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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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 16 
 17 #include <linux/skbuff.h>
 18 #include <linux/module.h>
 19 #include <linux/netfilter/x_tables.h>
 20 #include <linux/netfilter/xt_cgroup.h>
 21 #include <net/sock.h>
 22 
 23 MODULE_LICENSE("GPL");
 24 MODULE_AUTHOR("Daniel Borkmann <dborkman@redhat.com>");
 25 MODULE_DESCRIPTION("Xtables: process control group matching");
 26 MODULE_ALIAS("ipt_cgroup");
 27 MODULE_ALIAS("ip6t_cgroup");
 28 
 29 static int cgroup_mt_check_v0(const struct xt_mtchk_param *par)
 30 {
 31         struct xt_cgroup_info_v0 *info = par->matchinfo;
 32 
 33         if (info->invert & ~1)
 34                 return -EINVAL;
 35 
 36         return 0;
 37 }
 38 
 39 static int cgroup_mt_check_v1(const struct xt_mtchk_param *par)
 40 {
 41         struct xt_cgroup_info_v1 *info = par->matchinfo;
 42         struct cgroup *cgrp;
 43 
 44         if ((info->invert_path & ~1) || (info->invert_classid & ~1))
 45                 return -EINVAL;
 46 
 47         if (!info->has_path && !info->has_classid) {
 48                 pr_info("xt_cgroup: no path or classid specified\n");
 49                 return -EINVAL;
 50         }
 51 
 52         if (info->has_path && info->has_classid) {
 53                 pr_info_ratelimited("path and classid specified\n");
 54                 return -EINVAL;
 55         }
 56 
 57         info->priv = NULL;
 58         if (info->has_path) {
 59                 cgrp = cgroup_get_from_path(info->path);
 60                 if (IS_ERR(cgrp)) {
 61                         pr_info_ratelimited("invalid path, errno=%ld\n",
 62                                             PTR_ERR(cgrp));
 63                         return -EINVAL;
 64                 }
 65                 info->priv = cgrp;
 66         }
 67 
 68         return 0;
 69 }
 70 
 71 static bool
 72 cgroup_mt_v0(const struct sk_buff *skb, struct xt_action_param *par)
 73 {
 74         const struct xt_cgroup_info_v0 *info = par->matchinfo;
 75 
 76         if (skb->sk == NULL || !sk_fullsock(skb->sk))
 77                 return false;
 78 
 79         return (info->id == sock_cgroup_classid(&skb->sk->sk_cgrp_data)) ^
 80                 info->invert;
 81 }
 82 
 83 static bool cgroup_mt_v1(const struct sk_buff *skb, struct xt_action_param *par)
 84 {
 85         const struct xt_cgroup_info_v1 *info = par->matchinfo;
 86         struct sock_cgroup_data *skcd = &skb->sk->sk_cgrp_data;
 87         struct cgroup *ancestor = info->priv;
 88 
 89         if (!skb->sk || !sk_fullsock(skb->sk))
 90                 return false;
 91 
 92         if (ancestor)
 93                 return cgroup_is_descendant(sock_cgroup_ptr(skcd), ancestor) ^
 94                         info->invert_path;
 95         else
 96                 return (info->classid == sock_cgroup_classid(skcd)) ^
 97                         info->invert_classid;
 98 }
 99 
100 static void cgroup_mt_destroy_v1(const struct xt_mtdtor_param *par)
101 {
102         struct xt_cgroup_info_v1 *info = par->matchinfo;
103 
104         if (info->priv)
105                 cgroup_put(info->priv);
106 }
107 
108 static struct xt_match cgroup_mt_reg[] __read_mostly = {
109         {
110                 .name           = "cgroup",
111                 .revision       = 0,
112                 .family         = NFPROTO_UNSPEC,
113                 .checkentry     = cgroup_mt_check_v0,
114                 .match          = cgroup_mt_v0,
115                 .matchsize      = sizeof(struct xt_cgroup_info_v0),
116                 .me             = THIS_MODULE,
117                 .hooks          = (1 << NF_INET_LOCAL_OUT) |
118                                   (1 << NF_INET_POST_ROUTING) |
119                                   (1 << NF_INET_LOCAL_IN),
120         },
121         {
122                 .name           = "cgroup",
123                 .revision       = 1,
124                 .family         = NFPROTO_UNSPEC,
125                 .checkentry     = cgroup_mt_check_v1,
126                 .match          = cgroup_mt_v1,
127                 .matchsize      = sizeof(struct xt_cgroup_info_v1),
128                 .usersize       = offsetof(struct xt_cgroup_info_v1, priv),
129                 .destroy        = cgroup_mt_destroy_v1,
130                 .me             = THIS_MODULE,
131                 .hooks          = (1 << NF_INET_LOCAL_OUT) |
132                                   (1 << NF_INET_POST_ROUTING) |
133                                   (1 << NF_INET_LOCAL_IN),
134         },
135 };
136 
137 static int __init cgroup_mt_init(void)
138 {
139         return xt_register_matches(cgroup_mt_reg, ARRAY_SIZE(cgroup_mt_reg));
140 }
141 
142 static void __exit cgroup_mt_exit(void)
143 {
144         xt_unregister_matches(cgroup_mt_reg, ARRAY_SIZE(cgroup_mt_reg));
145 }
146 
147 module_init(cgroup_mt_init);
148 module_exit(cgroup_mt_exit);
149 

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