ipt_ecn.h

这个linux源代码是很全面的~基本完整了~使用c编译的~由于时间问题我没有亲自测试~但就算用来做参考资料也是非常好的

/* Header file for iptables ipt_ECN target
 *
 * (C) 2002 by Harald Welte <[e-mail]>
 *
 * This software is distributed under GNU GPL v2, 1991
 * 
 * ipt_ECN.h,v 1.3 2002/05/29 12:17:40 laforge Exp
*/
#ifndef _IPT_ECN_TARGET_H
#define _IPT_ECN_TARGET_H
#include <linux/netfilter_ipv4/ipt_DSCP.h>

#define IPT_ECN_IP_MASK	(~IPT_DSCP_MASK)

#define IPT_ECN_OP_SET_IP	0x01	/* set ECN bits of IPv4 header */
#define IPT_ECN_OP_SET_ECE	0x10	/* set ECE bit of TCP header */
#define IPT_ECN_OP_SET_CWR	0x20	/* set CWR bit of TCP header */

#define IPT_ECN_OP_MASK		0xce

struct ipt_ECN_info {
	u_int8_t operation;	/* bitset of operations */
	u_int8_t ip_ect;	/* ECT codepoin