| /* 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; |
| } |