78a6b08618
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. No functional change intended.
198 lines
6.9 KiB
C
198 lines
6.9 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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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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