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Linux/net/netfilter/xt_devgroup.c

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  1 /*
  2  * Copyright (c) 2011 Patrick McHardy <kaber@trash.net>
  3  *
  4  * This program is free software; you can redistribute it and/or modify
  5  * it under the terms of the GNU General Public License version 2 as
  6  * published by the Free Software Foundation.
  7  */
  8 
  9 #include <linux/module.h>
 10 #include <linux/skbuff.h>
 11 #include <linux/netdevice.h>
 12 
 13 #include <linux/netfilter/xt_devgroup.h>
 14 #include <linux/netfilter/x_tables.h>
 15 
 16 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
 17 MODULE_LICENSE("GPL");
 18 MODULE_DESCRIPTION("Xtables: Device group match");
 19 MODULE_ALIAS("ipt_devgroup");
 20 MODULE_ALIAS("ip6t_devgroup");
 21 
 22 static bool devgroup_mt(const struct sk_buff *skb, struct xt_action_param *par)
 23 {
 24         const struct xt_devgroup_info *info = par->matchinfo;
 25 
 26         if (info->flags & XT_DEVGROUP_MATCH_SRC &&
 27             (((info->src_group ^ par->in->group) & info->src_mask ? 1 : 0) ^
 28              ((info->flags & XT_DEVGROUP_INVERT_SRC) ? 1 : 0)))
 29                 return false;
 30 
 31         if (info->flags & XT_DEVGROUP_MATCH_DST &&
 32             (((info->dst_group ^ par->out->group) & info->dst_mask ? 1 : 0) ^
 33              ((info->flags & XT_DEVGROUP_INVERT_DST) ? 1 : 0)))
 34                 return false;
 35 
 36         return true;
 37 }
 38 
 39 static int devgroup_mt_checkentry(const struct xt_mtchk_param *par)
 40 {
 41         const struct xt_devgroup_info *info = par->matchinfo;
 42 
 43         if (info->flags & ~(XT_DEVGROUP_MATCH_SRC | XT_DEVGROUP_INVERT_SRC |
 44                             XT_DEVGROUP_MATCH_DST | XT_DEVGROUP_INVERT_DST))
 45                 return -EINVAL;
 46 
 47         if (info->flags & XT_DEVGROUP_MATCH_SRC &&
 48             par->hook_mask & ~((1 << NF_INET_PRE_ROUTING) |
 49                                (1 << NF_INET_LOCAL_IN) |
 50                                (1 << NF_INET_FORWARD)))
 51                 return -EINVAL;
 52 
 53         if (info->flags & XT_DEVGROUP_MATCH_DST &&
 54             par->hook_mask & ~((1 << NF_INET_FORWARD) |
 55                                (1 << NF_INET_LOCAL_OUT) |
 56                                (1 << NF_INET_POST_ROUTING)))
 57                 return -EINVAL;
 58 
 59         return 0;
 60 }
 61 
 62 static struct xt_match devgroup_mt_reg __read_mostly = {
 63         .name           = "devgroup",
 64         .match          = devgroup_mt,
 65         .checkentry     = devgroup_mt_checkentry,
 66         .matchsize      = sizeof(struct xt_devgroup_info),
 67         .family         = NFPROTO_UNSPEC,
 68         .me             = THIS_MODULE
 69 };
 70 
 71 static int __init devgroup_mt_init(void)
 72 {
 73         return xt_register_match(&devgroup_mt_reg);
 74 }
 75 
 76 static void __exit devgroup_mt_exit(void)
 77 {
 78         xt_unregister_match(&devgroup_mt_reg);
 79 }
 80 
 81 module_init(devgroup_mt_init);
 82 module_exit(devgroup_mt_exit);
 83 

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