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/* MTP level3 link */
/*
* (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 <mtp_data.h>
#include <mtp_level3.h>
#include <cellmgr_debug.h>
#include <counter.h>
#include <osmocore/talloc.h>
#include <string.h>
static struct msgb *mtp_create_sltm(struct mtp_link *link)
{
const uint8_t test_ptrn[14] = { 'G', 'S', 'M', 'M', 'M', 'S', };
struct mtp_level_3_hdr *hdr;
struct mtp_level_3_mng *mng;
struct msgb *msg = mtp_msg_alloc(link->set);
uint8_t *data;
if (!msg)
return NULL;
hdr = (struct mtp_level_3_hdr *) msg->l2h;
hdr->ser_ind = MTP_SI_MNT_REG_MSG;
hdr->addr = MTP_ADDR(link->link_no % 16, link->set->dpc, link->set->opc);
mng = (struct mtp_level_3_mng *) msgb_put(msg, sizeof(*mng));
mng->cmn.h0 = MTP_TST_MSG_GRP;
mng->cmn.h1 = MTP_TST_MSG_SLTM;
mng->length = ARRAY_SIZE(test_ptrn);
data = msgb_put(msg, ARRAY_SIZE(test_ptrn));
memcpy(data, test_ptrn, ARRAY_SIZE(test_ptrn));
/* remember the last tst ptrn... once we have some */
memcpy(link->test_ptrn, test_ptrn, ARRAY_SIZE(test_ptrn));
return msg;
}
static void mtp_send_sltm(struct mtp_link *link)
{
struct msgb *msg;
link->sltm_pending = 1;
msg = mtp_create_sltm(link);
if (!msg) {
LOGP(DINP, LOGL_ERROR, "Failed to allocate SLTM on %s/%d.\n",
link->set->name, link->link_no);
return;
}
mtp_link_submit(link, msg);
}
static void mtp_sltm_t1_timeout(void *_link)
{
struct mtp_link *link = (struct mtp_link *) _link;
rate_ctr_inc(&link->ctrg->ctr[MTP_LNK_SLTM_TOUT]);
if (link->slta_misses == 0) {
LOGP(DINP, LOGL_ERROR,
"No SLTM response on link %s/%d.\n",
link->set->name, link->link_no);
++link->slta_misses;
mtp_send_sltm(link);
bsc_schedule_timer(&link->t1_timer, MTP_T1);
} else {
LOGP(DINP, LOGL_ERROR,
"Two missing SLTAs on link %s/%d.\n",
link->set->name, link->link_no);
bsc_del_timer(&link->t2_timer);
mtp_link_failure(link);
}
}
static void mtp_sltm_t2_timeout(void *_link)
{
struct mtp_link *link = (struct mtp_link *) _link;
if (!link->set->running) {
LOGP(DINP, LOGL_INFO,
"The linkset is not active. Stopping the link test on %s/%d.\n",
link->set->name, link->link_no);
return;
}
link->slta_misses = 0;
mtp_send_sltm(link);
bsc_schedule_timer(&link->t1_timer, MTP_T1);
if (link->set->sltm_once && link->was_up)
LOGP(DINP, LOGL_INFO, "Not sending SLTM again as configured on %s/%d.\n",
link->set->name, link->link_no);
else
bsc_schedule_timer(&link->t2_timer, MTP_T2);
}
void mtp_link_stop_link_test(struct mtp_link *link)
{
bsc_del_timer(&link->t1_timer);
bsc_del_timer(&link->t2_timer);
link->sltm_pending = 0;
}
void mtp_link_start_link_test(struct mtp_link *link)
{
mtp_sltm_t2_timeout(link);
}
int mtp_link_slta(struct mtp_link *link, uint16_t l3_len,
struct mtp_level_3_mng *mng)
{
if (mng->length != 14) {
LOGP(DINP, LOGL_ERROR, "Wrongly sized SLTA: %u\n", mng->length);
return -1;
}
if (l3_len != 16) {
LOGP(DINP, LOGL_ERROR, "Wrongly sized SLTA: %u\n", mng->length);
return -1;
}
if (memcmp(mng->data, link->test_ptrn, sizeof(link->test_ptrn)) != 0) {
LOGP(DINP, LOGL_ERROR, "Wrong test pattern SLTA\n");
return -1;
}
/* we had a matching slta */
bsc_del_timer(&link->t1_timer);
link->sltm_pending = 0;
link->was_up = 1;
return 0;
}
void mtp_link_failure(struct mtp_link *link)
{
if (link->blocked) {
LOGP(DINP, LOGL_ERROR, "Ignoring failure on blocked link %s/%d.\n",
link->set->name, link->link_no);
return;
}
LOGP(DINP, LOGL_ERROR, "Link %s/%d has failed, going to reset it.\n",
link->set->name, link->link_no);
rate_ctr_inc(&link->ctrg->ctr[MTP_LNK_ERROR]);
link->reset(link);
}
void mtp_link_block(struct mtp_link *link)
{
link->blocked = 1;
link->shutdown(link);
}
void mtp_link_unblock(struct mtp_link *link)
{
if (!link->blocked)
return;
link->blocked = 0;
link->reset(link);
}
static int dummy_arg1(struct mtp_link *link)
{
LOGP(DINP, LOGL_ERROR, "The link %d of linkset %d/%s is not typed.\n",
link->link_no, link->set->nr, link->set->name);
return 0;
}
static int dummy_arg2(struct mtp_link *link, struct msgb *msg)
{
LOGP(DINP, LOGL_ERROR, "The link %d of linkset %d/%s is not typed.\n",
link->link_no, link->set->nr, link->set->name);
msgb_free(msg);
return 0;
}
struct mtp_link *mtp_link_alloc(struct mtp_link_set *set)
{
struct mtp_link *link;
link = talloc_zero(set, struct mtp_link);
if (!link) {
LOGP(DINP, LOGL_ERROR, "Failed to allocate the link.\n");
return NULL;
}
link->link_no = set->nr_links++;
link->ctrg = rate_ctr_group_alloc(link,
mtp_link_rate_ctr_desc(), link->link_no);
if (!link->ctrg) {
LOGP(DINP, LOGL_ERROR, "Failed to allocate rate_ctr.\n");
talloc_free(link);
return NULL;
}
/* make sure a unconfigured link does not crash */
link->start = dummy_arg1;
link->write = dummy_arg2;
link->shutdown = dummy_arg1;
link->reset = dummy_arg1;
link->clear_queue = dummy_arg1;
link->pcap_fd = -1;
link->t1_timer.data = link;
link->t1_timer.cb = mtp_sltm_t1_timeout;
link->t2_timer.data = link;
link->t2_timer.cb = mtp_sltm_t2_timeout;
link->set = set;
llist_add_tail(&link->entry, &set->links);
mtp_link_set_init_slc(set);
return link;
}
struct mtp_link *mtp_link_num(struct mtp_link_set *set, int num)
{
struct mtp_link *link;
llist_for_each_entry(link, &set->links, entry)
if (link->link_no == num)
return link;
return NULL;
}
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