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Linux/net/netfilter/nf_log_netdev.c

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  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 */
 79 

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