Contributors: 7
Author Tokens Token Proportion Commits Commit Proportion
Casey Schaufler 160 62.26% 5 38.46%
Florian Westphal 77 29.96% 3 23.08%
Eric Dumazet 13 5.06% 1 7.69%
Eric W. Biedermann 2 0.78% 1 7.69%
David S. Miller 2 0.78% 1 7.69%
Thomas Gleixner 2 0.78% 1 7.69%
Javier Martinez Canillas 1 0.39% 1 7.69%
Total 257 13 
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// 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) {
		ssp = smack_sock(sk);
		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);