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