| /********************************************************************************************************* |
| * Software License Agreement (BSD License) * |
| * Author: Sebastien Decugis <sdecugis@freediameter.net> and * |
| * Thomas Klausner <tk@giga.or.at> * |
| * * |
| * Copyright (c) 2013, 2014, WIDE Project and NICT * |
| * All rights reserved. * |
| * * |
| * Redistribution and use of this software in source and binary forms, with or without modification, are * |
| * permitted provided that the following conditions are met: * |
| * * |
| * * Redistributions of source code must retain the above * |
| * copyright notice, this list of conditions and the * |
| * following disclaimer. * |
| * * |
| * * 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. * |
| * * |
| * * Neither the name of the WIDE Project or NICT nor the * |
| * names of its contributors may be used to endorse or * |
| * promote products derived from this software without * |
| * specific prior written permission of WIDE Project and * |
| * NICT. * |
| * * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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. * |
| *********************************************************************************************************/ |
| |
| /* Diameter Redirect management */ |
| #include <freeDiameter/extension.h> |
| |
| #include "uthash.h" |
| |
| /* There are 2 locks in this module. The priority is established as follow to avoid deadlocks: |
| exp_peer mutex > usages rwlock. |
| (e.g., the rwlock can be taken while holding the mutex, but not the other way) |
| */ |
| |
| /* The types of redirects (from Redirect-Host-Usage AVP value) */ |
| enum redir_h_u { |
| DONT_CACHE = 0, |
| ALL_SESSION, |
| ALL_REALM, |
| REALM_AND_APPLICATION, |
| ALL_APPLICATION, |
| ALL_HOST, |
| ALL_USER |
| }; |
| #define H_U_MAX ALL_USER |
| |
| /* Eye catcher */ |
| #define REDIR_ENTRY_EYEC 0x43D14E74 |
| |
| /* Expiration time set for DONT_CACHE tasks, so that the entry is found when the code is called back */ |
| #define DEFAULT_EXPIRE_TIME 10 /* seconds */ |
| |
| /* Structure to store a parsed Redirect-Host */ |
| struct redir_host { |
| struct fd_list chain; |
| |
| DiamId_t id; /* malloc'd */ |
| size_t len; |
| /* We don't use the following yet because we don't support dynamic new connections |
| int secure; |
| uint16_t port; |
| int l4; |
| char proto; |
| */ |
| }; |
| |
| /* Rule data that is stored depending on Redirect-Host-Usage value */ |
| union matchdata { |
| /* DONT_CACHE */ |
| struct { |
| struct msg * msg; /* The query message for which this rule was created */ |
| } message; |
| |
| /* ALL_SESSION */ |
| struct { |
| os0_t s; /* sid */ |
| size_t l; |
| } session; |
| |
| /* ALL_REALM */ |
| struct { |
| os0_t s; /* Destination-Realm AVP data */ |
| size_t l; |
| } realm; |
| |
| /* REALM_AND_APPLICATION */ |
| struct { |
| application_id_t a; /* message's application */ |
| os0_t s; /* Destination-Realm AVP data */ |
| size_t l; |
| } realm_app; |
| |
| /* ALL_APPLICATION */ |
| struct { |
| application_id_t a; /* message's application */ |
| } app; |
| |
| /* ALL_HOST */ |
| struct { |
| os0_t s; /* the Origin-Host of the Redirect message (which may be the next hop or not) */ |
| size_t l; |
| } host; |
| |
| /* ALL_USER */ |
| struct { |
| os0_t s; /* User-Name AVP data */ |
| size_t l; |
| } user; |
| }; |
| |
| |
| /* Structure to store a Redirect indication */ |
| struct redir_entry { |
| uint32_t eyec; /* must be REDIR_ENTRY_EYEC, used for debug only */ |
| |
| struct { |
| os0_t s; /* alloc'd, must be freed */ |
| size_t l; |
| } from; /* whom this rule was received from (next hop) ? */ |
| |
| struct fd_list target_peers_list; /* The list of Redirect-Hosts for this entry */ |
| |
| struct timespec timeout; /* When does this entry expire? */ |
| struct fd_list exp_list; /* chain in the expire_list list, ordered by expiration date, protected by exp_peer_lock */ |
| |
| enum redir_h_u type; /* Type of this entry */ |
| struct fd_list redir_list; /* link in redirects_usages lists. Lists are ordered by the data value. Protected by rw locks */ |
| union matchdata data; /* The strings are duplicated & must be freed in this structure */ |
| UT_hash_handle hh; /* magic entry for hash table */ |
| }; |
| |
| /* The array where the redir_entries are stored */ |
| struct redir_line { |
| enum fd_rt_out_score score; |
| pthread_rwlock_t lock; /* protect the list */ |
| struct fd_list sentinel; /* list of redir_entry, the "o" field of the sentinel points to the redir_line entry */ |
| }; |
| extern struct redir_line redirects_usages[]; |
| /* the hash table where entries are stored for ALL_SESSION and ALL_USER */ |
| extern struct redir_entry *redirect_hash_table[]; |
| |
| /* Accelerator to the line lock */ |
| #define RWLOCK_REDIR( _entry ) ( &(redirects_usages[(_entry)->type].lock) ) |
| |
| /* Lock that must be owned before calling some functions */ |
| extern pthread_mutex_t redir_exp_peer_lock; |
| |
| /* Dictionary cached objects */ |
| extern struct dict_object * redir_dict_dr; |
| extern struct dict_object * redir_dict_un; |
| |
| /* Functions on redir_entry */ |
| int redir_entry_init(); |
| int redir_entry_fini(); |
| 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); |
| extern int (*redir_entry_cmp_key[])(union matchdata * , union matchdata *); /* compare functions */ |
| int redir_entry_insert(struct redir_entry * e); |
| int redir_entry_destroy(struct redir_entry * e); |
| |
| /* Functions for expiry */ |
| void * redir_exp_thr_fct(void * arg); |
| int redir_exp_set(struct redir_entry * e, uint32_t duration); |
| |
| /* Forward cb */ |
| int redir_fwd_cb(void * cbdata, struct msg ** msg); |
| |
| /* Out callback */ |
| int redir_out_cb(void * cbdata, struct msg ** pmsg, struct fd_list * candidates); |