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/*
* Ouroboros - Copyright (C) 2016 - 2017
*
* Protocol Control Information of Data Transfer AE
*
* Dimitri Staessens <dimitri.staessens@ugent.be>
* Sander Vrijders <sander.vrijders@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.
*/
#include <ouroboros/config.h>
#include <ouroboros/errno.h>
#include <ouroboros/crc32.h>
#include <ouroboros/rib.h>
#include "dt_const.h"
#include "dt_pci.h"
#include "ribconfig.h"
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#define PDU_TYPE_SIZE 1
#define QC_SIZE 1
#define DEFAULT_TTL 60
#define TTL_SIZE 1
#define CHK_SIZE 4
struct {
struct dt_const dtc;
size_t head_size;
size_t tail_size;
/* offsets */
size_t qc_o;
size_t ttl_o;
size_t pdu_type_o;
} dt_pci_info;
int dt_pci_init(void)
{
/* read dt constants from the RIB */
if (rib_read(BOOT_PATH "/dt/const/addr_size",
&dt_pci_info.dtc.addr_size,
sizeof(dt_pci_info.dtc.addr_size)) < 0 ||
rib_read(BOOT_PATH "/dt/const/has_ttl",
&dt_pci_info.dtc.has_ttl,
sizeof(dt_pci_info.dtc.has_ttl)) < 0 ||
rib_read(BOOT_PATH "/dt/const/has_chk",
&dt_pci_info.dtc.has_chk,
sizeof(dt_pci_info.dtc.has_chk)) < 0)
return -1;
dt_pci_info.qc_o = dt_pci_info.dtc.addr_size;
dt_pci_info.ttl_o = dt_pci_info.qc_o + QC_SIZE;
dt_pci_info.head_size = dt_pci_info.ttl_o + PDU_TYPE_SIZE;
if (dt_pci_info.dtc.has_ttl)
dt_pci_info.head_size += TTL_SIZE;
dt_pci_info.tail_size = dt_pci_info.dtc.has_chk ? CHK_SIZE : 0;
return 0;
}
void dt_pci_fini(void) {
return;
}
int dt_pci_ser(struct shm_du_buff * sdb,
struct dt_pci * dt_pci)
{
uint8_t * head;
uint8_t * tail;
uint8_t ttl = DEFAULT_TTL;
assert(sdb);
assert(dt_pci);
head = shm_du_buff_head_alloc(sdb, dt_pci_info.head_size);
if (head == NULL)
return -EPERM;
/* FIXME: Add check and operations for Big Endian machines */
memcpy(head, &dt_pci->dst_addr, dt_pci_info.dtc.addr_size);
memcpy(head + dt_pci_info.qc_o, &dt_pci->qc, QC_SIZE);
if (dt_pci_info.dtc.has_ttl)
memcpy(head + dt_pci_info.ttl_o, &ttl, TTL_SIZE);
memcpy(head + dt_pci_info.pdu_type_o, &dt_pci->pdu_type, PDU_TYPE_SIZE);
if (dt_pci_info.dtc.has_chk) {
tail = shm_du_buff_tail_alloc(sdb, dt_pci_info.tail_size);
if (tail == NULL) {
shm_du_buff_head_release(sdb, dt_pci_info.head_size);
return -EPERM;
}
*((uint32_t *) tail) = 0;
crc32((uint32_t *) tail, head, tail - head);
}
return 0;
}
void dt_pci_des(struct shm_du_buff * sdb,
struct dt_pci * dt_pci)
{
uint8_t * head;
assert(sdb);
assert(dt_pci);
head = shm_du_buff_head(sdb);
/* FIXME: Add check and operations for Big Endian machines */
memcpy(&dt_pci->dst_addr, head, dt_pci_info.dtc.addr_size);
memcpy(&dt_pci->qc, head + dt_pci_info.qc_o, QC_SIZE);
if (dt_pci_info.dtc.has_ttl) {
--*(head + dt_pci_info.ttl_o); /* decrease TTL */
memcpy(&dt_pci->ttl, head + dt_pci_info.ttl_o, TTL_SIZE);
} else {
dt_pci->ttl = 1;
}
memcpy(&dt_pci->pdu_type, head + dt_pci_info.pdu_type_o, PDU_TYPE_SIZE);
}
void dt_pci_shrink(struct shm_du_buff * sdb)
{
assert(sdb);
shm_du_buff_head_release(sdb, dt_pci_info.head_size);
shm_du_buff_tail_release(sdb, dt_pci_info.tail_size);
}
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