projects / deliverable / linux.git / blame
| 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); |