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 */