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Linux/net/netfilter/xt_cgroup.c

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  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_v0(const struct xt_mtchk_param *par)
 28 {
 29         struct xt_cgroup_info_v0 *info = par->matchinfo;
 30 
 31         if (info->invert & ~1)
 32                 return -EINVAL;
 33 
 34         return 0;
 35 }
 36 
 37 static int cgroup_mt_check_v1(const struct xt_mtchk_param *par)
 38 {
 39         struct xt_cgroup_info_v1 *info = par->matchinfo;
 40         struct cgroup *cgrp;
 41 
 42         if ((info->invert_path & ~1) || (info->invert_classid & ~1))
 43                 return -EINVAL;
 44 
 45         if (!info->has_path && !info->has_classid) {
 46                 pr_info("xt_cgroup: no path or classid specified\n");
 47                 return -EINVAL;
 48         }
 49 
 50         if (info->has_path && info->has_classid) {
 51                 pr_info("xt_cgroup: both path and classid specified\n");
 52                 return -EINVAL;
 53         }
 54 
 55         if (info->has_path) {
 56                 cgrp = cgroup_get_from_path(info->path);
 57                 if (IS_ERR(cgrp)) {
 58                         pr_info("xt_cgroup: invalid path, errno=%ld\n",
 59                                 PTR_ERR(cgrp));
 60                         return -EINVAL;
 61                 }
 62                 info->priv = cgrp;
 63         }
 64 
 65         return 0;
 66 }
 67 
 68 static bool
 69 cgroup_mt_v0(const struct sk_buff *skb, struct xt_action_param *par)
 70 {
 71         const struct xt_cgroup_info_v0 *info = par->matchinfo;
 72 
 73         if (skb->sk == NULL || !sk_fullsock(skb->sk))
 74                 return false;
 75 
 76         return (info->id == sock_cgroup_classid(&skb->sk->sk_cgrp_data)) ^
 77                 info->invert;
 78 }
 79 
 80 static bool cgroup_mt_v1(const struct sk_buff *skb, struct xt_action_param *par)
 81 {
 82         const struct xt_cgroup_info_v1 *info = par->matchinfo;
 83         struct sock_cgroup_data *skcd = &skb->sk->sk_cgrp_data;
 84         struct cgroup *ancestor = info->priv;
 85 
 86         if (!skb->sk || !sk_fullsock(skb->sk))
 87                 return false;
 88 
 89         if (ancestor)
 90                 return cgroup_is_descendant(sock_cgroup_ptr(skcd), ancestor) ^
 91                         info->invert_path;
 92         else
 93                 return (info->classid == sock_cgroup_classid(skcd)) ^
 94                         info->invert_classid;
 95 }
 96 
 97 static void cgroup_mt_destroy_v1(const struct xt_mtdtor_param *par)
 98 {
 99         struct xt_cgroup_info_v1 *info = par->matchinfo;
100 
101         if (info->priv)
102                 cgroup_put(info->priv);
103 }
104 
105 static struct xt_match cgroup_mt_reg[] __read_mostly = {
106         {
107                 .name           = "cgroup",
108                 .revision       = 0,
109                 .family         = NFPROTO_UNSPEC,
110                 .checkentry     = cgroup_mt_check_v0,
111                 .match          = cgroup_mt_v0,
112                 .matchsize      = sizeof(struct xt_cgroup_info_v0),
113                 .me             = THIS_MODULE,
114                 .hooks          = (1 << NF_INET_LOCAL_OUT) |
115                                   (1 << NF_INET_POST_ROUTING) |
116                                   (1 << NF_INET_LOCAL_IN),
117         },
118         {
119                 .name           = "cgroup",
120                 .revision       = 1,
121                 .family         = NFPROTO_UNSPEC,
122                 .checkentry     = cgroup_mt_check_v1,
123                 .match          = cgroup_mt_v1,
124                 .matchsize      = sizeof(struct xt_cgroup_info_v1),
125                 .destroy        = cgroup_mt_destroy_v1,
126                 .me             = THIS_MODULE,
127                 .hooks          = (1 << NF_INET_LOCAL_OUT) |
128                                   (1 << NF_INET_POST_ROUTING) |
129                                   (1 << NF_INET_LOCAL_IN),
130         },
131 };
132 
133 static int __init cgroup_mt_init(void)
134 {
135         return xt_register_matches(cgroup_mt_reg, ARRAY_SIZE(cgroup_mt_reg));
136 }
137 
138 static void __exit cgroup_mt_exit(void)
139 {
140         xt_unregister_matches(cgroup_mt_reg, ARRAY_SIZE(cgroup_mt_reg));
141 }
142 
143 module_init(cgroup_mt_init);
144 module_exit(cgroup_mt_exit);
145 

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