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69f287ae CS |
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> | |
8827d90e | 20 | #include <net/inet_sock.h> |
69f287ae CS |
21 | #include "smack.h" |
22 | ||
23 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
24 | ||
06198b34 | 25 | static unsigned int smack_ipv6_output(void *priv, |
69f287ae | 26 | struct sk_buff *skb, |
238e54c9 | 27 | const struct nf_hook_state *state) |
69f287ae | 28 | { |
8827d90e | 29 | struct sock *sk = skb_to_full_sk(skb); |
69f287ae CS |
30 | struct socket_smack *ssp; |
31 | struct smack_known *skp; | |
32 | ||
8827d90e ED |
33 | if (sk && sk->sk_security) { |
34 | ssp = sk->sk_security; | |
69f287ae CS |
35 | skp = ssp->smk_out; |
36 | skb->secmark = skp->smk_secid; | |
37 | } | |
38 | ||
39 | return NF_ACCEPT; | |
40 | } | |
41 | #endif /* IPV6 */ | |
42 | ||
06198b34 | 43 | static unsigned int smack_ipv4_output(void *priv, |
69f287ae | 44 | struct sk_buff *skb, |
238e54c9 | 45 | const struct nf_hook_state *state) |
69f287ae | 46 | { |
8827d90e | 47 | struct sock *sk = skb_to_full_sk(skb); |
69f287ae CS |
48 | struct socket_smack *ssp; |
49 | struct smack_known *skp; | |
50 | ||
8827d90e ED |
51 | if (sk && sk->sk_security) { |
52 | ssp = sk->sk_security; | |
69f287ae CS |
53 | skp = ssp->smk_out; |
54 | skb->secmark = skp->smk_secid; | |
55 | } | |
56 | ||
57 | return NF_ACCEPT; | |
58 | } | |
59 | ||
60 | static struct nf_hook_ops smack_nf_ops[] = { | |
61 | { | |
62 | .hook = smack_ipv4_output, | |
69f287ae CS |
63 | .pf = NFPROTO_IPV4, |
64 | .hooknum = NF_INET_LOCAL_OUT, | |
65 | .priority = NF_IP_PRI_SELINUX_FIRST, | |
66 | }, | |
67 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
68 | { | |
69 | .hook = smack_ipv6_output, | |
69f287ae CS |
70 | .pf = NFPROTO_IPV6, |
71 | .hooknum = NF_INET_LOCAL_OUT, | |
72 | .priority = NF_IP6_PRI_SELINUX_FIRST, | |
73 | }, | |
74 | #endif /* IPV6 */ | |
75 | }; | |
76 | ||
77 | static int __init smack_nf_ip_init(void) | |
78 | { | |
79 | int err; | |
80 | ||
81 | if (smack_enabled == 0) | |
82 | return 0; | |
83 | ||
84 | printk(KERN_DEBUG "Smack: Registering netfilter hooks\n"); | |
85 | ||
86 | err = nf_register_hooks(smack_nf_ops, ARRAY_SIZE(smack_nf_ops)); | |
87 | if (err) | |
88 | pr_info("Smack: nf_register_hooks: error %d\n", err); | |
89 | ||
90 | return 0; | |
91 | } | |
92 | ||
93 | __initcall(smack_nf_ip_init); |