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/*
* Ouroboros - Copyright (C) 2016 - 2017
*
* 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 version 2 as
* published by the Free Software Foundation.
*
* 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 "shm-pci"
#include <ouroboros/config.h>
#include <ouroboros/logs.h>
#include <ouroboros/errno.h>
#include <ouroboros/crc32.h>
#include <ouroboros/rib.h>
#include "shm_pci.h"
#include "dt_const.h"
#include <stdlib.h>
#include <string.h>
#define PDU_TYPE_SIZE 1
#define QOS_ID_SIZE 1
#define DEFAULT_TTL 60
#define TTL_SIZE 1
#define CHK_SIZE 4
#define BOOT_PATH "/" BOOT_NAME
struct {
struct dt_const dtc;
size_t head_size;
size_t tail_size;
} pci_info;
static void ser_pci_head(uint8_t * head,
struct pci * pci)
{
int offset = 0;
uint8_t ttl = DEFAULT_TTL;
memcpy(head, &pci->pdu_type, PDU_TYPE_SIZE);
offset += PDU_TYPE_SIZE;
memcpy(head + offset, &pci->dst_addr, pci_info.dtc.addr_size);
offset += pci_info.dtc.addr_size;
memcpy(head + offset, &pci->src_addr, pci_info.dtc.addr_size);
offset += pci_info.dtc.addr_size;
memcpy(head + offset, &pci->dst_cep_id, pci_info.dtc.cep_id_size);
offset += pci_info.dtc.cep_id_size;
memcpy(head + offset, &pci->src_cep_id, pci_info.dtc.cep_id_size);
offset += pci_info.dtc.cep_id_size;
memcpy(head + offset, &pci->pdu_length, pci_info.dtc.pdu_length_size);
offset += pci_info.dtc.pdu_length_size;
memcpy(head + offset, &pci->seqno, pci_info.dtc.seqno_size);
offset += pci_info.dtc.seqno_size;
memcpy(head + offset, &pci->qos_id, QOS_ID_SIZE);
offset += QOS_ID_SIZE;
if (pci_info.dtc.has_ttl)
memcpy(head + offset, &ttl, TTL_SIZE);
}
int shm_pci_init(void)
{
/* read dt constants from the RIB */
if (rib_read(BOOT_PATH "/dt/const/addr_size",
&pci_info.dtc.addr_size,
sizeof(pci_info.dtc.addr_size)) ||
rib_read(BOOT_PATH "/dt/const/cep_id_size",
&pci_info.dtc.cep_id_size,
sizeof(pci_info.dtc.cep_id_size)) ||
rib_read(BOOT_PATH "/dt/const/seqno_size",
&pci_info.dtc.seqno_size,
sizeof(pci_info.dtc.seqno_size)) ||
rib_read(BOOT_PATH "/dt/const/has_ttl",
&pci_info.dtc.has_ttl,
sizeof(pci_info.dtc.has_ttl)) ||
rib_read(BOOT_PATH "/dt/const/has_chk",
&pci_info.dtc.has_chk,
sizeof(pci_info.dtc.has_chk)) ||
rib_read(BOOT_PATH "/dt/const/min_pdu_size",
&pci_info.dtc.min_pdu_size,
sizeof(pci_info.dtc.min_pdu_size)) ||
rib_read(BOOT_PATH "/dt/const/max_pdu_size",
&pci_info.dtc.max_pdu_size,
sizeof(pci_info.dtc.max_pdu_size)))
return -1;
pci_info.head_size = PDU_TYPE_SIZE + pci_info.dtc.addr_size * 2 +
pci_info.dtc.cep_id_size * 2 + pci_info.dtc.pdu_length_size +
pci_info.dtc.seqno_size + QOS_ID_SIZE;
if (pci_info.dtc.has_ttl)
pci_info.head_size += TTL_SIZE;
pci_info.tail_size = pci_info.dtc.has_chk ? CHK_SIZE : 0;
return 0;
}
void shm_pci_fini(void) {
return ;
}
int shm_pci_ser(struct shm_du_buff * sdb,
struct pci * pci)
{
uint8_t * head;
uint8_t * tail;
head = shm_du_buff_head_alloc(sdb, pci_info.head_size);
if (head == NULL)
return -1;
ser_pci_head(head, pci);
if (pci_info.dtc.has_chk) {
tail = shm_du_buff_tail_alloc(sdb, pci_info.tail_size);
if (tail == NULL) {
shm_du_buff_head_release(sdb, pci_info.head_size);
return -1;
}
crc32((uint32_t *) tail, head, tail - head);
}
return 0;
}
buffer_t * shm_pci_ser_buf(buffer_t * buf,
struct pci * pci)
{
buffer_t * buffer;
if (buf == NULL || pci == NULL)
return NULL;
buffer = malloc(sizeof(*buffer));
if (buffer == NULL)
return NULL;
buffer->len = buf->len + pci_info.head_size +
pci_info.tail_size;
buffer->data = malloc(buffer->len);
if (buffer->data == NULL) {
free(buffer);
return NULL;
}
ser_pci_head(buffer->data, pci);
memcpy(buffer->data + pci_info.head_size,
buf->data, buf->len);
free(buf->data);
if (pci_info.dtc.has_chk)
crc32((uint32_t *) (buffer->data +
pci_info.head_size + buf->len),
buffer->data,
pci_info.head_size + buf->len);
return buffer;
}
struct pci * shm_pci_des(struct shm_du_buff * sdb)
{
uint8_t * head;
struct pci * pci;
int offset = 0;
if (sdb == NULL)
return NULL;
head = shm_du_buff_head(sdb);
pci = malloc(sizeof(*pci));
if (pci == NULL)
return NULL;
memcpy(&pci->pdu_type, head, PDU_TYPE_SIZE);
offset += PDU_TYPE_SIZE;
memcpy(&pci->dst_addr, head + offset, pci_info.dtc.addr_size);
offset += pci_info.dtc.addr_size;
memcpy(&pci->src_addr, head + offset, pci_info.dtc.addr_size);
offset += pci_info.dtc.addr_size;
memcpy(&pci->dst_cep_id, head + offset, pci_info.dtc.cep_id_size);
offset += pci_info.dtc.cep_id_size;
memcpy(&pci->src_cep_id, head + offset, pci_info.dtc.cep_id_size);
offset += pci_info.dtc.cep_id_size;
memcpy(&pci->pdu_length, head + offset, pci_info.dtc.pdu_length_size);
offset += pci_info.dtc.pdu_length_size;
memcpy(&pci->seqno, head + offset, pci_info.dtc.seqno_size);
offset += pci_info.dtc.seqno_size;
memcpy(&pci->qos_id, head + offset, QOS_ID_SIZE);
offset += QOS_ID_SIZE;
pci->has_ttl = pci_info.dtc.has_ttl;
if (pci_info.dtc.has_ttl)
memcpy(&pci->ttl, head + offset, TTL_SIZE);
return pci;
}
int shm_pci_shrink(struct shm_du_buff * sdb)
{
if (sdb == NULL)
return -1;
if (shm_du_buff_head_release(sdb, pci_info.head_size)) {
LOG_ERR("Failed to shrink head.");
return -1;
}
if (shm_du_buff_tail_release(sdb, pci_info.tail_size)) {
LOG_ERR("Failed to shrink tail.");
return -1;
}
return 0;
}
int shm_pci_dec_ttl(struct shm_du_buff * sdb)
{
uint8_t * head;
uint8_t * tail;
if (pci_info.dtc.has_ttl == false)
return 0;
head = shm_du_buff_head(sdb);
if (head == NULL)
return -1;
head[pci_info.head_size - TTL_SIZE]--;
if (pci_info.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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