1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 /* Header file for iptables ipt_ECN target
3  *
4  * (C) 2002 by Harald Welte <laforge@gnumonks.org>
5  *
6  * This software is distributed under GNU GPL v2, 1991
7  *
8  * ipt_ECN.h,v 1.3 2002/05/29 12:17:40 laforge Exp
9 */
10 #ifndef _IPT_ECN_TARGET_H
11 #define _IPT_ECN_TARGET_H
12 
13 #include <linux/types.h>
14 #include <linux/netfilter/xt_DSCP.h>
15 
16 #define IPT_ECN_IP_MASK	(~XT_DSCP_MASK)
17 
18 #define IPT_ECN_OP_SET_IP	0x01	/* set ECN bits of IPv4 header */
19 #define IPT_ECN_OP_SET_ECE	0x10	/* set ECE bit of TCP header */
20 #define IPT_ECN_OP_SET_CWR	0x20	/* set CWR bit of TCP header */
21 
22 #define IPT_ECN_OP_MASK		0xce
23 
24 struct ipt_ECN_info {
25 	__u8 operation;	/* bitset of operations */
26 	__u8 ip_ect;	/* ECT codepoint of IPv4 header, pre-shifted */
27 	union {
28 		struct {
29 			__u8 ece:1, cwr:1; /* TCP ECT bits */
30 		} tcp;
31 	} proto;
32 };
33 
34 #endif /* _IPT_ECN_TARGET_H */
35