1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * ebt_nflog 4 * 5 * Author: 6 * Peter Warasin <peter@endian.com> 7 * 8 * February, 2008 9 * 10 * Based on: 11 * xt_NFLOG.c, (C) 2006 by Patrick McHardy <kaber@trash.net> 12 * ebt_ulog.c, (C) 2004 by Bart De Schuymer <bdschuym@pandora.be> 13 * 14 */ 15 16 #include <linux/module.h> 17 #include <linux/spinlock.h> 18 #include <linux/netfilter/x_tables.h> 19 #include <linux/netfilter_bridge/ebtables.h> 20 #include <linux/netfilter_bridge/ebt_nflog.h> 21 #include <net/netfilter/nf_log.h> 22 23 static unsigned int 24 ebt_nflog_tg(struct sk_buff *skb, const struct xt_action_param *par) 25 { 26 const struct ebt_nflog_info *info = par->targinfo; 27 struct net *net = xt_net(par); 28 struct nf_loginfo li; 29 30 li.type = NF_LOG_TYPE_ULOG; 31 li.u.ulog.copy_len = info->len; 32 li.u.ulog.group = info->group; 33 li.u.ulog.qthreshold = info->threshold; 34 li.u.ulog.flags = 0; 35 36 nf_log_packet(net, PF_BRIDGE, xt_hooknum(par), skb, xt_in(par), 37 xt_out(par), &li, "%s", info->prefix); 38 return EBT_CONTINUE; 39 } 40 41 static int ebt_nflog_tg_check(const struct xt_tgchk_param *par) 42 { 43 struct ebt_nflog_info *info = par->targinfo; 44 45 if (info->flags & ~EBT_NFLOG_MASK) 46 return -EINVAL; 47 info->prefix[EBT_NFLOG_PREFIX_SIZE - 1] = '\0'; 48 return 0; 49 } 50 51 static struct xt_target ebt_nflog_tg_reg __read_mostly = { 52 .name = "nflog", 53 .revision = 0, 54 .family = NFPROTO_BRIDGE, 55 .target = ebt_nflog_tg, 56 .checkentry = ebt_nflog_tg_check, 57 .targetsize = sizeof(struct ebt_nflog_info), 58 .me = THIS_MODULE, 59 }; 60 61 static int __init ebt_nflog_init(void) 62 { 63 return xt_register_target(&ebt_nflog_tg_reg); 64 } 65 66 static void __exit ebt_nflog_fini(void) 67 { 68 xt_unregister_target(&ebt_nflog_tg_reg); 69 } 70 71 module_init(ebt_nflog_init); 72 module_exit(ebt_nflog_fini); 73 MODULE_LICENSE("GPL"); 74 MODULE_AUTHOR("Peter Warasin <peter@endian.com>"); 75 MODULE_DESCRIPTION("ebtables NFLOG netfilter logging module"); 76