kernel/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         switch (eth_hdr(skb)->h_proto) {
  28         case htons(ETH_P_IP):
  29                 nf_log_packet(net, NFPROTO_IPV4, hooknum, skb, in, out,
  30                               loginfo, "%s", prefix);
  31                 break;
  32         case htons(ETH_P_IPV6):
  33                 nf_log_packet(net, NFPROTO_IPV6, hooknum, skb, in, out,
  34                               loginfo, "%s", prefix);
  35                 break;
  36         case htons(ETH_P_ARP):
  37         case htons(ETH_P_RARP):
  38                 nf_log_packet(net, NFPROTO_ARP, hooknum, skb, in, out,
  39                               loginfo, "%s", prefix);
  40                 break;
  41         }
  42 }
  43
  44 static struct nf_logger nf_bridge_logger __read_mostly = {
  45         .name           = "nf_log_bridge",
  46         .type           = NF_LOG_TYPE_LOG,
  47         .logfn          = nf_log_bridge_packet,
  48         .me             = THIS_MODULE,
  49 };
  50
  51 static int __net_init nf_log_bridge_net_init(struct net *net)
  52 {
  53         nf_log_set(net, NFPROTO_BRIDGE, &nf_bridge_logger);
  54         return 0;
  55 }
  56
  57 static void __net_exit nf_log_bridge_net_exit(struct net *net)
  58 {
  59         nf_log_unset(net, &nf_bridge_logger);
  60 }
  61
  62 static struct pernet_operations nf_log_bridge_net_ops = {
  63         .init = nf_log_bridge_net_init,
  64         .exit = nf_log_bridge_net_exit,
  65 };
  66
  67 static int __init nf_log_bridge_init(void)
  68 {
  69         int ret;
  70
  71         /* Request to load the real packet loggers. */
  72         nf_logger_request_module(NFPROTO_IPV4, NF_LOG_TYPE_LOG);
  73         nf_logger_request_module(NFPROTO_IPV6, NF_LOG_TYPE_LOG);
  74         nf_logger_request_module(NFPROTO_ARP, NF_LOG_TYPE_LOG);
  75
  76         ret = register_pernet_subsys(&nf_log_bridge_net_ops);
  77         if (ret < 0)
  78                 return ret;
  79
  80         nf_log_register(NFPROTO_BRIDGE, &nf_bridge_logger);
  81         return 0;
  82 }
  83
  84 static void __exit nf_log_bridge_exit(void)
  85 {
  86         unregister_pernet_subsys(&nf_log_bridge_net_ops);
  87         nf_log_unregister(&nf_bridge_logger);
  88 }
  89
  90 module_init(nf_log_bridge_init);
  91 module_exit(nf_log_bridge_exit);
  92
  93 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
  94 MODULE_DESCRIPTION("Netfilter bridge packet logging");
  95 MODULE_LICENSE("GPL");
  96 MODULE_ALIAS_NF_LOGGER(AF_BRIDGE, 0);