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/*
pmacct (Promiscuous mode IP Accounting package)
pmacct is Copyright (C) 2003-2019 by Paolo Lucente
*/
/*
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* includes */
#include "pmacct.h"
#include "imt_plugin.h"
/* rules:
first pool descriptor id is 1 */
/* functions */
void init_memory_pool_table()
{
if (config.num_memory_pools) {
mpd = (unsigned char *) map_shared(0, (config.num_memory_pools+1)*sizeof(struct memory_pool_desc),
PROT_READ|PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS, -1, 0);
memset(mpd, 0, (config.num_memory_pools+1)*sizeof(struct memory_pool_desc));
}
else {
mpd = (unsigned char *) map_shared(0, (NUM_MEMORY_POOLS+1)*sizeof(struct memory_pool_desc),
PROT_READ|PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS, -1, 0);
memset(mpd, 0, (NUM_MEMORY_POOLS+1)*sizeof(struct memory_pool_desc));
}
current_pool = (struct memory_pool_desc *) mpd;
}
void clear_memory_pool_table()
{
struct memory_pool_desc *pool_ptr;
pool_ptr = (struct memory_pool_desc *) mpd;
while (pool_ptr->next) {
memset(pool_ptr->base_ptr, 0, pool_ptr->len);
pool_ptr->id = 0;
pool_ptr = pool_ptr->next;
}
/* clearing last memory pool and rewinding stuff */
memset(pool_ptr->base_ptr, 0, pool_ptr->len);
current_pool = (struct memory_pool_desc *) mpd;
}
struct memory_pool_desc *request_memory_pool(int size)
{
int new_id;
unsigned char *memptr;
struct memory_pool_desc *new_pool;
/* trying to find resource already allocated but
currently unused */
if (current_pool->next) {
if (!current_pool->id) {
new_pool = current_pool;
new_pool->id = 1;
}
else {
new_pool = current_pool->next;
new_pool->id = current_pool->id+1;
}
if (size <= new_pool->len) {
Log(LOG_DEBUG, "DEBUG ( %s/%s ): using an already allocated memory segment.\n", config.name, config.type);
memset(new_pool->base_ptr, 0, size);
new_pool->ptr = new_pool->base_ptr;
new_pool->space_left = size;
return new_pool;
}
}
/* we didn't find allocated resources; requesting new
news and registering them in memory pool descriptors
table */
new_id = current_pool->id+1;
Log(LOG_DEBUG, "DEBUG ( %s/%s ): allocating a new memory segment.\n", config.name, config.type);
if (config.num_memory_pools) {
if (new_id > config.num_memory_pools) return NULL;
new_pool = (struct memory_pool_desc *) mpd+(new_id-1);
}
else {
if (new_id > NUM_MEMORY_POOLS) {
/*
XXX: this malloc() is a quick workaround because of some mallopt() SEGV when
trying to allocate chuncks < 1024; i'm not figuring out where is the *real*
problem. First experienced with:
gcc version 3.3.3 (Debian 20040320) / glibc 2.3.2
*/
// new_pool = (struct memory_pool_desc *) malloc(sizeof(struct memory_pool_desc));
new_pool = (struct memory_pool_desc *) map_shared(0, 1024, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS, -1, 0);
if (new_pool == MAP_FAILED) return NULL;
memset(new_pool, 0, sizeof(struct memory_pool_desc));
}
else new_pool = (struct memory_pool_desc *) mpd+(new_id-1);
}
if (current_pool->id) current_pool->next = new_pool;
/* We found a free room in mpd table; now we have
allocate needed memory */
memptr = (unsigned char *) map_shared(0, size, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS, -1, 0);
if (memptr == MAP_FAILED) {
Log(LOG_WARNING, "WARN ( %s/%s ): memory sold out ! Please, clear in-memory stats !\n", config.name, config.type);
return NULL;
}
memset(memptr, 0, size);
new_pool->id = new_id;
new_pool->base_ptr = memptr;
new_pool->ptr = memptr;
new_pool->space_left = size;
new_pool->len = size;
return new_pool;
}
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