net/netfilter/nf_log_netdev.c

   1 /*
   2  * (C) 2016 by Pablo Neira Ayuso <pablo@netfilter.org>
   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/spinlock.h>
  11 #include <linux/skbuff.h>
  12 #include <linux/ip.h>
  13 #include <net/route.h>
  14
  15 #include <linux/netfilter.h>
  16 #include <net/netfilter/nf_log.h>
  17
  18 static void nf_log_netdev_packet(struct net *net, u_int8_t pf,
  19                                  unsigned int hooknum,
  20                                  const struct sk_buff *skb,
  21                                  const struct net_device *in,
  22                                  const struct net_device *out,
  23                                  const struct nf_loginfo *loginfo,
  24                                  const char *prefix)
  25 {
  26         nf_log_l2packet(net, pf, skb->protocol, hooknum, skb, in, out,
  27                         loginfo, prefix);
  28 }
  29
  30 static struct nf_logger nf_netdev_logger __read_mostly = {
  31         .name           = "nf_log_netdev",
  32         .type           = NF_LOG_TYPE_LOG,
  33         .logfn          = nf_log_netdev_packet,
  34         .me             = THIS_MODULE,
  35 };
  36
  37 static int __net_init nf_log_netdev_net_init(struct net *net)
  38 {
  39         return nf_log_set(net, NFPROTO_NETDEV, &nf_netdev_logger);
  40 }
  41
  42 static void __net_exit nf_log_netdev_net_exit(struct net *net)
  43 {
  44         nf_log_unset(net, &nf_netdev_logger);
  45 }
  46
  47 static struct pernet_operations nf_log_netdev_net_ops = {
  48         .init = nf_log_netdev_net_init,
  49         .exit = nf_log_netdev_net_exit,
  50 };
  51
  52 static int __init nf_log_netdev_init(void)
  53 {
  54         int ret;
  55
  56         /* Request to load the real packet loggers. */
  57         nf_logger_request_module(NFPROTO_IPV4, NF_LOG_TYPE_LOG);
  58         nf_logger_request_module(NFPROTO_IPV6, NF_LOG_TYPE_LOG);
  59         nf_logger_request_module(NFPROTO_ARP, NF_LOG_TYPE_LOG);
  60
  61         ret = register_pernet_subsys(&nf_log_netdev_net_ops);
  62         if (ret < 0)
  63                 return ret;
  64
  65         nf_log_register(NFPROTO_NETDEV, &nf_netdev_logger);
  66         return 0;
  67 }
  68
  69 static void __exit nf_log_netdev_exit(void)
  70 {
  71         unregister_pernet_subsys(&nf_log_netdev_net_ops);
  72         nf_log_unregister(&nf_netdev_logger);
  73 }
  74
  75 module_init(nf_log_netdev_init);
  76 module_exit(nf_log_netdev_exit);
  77
  78 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
  79 MODULE_DESCRIPTION("Netfilter netdev packet logging");
  80 MODULE_LICENSE("GPL");
  81 MODULE_ALIAS_NF_LOGGER(5, 0); /* NFPROTO_NETDEV */