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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1982, 1986, 1993, 1994, 1995
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
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* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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*/
#ifndef _NETINET_TCP_SYNCOOKIE_H_
#define _NETINET_TCP_SYNCOOKIE_H_
#include <netinet/tcp_var.h>
#include <sys/types.h>
#ifdef KERNEL_PRIVATE
void tcp_syncookie_init(void);
void tcp_syncookie_syn(struct tcp_inp *tpi, struct sockaddr *local, struct sockaddr *remote);
bool tcp_syncookie_ack(struct tcp_inp *tpi, struct socket **so2, int* dropsocket);
/*
* Flags for the Accurate ECN setup
*/
#define SC_ECN_SETUP 0x01 /* send classic ECN setup */
#define SC_ACE_SETUP_NOT_ECT 0x02 /* send ACE not-ECT setup */
#define SC_ACE_SETUP_ECT1 0x04 /* send ACE ECT1 setup */
#define SC_ACE_SETUP_ECT0 0x08 /* send ACE ECT0 setup */
#define SC_ACE_SETUP_CE 0x10 /* send ACE CE setup */
#define SYNCOOKIE_SECRET_SIZE 16
#define SYNCOOKIE_LIFETIME 15 /* seconds */
struct syncookie_secret {
volatile u_int oddeven;
uint8_t key[2][SYNCOOKIE_SECRET_SIZE];
uint32_t last_updated;
};
typedef union {
uint8_t cookie;
struct {
uint8_t odd_even:1,
sack_ok:1,
ecn_ok:1, /* Only needed for classic ECN */
wscale_idx:3,
mss_idx:2;
} flags;
} syncookie;
#endif /* KERNEL_PRIVATE */
#endif /* _NETINET_TCP_SYNCOOKIE_H_ */