net/bridge/netfilter/nf_log_bridge.c

   1 /*
   2  * (C) 2014 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/if_bridge.h>
  13 #include <linux/ip.h>
  14 #include <net/route.h>
  15
  16 #include <linux/netfilter.h>
  17 #include <net/netfilter/nf_log.h>
  18
  19 static void nf_log_bridge_packet(struct net *net, u_int8_t pf,
  20                                  unsigned int hooknum,
  21                                  const struct sk_buff *skb,
  22                                  const struct net_device *in,
  23                                  const struct net_device *out,
  24                                  const struct nf_loginfo *loginfo,
  25                                  const char *prefix)
  26 {
  27         nf_log_l2packet(net, pf, eth_hdr(skb)->h_proto, hooknum, skb,
  28                         in, out, loginfo, prefix);
  29 }
  30
  31 static struct nf_logger nf_bridge_logger __read_mostly = {
  32         .name           = "nf_log_bridge",
  33         .type           = NF_LOG_TYPE_LOG,
  34         .logfn          = nf_log_bridge_packet,
  35         .me             = THIS_MODULE,
  36 };
  37
  38 static int __net_init nf_log_bridge_net_init(struct net *net)
  39 {
  40         return nf_log_set(net, NFPROTO_BRIDGE, &nf_bridge_logger);
  41 }
  42
  43 static void __net_exit nf_log_bridge_net_exit(struct net *net)
  44 {
  45         nf_log_unset(net, &nf_bridge_logger);
  46 }
  47
  48 static struct pernet_operations nf_log_bridge_net_ops = {
  49         .init = nf_log_bridge_net_init,
  50         .exit = nf_log_bridge_net_exit,
  51         .async = true,
  52 };
  53
  54 static int __init nf_log_bridge_init(void)
  55 {
  56         int ret;
  57
  58         /* Request to load the real packet loggers. */
  59         nf_logger_request_module(NFPROTO_IPV4, NF_LOG_TYPE_LOG);
  60         nf_logger_request_module(NFPROTO_IPV6, NF_LOG_TYPE_LOG);
  61         nf_logger_request_module(NFPROTO_ARP, NF_LOG_TYPE_LOG);
  62
  63         ret = register_pernet_subsys(&nf_log_bridge_net_ops);
  64         if (ret < 0)
  65                 return ret;
  66
  67         nf_log_register(NFPROTO_BRIDGE, &nf_bridge_logger);
  68         return 0;
  69 }
  70
  71 static void __exit nf_log_bridge_exit(void)
  72 {
  73         unregister_pernet_subsys(&nf_log_bridge_net_ops);
  74         nf_log_unregister(&nf_bridge_logger);
  75 }
  76
  77 module_init(nf_log_bridge_init);
  78 module_exit(nf_log_bridge_exit);
  79
  80 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
  81 MODULE_DESCRIPTION("Netfilter bridge packet logging");
  82 MODULE_LICENSE("GPL");
  83 MODULE_ALIAS_NF_LOGGER(AF_BRIDGE, 0);