// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Simplified MAC Kernel (smack) security module
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*
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* This file contains the Smack netfilter implementation
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*
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* Author:
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* Casey Schaufler <casey@schaufler-ca.com>
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*
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* Copyright (C) 2014 Casey Schaufler <casey@schaufler-ca.com>
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* Copyright (C) 2014 Intel Corporation.
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*/
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#include <linux/netfilter_ipv4.h>
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#include <linux/netfilter_ipv6.h>
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#include <linux/netdevice.h>
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#include <net/inet_sock.h>
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#include <net/net_namespace.h>
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#include "smack.h"
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#if IS_ENABLED(CONFIG_IPV6)
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static unsigned int smack_ipv6_output(void *priv,
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struct sk_buff *skb,
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const struct nf_hook_state *state)
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{
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struct sock *sk = skb_to_full_sk(skb);
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struct socket_smack *ssp;
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struct smack_known *skp;
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if (sk && sk->sk_security) {
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ssp = sk->sk_security;
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skp = ssp->smk_out;
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skb->secmark = skp->smk_secid;
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}
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return NF_ACCEPT;
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}
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#endif /* IPV6 */
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static unsigned int smack_ipv4_output(void *priv,
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struct sk_buff *skb,
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const struct nf_hook_state *state)
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{
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struct sock *sk = skb_to_full_sk(skb);
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struct socket_smack *ssp;
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struct smack_known *skp;
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if (sk && sk->sk_security) {
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ssp = sk->sk_security;
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skp = ssp->smk_out;
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skb->secmark = skp->smk_secid;
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}
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return NF_ACCEPT;
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}
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static const struct nf_hook_ops smack_nf_ops[] = {
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{
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.hook = smack_ipv4_output,
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.pf = NFPROTO_IPV4,
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.hooknum = NF_INET_LOCAL_OUT,
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.priority = NF_IP_PRI_SELINUX_FIRST,
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},
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#if IS_ENABLED(CONFIG_IPV6)
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{
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.hook = smack_ipv6_output,
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.pf = NFPROTO_IPV6,
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.hooknum = NF_INET_LOCAL_OUT,
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.priority = NF_IP6_PRI_SELINUX_FIRST,
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},
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#endif /* IPV6 */
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};
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static int __net_init smack_nf_register(struct net *net)
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{
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return nf_register_net_hooks(net, smack_nf_ops,
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ARRAY_SIZE(smack_nf_ops));
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}
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static void __net_exit smack_nf_unregister(struct net *net)
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{
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nf_unregister_net_hooks(net, smack_nf_ops, ARRAY_SIZE(smack_nf_ops));
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}
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static struct pernet_operations smack_net_ops = {
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.init = smack_nf_register,
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.exit = smack_nf_unregister,
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};
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static int __init smack_nf_ip_init(void)
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{
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if (smack_enabled == 0)
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return 0;
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printk(KERN_DEBUG "Smack: Registering netfilter hooks\n");
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return register_pernet_subsys(&smack_net_ops);
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}
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__initcall(smack_nf_ip_init);
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