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Tip revision: 7e57714cd0ad2d5bb90e50b5096a0e671dec1ef3 authored by Linus Torvalds on 27 February 2022, 22:36:33 UTC
Linux 5.17-rc6
Linux 5.17-rc6
Tip revision: 7e57714
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);