net/netfilter/nf_log_netdev.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * (C) 2016 by Pablo Neira Ayuso <pablo@netfilter.org>
   4  */
   5
   6 #include <linux/module.h>
   7 #include <linux/spinlock.h>
   8 #include <linux/skbuff.h>
   9 #include <linux/ip.h>
  10 #include <net/route.h>
  11
  12 #include <linux/netfilter.h>
  13 #include <net/netfilter/nf_log.h>
  14
  15 static void nf_log_netdev_packet(struct net *net, u_int8_t pf,
  16                                  unsigned int hooknum,
  17                                  const struct sk_buff *skb,
  18                                  const struct net_device *in,
  19                                  const struct net_device *out,
  20                                  const struct nf_loginfo *loginfo,
  21                                  const char *prefix)
  22 {
  23         nf_log_l2packet(net, pf, skb->protocol, hooknum, skb, in, out,
  24                         loginfo, prefix);
  25 }
  26
  27 static struct nf_logger nf_netdev_logger __read_mostly = {
  28         .name           = "nf_log_netdev",
  29         .type           = NF_LOG_TYPE_LOG,
  30         .logfn          = nf_log_netdev_packet,
  31         .me             = THIS_MODULE,
  32 };
  33
  34 static int __net_init nf_log_netdev_net_init(struct net *net)
  35 {
  36         return nf_log_set(net, NFPROTO_NETDEV, &nf_netdev_logger);
  37 }
  38
  39 static void __net_exit nf_log_netdev_net_exit(struct net *net)
  40 {
  41         nf_log_unset(net, &nf_netdev_logger);
  42 }
  43
  44 static struct pernet_operations nf_log_netdev_net_ops = {
  45         .init = nf_log_netdev_net_init,
  46         .exit = nf_log_netdev_net_exit,
  47 };
  48
  49 static int __init nf_log_netdev_init(void)
  50 {
  51         int ret;
  52
  53         /* Request to load the real packet loggers. */
  54         nf_logger_request_module(NFPROTO_IPV4, NF_LOG_TYPE_LOG);
  55         nf_logger_request_module(NFPROTO_IPV6, NF_LOG_TYPE_LOG);
  56         nf_logger_request_module(NFPROTO_ARP, NF_LOG_TYPE_LOG);
  57
  58         ret = register_pernet_subsys(&nf_log_netdev_net_ops);
  59         if (ret < 0)
  60                 return ret;
  61
  62         nf_log_register(NFPROTO_NETDEV, &nf_netdev_logger);
  63         return 0;
  64 }
  65
  66 static void __exit nf_log_netdev_exit(void)
  67 {
  68         unregister_pernet_subsys(&nf_log_netdev_net_ops);
  69         nf_log_unregister(&nf_netdev_logger);
  70 }
  71
  72 module_init(nf_log_netdev_init);
  73 module_exit(nf_log_netdev_exit);
  74
  75 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
  76 MODULE_DESCRIPTION("Netfilter netdev packet logging");
  77 MODULE_LICENSE("GPL");
  78 MODULE_ALIAS_NF_LOGGER(5, 0); /* NFPROTO_NETDEV */