1 /* This is a module which is used to mark packets for tracing. 2 */ 3 #include <linux/module.h> 4 #include <linux/skbuff.h> 5 6 #include <linux/netfilter/x_tables.h> 7 #include <net/netfilter/nf_log.h> 8 9 MODULE_DESCRIPTION("Xtables: packet flow tracing"); 10 MODULE_LICENSE("GPL"); 11 MODULE_ALIAS("ipt_TRACE"); 12 MODULE_ALIAS("ip6t_TRACE"); 13 14 static int trace_tg_check(const struct xt_tgchk_param *par) 15 { 16 return nf_logger_find_get(par->family, NF_LOG_TYPE_LOG); 17 } 18 19 static void trace_tg_destroy(const struct xt_tgdtor_param *par) 20 { 21 nf_logger_put(par->family, NF_LOG_TYPE_LOG); 22 } 23 24 static unsigned int 25 trace_tg(struct sk_buff *skb, const struct xt_action_param *par) 26 { 27 skb->nf_trace = 1; 28 return XT_CONTINUE; 29 } 30 31 static struct xt_target trace_tg_reg __read_mostly = { 32 .name = "TRACE", 33 .revision = 0, 34 .family = NFPROTO_UNSPEC, 35 .table = "raw", 36 .target = trace_tg, 37 .checkentry = trace_tg_check, 38 .destroy = trace_tg_destroy, 39 .me = THIS_MODULE, 40 }; 41 42 static int __init trace_tg_init(void) 43 { 44 return xt_register_target(&trace_tg_reg); 45 } 46 47 static void __exit trace_tg_exit(void) 48 { 49 xt_unregister_target(&trace_tg_reg); 50 } 51 52 module_init(trace_tg_init); 53 module_exit(trace_tg_exit); 54