net/bridge/netfilter/nf_log_bridge.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * (C) 2014 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/if_bridge.h>
  10 #include <linux/ip.h>
  11 #include <net/route.h>
  12
  13 #include <linux/netfilter.h>
  14 #include <net/netfilter/nf_log.h>
  15
  16 static void nf_log_bridge_packet(struct net *net, u_int8_t pf,
  17                                  unsigned int hooknum,
  18                                  const struct sk_buff *skb,
  19                                  const struct net_device *in,
  20                                  const struct net_device *out,
  21                                  const struct nf_loginfo *loginfo,
  22                                  const char *prefix)
  23 {
  24         nf_log_l2packet(net, pf, eth_hdr(skb)->h_proto, hooknum, skb,
  25                         in, out, loginfo, prefix);
  26 }
  27
  28 static struct nf_logger nf_bridge_logger __read_mostly = {
  29         .name           = "nf_log_bridge",
  30         .type           = NF_LOG_TYPE_LOG,
  31         .logfn          = nf_log_bridge_packet,
  32         .me             = THIS_MODULE,
  33 };
  34
  35 static int __net_init nf_log_bridge_net_init(struct net *net)
  36 {
  37         return nf_log_set(net, NFPROTO_BRIDGE, &nf_bridge_logger);
  38 }
  39
  40 static void __net_exit nf_log_bridge_net_exit(struct net *net)
  41 {
  42         nf_log_unset(net, &nf_bridge_logger);
  43 }
  44
  45 static struct pernet_operations nf_log_bridge_net_ops = {
  46         .init = nf_log_bridge_net_init,
  47         .exit = nf_log_bridge_net_exit,
  48 };
  49
  50 static int __init nf_log_bridge_init(void)
  51 {
  52         int ret;
  53
  54         /* Request to load the real packet loggers. */
  55         nf_logger_request_module(NFPROTO_IPV4, NF_LOG_TYPE_LOG);
  56         nf_logger_request_module(NFPROTO_IPV6, NF_LOG_TYPE_LOG);
  57         nf_logger_request_module(NFPROTO_ARP, NF_LOG_TYPE_LOG);
  58
  59         ret = register_pernet_subsys(&nf_log_bridge_net_ops);
  60         if (ret < 0)
  61                 return ret;
  62
  63         nf_log_register(NFPROTO_BRIDGE, &nf_bridge_logger);
  64         return 0;
  65 }
  66
  67 static void __exit nf_log_bridge_exit(void)
  68 {
  69         unregister_pernet_subsys(&nf_log_bridge_net_ops);
  70         nf_log_unregister(&nf_bridge_logger);
  71 }
  72
  73 module_init(nf_log_bridge_init);
  74 module_exit(nf_log_bridge_exit);
  75
  76 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
  77 MODULE_DESCRIPTION("Netfilter bridge packet logging");
  78 MODULE_LICENSE("GPL");
  79 MODULE_ALIAS_NF_LOGGER(AF_BRIDGE, 0);