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 void ebt_nflog(const struct sk_buff *skb,
  23                       unsigned int hooknr,
  24                       const struct net_device *in,
  25                       const struct net_device *out,
  26                       const void *data, unsigned int datalen)
  27 {
  28         struct ebt_nflog_info *info = (struct ebt_nflog_info *)data;
  29         struct nf_loginfo li;
  30
  31         li.type = NF_LOG_TYPE_ULOG;
  32         li.u.ulog.copy_len = info->len;
  33         li.u.ulog.group = info->group;
  34         li.u.ulog.qthreshold = info->threshold;
  35
  36         nf_log_packet(PF_BRIDGE, hooknr, skb, in, out, &li, "%s", info->prefix);
  37 }
  38
  39 static int ebt_nflog_check(const char *tablename,
  40                            unsigned int hookmask,
  41                            const struct ebt_entry *e,
  42                            void *data, unsigned int datalen)
  43 {
  44         struct ebt_nflog_info *info = (struct ebt_nflog_info *)data;
  45
  46         if (info->flags & ~EBT_NFLOG_MASK)
  47                 return -EINVAL;
  48         info->prefix[EBT_NFLOG_PREFIX_SIZE - 1] = '\0';
  49         return 0;
  50 }
  51
  52 static struct ebt_watcher nflog __read_mostly = {
  53         .name = EBT_NFLOG_WATCHER,
  54         .watcher = ebt_nflog,
  55         .check = ebt_nflog_check,
  56         .targetsize = XT_ALIGN(sizeof(struct ebt_nflog_info)),
  57         .me = THIS_MODULE,
  58 };
  59
  60 static int __init ebt_nflog_init(void)
  61 {
  62         return ebt_register_watcher(&nflog);
  63 }
  64
  65 static void __exit ebt_nflog_fini(void)
  66 {
  67         ebt_unregister_watcher(&nflog);
  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");