266 lines
6.6 KiB
C
266 lines
6.6 KiB
C
/* MTP level3 link */
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/*
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* (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org>
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* (C) 2010 by On-Waves
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* All Rights Reserved
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <mtp_data.h>
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#include <osmocom/mtp/mtp_level3.h>
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#include <cellmgr_debug.h>
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#include <counter.h>
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#include <osmocom/core/talloc.h>
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#include <string.h>
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static struct msgb *mtp_create_sltm(struct mtp_link *link)
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{
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const uint8_t test_ptrn[14] = { 'G', 'S', 'M', 'M', 'M', 'S', };
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struct mtp_level_3_hdr *hdr;
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struct mtp_level_3_mng *mng;
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struct msgb *msg = mtp_msg_alloc(link->set);
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uint8_t *data;
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if (!msg)
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return NULL;
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hdr = (struct mtp_level_3_hdr *) msg->l2h;
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hdr->ser_ind = MTP_SI_MNT_REG_MSG;
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hdr->addr = MTP_ADDR(link->nr % 16, link->set->dpc, link->set->opc);
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mng = (struct mtp_level_3_mng *) msgb_put(msg, sizeof(*mng));
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mng->cmn.h0 = MTP_TST_MSG_GRP;
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mng->cmn.h1 = MTP_TST_MSG_SLTM;
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mng->length = ARRAY_SIZE(test_ptrn);
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data = msgb_put(msg, ARRAY_SIZE(test_ptrn));
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memcpy(data, test_ptrn, ARRAY_SIZE(test_ptrn));
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/* remember the last tst ptrn... once we have some */
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memcpy(link->test_ptrn, test_ptrn, ARRAY_SIZE(test_ptrn));
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return msg;
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}
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static void mtp_send_sltm(struct mtp_link *link)
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{
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struct msgb *msg;
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link->sltm_pending = 1;
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msg = mtp_create_sltm(link);
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if (!msg) {
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LOGP(DINP, LOGL_ERROR, "Failed to allocate SLTM on link %d/%s of %d/%s.\n",
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link->nr, link->name, link->set->nr, link->set->name);
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return;
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}
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mtp_link_submit(link, msg);
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}
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static void mtp_sltm_t1_timeout(void *_link)
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{
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struct mtp_link *link = (struct mtp_link *) _link;
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rate_ctr_inc(&link->ctrg->ctr[MTP_LNK_SLTM_TOUT]);
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if (link->slta_misses == 0) {
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LOGP(DINP, LOGL_ERROR,
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"No SLTM response on link %d/%s of %d/%s.\n",
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link->nr, link->name, link->set->nr, link->set->name);
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++link->slta_misses;
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mtp_send_sltm(link);
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osmo_timer_schedule(&link->t1_timer, MTP_T1);
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} else {
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LOGP(DINP, LOGL_ERROR,
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"Two missing SLTAs on link %d/%s of %d/%s.\n",
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link->nr, link->name, link->set->nr, link->set->name);
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osmo_timer_del(&link->t2_timer);
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mtp_link_failure(link);
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}
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}
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static void mtp_sltm_t2_timeout(void *_link)
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{
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struct mtp_link *link = (struct mtp_link *) _link;
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if (!link->set->running) {
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LOGP(DINP, LOGL_INFO,
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"The linkset is not active. Stopping link test on %d/%s of %d/%s.\n",
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link->nr, link->name, link->set->nr, link->set->name);
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return;
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}
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link->slta_misses = 0;
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mtp_send_sltm(link);
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osmo_timer_schedule(&link->t1_timer, MTP_T1);
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if (link->set->sltm_once && link->was_up)
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LOGP(DINP, LOGL_INFO, "Not sending SLTM again on link %d/%s of %d/%s.\n",
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link->nr, link->name, link->set->nr, link->set->name);
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else
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osmo_timer_schedule(&link->t2_timer, MTP_T2);
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}
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void mtp_link_stop_link_test(struct mtp_link *link)
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{
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osmo_timer_del(&link->t1_timer);
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osmo_timer_del(&link->t2_timer);
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link->sltm_pending = 0;
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}
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void mtp_link_start_link_test(struct mtp_link *link)
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{
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if (link->blocked) {
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LOGP(DINP, LOGL_ERROR, "Not starting linktest on %d/%s of %d/%s.\n",
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link->nr, link->name, link->set->nr, link->set->name);
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return;
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}
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if (link->skip_link_test) {
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LOGP(DINP, LOGL_ERROR, "Skipping starting linktest on %d/%s of %d/%s.\n",
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link->nr, link->name, link->set->nr, link->set->name);
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link->sltm_pending = 0;
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link->was_up = 1;
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mtp_link_verified(link);
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return;
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}
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mtp_sltm_t2_timeout(link);
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}
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int mtp_link_slta(struct mtp_link *link, uint16_t l3_len,
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struct mtp_level_3_mng *mng)
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{
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if (mng->length != 14) {
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LOGP(DINP, LOGL_ERROR, "Wrongly sized SLTA: %u\n", mng->length);
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return -1;
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}
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if (l3_len != 16) {
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LOGP(DINP, LOGL_ERROR, "Wrongly sized SLTA: %u\n", mng->length);
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return -1;
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}
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if (memcmp(mng->data, link->test_ptrn, sizeof(link->test_ptrn)) != 0) {
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LOGP(DINP, LOGL_ERROR, "Wrong test pattern SLTA\n");
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return -1;
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}
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/* we had a matching slta */
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osmo_timer_del(&link->t1_timer);
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link->sltm_pending = 0;
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link->was_up = 1;
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return 0;
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}
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void mtp_link_failure(struct mtp_link *link)
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{
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if (link->blocked) {
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LOGP(DINP, LOGL_ERROR, "Ignoring failure on blocked link %d/%s on %d/%s.\n",
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link->nr, link->name, link->set->nr, link->set->name);
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return;
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}
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LOGP(DINP, LOGL_ERROR, "Link %d/%s of %d/%s has failed, going to reset it.\n",
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link->nr, link->name, link->set->nr, link->set->name);
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rate_ctr_inc(&link->ctrg->ctr[MTP_LNK_ERROR]);
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link->reset(link);
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}
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void mtp_link_block(struct mtp_link *link)
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{
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link->blocked = 1;
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link->shutdown(link);
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}
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void mtp_link_unblock(struct mtp_link *link)
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{
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if (!link->blocked)
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return;
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link->blocked = 0;
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link->reset(link);
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}
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static int dummy_arg1(struct mtp_link *link)
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{
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LOGP(DINP, LOGL_ERROR, "The link %d/%s of linkset %d/%s is not typed.\n",
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link->nr, link->name, link->set->nr, link->set->name);
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return 0;
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}
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static int dummy_arg2(struct mtp_link *link, struct msgb *msg)
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{
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LOGP(DINP, LOGL_ERROR, "The link %d/%s of linkset %d/%s is not typed.\n",
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link->nr, link->name, link->set->nr, link->set->name);
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msgb_free(msg);
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return 0;
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}
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struct mtp_link *mtp_link_alloc(struct mtp_link_set *set)
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{
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struct mtp_link *link;
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link = talloc_zero(set, struct mtp_link);
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if (!link) {
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LOGP(DINP, LOGL_ERROR, "Failed to allocate the link.\n");
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return NULL;
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}
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link->nr = set->nr_links++;
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link->ctrg = rate_ctr_group_alloc(link,
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mtp_link_rate_ctr_desc(), link->nr);
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if (!link->ctrg) {
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LOGP(DINP, LOGL_ERROR, "Failed to allocate rate_ctr.\n");
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talloc_free(link);
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return NULL;
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}
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/* make sure a unconfigured link does not crash */
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link->write = dummy_arg2;
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link->shutdown = dummy_arg1;
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link->reset = dummy_arg1;
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link->clear_queue = dummy_arg1;
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link->pcap_fd = -1;
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link->t1_timer.data = link;
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link->t1_timer.cb = mtp_sltm_t1_timeout;
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link->t2_timer.data = link;
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link->t2_timer.cb = mtp_sltm_t2_timeout;
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link->set = set;
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llist_add_tail(&link->entry, &set->links);
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mtp_link_set_init_slc(set);
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return link;
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}
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struct mtp_link *mtp_link_num(struct mtp_link_set *set, int num)
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{
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struct mtp_link *link;
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llist_for_each_entry(link, &set->links, entry)
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if (link->nr == num)
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return link;
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return NULL;
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}
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