net/bridge/netfilter/ebt_nflog.c

   1 /*
   2  * ebt_nflog
   3  *
   4  *      Author:
   5  *      Peter Warasin <peter@endian.com>
   6  *
   7  *  February, 2008
   8  *
   9  * Based on:
  10  *  xt_NFLOG.c, (C) 2006 by Patrick McHardy <kaber@trash.net>
  11  *  ebt_ulog.c, (C) 2004 by Bart De Schuymer <bdschuym@pandora.be>
  12  *
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/spinlock.h>
  17 #include <linux/netfilter/x_tables.h>
  18 #include <linux/netfilter_bridge/ebtables.h>
  19 #include <linux/netfilter_bridge/ebt_nflog.h>
  20 #include <net/netfilter/nf_log.h>
  21
  22 static unsigned int
  23 ebt_nflog_tg(struct sk_buff *skb, const struct xt_action_param *par)
  24 {
  25         const struct ebt_nflog_info *info = par->targinfo;
  26         struct net *net = xt_net(par);
  27         struct nf_loginfo li;
  28
  29         li.type = NF_LOG_TYPE_ULOG;
  30         li.u.ulog.copy_len = info->len;
  31         li.u.ulog.group = info->group;
  32         li.u.ulog.qthreshold = info->threshold;
  33         li.u.ulog.flags = 0;
  34
  35         nf_log_packet(net, PF_BRIDGE, xt_hooknum(par), skb, xt_in(par),
  36                       xt_out(par), &li, "%s", info->prefix);
  37         return EBT_CONTINUE;
  38 }
  39
  40 static int ebt_nflog_tg_check(const struct xt_tgchk_param *par)
  41 {
  42         struct ebt_nflog_info *info = par->targinfo;
  43
  44         if (info->flags & ~EBT_NFLOG_MASK)
  45                 return -EINVAL;
  46         info->prefix[EBT_NFLOG_PREFIX_SIZE - 1] = '\0';
  47         return 0;
  48 }
  49
  50 static struct xt_target ebt_nflog_tg_reg __read_mostly = {
  51         .name       = "nflog",
  52         .revision   = 0,
  53         .family     = NFPROTO_BRIDGE,
  54         .target     = ebt_nflog_tg,
  55         .checkentry = ebt_nflog_tg_check,
  56         .targetsize = sizeof(struct ebt_nflog_info),
  57         .me         = THIS_MODULE,
  58 };
  59
  60 static int __init ebt_nflog_init(void)
  61 {
  62         return xt_register_target(&ebt_nflog_tg_reg);
  63 }
  64
  65 static void __exit ebt_nflog_fini(void)
  66 {
  67         xt_unregister_target(&ebt_nflog_tg_reg);
  68 }
  69
  70 module_init(ebt_nflog_init);
  71 module_exit(ebt_nflog_fini);
  72 MODULE_LICENSE("GPL");
  73 MODULE_AUTHOR("Peter Warasin <peter@endian.com>");
  74 MODULE_DESCRIPTION("ebtables NFLOG netfilter logging module");