net/bridge/netfilter/ebt_nflog.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * ebt_nflog
   4  *
   5  *      Author:
   6  *      Peter Warasin <peter@endian.com>
   7  *
   8  *  February, 2008
   9  *
  10  * Based on:
  11  *  xt_NFLOG.c, (C) 2006 by Patrick McHardy <kaber@trash.net>
  12  *  ebt_ulog.c, (C) 2004 by Bart De Schuymer <bdschuym@pandora.be>
  13  *
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/spinlock.h>
  18 #include <linux/netfilter/x_tables.h>
  19 #include <linux/netfilter_bridge/ebtables.h>
  20 #include <linux/netfilter_bridge/ebt_nflog.h>
  21 #include <net/netfilter/nf_log.h>
  22
  23 static unsigned int
  24 ebt_nflog_tg(struct sk_buff *skb, const struct xt_action_param *par)
  25 {
  26         const struct ebt_nflog_info *info = par->targinfo;
  27         struct net *net = xt_net(par);
  28         struct nf_loginfo li;
  29
  30         li.type = NF_LOG_TYPE_ULOG;
  31         li.u.ulog.copy_len = info->len;
  32         li.u.ulog.group = info->group;
  33         li.u.ulog.qthreshold = info->threshold;
  34         li.u.ulog.flags = 0;
  35
  36         nf_log_packet(net, PF_BRIDGE, xt_hooknum(par), skb, xt_in(par),
  37                       xt_out(par), &li, "%s", info->prefix);
  38         return EBT_CONTINUE;
  39 }
  40
  41 static int ebt_nflog_tg_check(const struct xt_tgchk_param *par)
  42 {
  43         struct ebt_nflog_info *info = par->targinfo;
  44
  45         if (info->flags & ~EBT_NFLOG_MASK)
  46                 return -EINVAL;
  47         info->prefix[EBT_NFLOG_PREFIX_SIZE - 1] = '\0';
  48         return 0;
  49 }
  50
  51 static struct xt_target ebt_nflog_tg_reg __read_mostly = {
  52         .name       = "nflog",
  53         .revision   = 0,
  54         .family     = NFPROTO_BRIDGE,
  55         .target     = ebt_nflog_tg,
  56         .checkentry = ebt_nflog_tg_check,
  57         .targetsize = sizeof(struct ebt_nflog_info),
  58         .me         = THIS_MODULE,
  59 };
  60
  61 static int __init ebt_nflog_init(void)
  62 {
  63         return xt_register_target(&ebt_nflog_tg_reg);
  64 }
  65
  66 static void __exit ebt_nflog_fini(void)
  67 {
  68         xt_unregister_target(&ebt_nflog_tg_reg);
  69 }
  70
  71 module_init(ebt_nflog_init);
  72 module_exit(ebt_nflog_fini);
  73 MODULE_LICENSE("GPL");
  74 MODULE_AUTHOR("Peter Warasin <peter@endian.com>");
  75 MODULE_DESCRIPTION("ebtables NFLOG netfilter logging module");