projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 82a37132 DB |
1 | /* |
| 2 | * Xtables module to match the process control group. | |
| 3 | * | |
| 4 | * Might be used to implement individual "per-application" firewall | |
| 5 | * policies in contrast to global policies based on control groups. | |
| 6 | * Matching is based upon processes tagged to net_cls' classid marker. | |
| 7 | * | |
| 8 | * (C) 2013 Daniel Borkmann <dborkman@redhat.com> | |
| 9 | * | |
| 10 | * This program is free software; you can redistribute it and/or modify | |
| 11 | * it under the terms of the GNU General Public License version 2 as | |
| 12 | * published by the Free Software Foundation. | |
| 13 | */ | |
| 14 | ||
| 15 | #include <linux/skbuff.h> | |
| 16 | #include <linux/module.h> | |
| 17 | #include <linux/netfilter/x_tables.h> | |
| 18 | #include <linux/netfilter/xt_cgroup.h> | |
| 19 | #include <net/sock.h> | |
| 20 | ||
| 21 | MODULE_LICENSE("GPL"); | |
| 22 | MODULE_AUTHOR("Daniel Borkmann <dborkman@redhat.com>"); | |
| 23 | MODULE_DESCRIPTION("Xtables: process control group matching"); | |
| 24 | MODULE_ALIAS("ipt_cgroup"); | |
| 25 | MODULE_ALIAS("ip6t_cgroup"); | |
| 26 | ||
| 27 | static int cgroup_mt_check(const struct xt_mtchk_param *par) | |
| 28 | { | |
| 29 | struct xt_cgroup_info *info = par->matchinfo; | |
| 30 | ||
| 31 | if (info->invert & ~1) | |
| 32 | return -EINVAL; | |
| 33 | ||
| caa8ad94 | 34 | return 0; |
| 82a37132 DB |
35 | } |
| 36 | ||
| 37 | static bool | |
| 38 | cgroup_mt(const struct sk_buff *skb, struct xt_action_param *par) | |
| 39 | { | |
| 40 | const struct xt_cgroup_info *info = par->matchinfo; | |
| 41 | ||
| afb77180 | 42 | if (skb->sk == NULL || !sk_fullsock(skb->sk)) |
| 82a37132 DB |
43 | return false; |
| 44 | ||
| 45 | return (info->id == skb->sk->sk_classid) ^ info->invert; | |
| 46 | } | |
| 47 | ||
| 48 | static struct xt_match cgroup_mt_reg __read_mostly = { | |
| 49 | .name = "cgroup", | |
| 50 | .revision = 0, | |
| 51 | .family = NFPROTO_UNSPEC, | |
| 52 | .checkentry = cgroup_mt_check, | |
| 53 | .match = cgroup_mt, | |
| 54 | .matchsize = sizeof(struct xt_cgroup_info), | |
| 55 | .me = THIS_MODULE, | |
| 56 | .hooks = (1 << NF_INET_LOCAL_OUT) | | |
| a00e7634 AP |
57 | (1 << NF_INET_POST_ROUTING) | |
| 58 | (1 << NF_INET_LOCAL_IN), | |
| 82a37132 DB |
59 | }; |
| 60 | ||
| 61 | static int __init cgroup_mt_init(void) | |
| 62 | { | |
| 63 | return xt_register_match(&cgroup_mt_reg); | |
| 64 | } | |
| 65 | ||
| 66 | static void __exit cgroup_mt_exit(void) | |
| 67 | { | |
| 68 | xt_unregister_match(&cgroup_mt_reg); | |
| 69 | } | |
| 70 | ||
| 71 | module_init(cgroup_mt_init); | |
| 72 | module_exit(cgroup_mt_exit); |