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/*
* Ouroboros - Copyright (C) 2016
*
* Protocol Control Information in Shared Memory Map
*
* Dimitri Staessens <dimitri.staessens@intec.ugent.be>
* Sander Vrijders <sander.vrijders@intec.ugent.be>
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#define OUROBOROS_PREFIX "ipcpd/shm_pci"
#include <ouroboros/logs.h>
#include <ouroboros/errno.h>
#include <stdlib.h>
#include <string.h>
#include "shm_pci.h"
#include "frct.h"
#include "crc32.h"
#define QOS_ID_SIZE 1
#define DEFAULT_TTL 60
#define TTL_SIZE 1
#define CHK_SIZE 4
static int shm_pci_head_size(struct dt_const * dtc)
{
int len = 0;
len = dtc->addr_size * 2 + dtc->cep_id_size * 2
+ dtc->pdu_length_size + dtc->seqno_size
+ QOS_ID_SIZE;
if (dtc->has_ttl)
len += TTL_SIZE;
return len;
}
static int shm_pci_tail_size(struct dt_const * dtc)
{
return dtc->has_chk ? CHK_SIZE : 0;
}
int shm_pci_ser(struct shm_du_buff * sdb,
struct pci * pci)
{
uint8_t * head;
uint8_t * tail;
int offset = 0;
struct dt_const * dtc;
uint8_t ttl = DEFAULT_TTL;
dtc = frct_dt_const();
if (dtc == NULL)
return -1;
head = shm_du_buff_head_alloc(sdb, shm_pci_head_size(dtc));
if (head == NULL)
return -1;
memcpy(head, &pci->dst_addr, dtc->addr_size);
offset += dtc->addr_size;
memcpy(head + offset, &pci->src_addr, dtc->addr_size);
offset += dtc->addr_size;
memcpy(head + offset, &pci->dst_cep_id, dtc->cep_id_size);
offset += dtc->cep_id_size;
memcpy(head + offset, &pci->src_cep_id, dtc->cep_id_size);
offset += dtc->cep_id_size;
memcpy(head + offset, &pci->pdu_length, dtc->pdu_length_size);
offset += dtc->pdu_length_size;
memcpy(head + offset, &pci->seqno, dtc->seqno_size);
offset += dtc->seqno_size;
memcpy(head + offset, &pci->qos_id, QOS_ID_SIZE);
offset += QOS_ID_SIZE;
if (dtc->has_ttl)
memcpy(head + offset, &ttl, TTL_SIZE);
if (dtc->has_chk) {
tail = shm_du_buff_tail_alloc(sdb, shm_pci_tail_size(dtc));
if (tail == NULL) {
shm_du_buff_head_release(sdb, shm_pci_tail_size(dtc));
return -1;
}
crc32((uint32_t *) tail, head, tail - head);
}
return 0;
}
struct pci * shm_pci_des(struct shm_du_buff * sdb)
{
uint8_t * head;
struct pci * pci;
int offset = 0;
struct dt_const * dtc;
head = shm_du_buff_head(sdb);
if (head == NULL)
return NULL;
dtc = frct_dt_const();
if (dtc == NULL)
return NULL;
pci = malloc(sizeof(*pci));
if (pci == NULL)
return NULL;
memcpy(&pci->dst_addr, head, dtc->addr_size);
offset += dtc->addr_size;
memcpy(&pci->src_addr, head + offset, dtc->addr_size);
offset += dtc->addr_size;
memcpy(&pci->dst_cep_id, head + offset, dtc->cep_id_size);
offset += dtc->cep_id_size;
memcpy(&pci->src_cep_id, head + offset, dtc->cep_id_size);
offset += dtc->cep_id_size;
memcpy(&pci->pdu_length, head + offset, dtc->pdu_length_size);
offset += dtc->pdu_length_size;
memcpy(&pci->seqno, head + offset, dtc->seqno_size);
offset += dtc->seqno_size;
memcpy(&pci->qos_id, head + offset, QOS_ID_SIZE);
offset += QOS_ID_SIZE;
if (dtc->has_ttl)
memcpy(&pci->ttl, head + offset, TTL_SIZE);
return pci;
}
int shm_pci_shrink(struct shm_du_buff * sdb)
{
struct dt_const * dtc;
if (sdb == NULL)
return -1;
dtc = frct_dt_const();
if (dtc == NULL)
return -1;
if (shm_du_buff_head_release(sdb, shm_pci_head_size(dtc))) {
LOG_ERR("Failed to shrink head.");
return -1;
}
if (shm_du_buff_tail_release(sdb, shm_pci_tail_size(dtc))) {
LOG_ERR("Failed to shrink tail.");
return -1;
}
return 0;
}
int shm_pci_dec_ttl(struct shm_du_buff * sdb)
{
struct dt_const * dtc;
int offset = 0;
uint8_t * head;
uint8_t * tail;
dtc = frct_dt_const();
if (dtc == NULL)
return -1;
if (dtc->has_ttl == false)
return 0;
offset = shm_pci_head_size(dtc) - 1;
head = shm_du_buff_head(sdb);
if (head == NULL)
return -1;
head[offset]--;
if (dtc->has_chk) {
tail = shm_du_buff_tail(sdb);
if (tail == NULL)
return -1;
tail -= CHK_SIZE;
crc32((uint32_t *) tail, head, tail - head);
}
return 0;
}
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