1/*
  2 *  Simplified MAC Kernel (smack) security module
  3 *
  4 *  This file contains the Smack netfilter implementation
  5 *
  6 *  Author:
  7 *	Casey Schaufler <casey@schaufler-ca.com>
  8 *
  9 *  Copyright (C) 2014 Casey Schaufler <casey@schaufler-ca.com>
 10 *  Copyright (C) 2014 Intel Corporation.
 11 *
 12 *	This program is free software; you can redistribute it and/or modify
 13 *	it under the terms of the GNU General Public License version 2,
 14 *	as published by the Free Software Foundation.
 15 */
 16
 17#include <linux/netfilter_ipv4.h>
 18#include <linux/netfilter_ipv6.h>
 19#include <linux/netdevice.h>
 20#include <net/inet_sock.h>
 21#include <net/net_namespace.h>
 22#include "smack.h"
 23
 24#if IS_ENABLED(CONFIG_IPV6)
 25
 26static unsigned int smack_ipv6_output(void *priv,
 27					struct sk_buff *skb,
 28					const struct nf_hook_state *state)
 29{
 30	struct sock *sk = skb_to_full_sk(skb);
 31	struct socket_smack *ssp;
 32	struct smack_known *skp;
 33
 34	if (sk && sk->sk_security) {
 35		ssp = sk->sk_security;
 36		skp = ssp->smk_out;
 37		skb->secmark = skp->smk_secid;
 38	}
 39
 40	return NF_ACCEPT;
 41}
 42#endif	/* IPV6 */
 43
 44static unsigned int smack_ipv4_output(void *priv,
 45					struct sk_buff *skb,
 46					const struct nf_hook_state *state)
 47{
 48	struct sock *sk = skb_to_full_sk(skb);
 49	struct socket_smack *ssp;
 50	struct smack_known *skp;
 51
 52	if (sk && sk->sk_security) {
 53		ssp = sk->sk_security;
 54		skp = ssp->smk_out;
 55		skb->secmark = skp->smk_secid;
 56	}
 57
 58	return NF_ACCEPT;
 59}
 60
 61static const struct nf_hook_ops smack_nf_ops[] = {
 62	{
 63		.hook =		smack_ipv4_output,
 64		.pf =		NFPROTO_IPV4,
 65		.hooknum =	NF_INET_LOCAL_OUT,
 66		.priority =	NF_IP_PRI_SELINUX_FIRST,
 67	},
 68#if IS_ENABLED(CONFIG_IPV6)
 69	{
 70		.hook =		smack_ipv6_output,
 71		.pf =		NFPROTO_IPV6,
 72		.hooknum =	NF_INET_LOCAL_OUT,
 73		.priority =	NF_IP6_PRI_SELINUX_FIRST,
 74	},
 75#endif	/* IPV6 */
 76};
 77
 78static int __net_init smack_nf_register(struct net *net)
 79{
 80	return nf_register_net_hooks(net, smack_nf_ops,
 81				     ARRAY_SIZE(smack_nf_ops));
 82}
 83
 84static void __net_exit smack_nf_unregister(struct net *net)
 85{
 86	nf_unregister_net_hooks(net, smack_nf_ops, ARRAY_SIZE(smack_nf_ops));
 87}
 88
 89static struct pernet_operations smack_net_ops = {
 90	.init = smack_nf_register,
 91	.exit = smack_nf_unregister,
 92};
 93
 94static int __init smack_nf_ip_init(void)
 95{
 96	if (smack_enabled == 0)
 97		return 0;
 98
 99	printk(KERN_DEBUG "Smack: Registering netfilter hooks\n");
100	return register_pernet_subsys(&smack_net_ops);
101}
102
103__initcall(smack_nf_ip_init);

 1// SPDX-License-Identifier: GPL-2.0-only
 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.
 
 
 
 
12 */
13
14#include <linux/netfilter_ipv4.h>
15#include <linux/netfilter_ipv6.h>
16#include <linux/netdevice.h>
17#include <net/inet_sock.h>
18#include <net/net_namespace.h>
19#include "smack.h"
20
21static unsigned int smack_ip_output(void *priv,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
22					struct sk_buff *skb,
23					const struct nf_hook_state *state)
24{
25	struct sock *sk = skb_to_full_sk(skb);
26	struct socket_smack *ssp;
27	struct smack_known *skp;
28
29	if (sk && sk->sk_security) {
30		ssp = sk->sk_security;
31		skp = ssp->smk_out;
32		skb->secmark = skp->smk_secid;
33	}
34
35	return NF_ACCEPT;
36}
37
38static const struct nf_hook_ops smack_nf_ops[] = {
39	{
40		.hook =		smack_ip_output,
41		.pf =		NFPROTO_IPV4,
42		.hooknum =	NF_INET_LOCAL_OUT,
43		.priority =	NF_IP_PRI_SELINUX_FIRST,
44	},
45#if IS_ENABLED(CONFIG_IPV6)
46	{
47		.hook =		smack_ip_output,
48		.pf =		NFPROTO_IPV6,
49		.hooknum =	NF_INET_LOCAL_OUT,
50		.priority =	NF_IP6_PRI_SELINUX_FIRST,
51	},
52#endif	/* IPV6 */
53};
54
55static 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
61static void __net_exit smack_nf_unregister(struct net *net)
62{
63	nf_unregister_net_hooks(net, smack_nf_ops, ARRAY_SIZE(smack_nf_ops));
64}
65
66static struct pernet_operations smack_net_ops = {
67	.init = smack_nf_register,
68	.exit = smack_nf_unregister,
69};
70
71static int __init smack_nf_ip_init(void)
72{
73	if (smack_enabled == 0)
74		return 0;
75
76	printk(KERN_DEBUG "Smack: Registering netfilter hooks\n");
77	return register_pernet_subsys(&smack_net_ops);
78}
79
80__initcall(smack_nf_ip_init);