254 lines
5.6 KiB
C++
254 lines
5.6 KiB
C++
/* Copied from tbf.cpp
|
|
*
|
|
* Copyright (C) 2012 Ivan Klyuchnikov
|
|
* Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu>
|
|
* Copyright (C) 2013 by Holger Hans Peter Freyther
|
|
*
|
|
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
#include <tbf.h>
|
|
#include <bts.h>
|
|
|
|
#include <stdio.h>
|
|
|
|
extern "C" {
|
|
#include <osmocom/core/msgb.h>
|
|
}
|
|
|
|
/* reset LLC frame */
|
|
void gprs_llc::reset()
|
|
{
|
|
m_index = 0;
|
|
m_length = 0;
|
|
|
|
memset(frame, 0x42, sizeof(frame));
|
|
}
|
|
|
|
void gprs_llc::reset_frame_space()
|
|
{
|
|
m_index = 0;
|
|
}
|
|
|
|
/* Put an Unconfirmed Information (UI) Dummy command, see GSM 44.064, 6.4.2.2 */
|
|
void gprs_llc::put_dummy_frame(size_t req_len)
|
|
{
|
|
/* The shortest dummy command (the spec requests at least 6 octets) */
|
|
static const uint8_t llc_dummy_command[] = {
|
|
0x43, 0xc0, 0x01, 0x2b, 0x2b, 0x2b
|
|
};
|
|
static const size_t max_dummy_command_len = 79;
|
|
|
|
put_frame(llc_dummy_command, sizeof(llc_dummy_command));
|
|
|
|
if (req_len > max_dummy_command_len)
|
|
req_len = max_dummy_command_len;
|
|
|
|
/* Add further stuffing, if the requested length exceeds the minimum
|
|
* dummy command length */
|
|
while (m_length < req_len)
|
|
frame[m_length++] = 0x2b;
|
|
}
|
|
|
|
void gprs_llc::put_frame(const uint8_t *data, size_t len)
|
|
{
|
|
/* only put frames when we are empty */
|
|
OSMO_ASSERT(m_index == 0 && m_length == 0);
|
|
append_frame(data, len);
|
|
}
|
|
|
|
void gprs_llc::append_frame(const uint8_t *data, size_t len)
|
|
{
|
|
/* TODO: bounds check */
|
|
memcpy(frame + m_length, data, len);
|
|
m_length += len;
|
|
}
|
|
|
|
void gprs_llc::init()
|
|
{
|
|
reset();
|
|
}
|
|
|
|
bool gprs_llc::is_user_data_frame(uint8_t *data, size_t len)
|
|
{
|
|
if (len < 2)
|
|
return false;
|
|
|
|
if ((data[0] & 0x0f) == 1 /* GPRS_SAPI_GMM */)
|
|
return false;
|
|
|
|
if ((data[0] & 0xe0) != 0xc0 /* LLC UI */)
|
|
/* It is not an LLC UI frame, see TS 44.064, 6.3 */
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
void gprs_llc_queue::init()
|
|
{
|
|
INIT_LLIST_HEAD(&m_queue);
|
|
m_queue_size = 0;
|
|
m_queue_octets = 0;
|
|
m_avg_queue_delay = 0;
|
|
}
|
|
|
|
void gprs_llc_queue::enqueue(struct msgb *llc_msg, const MetaInfo *info)
|
|
{
|
|
static const MetaInfo def_meta = {{0}};
|
|
MetaInfo *meta_storage;
|
|
|
|
osmo_static_assert(sizeof(*info) <= sizeof(llc_msg->cb), info_does_not_fit);
|
|
|
|
m_queue_size += 1;
|
|
m_queue_octets += msgb_length(llc_msg);
|
|
|
|
meta_storage = (MetaInfo *)&llc_msg->cb[0];
|
|
*meta_storage = info ? *info : def_meta;
|
|
|
|
msgb_enqueue(&m_queue, llc_msg);
|
|
}
|
|
|
|
void gprs_llc_queue::clear(BTS *bts)
|
|
{
|
|
struct msgb *msg;
|
|
|
|
while ((msg = msgb_dequeue(&m_queue))) {
|
|
if (bts)
|
|
bts->llc_dropped_frame();
|
|
msgb_free(msg);
|
|
}
|
|
|
|
m_queue_size = 0;
|
|
m_queue_octets = 0;
|
|
}
|
|
|
|
void gprs_llc_queue::move_and_merge(gprs_llc_queue *o)
|
|
{
|
|
struct msgb *msg, *msg1 = NULL, *msg2 = NULL;
|
|
struct llist_head new_queue;
|
|
size_t queue_size = 0;
|
|
size_t queue_octets = 0;
|
|
INIT_LLIST_HEAD(&new_queue);
|
|
|
|
while (1) {
|
|
if (msg1 == NULL)
|
|
msg1 = msgb_dequeue(&m_queue);
|
|
|
|
if (msg2 == NULL)
|
|
msg2 = msgb_dequeue(&o->m_queue);
|
|
|
|
if (msg1 == NULL && msg2 == NULL)
|
|
break;
|
|
|
|
if (msg1 == NULL) {
|
|
msg = msg2;
|
|
msg2 = NULL;
|
|
} else if (msg2 == NULL) {
|
|
msg = msg1;
|
|
msg1 = NULL;
|
|
} else {
|
|
const MetaInfo *mi1 = (MetaInfo *)&msg1->cb[0];
|
|
const MetaInfo *mi2 = (MetaInfo *)&msg2->cb[0];
|
|
|
|
if (timercmp(&mi2->recv_time, &mi1->recv_time, >)) {
|
|
msg = msg1;
|
|
msg1 = NULL;
|
|
} else {
|
|
msg = msg2;
|
|
msg2 = NULL;
|
|
}
|
|
}
|
|
|
|
msgb_enqueue(&new_queue, msg);
|
|
queue_size += 1;
|
|
queue_octets += msgb_length(msg);
|
|
}
|
|
|
|
OSMO_ASSERT(llist_empty(&m_queue));
|
|
OSMO_ASSERT(llist_empty(&o->m_queue));
|
|
|
|
o->m_queue_size = 0;
|
|
o->m_queue_octets = 0;
|
|
|
|
llist_splice_init(&new_queue, &m_queue);
|
|
m_queue_size = queue_size;
|
|
m_queue_octets = queue_octets;
|
|
}
|
|
|
|
#define ALPHA 0.5f
|
|
|
|
struct msgb *gprs_llc_queue::dequeue(const MetaInfo **info)
|
|
{
|
|
struct msgb *msg;
|
|
struct timeval *tv, tv_now, tv_result;
|
|
uint32_t lifetime;
|
|
const MetaInfo *meta_storage;
|
|
|
|
msg = msgb_dequeue(&m_queue);
|
|
if (!msg)
|
|
return NULL;
|
|
|
|
meta_storage = (MetaInfo *)&msg->cb[0];
|
|
|
|
if (info)
|
|
*info = meta_storage;
|
|
|
|
m_queue_size -= 1;
|
|
m_queue_octets -= msgb_length(msg);
|
|
|
|
/* take the second time */
|
|
gettimeofday(&tv_now, NULL);
|
|
tv = (struct timeval *)&msg->data[sizeof(*tv)];
|
|
timersub(&tv_now, &meta_storage->recv_time, &tv_result);
|
|
|
|
lifetime = tv_result.tv_sec*1000 + tv_result.tv_usec/1000;
|
|
m_avg_queue_delay = m_avg_queue_delay * ALPHA + lifetime * (1-ALPHA);
|
|
|
|
return msg;
|
|
}
|
|
|
|
void gprs_llc_queue::calc_pdu_lifetime(BTS *bts, const uint16_t pdu_delay_csec, struct timeval *tv)
|
|
{
|
|
uint16_t delay_csec;
|
|
if (bts->bts_data()->force_llc_lifetime)
|
|
delay_csec = bts->bts_data()->force_llc_lifetime;
|
|
else
|
|
delay_csec = pdu_delay_csec;
|
|
|
|
/* keep timestamp at 0 for infinite delay */
|
|
if (delay_csec == 0xffff) {
|
|
memset(tv, 0, sizeof(*tv));
|
|
return;
|
|
}
|
|
|
|
/* calculate timestamp of timeout */
|
|
struct timeval now, csec;
|
|
gettimeofday(&now, NULL);
|
|
csec.tv_usec = (delay_csec % 100) * 10000;
|
|
csec.tv_sec = delay_csec / 100;
|
|
|
|
timeradd(&now, &csec, tv);
|
|
}
|
|
|
|
bool gprs_llc_queue::is_frame_expired(const struct timeval *tv_now,
|
|
const struct timeval *tv)
|
|
{
|
|
/* Timeout is infinite */
|
|
if (tv->tv_sec == 0 && tv->tv_usec == 0)
|
|
return false;
|
|
|
|
return timercmp(tv_now, tv, >);
|
|
}
|