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/*
* (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org>
* (C) 2010 by On-Waves
* All Rights Reserved
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <isup_types.h>
#include <cellmgr_debug.h>
#include <mtp_data.h>
#include <osmocore/msgb.h>
#include <osmocore/tlv.h>
static struct msgb *isup_gra_alloc(int cic, int range)
{
struct isup_msg_hdr *hdr;
struct msgb *msg;
int bits, len;
msg = msgb_alloc_headroom(4096, 128, "ISUP GRA");
if (!msg) {
LOGP(DISUP, LOGL_ERROR, "Allocation of GRA message failed.\n");
return NULL;
}
msg->l2h = msgb_put(msg, sizeof(*hdr));
/* write the ISUP header */
hdr = (struct isup_msg_hdr *) msg->l2h;
hdr->cic = cic;
hdr->msg_type = ISUP_MSG_GRA;
/*
* place the pointers here.
* 1.) place the variable start after us
* 2.) place the length
*/
msgb_v_put(msg, 1);
bits = range + 1;
len = (bits / 8) + 1;
msgb_v_put(msg, len + 1);
msgb_v_put(msg, range);
msgb_put(msg, len);
return msg;
}
/* this message contains the range */
int isup_parse_grs(const uint8_t *data, uint8_t in_length)
{
uint8_t ptr;
uint8_t length;
if (in_length > 3) {
LOGP(DISUP, LOGL_ERROR, "This needs three bytes.\n");
return -1;
}
ptr = data[0];
if (1 + ptr > in_length) {
LOGP(DISUP, LOGL_ERROR, "Pointing outside the packet.\n");
return -1;
}
length = data[0 + ptr];
if (1 + ptr + 1 > in_length) {
LOGP(DISUP, LOGL_ERROR, "No space for the data.\n");
return -1;
}
return data[0 + ptr + 1];
}
/* Handle incoming ISUP data */
static int handle_circuit_reset_grs(struct mtp_link_set *link, int sls, int cic,
const uint8_t *data, int size)
{
struct msgb *resp;
int range;
range = isup_parse_grs(data, size);
if (range < 0)
return -1;
resp = isup_gra_alloc(cic, range);
if (!resp)
return -1;
mtp_link_set_submit_isup_data(link, sls, resp->l2h, msgb_l2len(resp));
msgb_free(resp);
return 0;
}
int mtp_link_set_forward_isup(struct mtp_link_set *link, struct msgb *msg, int sls)
{
int rc = -1;
int payload_size;
struct isup_msg_hdr *hdr;
if (msgb_l3len(msg) < sizeof(*hdr)) {
LOGP(DISUP, LOGL_ERROR, "ISUP header is too short.\n");
return -1;
}
hdr = (struct isup_msg_hdr *) msg->l3h;
payload_size = msgb_l3len(msg) - sizeof(*hdr);
switch (hdr->msg_type) {
case ISUP_MSG_GRS:
rc = handle_circuit_reset_grs(link, sls, hdr->cic, hdr->data, payload_size);
break;
default:
LOGP(DISUP, LOGL_NOTICE, "ISUP msg not handled: 0x%x\n", hdr->msg_type);
break;
}
return rc;
}
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