/*- * SPDX-License-Identifier: BSD-2-Clause * * 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. * */ #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
