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annotate extensions/rt_redirect/rt_redir.h @ 1235:f937feb72734 1.2.0

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Updated copyright information
author Sebastien Decugis <sdecugis@freediameter.net>
date Sat, 14 Sep 2013 18:09:01 +0800
parents 581bbd48524a
children 82280e745a89
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1 /*********************************************************************************************************
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2 * Software License Agreement (BSD License) *
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3 * Author: Sebastien Decugis <sdecugis@freediameter.net> *
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4 * *
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5 * Copyright (c) 2013, WIDE Project and NICT *
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6 * All rights reserved. *
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7 * *
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8 * Redistribution and use of this software in source and binary forms, with or without modification, are *
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9 * permitted provided that the following conditions are met: *
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10 * *
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11 * * Redistributions of source code must retain the above *
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12 * copyright notice, this list of conditions and the *
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13 * following disclaimer. *
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14 * *
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15 * * Redistributions in binary form must reproduce the above *
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16 * copyright notice, this list of conditions and the *
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17 * following disclaimer in the documentation and/or other *
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18 * materials provided with the distribution. *
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19 * *
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20 * * Neither the name of the WIDE Project or NICT nor the *
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21 * names of its contributors may be used to endorse or *
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22 * promote products derived from this software without *
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23 * specific prior written permission of WIDE Project and *
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24 * NICT. *
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25 * *
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26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED *
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27 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A *
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28 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR *
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29 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT *
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30 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS *
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31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR *
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32 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF *
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33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
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34 *********************************************************************************************************/
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35
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36 /* Diameter Redirect management */
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37 #include <freeDiameter/extension.h>
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38
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39 /* There are 2 locks in this module. The priority is established as follow to avoid deadlocks:
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40 exp_peer mutex > usages rwlock.
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41 (e.g., the rwlock can be taken while holding the mutex, but not the other way)
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42 */
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43
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44 /* The types of redirects (from Redirect-Host-Usage AVP value) */
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45 enum redir_h_u {
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46 DONT_CACHE = 0,
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47 ALL_SESSION,
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48 ALL_REALM,
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49 REALM_AND_APPLICATION,
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50 ALL_APPLICATION,
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51 ALL_HOST,
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52 ALL_USER
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53 };
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54 #define H_U_MAX ALL_USER
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55
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56 /* Eye catcher */
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57 #define REDIR_ENTRY_EYEC 0x43D14E74
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58
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59 /* Expiration time set for DONT_CACHE tasks, so that the entry is found when the code is called back */
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60 #define DEFAULT_EXPIRE_TIME 10 /* seconds */
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61
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62 /* Structure to store a parsed Redirect-Host */
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63 struct redir_host {
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64 struct fd_list chain;
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65
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66 DiamId_t id; /* malloc'd */
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67 size_t len;
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68 /* We don't use the following yet because we don't support dynamic new connections
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69 int secure;
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70 uint16_t port;
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71 int l4;
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72 char proto;
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73 */
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74 };
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75
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76 /* Rule data that is stored depending on Redirect-Host-Usage value */
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77 union matchdata {
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78 /* DONT_CACHE */
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79 struct {
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80 struct msg * msg; /* The query message for which this rule was created */
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81 } message;
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82
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83 /* ALL_SESSION */
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84 struct {
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85 os0_t s; /* sid */
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86 size_t l;
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87 } session;
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88
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89 /* ALL_REALM */
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90 struct {
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91 os0_t s; /* Destination-Realm AVP data */
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92 size_t l;
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93 } realm;
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94
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95 /* REALM_AND_APPLICATION */
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96 struct {
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97 application_id_t a; /* message's application */
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98 os0_t s; /* Destination-Realm AVP data */
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99 size_t l;
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100 } realm_app;
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101
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102 /* ALL_APPLICATION */
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103 struct {
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104 application_id_t a; /* message's application */
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105 } app;
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106
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107 /* ALL_HOST */
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108 struct {
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109 os0_t s; /* the Origin-Host of the Redirect message (which may be the next hop or not) */
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110 size_t l;
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111 } host;
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112
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113 /* ALL_USER */
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114 struct {
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115 os0_t s; /* User-Name AVP data */
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116 size_t l;
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117 } user;
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118 };
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119
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120
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121 /* Structure to store a Redirect indication */
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122 struct redir_entry {
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123 uint32_t eyec; /* must be REDIR_ENTRY_EYEC, used for debug only */
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124
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125 struct {
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126 os0_t s; /* alloc'd, must be freed */
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127 size_t l;
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128 } from; /* whom this rule was received from (next hop) ? */
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129
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130 struct fd_list target_peers_list; /* The list of Redirect-Hosts for this entry */
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131
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132 struct timespec timeout; /* When does this entry expires? */
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133 struct fd_list exp_list; /* chain in the expire_list list, ordered by expiration date, protected by exp_peer_lock */
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134
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135 enum redir_h_u type; /* Type of this entry */
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136 struct fd_list redir_list; /* link in redirects_usages lists. Lists are ordered by the data value. Protected by rw locks */
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137 union matchdata data; /* The strings are duplicated & must be freed in this structure */
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138 };
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139
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140 /* The array where the redir_entries are stored */
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141 struct redir_line {
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142 enum fd_rt_out_score score;
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143 pthread_rwlock_t lock; /* protect the list */
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144 struct fd_list sentinel; /* list of redir_entry, the "o" field of the sentinel points to the redir_line entry */
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145 };
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146 extern struct redir_line redirects_usages[];
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147
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148 /* Accelerator to the line lock */
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149 #define RWLOCK_REDIR( _entry ) ( &(redirects_usages[(_entry)->type].lock) )
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150
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151 /* Lock that must be owned before calling some functions */
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152 extern pthread_mutex_t redir_exp_peer_lock;
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153
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154 /* Dictionary cached objects */
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155 extern struct dict_object * redir_dict_dr;
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156 extern struct dict_object * redir_dict_un;
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157
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158 /* Functions on redir_entry */
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159 int redir_entry_init();
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160 int redir_entry_new(struct redir_entry ** e, struct fd_list * targets, uint32_t rhu, struct msg * qry, DiamId_t nh, size_t nhlen, os0_t oh, size_t ohlen);
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161 extern int (*redir_entry_cmp_key[])(union matchdata * , union matchdata *); /* compare functions */
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162 int redir_entry_insert(struct redir_entry * e);
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163 int redir_entry_destroy(struct redir_entry * e);
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164
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165 /* Functions for expiry */
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166 void * redir_exp_thr_fct(void * arg);
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167 int redir_exp_set(struct redir_entry * e, uint32_t duration);
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168
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169 /* Forward cb */
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170 int redir_fwd_cb(void * cbdata, struct msg ** msg);
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171
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172 /* Out callback */
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173 int redir_out_cb(void * cbdata, struct msg ** pmsg, struct fd_list * candidates);
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