296 lines
7.7 KiB
C
296 lines
7.7 KiB
C
/* Abis/IP interface routines utilizing libosmo-abis (Pablo) */
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/* (C) 2011 by Andreas Eversberg <jolly@eversberg.eu>
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* (C) 2011-2013 by Harald Welte <laforge@gnumonks.org>
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*
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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 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 "btsconfig.h"
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <netinet/in.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include <inttypes.h>
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#include <osmocom/core/select.h>
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#include <osmocom/core/timer.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/core/signal.h>
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#include <osmocom/core/macaddr.h>
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#include <osmocom/abis/abis.h>
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#include <osmocom/abis/e1_input.h>
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#include <osmocom/abis/ipaccess.h>
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#include <osmocom/gsm/ipa.h>
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#include <osmo-bts/logging.h>
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#include <osmo-bts/gsm_data.h>
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#include <osmo-bts/bts.h>
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#include <osmo-bts/rsl.h>
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#include <osmo-bts/oml.h>
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#include <osmo-bts/bts_model.h>
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static struct gsm_bts *g_bts;
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int abis_oml_sendmsg(struct msgb *msg)
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{
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struct gsm_bts *bts = msg->trx->bts;
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if (!bts->oml_link) {
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llist_add_tail(&msg->list, &bts->oml_queue);
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return 0;
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} else {
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/* osmo-bts uses msg->trx internally, but libosmo-abis uses
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* the signalling link at msg->dst */
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msg->dst = bts->oml_link;
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return abis_sendmsg(msg);
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}
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}
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static void drain_oml_queue(struct gsm_bts *bts)
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{
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struct msgb *msg, *msg2;
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llist_for_each_entry_safe(msg, msg2, &bts->oml_queue, list) {
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/* osmo-bts uses msg->trx internally, but libosmo-abis uses
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* the signalling link at msg->dst */
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llist_del(&msg->list);
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msg->dst = bts->oml_link;
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abis_sendmsg(msg);
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}
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}
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int abis_bts_rsl_sendmsg(struct msgb *msg)
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{
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OSMO_ASSERT(msg->trx);
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if (msg->trx->bts->variant == BTS_OSMO_OMLDUMMY) {
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msgb_free(msg);
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return 0;
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}
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/* osmo-bts uses msg->trx internally, but libosmo-abis uses
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* the signalling link at msg->dst */
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msg->dst = msg->trx->rsl_link;
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return abis_sendmsg(msg);
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}
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static struct e1inp_sign_link *sign_link_up(void *unit, struct e1inp_line *line,
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enum e1inp_sign_type type)
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{
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struct e1inp_sign_link *sign_link = NULL;
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struct gsm_bts_trx *trx;
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int trx_nr;
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switch (type) {
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case E1INP_SIGN_OML:
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LOGP(DABIS, LOGL_INFO, "OML Signalling link up\n");
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e1inp_ts_config_sign(&line->ts[E1INP_SIGN_OML-1], line);
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sign_link = g_bts->oml_link =
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e1inp_sign_link_create(&line->ts[E1INP_SIGN_OML-1],
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E1INP_SIGN_OML, NULL, 255, 0);
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if (clock_gettime(CLOCK_MONOTONIC, &g_bts->oml_conn_established_timestamp) != 0)
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memset(&g_bts->oml_conn_established_timestamp, 0,
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sizeof(g_bts->oml_conn_established_timestamp));
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drain_oml_queue(g_bts);
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sign_link->trx = g_bts->c0;
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bts_link_estab(g_bts);
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break;
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default:
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trx_nr = type - E1INP_SIGN_RSL;
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LOGP(DABIS, LOGL_INFO, "RSL Signalling link for TRX%d up\n",
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trx_nr);
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trx = gsm_bts_trx_num(g_bts, trx_nr);
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if (!trx) {
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LOGP(DABIS, LOGL_ERROR, "TRX%d does not exist!\n",
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trx_nr);
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break;
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}
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e1inp_ts_config_sign(&line->ts[type-1], line);
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sign_link = trx->rsl_link =
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e1inp_sign_link_create(&line->ts[type-1],
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E1INP_SIGN_RSL, NULL, 0, 0);
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sign_link->trx = trx;
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trx_link_estab(trx);
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break;
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}
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return sign_link;
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}
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static void sign_link_down(struct e1inp_line *line)
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{
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struct gsm_bts_trx *trx;
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LOGP(DABIS, LOGL_ERROR, "Signalling link down\n");
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/* First remove the OML signalling link */
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if (g_bts->oml_link) {
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struct timespec now;
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e1inp_sign_link_destroy(g_bts->oml_link);
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/* Log a special notice if the OML connection was dropped relatively quickly. */
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if (g_bts->oml_conn_established_timestamp.tv_sec != 0 && clock_gettime(CLOCK_MONOTONIC, &now) == 0 &&
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g_bts->oml_conn_established_timestamp.tv_sec + OSMO_BTS_OML_CONN_EARLY_DISCONNECT >= now.tv_sec) {
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LOGP(DABIS, LOGL_FATAL, "OML link was closed early within %" PRIu64 " seconds. "
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"If this situation persists, please check your BTS and BSC configuration files for errors. "
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"A common error is a mismatch between unit_id configuration parameters of BTS and BSC.\n",
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(uint64_t)(now.tv_sec - g_bts->oml_conn_established_timestamp.tv_sec));
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}
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}
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g_bts->oml_link = NULL;
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memset(&g_bts->oml_conn_established_timestamp, 0, sizeof(g_bts->oml_conn_established_timestamp));
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/* Then iterate over the RSL signalling links */
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llist_for_each_entry(trx, &g_bts->trx_list, list) {
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if (trx->rsl_link) {
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e1inp_sign_link_destroy(trx->rsl_link);
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trx->rsl_link = NULL;
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}
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}
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bts_model_abis_close(g_bts);
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}
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/* callback for incoming messages from A-bis/IP */
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static int sign_link_cb(struct msgb *msg)
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{
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struct e1inp_sign_link *link = msg->dst;
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/* osmo-bts code assumes msg->trx is set, but libosmo-abis works
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* with the sign_link stored in msg->dst, so we have to convert
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* here */
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msg->trx = link->trx;
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switch (link->type) {
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case E1INP_SIGN_OML:
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down_oml(link->trx->bts, msg);
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break;
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case E1INP_SIGN_RSL:
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down_rsl(link->trx, msg);
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break;
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default:
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msgb_free(msg);
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break;
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}
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return 0;
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}
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uint32_t get_signlink_remote_ip(struct e1inp_sign_link *link)
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{
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int fd = link->ts->driver.ipaccess.fd.fd;
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struct sockaddr_in sin;
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socklen_t slen = sizeof(sin);
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int rc;
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rc = getpeername(fd, (struct sockaddr *)&sin, &slen);
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if (rc < 0) {
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LOGP(DOML, LOGL_ERROR, "Cannot determine remote IP Addr: %s\n",
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strerror(errno));
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return 0;
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}
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/* we assume that the socket is AF_INET. As Abis/IP contains
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* lots of hard-coded IPv4 addresses, this safe */
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OSMO_ASSERT(sin.sin_family == AF_INET);
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return ntohl(sin.sin_addr.s_addr);
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}
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static int inp_s_cbfn(unsigned int subsys, unsigned int signal,
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void *hdlr_data, void *signal_data)
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{
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if (subsys != SS_L_INPUT)
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return 0;
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struct input_signal_data *isd = signal_data;
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DEBUGP(DABIS, "Input Signal %s received for link_type=%s\n",
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get_value_string(e1inp_signal_names, signal), e1inp_signtype_name(isd->link_type));
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return 0;
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}
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static struct ipaccess_unit bts_dev_info = {
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.unit_name = "sysmoBTS",
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.equipvers = "", /* FIXME: read this from hw */
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.swversion = PACKAGE_VERSION,
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.location1 = "",
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.location2 = "",
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.serno = "",
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};
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static struct e1inp_line_ops line_ops = {
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.cfg = {
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.ipa = {
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.role = E1INP_LINE_R_BTS,
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.dev = &bts_dev_info,
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},
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},
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.sign_link_up = sign_link_up,
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.sign_link_down = sign_link_down,
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.sign_link = sign_link_cb,
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};
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void abis_init(struct gsm_bts *bts)
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{
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g_bts = bts;
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oml_init(&bts->mo);
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libosmo_abis_init(NULL);
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osmo_signal_register_handler(SS_L_INPUT, &inp_s_cbfn, bts);
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}
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struct e1inp_line *abis_open(struct gsm_bts *bts, char *dst_host,
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char *model_name)
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{
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struct e1inp_line *line;
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/* patch in various data from VTY and other sources */
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line_ops.cfg.ipa.addr = dst_host;
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osmo_get_macaddr(bts_dev_info.mac_addr, "eth0");
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bts_dev_info.site_id = bts->ip_access.site_id;
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bts_dev_info.bts_id = bts->ip_access.bts_id;
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bts_dev_info.unit_name = model_name;
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if (bts->description)
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bts_dev_info.unit_name = bts->description;
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bts_dev_info.location2 = model_name;
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line = e1inp_line_find(0);
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if (!line)
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line = e1inp_line_create(0, "ipa");
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if (!line)
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return NULL;
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e1inp_line_bind_ops(line, &line_ops);
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/* This will open the OML connection now */
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if (e1inp_line_update(line) < 0)
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return NULL;
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return line;
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}
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