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