45	#if IS_ENABLED(CONFIG_IPV6)
69f287ae	46	{
f8de49ef	47	.hook = smack_ip_output,
69f287ae CS	48	.pf = NFPROTO_IPV6,
	49	.hooknum = NF_INET_LOCAL_OUT,
	50	.priority = NF_IP6_PRI_SELINUX_FIRST,
	51	},
	52	#endif /* IPV6 */
	53	};
	54
e661a582 FW	55	static int __net_init smack_nf_register(struct net *net)
	56	{
	57	return nf_register_net_hooks(net, smack_nf_ops,
	58	ARRAY_SIZE(smack_nf_ops));
	59	}
	60
	61	static void __net_exit smack_nf_unregister(struct net *net)
69f287ae	62	{
e661a582 FW	63	nf_unregister_net_hooks(net, smack_nf_ops, ARRAY_SIZE(smack_nf_ops));
e661a582 FW	64	}
69f287ae	65
e661a582 FW	66	static struct pernet_operations smack_net_ops = {
	67	.init = smack_nf_register,
	68	.exit = smack_nf_unregister,
	69	};
	70
	71	static int __init smack_nf_ip_init(void)
	72	{
69f287ae CS	73	if (smack_enabled == 0)
	74	return 0;
	75
	76	printk(KERN_DEBUG "Smack: Registering netfilter hooks\n");
e661a582	77	return register_pernet_subsys(&smack_net_ops);
69f287ae CS	78	}
	79
	80	__initcall(smack_nf_ip_init);