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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2008
* Swinburne University of Technology, Melbourne, Australia.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Alias_sctp forms part of the libalias kernel module to handle
* Network Address Translation (NAT) for the SCTP protocol.
*
* This software was developed by David A. Hayes
* with leadership and advice from Jason But
*
* The design is outlined in CAIA technical report number 080618A
* (D. Hayes and J. But, "Alias_sctp Version 0.1: SCTP NAT implementation in IPFW")
*
* Development is part of the CAIA SONATA project,
* proposed by Jason But and Grenville Armitage:
* http://caia.swin.edu.au/urp/sonata/
*
*
* This project has been made possible in part by a grant from
* the Cisco University Research Program Fund at Community
* Foundation Silicon Valley.
*
*/
/* $FreeBSD$ */
#ifndef _ALIAS_SCTP_H_
#define _ALIAS_SCTP_H_
#include <sys/param.h>
#ifdef _KERNEL
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/uio.h>
#include <sys/socketvar.h>
#include <sys/syslog.h>
#endif // #ifdef _KERNEL
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/types.h>
#include <sys/time.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>
/**
* These are defined in sctp_os_bsd.h, but it can't be included due to its local file
* inclusion, so I'm defining them here.
*
*/
#include <machine/cpufunc.h>
/* The packed define for 64 bit platforms */
#ifndef SCTP_PACKED
#define SCTP_PACKED __attribute__((packed))
#endif //#ifndef SCTP_PACKED
#ifndef SCTP_UNUSED
#define SCTP_UNUSED __attribute__((unused))
#endif //#ifndef SCTP_UNUSED
#include <netinet/sctp.h>
//#include <netinet/sctp_os_bsd.h> --might be needed later for mbuf stuff
#include <netinet/sctp_header.h>
#ifndef _KERNEL
#include <stdlib.h>
#include <stdio.h>
#endif //#ifdef _KERNEL
#define LINK_SCTP IPPROTO_SCTP
#define SN_TO_LOCAL 0 /**< packet traveling from global to local */
#define SN_TO_GLOBAL 1 /**< packet traveling from local to global */
#define SN_TO_NODIR 99 /**< used where direction is not important */
#define SN_NAT_PKT 0x0000 /**< Network Address Translate packet */
#define SN_DROP_PKT 0x0001 /**< drop packet (don't forward it) */
#define SN_PROCESSING_ERROR 0x0003 /**< Packet processing error */
#define SN_REPLY_ABORT 0x0010 /**< Reply with ABORT to sender (don't forward it) */
#define SN_SEND_ABORT 0x0020 /**< Send ABORT to destination */
#define SN_TX_ABORT 0x0030 /**< mask for transmitting abort */
#define SN_REFLECT_ERROR 0x0100 /**< Reply with ERROR to sender on OOTB packet Tbit set */
#define SN_REPLY_ERROR 0x0200 /**< Reply with ERROR to sender on ASCONF clash */
#define SN_TX_ERROR 0x0300 /**< mask for transmitting error */
#define PKT_ALIAS_RESPOND 0x1000 /**< Signal to libalias that there is a response packet to send */
/*
* Data structures
*/
/**
* @brief sctp association information
*
* Structure that contains information about a particular sctp association
* currently under Network Address Translation.
* Information is stored in network byte order (as is libalias)***
*/
struct sctp_nat_assoc {
uint32_t l_vtag; /**< local side verification tag */
uint16_t l_port; /**< local side port number */
uint32_t g_vtag; /**< global side verification tag */
uint16_t g_port; /**< global side port number */
struct in_addr l_addr; /**< local ip address */
struct in_addr a_addr; /**< alias ip address */
int state; /**< current state of NAT association */
int TableRegister; /**< stores which look up tables association is registered in */
int exp; /**< timer expiration in seconds from uptime */
int exp_loc; /**< current location in timer_Q */
int num_Gaddr; /**< number of global IP addresses in the list */
LIST_HEAD(sctpGlobalAddresshead,sctp_GlobalAddress) Gaddr; /**< List of global addresses */
LIST_ENTRY (sctp_nat_assoc) list_L; /**< Linked list of pointers for Local table*/
LIST_ENTRY (sctp_nat_assoc) list_G; /**< Linked list of pointers for Global table */
LIST_ENTRY (sctp_nat_assoc) timer_Q; /**< Linked list of pointers for timer Q */
//Using libalias locking
};
struct sctp_GlobalAddress {
struct in_addr g_addr;
LIST_ENTRY (sctp_GlobalAddress) list_Gaddr; /**< Linked list of pointers for Global table */
};
/**
* @brief SCTP chunk of interest
*
* The only chunks whose contents are of any interest are the INIT and ASCONF_AddIP
*/
union sctpChunkOfInt {
struct sctp_init *Init; /**< Pointer to Init Chunk */
struct sctp_init_ack *InitAck; /**< Pointer to Init Chunk */
struct sctp_paramhdr *Asconf; /**< Pointer to ASCONF chunk */
};
/**
* @brief SCTP message
*
* Structure containing the relevant information from the SCTP message
*/
struct sctp_nat_msg {
uint16_t msg; /**< one of the key messages defined above */
#ifdef INET6
// struct ip6_hdr *ip_hdr; /**< pointer to ip packet header */ /*no inet6 support yet*/
#else
struct ip *ip_hdr; /**< pointer to ip packet header */
#endif //#ifdef INET6
struct sctphdr *sctp_hdr; /**< pointer to sctp common header */
union sctpChunkOfInt sctpchnk; /**< union of pointers to the chunk of interest */
int chunk_length; /**< length of chunk of interest */
};
/**
* @brief sctp nat timer queue structure
*
*/
struct sctp_nat_timer {
int loc_time; /**< time in seconds for the current location in the queue */
int cur_loc; /**< index of the current location in the circular queue */
LIST_HEAD(sctpTimerQ,sctp_nat_assoc) *TimerQ; /**< List of associations at this position in the timer Q */
};
#endif //#ifndef _ALIAS_SCTP_H
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