diff options
Diffstat (limited to 'net/netfilter/xt_cgroup.c')
-rw-r--r-- | net/netfilter/xt_cgroup.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/net/netfilter/xt_cgroup.c b/net/netfilter/xt_cgroup.c new file mode 100644 index 0000000..9a8e77e7 --- /dev/null +++ b/net/netfilter/xt_cgroup.c @@ -0,0 +1,71 @@ +/* + * Xtables module to match the process control group. + * + * Might be used to implement individual "per-application" firewall + * policies in contrast to global policies based on control groups. + * Matching is based upon processes tagged to net_cls' classid marker. + * + * (C) 2013 Daniel Borkmann <dborkman@redhat.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/skbuff.h> +#include <linux/module.h> +#include <linux/netfilter/x_tables.h> +#include <linux/netfilter/xt_cgroup.h> +#include <net/sock.h> + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Daniel Borkmann <dborkman@redhat.com>"); +MODULE_DESCRIPTION("Xtables: process control group matching"); +MODULE_ALIAS("ipt_cgroup"); +MODULE_ALIAS("ip6t_cgroup"); + +static int cgroup_mt_check(const struct xt_mtchk_param *par) +{ + struct xt_cgroup_info *info = par->matchinfo; + + if (info->invert & ~1) + return -EINVAL; + + return info->id ? 0 : -EINVAL; +} + +static bool +cgroup_mt(const struct sk_buff *skb, struct xt_action_param *par) +{ + const struct xt_cgroup_info *info = par->matchinfo; + + if (skb->sk == NULL) + return false; + + return (info->id == skb->sk->sk_classid) ^ info->invert; +} + +static struct xt_match cgroup_mt_reg __read_mostly = { + .name = "cgroup", + .revision = 0, + .family = NFPROTO_UNSPEC, + .checkentry = cgroup_mt_check, + .match = cgroup_mt, + .matchsize = sizeof(struct xt_cgroup_info), + .me = THIS_MODULE, + .hooks = (1 << NF_INET_LOCAL_OUT) | + (1 << NF_INET_POST_ROUTING), +}; + +static int __init cgroup_mt_init(void) +{ + return xt_register_match(&cgroup_mt_reg); +} + +static void __exit cgroup_mt_exit(void) +{ + xt_unregister_match(&cgroup_mt_reg); +} + +module_init(cgroup_mt_init); +module_exit(cgroup_mt_exit); |