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Linux/net/netfilter/xt_NFLOG.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * Copyright (c) 2006 Patrick McHardy <kaber@trash.net>
  4  */
  5 
  6 #include <linux/module.h>
  7 #include <linux/init.h>
  8 #include <linux/skbuff.h>
  9 
 10 #include <linux/netfilter/x_tables.h>
 11 #include <linux/netfilter/xt_NFLOG.h>
 12 #include <net/netfilter/nf_log.h>
 13 
 14 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
 15 MODULE_DESCRIPTION("Xtables: packet logging to netlink using NFLOG");
 16 MODULE_LICENSE("GPL");
 17 MODULE_ALIAS("ipt_NFLOG");
 18 MODULE_ALIAS("ip6t_NFLOG");
 19 
 20 static unsigned int
 21 nflog_tg(struct sk_buff *skb, const struct xt_action_param *par)
 22 {
 23         const struct xt_nflog_info *info = par->targinfo;
 24         struct net *net = xt_net(par);
 25         struct nf_loginfo li;
 26 
 27         li.type              = NF_LOG_TYPE_ULOG;
 28         li.u.ulog.copy_len   = info->len;
 29         li.u.ulog.group      = info->group;
 30         li.u.ulog.qthreshold = info->threshold;
 31         li.u.ulog.flags      = 0;
 32 
 33         if (info->flags & XT_NFLOG_F_COPY_LEN)
 34                 li.u.ulog.flags |= NF_LOG_F_COPY_LEN;
 35 
 36         nf_log_packet(net, xt_family(par), xt_hooknum(par), skb, xt_in(par),
 37                       xt_out(par), &li, "%s", info->prefix);
 38 
 39         return XT_CONTINUE;
 40 }
 41 
 42 static int nflog_tg_check(const struct xt_tgchk_param *par)
 43 {
 44         const struct xt_nflog_info *info = par->targinfo;
 45         int ret;
 46 
 47         if (info->flags & ~XT_NFLOG_MASK)
 48                 return -EINVAL;
 49         if (info->prefix[sizeof(info->prefix) - 1] != '\0')
 50                 return -EINVAL;
 51 
 52         ret = nf_logger_find_get(par->family, NF_LOG_TYPE_ULOG);
 53         if (ret != 0 && !par->nft_compat) {
 54                 request_module("%s", "nfnetlink_log");
 55 
 56                 ret = nf_logger_find_get(par->family, NF_LOG_TYPE_ULOG);
 57         }
 58 
 59         return ret;
 60 }
 61 
 62 static void nflog_tg_destroy(const struct xt_tgdtor_param *par)
 63 {
 64         nf_logger_put(par->family, NF_LOG_TYPE_ULOG);
 65 }
 66 
 67 static struct xt_target nflog_tg_reg __read_mostly = {
 68         .name       = "NFLOG",
 69         .revision   = 0,
 70         .family     = NFPROTO_UNSPEC,
 71         .checkentry = nflog_tg_check,
 72         .destroy    = nflog_tg_destroy,
 73         .target     = nflog_tg,
 74         .targetsize = sizeof(struct xt_nflog_info),
 75         .me         = THIS_MODULE,
 76 };
 77 
 78 static int __init nflog_tg_init(void)
 79 {
 80         return xt_register_target(&nflog_tg_reg);
 81 }
 82 
 83 static void __exit nflog_tg_exit(void)
 84 {
 85         xt_unregister_target(&nflog_tg_reg);
 86 }
 87 
 88 module_init(nflog_tg_init);
 89 module_exit(nflog_tg_exit);
 90 MODULE_SOFTDEP("pre: nfnetlink_log");
 91 

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