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/*
* Ouroboros - Copyright (C) 2016
*
* Protocol Control Information
*
* 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.
*/
#include "pci.h"
#include <stdlib.h>
#include <errno.h>
#define OUROBOROS_PREFIX "ipcp/pci"
#include <ouroboros/logs.h>
#define PCI_HEAD_SIZE(a, b) a.addr_size * 2 + \
a.cep_id_size * 2 + \
a.pdu_length_size + \
b.ttl_size + \
a.seqno_size + \
a.qos_id_size
#define PCI_TAIL_SIZE(b) b.chk_size
struct pci {
/* head */
uint8_t * dst_addr;
uint8_t * src_addr;
uint8_t * dst_cep_id;
uint8_t * src_cep_id;
uint8_t * pdu_length;
uint8_t * ttl;
uint8_t * seqno;
uint8_t * qos_id;
uint8_t * chk;
du_buff_t * dub;
struct ipcp_dtp_const dtpc;
struct ipcp_dup_const dupc;
};
pci_t * pci_create(du_buff_t * dub,
const struct ipcp_dtp_const * dtpc,
const struct ipcp_dup_const * dupc)
{
struct pci * p;
if (dub == NULL) {
LOG_DBGF("Bogus input. Bugging out.");
return NULL;
}
p = malloc(sizeof *p);
if (p == NULL)
return NULL;
p->dub = dub;
p->dtpc = *dtpc;
p->dupc = *dupc;
p->dst_addr = NULL;
p->src_addr = NULL;
p->dst_cep_id = NULL;
p->src_cep_id = NULL;
p->pdu_length = NULL;
p->ttl = NULL;
p->seqno = NULL;
p->qos_id = NULL;
p->chk = NULL;
return p;
}
void pci_destroy(pci_t * pci)
{
free(pci);
}
int pci_init(pci_t * pci)
{
if (pci == NULL) {
LOG_DBGF("Bogus input. Bugging out.");
return -EINVAL;
}
uint8_t * pci_head = du_buff_head_alloc(pci->dub, PCI_HEAD_SIZE(
pci->dtpc,pci->dupc));
uint8_t * pci_tail = du_buff_tail_alloc(pci->dub, PCI_TAIL_SIZE(
pci->dupc));
if (pci_head == NULL) {
LOG_DBG("Failed to allocate space for PCI at head.");
return -ENOBUFS;
}
if (pci_tail == NULL) {
LOG_DBG("Failed to allocate space for PCI at tail.");
return -ENOBUFS;
}
pci->dst_addr = pci_head;
pci->src_addr = (pci_head += pci->dtpc.addr_size);
pci->dst_cep_id = (pci_head += pci->dtpc.addr_size);
pci->src_cep_id = (pci_head += pci->dtpc.cep_id_size);
pci->pdu_length = (pci_head += pci->dtpc.cep_id_size);
pci->ttl = (pci_head += pci->dtpc.pdu_length_size);
pci->seqno = (pci_head += pci->dupc.ttl_size);
pci->qos_id = (pci_head += pci->dtpc.seqno_size);
pci->chk = (pci_tail);
return 0;
}
void pci_release(pci_t * pci)
{
if (pci == NULL)
return;
if (pci->dub == NULL)
return;
du_buff_head_release(pci->dub, PCI_HEAD_SIZE(pci->dtpc, pci->dupc));
du_buff_tail_release(pci->dub, PCI_TAIL_SIZE(pci->dupc));
}
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