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 19static 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 44static 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 51static 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 57static void __net_exit nf_log_bridge_net_exit(struct net *net) 58{ 59 nf_log_unset(net, &nf_bridge_logger); 60} 61 62static struct pernet_operations nf_log_bridge_net_ops = { 63 .init = nf_log_bridge_net_init, 64 .exit = nf_log_bridge_net_exit, 65}; 66 67static 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 84static 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 90module_init(nf_log_bridge_init); 91module_exit(nf_log_bridge_exit); 92 93MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); 94MODULE_DESCRIPTION("Netfilter bridge packet logging"); 95MODULE_LICENSE("GPL"); 96MODULE_ALIAS_NF_LOGGER(AF_BRIDGE, 0); 97