198 lines
4.2 KiB
C
198 lines
4.2 KiB
C
/*
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* Copyright (C) 2012 Reto Buerki
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* Copyright (C) 2012 Adrian-Ken Rueegsegger
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* HSR Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "tkm_id_manager.h"
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#include <utils/debug.h>
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#include <threading/rwlock.h>
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ENUM_BEGIN(tkm_context_kind_names, TKM_CTX_NONCE, TKM_CTX_ESA,
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"NONCE_CONTEXT",
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"DH_CONTEXT",
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"CC_CONTEXT",
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"ISA_CONTEXT",
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"AE_CONTEXT",
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"ESA_CONTEXT");
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ENUM_END(tkm_context_kind_names, TKM_CTX_ESA);
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typedef struct private_tkm_id_manager_t private_tkm_id_manager_t;
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/**
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* private data of tkm_id_manager
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*/
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struct private_tkm_id_manager_t {
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/**
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* public functions
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*/
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tkm_id_manager_t public;
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/**
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* Per-kind array of free context ids
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*/
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int* ctxids[TKM_CTX_MAX];
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/**
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* Per-kind context limits.
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*/
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tkm_limits_t limits;
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/**
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* rwlocks for context id lists
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*/
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rwlock_t *locks[TKM_CTX_MAX];
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};
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/**
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* Check if given kind is a valid context kind value.
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*
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* @param kind context kind to check
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* @return TRUE if given kind is a valid context kind,
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* FALSE otherwise
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*/
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static bool is_valid_kind(const tkm_context_kind_t kind)
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{
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return (int)kind >= 0 && kind < TKM_CTX_MAX;
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};
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METHOD(tkm_id_manager_t, acquire_id, int,
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private_tkm_id_manager_t * const this, const tkm_context_kind_t kind)
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{
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int id = 0;
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uint64_t j;
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if (!is_valid_kind(kind))
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{
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DBG1(DBG_LIB, "tried to acquire id for invalid context kind '%d'",
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kind);
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return 0;
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}
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this->locks[kind]->write_lock(this->locks[kind]);
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for (j = 0; j < this->limits[kind]; j++)
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{
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if (this->ctxids[kind][j] == 0)
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{
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this->ctxids[kind][j] = 1;
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id = j + 1;
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break;
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}
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}
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this->locks[kind]->unlock(this->locks[kind]);
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if (!id)
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{
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DBG1(DBG_LIB, "acquiring %N context id failed", tkm_context_kind_names,
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kind);
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}
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return id;
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}
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METHOD(tkm_id_manager_t, acquire_ref, bool,
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private_tkm_id_manager_t * const this, const tkm_context_kind_t kind,
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const int ref_id)
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{
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const int idx = ref_id - 1;
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if (!is_valid_kind(kind))
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{
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DBG1(DBG_LIB, "tried to acquire reference for invalid context kind '%d'",
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kind);
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return FALSE;
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}
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if (ref_id < 1 || (uint64_t)ref_id > this->limits[kind])
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{
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DBG1(DBG_LIB, "tried to acquire reference for context id %d out of "
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"bounds (max %llu)", ref_id, this->limits[kind]);
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return FALSE;
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}
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this->locks[kind]->write_lock(this->locks[kind]);
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this->ctxids[kind][idx]++;
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this->locks[kind]->unlock(this->locks[kind]);
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return TRUE;
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}
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METHOD(tkm_id_manager_t, release_id, int,
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private_tkm_id_manager_t * const this, const tkm_context_kind_t kind,
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const int id)
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{
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const int idx = id - 1;
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int refcount = 0;
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if (!is_valid_kind(kind))
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{
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DBG1(DBG_LIB, "tried to release id %d for invalid context kind '%d'",
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id, kind);
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return -1;
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}
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this->locks[kind]->write_lock(this->locks[kind]);
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if (this->ctxids[kind][idx] > 0)
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{
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refcount = --this->ctxids[kind][idx];
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}
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this->locks[kind]->unlock(this->locks[kind]);
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return refcount;
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}
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METHOD(tkm_id_manager_t, destroy, void,
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private_tkm_id_manager_t *this)
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{
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int i;
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for (i = 0; i < TKM_CTX_MAX; i++)
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{
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free(this->ctxids[i]);
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this->locks[i]->destroy(this->locks[i]);
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}
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free(this);
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}
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/*
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* see header file
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*/
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tkm_id_manager_t *tkm_id_manager_create(const tkm_limits_t limits)
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{
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private_tkm_id_manager_t *this;
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int i;
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INIT(this,
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.public = {
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.acquire_id = _acquire_id,
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.acquire_ref = _acquire_ref,
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.release_id = _release_id,
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.destroy = _destroy,
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},
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);
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for (i = 0; i < TKM_CTX_MAX; i++)
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{
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this->limits[i] = limits[i];
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this->ctxids[i] = calloc(limits[i], sizeof(int));
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this->locks[i] = rwlock_create(RWLOCK_TYPE_DEFAULT);
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DBG2(DBG_LIB, "%N initialized, %llu slot(s)", tkm_context_kind_names, i,
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limits[i]);
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}
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return &this->public;
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}
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