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Linux/net/netfilter/xt_NFLOG.c

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  1 /*
  2  * Copyright (c) 2006 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/init.h>
 11 #include <linux/skbuff.h>
 12 
 13 #include <linux/netfilter/x_tables.h>
 14 #include <linux/netfilter/xt_NFLOG.h>
 15 #include <net/netfilter/nf_log.h>
 16 
 17 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
 18 MODULE_DESCRIPTION("Xtables: packet logging to netlink using NFLOG");
 19 MODULE_LICENSE("GPL");
 20 MODULE_ALIAS("ipt_NFLOG");
 21 MODULE_ALIAS("ip6t_NFLOG");
 22 
 23 static unsigned int
 24 nflog_tg(struct sk_buff *skb, const struct xt_action_param *par)
 25 {
 26         const struct xt_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         if (info->flags & XT_NFLOG_F_COPY_LEN)
 37                 li.u.ulog.flags |= NF_LOG_F_COPY_LEN;
 38 
 39         nf_log_packet(net, xt_family(par), xt_hooknum(par), skb, xt_in(par),
 40                       xt_out(par), &li, "%s", info->prefix);
 41 
 42         return XT_CONTINUE;
 43 }
 44 
 45 static int nflog_tg_check(const struct xt_tgchk_param *par)
 46 {
 47         const struct xt_nflog_info *info = par->targinfo;
 48 
 49         if (info->flags & ~XT_NFLOG_MASK)
 50                 return -EINVAL;
 51         if (info->prefix[sizeof(info->prefix) - 1] != '\0')
 52                 return -EINVAL;
 53 
 54         return nf_logger_find_get(par->family, NF_LOG_TYPE_ULOG);
 55 }
 56 
 57 static void nflog_tg_destroy(const struct xt_tgdtor_param *par)
 58 {
 59         nf_logger_put(par->family, NF_LOG_TYPE_ULOG);
 60 }
 61 
 62 static struct xt_target nflog_tg_reg __read_mostly = {
 63         .name       = "NFLOG",
 64         .revision   = 0,
 65         .family     = NFPROTO_UNSPEC,
 66         .checkentry = nflog_tg_check,
 67         .destroy    = nflog_tg_destroy,
 68         .target     = nflog_tg,
 69         .targetsize = sizeof(struct xt_nflog_info),
 70         .me         = THIS_MODULE,
 71 };
 72 
 73 static int __init nflog_tg_init(void)
 74 {
 75         return xt_register_target(&nflog_tg_reg);
 76 }
 77 
 78 static void __exit nflog_tg_exit(void)
 79 {
 80         xt_unregister_target(&nflog_tg_reg);
 81 }
 82 
 83 module_init(nflog_tg_init);
 84 module_exit(nflog_tg_exit);
 85 

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