1 | /*-
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2 | * Copyright (c) 2005 Paolo Pisati <piso@FreeBSD.org>
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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_mod.h,v 1.1.8.1 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_mod.h defines the outside world interfaces for the packet aliasing
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31 | * modular framework
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32 | */
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33 |
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34 | #ifndef _ALIAS_MOD_H_
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35 | #define _ALIAS_MOD_H_
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36 |
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37 | #if defined(_KERNEL) && !defined(VBOX)
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38 | MALLOC_DECLARE(M_ALIAS);
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39 |
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40 | /* Use kernel allocator. */
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41 | #if defined(_SYS_MALLOC_H_)
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42 | #define malloc(x) malloc(x, M_ALIAS, M_NOWAIT|M_ZERO)
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43 | #define calloc(x, n) malloc(x*n)
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44 | #define free(x) free(x, M_ALIAS)
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45 | #endif
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46 | #else /* VBOX */
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47 | # ifdef RT_OS_WINDOWS
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48 | # undef IN
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49 | # undef OUT
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50 | # endif /* RT_OS_WINDOWS */
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51 | #endif /* VBOX */
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52 |
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53 | /* Protocol handlers struct & function. */
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54 |
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55 | /* Packet flow direction. */
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56 | #define IN 1
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57 | #define OUT 2
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58 |
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59 | /* Working protocol. */
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60 | #define IP 1
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61 | #define TCP 2
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62 | #define UDP 4
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63 |
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64 | /*
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65 | * Data passed to protocol handler module, it must be filled
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66 | * right before calling find_handler() to determine which
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67 | * module is elegible to be called.
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68 | */
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69 |
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70 | struct alias_data {
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71 | struct alias_link *lnk;
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72 | struct in_addr *oaddr; /* Original address. */
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73 | struct in_addr *aaddr; /* Alias address. */
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74 | uint16_t *aport; /* Alias port. */
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75 | uint16_t *sport, *dport; /* Source & destination port */
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76 | uint16_t maxpktsize; /* Max packet size. */
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77 | };
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78 |
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79 | /*
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80 | * This structure contains all the information necessary to make
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81 | * a protocol handler correctly work.
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82 | */
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83 |
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84 | struct proto_handler {
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85 | u_int pri; /* Handler priority. */
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86 | int16_t dir; /* Flow direction. */
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87 | uint8_t proto; /* Working protocol. */
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88 | int (*fingerprint)(struct libalias *la, /* Fingerprint * function. */
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89 | struct ip *pip, struct alias_data *ah);
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90 | int (*protohandler)(struct libalias *la, /* Aliasing * function. */
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91 | struct ip *pip, struct alias_data *ah);
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92 | LIST_ENTRY(proto_handler) entries;
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93 | };
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94 |
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95 |
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96 | /*
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97 | * Used only in userland when libalias needs to keep track of all
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98 | * module loaded. In kernel land (kld mode) we don't need to care
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99 | * care about libalias modules cause it's kld to do it for us.
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100 | */
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101 |
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102 | #define DLL_LEN 32
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103 | struct dll {
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104 | char name[DLL_LEN]; /* Name of module. */
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105 | void *handle; /*
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106 | * Ptr to shared obj obtained through
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107 | * dlopen() - use this ptr to get access
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108 | * to any symbols from a loaded module
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109 | * via dlsym().
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110 | */
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111 | SLIST_ENTRY(dll) next;
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112 | };
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113 |
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114 | /* Functions used with protocol handlers. */
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115 |
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116 | void handler_chain_init(void);
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117 | void handler_chain_destroy(void);
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118 | #ifdef VBOX
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119 | int LibAliasAttachHandlers(PNATState pData, struct proto_handler *);
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120 | int LibAliasDetachHandlers(PNATState pData, struct proto_handler *);
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121 | int detach_handler(PNATState pData, struct proto_handler *);
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122 | struct proto_handler *first_handler(PNATState pData);
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123 | #else
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124 | int LibAliasAttachHandlers(struct proto_handler *);
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125 | int LibAliasDetachHandlers(struct proto_handler *);
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126 | int detach_handler(struct proto_handler *);
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127 | struct proto_handler *first_handler(void);
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128 | #endif
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129 | int find_handler(int8_t, int8_t, struct libalias *,
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130 | struct ip *, struct alias_data *);
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131 |
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132 | /* Functions used with dll module. */
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133 |
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134 | void dll_chain_init(void);
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135 | void dll_chain_destroy(void);
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136 | int attach_dll(struct dll *);
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137 | void *detach_dll(char *);
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138 | struct dll *walk_dll_chain(void);
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139 |
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140 | /* End of handlers. */
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141 | #define EOH -1
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142 |
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143 | /*
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144 | * Some defines borrowed from sys/module.h used to compile a kld
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145 | * in userland as a shared lib.
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146 | */
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147 |
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148 | #ifndef _KERNEL
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149 | typedef enum modeventtype {
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150 | MOD_LOAD,
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151 | MOD_UNLOAD,
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152 | MOD_SHUTDOWN,
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153 | MOD_QUIESCE
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154 | } modeventtype_t;
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155 |
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156 | typedef struct module *module_t;
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157 | typedef int (*modeventhand_t)(module_t, int /* modeventtype_t */, void *);
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158 |
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159 | /*
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160 | * Struct for registering modules statically via SYSINIT.
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161 | */
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162 | typedef struct moduledata {
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163 | const char *name; /* module name */
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164 | modeventhand_t evhand; /* event handler */
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165 | void *priv; /* extra data */
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166 | } moduledata_t;
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167 | #endif
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168 |
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169 | #endif /* !_ALIAS_MOD_H_ */
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