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