| 1 | /*-
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| 2 | * Copyright (c) 2001 Charles Mott <cm@linktel.net>
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | * 1. Redistributions of source code must retain the above copyright
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| 9 | * notice, this list of conditions and the following disclaimer.
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer in the
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| 12 | * documentation and/or other materials provided with the distribution.
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| 13 | *
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| 14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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| 15 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 17 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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| 18 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 19 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 20 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 21 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 22 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 23 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 24 | * SUCH DAMAGE.
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| 25 | *
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| 26 | * $FreeBSD: src/sys/netinet/libalias/alias_local.h,v 1.34.2.1.4.1 2009/04/15 03:14:26 kensmith Exp $
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| 27 | */
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| 28 |
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| 29 | /*
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| 30 | * Alias_local.h contains the function prototypes for alias.c,
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| 31 | * alias_db.c, alias_util.c and alias_ftp.c, alias_irc.c (as well
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| 32 | * as any future add-ons). It also includes macros, globals and
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| 33 | * struct definitions shared by more than one alias*.c file.
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| 34 | *
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| 35 | * This include file is intended to be used only within the aliasing
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| 36 | * software. Outside world interfaces are defined in alias.h
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| 37 | *
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| 38 | * This software is placed into the public domain with no restrictions
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| 39 | * on its distribution.
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| 40 | *
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| 41 | * Initial version: August, 1996 (cjm)
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| 42 | *
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| 43 | * <updated several times by original author and Eivind Eklund>
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| 44 | */
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| 45 |
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| 46 | #ifndef _ALIAS_LOCAL_H_
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| 47 | #define _ALIAS_LOCAL_H_
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| 48 |
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| 49 | #ifndef VBOX
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| 50 | #include <sys/types.h>
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| 51 | #include <sys/sysctl.h>
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| 52 |
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| 53 | #ifdef _KERNEL
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| 54 | #include <sys/malloc.h>
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| 55 | #include <sys/param.h>
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| 56 | #include <sys/lock.h>
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| 57 | #include <sys/mutex.h>
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| 58 |
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| 59 | /* XXX: LibAliasSetTarget() uses this constant. */
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| 60 | #define INADDR_NONE 0xffffffff
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| 61 | #endif
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| 62 | #else /* VBOX */
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| 63 | # include <slirp.h>
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| 64 | #endif /* VBOX */
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| 65 |
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| 66 | /* Sizes of input and output link tables */
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| 67 | #define LINK_TABLE_OUT_SIZE 4001
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| 68 | #define LINK_TABLE_IN_SIZE 4001
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| 69 |
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| 70 | struct proxy_entry;
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| 71 |
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| 72 | struct libalias {
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| 73 | LIST_ENTRY(libalias) instancelist;
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| 74 |
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| 75 | int packetAliasMode; /* Mode flags */
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| 76 | /* - documented in alias.h */
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| 77 |
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| 78 | struct in_addr aliasAddress; /* Address written onto source */
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| 79 | /* field of IP packet. */
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| 80 |
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| 81 | struct in_addr targetAddress; /* IP address incoming packets */
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| 82 | /* are sent to if no aliasing */
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| 83 | /* link already exists */
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| 84 |
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| 85 | struct in_addr nullAddress; /* Used as a dummy parameter for */
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| 86 | /* some function calls */
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| 87 |
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| 88 | LIST_HEAD (RT_NOTHING, alias_link) linkTableOut[LINK_TABLE_OUT_SIZE];
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| 89 | /* Lookup table of pointers to */
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| 90 | /* chains of link records. Each */
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| 91 |
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| 92 | LIST_HEAD (RT_NOTHING, alias_link) linkTableIn[LINK_TABLE_IN_SIZE];
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| 93 | /* link record is doubly indexed */
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| 94 | /* into input and output lookup */
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| 95 | /* tables. */
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| 96 |
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| 97 | /* Link statistics */
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| 98 | int icmpLinkCount;
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| 99 | int udpLinkCount;
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| 100 | int tcpLinkCount;
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| 101 | int pptpLinkCount;
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| 102 | int protoLinkCount;
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| 103 | int fragmentIdLinkCount;
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| 104 | int fragmentPtrLinkCount;
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| 105 | int sockCount;
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| 106 |
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| 107 | int cleanupIndex; /* Index to chain of link table */
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| 108 | /* being inspected for old links */
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| 109 | #ifndef VBOX
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| 110 | int timeStamp; /* System time in seconds for */
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| 111 | /* current packet */
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| 112 |
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| 113 | int lastCleanupTime; /* Last time
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| 114 | * IncrementalCleanup() */
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| 115 | #else
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| 116 | unsigned int timeStamp; /* System time in seconds for */
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| 117 | unsigned int lastCleanupTime; /* Last time */
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| 118 | #endif
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| 119 | /* was called */
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| 120 |
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| 121 | int deleteAllLinks; /* If equal to zero, DeleteLink() */
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| 122 | /* will not remove permanent links */
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| 123 |
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| 124 | /* log descriptor */
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| 125 | #ifdef _KERNEL
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| 126 | char *logDesc;
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| 127 | #else
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| 128 | FILE *logDesc;
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| 129 | #endif
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| 130 | /* statistics monitoring */
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| 131 |
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| 132 | int newDefaultLink; /* Indicates if a new aliasing */
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| 133 | /* link has been created after a */
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| 134 | /* call to PacketAliasIn/Out(). */
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| 135 |
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| 136 | #ifndef NO_FW_PUNCH
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| 137 | int fireWallFD; /* File descriptor to be able to */
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| 138 | /* control firewall. Opened by */
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| 139 | /* PacketAliasSetMode on first */
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| 140 | /* setting the PKT_ALIAS_PUNCH_FW */
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| 141 | /* flag. */
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| 142 | int fireWallBaseNum; /* The first firewall entry
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| 143 | * free for our use */
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| 144 | int fireWallNumNums; /* How many entries can we
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| 145 | * use? */
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| 146 | int fireWallActiveNum; /* Which entry did we last
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| 147 | * use? */
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| 148 | char *fireWallField; /* bool array for entries */
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| 149 | #endif
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| 150 |
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| 151 | unsigned int skinnyPort; /* TCP port used by the Skinny */
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| 152 | /* protocol. */
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| 153 |
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| 154 | struct proxy_entry *proxyList;
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| 155 |
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| 156 | struct in_addr true_addr; /* in network byte order. */
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| 157 | u_short true_port; /* in host byte order. */
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| 158 | #if defined(_KERNEL) && !defined(VBOX)
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| 159 | /*
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| 160 | * avoid races in libalias: every public function has to use it.
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| 161 | */
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| 162 | struct mtx mutex;
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| 163 | #endif
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| 164 | #ifdef VBOX
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| 165 | PNATState pData;
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| 166 | #endif
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| 167 | };
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| 168 |
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| 169 | /* Macros */
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| 170 |
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| 171 | #if defined(_KERNEL) && !defined(VBOX)
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| 172 | #define LIBALIAS_LOCK_INIT(l) \
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| 173 | mtx_init(&l->mutex, "per-instance libalias mutex", NULL, MTX_DEF)
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| 174 | #define LIBALIAS_LOCK_ASSERT(l) mtx_assert(&l->mutex, MA_OWNED)
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| 175 | #define LIBALIAS_LOCK(l) mtx_lock(&l->mutex)
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| 176 | #define LIBALIAS_UNLOCK(l) mtx_unlock(&l->mutex)
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| 177 | #define LIBALIAS_LOCK_DESTROY(l) mtx_destroy(&l->mutex)
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| 178 | #else
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| 179 | #define LIBALIAS_LOCK_INIT(l)
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| 180 | #define LIBALIAS_LOCK_ASSERT(l)
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| 181 | #define LIBALIAS_LOCK(l) NOREF((l));
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| 182 | #define LIBALIAS_UNLOCK(l) NOREF((l))
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| 183 | #define LIBALIAS_LOCK_DESTROY(l)
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| 184 | #endif
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| 185 |
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| 186 | /*
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| 187 | * The following macro is used to update an
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| 188 | * internet checksum. "delta" is a 32-bit
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| 189 | * accumulation of all the changes to the
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| 190 | * checksum (adding in new 16-bit words and
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| 191 | * subtracting out old words), and "cksum"
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| 192 | * is the checksum value to be updated.
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| 193 | */
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| 194 | #define ADJUST_CHECKSUM(acc, cksum) \
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| 195 | do { \
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| 196 | acc += cksum; \
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| 197 | if (acc < 0) { \
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| 198 | acc = -acc; \
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| 199 | acc = (acc >> 16) + (acc & 0xffff); \
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| 200 | acc += acc >> 16; \
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| 201 | cksum = (u_short) ~acc; \
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| 202 | } else { \
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| 203 | acc = (acc >> 16) + (acc & 0xffff); \
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| 204 | acc += acc >> 16; \
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| 205 | cksum = (u_short) acc; \
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| 206 | } \
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| 207 | } while (0)
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| 208 |
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| 209 |
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| 210 | /* Prototypes */
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| 211 |
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| 212 | /*
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| 213 | * We do not calculate TCP checksums when libalias is a kernel
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| 214 | * module, since it has no idea about checksum offloading.
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| 215 | * If TCP data has changed, then we just set checksum to zero,
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| 216 | * and caller must recalculate it himself.
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| 217 | * In case if libalias will edit UDP data, the same approach
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| 218 | * should be used.
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| 219 | */
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| 220 | #ifndef _KERNEL
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| 221 | u_short IpChecksum(struct ip *_pip);
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| 222 | u_short TcpChecksum(struct ip *_pip);
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| 223 | #endif
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| 224 | void
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| 225 | DifferentialChecksum(u_short * _cksum, void * _new, void * _old, int _n);
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| 226 |
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| 227 | /* Internal data access */
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| 228 | struct alias_link *
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| 229 | FindIcmpIn(struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr,
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| 230 | u_short _id_alias, int _create);
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| 231 | struct alias_link *
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| 232 | FindIcmpOut(struct libalias *la, struct in_addr _src_addr, struct in_addr _dst_addr,
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| 233 | u_short _id, int _create);
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| 234 | struct alias_link *
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| 235 | FindFragmentIn1(struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr,
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| 236 | u_short _ip_id);
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| 237 | struct alias_link *
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| 238 | FindFragmentIn2(struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr,
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| 239 | u_short _ip_id);
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| 240 | struct alias_link *
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| 241 | AddFragmentPtrLink(struct libalias *la, struct in_addr _dst_addr, u_short _ip_id);
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| 242 | struct alias_link *
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| 243 | FindFragmentPtr(struct libalias *la, struct in_addr _dst_addr, u_short _ip_id);
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| 244 | struct alias_link *
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| 245 | FindProtoIn(struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr,
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| 246 | u_char _proto);
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| 247 | struct alias_link *
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| 248 | FindProtoOut(struct libalias *la, struct in_addr _src_addr, struct in_addr _dst_addr,
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| 249 | u_char _proto);
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| 250 | struct alias_link *
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| 251 | FindUdpTcpIn(struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr,
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| 252 | u_short _dst_port, u_short _alias_port, u_char _proto, int _create);
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| 253 | struct alias_link *
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| 254 | FindUdpTcpOut(struct libalias *la, struct in_addr _src_addr, struct in_addr _dst_addr,
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| 255 | u_short _src_port, u_short _dst_port, u_char _proto, int _create);
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| 256 | struct alias_link *
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| 257 | AddPptp(struct libalias *la, struct in_addr _src_addr, struct in_addr _dst_addr,
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| 258 | struct in_addr _alias_addr, u_int16_t _src_call_id);
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| 259 | struct alias_link *
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| 260 | FindPptpOutByCallId(struct libalias *la, struct in_addr _src_addr,
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| 261 | struct in_addr _dst_addr, u_int16_t _src_call_id);
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| 262 | struct alias_link *
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| 263 | FindPptpInByCallId(struct libalias *la, struct in_addr _dst_addr,
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| 264 | struct in_addr _alias_addr, u_int16_t _dst_call_id);
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| 265 | struct alias_link *
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| 266 | FindPptpOutByPeerCallId(struct libalias *la, struct in_addr _src_addr,
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| 267 | struct in_addr _dst_addr, u_int16_t _dst_call_id);
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| 268 | struct alias_link *
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| 269 | FindPptpInByPeerCallId(struct libalias *la, struct in_addr _dst_addr,
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| 270 | struct in_addr _alias_addr, u_int16_t _alias_call_id);
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| 271 | struct alias_link *
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| 272 | FindRtspOut(struct libalias *la, struct in_addr _src_addr, struct in_addr _dst_addr,
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| 273 | u_short _src_port, u_short _alias_port, u_char _proto);
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| 274 | struct in_addr
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| 275 | FindOriginalAddress(struct libalias *la, struct in_addr _alias_addr);
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| 276 | struct in_addr
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| 277 | FindAliasAddress(struct libalias *la, struct in_addr _original_addr);
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| 278 |
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| 279 | /* External data access/modification */
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| 280 | int
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| 281 | FindNewPortGroup(struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr,
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| 282 | u_short _src_port, u_short _dst_port, u_short _port_count,
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| 283 | u_char _proto, u_char _align);
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| 284 | void GetFragmentAddr(struct alias_link *_lnk, struct in_addr *_src_addr);
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| 285 | void SetFragmentAddr(struct alias_link *_lnk, struct in_addr _src_addr);
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| 286 | void GetFragmentPtr(struct alias_link *_lnk, char **_fptr);
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| 287 | void SetFragmentPtr(struct alias_link *_lnk, char *fptr);
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| 288 | void SetStateIn(struct alias_link *_lnk, int _state);
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| 289 | void SetStateOut(struct alias_link *_lnk, int _state);
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| 290 | int GetStateIn (struct alias_link *_lnk);
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| 291 | int GetStateOut(struct alias_link *_lnk);
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| 292 | struct in_addr
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| 293 | GetOriginalAddress(struct alias_link *_lnk);
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| 294 | struct in_addr
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| 295 | GetDestAddress(struct alias_link *_lnk);
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| 296 | struct in_addr
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| 297 | GetAliasAddress(struct alias_link *_lnk);
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| 298 | struct in_addr
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| 299 | GetDefaultAliasAddress(struct libalias *la);
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| 300 | void SetDefaultAliasAddress(struct libalias *la, struct in_addr _alias_addr);
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| 301 | u_short GetOriginalPort(struct alias_link *_lnk);
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| 302 | u_short GetAliasPort(struct alias_link *_lnk);
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| 303 | struct in_addr
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| 304 | GetProxyAddress(struct alias_link *_lnk);
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| 305 | void SetProxyAddress(struct alias_link *_lnk, struct in_addr _addr);
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| 306 | u_short GetProxyPort(struct alias_link *_lnk);
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| 307 | void SetProxyPort(struct alias_link *_lnk, u_short _port);
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| 308 | void SetAckModified(struct alias_link *_lnk);
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| 309 | int GetAckModified(struct alias_link *_lnk);
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| 310 | int GetDeltaAckIn(struct ip *_pip, struct alias_link *_lnk);
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| 311 | int GetDeltaSeqOut(struct ip *_pip, struct alias_link *_lnk);
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| 312 | void AddSeq (struct ip *_pip, struct alias_link *_lnk, int _delta);
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| 313 | void SetExpire (struct alias_link *_lnk, int _expire);
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| 314 | void ClearCheckNewLink(struct libalias *la);
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| 315 | void SetProtocolFlags(struct alias_link *_lnk, int _pflags);
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| 316 | int GetProtocolFlags(struct alias_link *_lnk);
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| 317 | void SetDestCallId(struct alias_link *_lnk, u_int16_t _cid);
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| 318 |
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| 319 | #ifndef NO_FW_PUNCH
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| 320 | void PunchFWHole(struct alias_link *_lnk);
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| 321 |
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| 322 | #endif
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| 323 |
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| 324 | /* Housekeeping function */
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| 325 | void HouseKeeping(struct libalias *);
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| 326 |
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| 327 | /* Tcp specfic routines */
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| 328 | /* lint -save -library Suppress flexelint warnings */
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| 329 |
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| 330 | /* Transparent proxy routines */
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| 331 | int
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| 332 | ProxyCheck(struct libalias *la, struct ip *_pip, struct in_addr *_proxy_server_addr,
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| 333 | u_short * _proxy_server_port);
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| 334 | void
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| 335 | ProxyModify(struct libalias *la, struct alias_link *_lnk, struct ip *_pip,
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| 336 | int _maxpacketsize, int _proxy_type);
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| 337 |
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| 338 | enum alias_tcp_state {
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| 339 | ALIAS_TCP_STATE_NOT_CONNECTED,
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| 340 | ALIAS_TCP_STATE_CONNECTED,
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| 341 | ALIAS_TCP_STATE_DISCONNECTED
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| 342 | };
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| 343 |
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| 344 | #if defined(_NETINET_IP_H_)
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| 345 | static __inline void *
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| 346 | ip_next(struct ip *iphdr)
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| 347 | {
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| 348 | char *p = (char *)iphdr;
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| 349 | return (&p[iphdr->ip_hl * 4]);
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| 350 | }
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| 351 | #endif
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| 352 |
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| 353 | #if defined(_NETINET_TCP_H_)
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| 354 | static __inline void *
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| 355 | tcp_next(struct tcphdr *tcphdr)
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| 356 | {
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| 357 | char *p = (char *)tcphdr;
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| 358 | return (&p[tcphdr->th_off * 4]);
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| 359 | }
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| 360 | #endif
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| 361 |
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| 362 | #if defined(_NETINET_UDP_H_)
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| 363 | static __inline void *
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| 364 | udp_next(struct udphdr *udphdr)
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| 365 | {
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| 366 | return ((void *)(udphdr + 1));
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| 367 | }
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| 368 | #endif
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| 369 |
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| 370 | #endif /* !_ALIAS_LOCAL_H_ */
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