include/uapi/linux/netfilter_ipv4/ipt_ECN.h

   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 */