381 lines
9.2 KiB
C
381 lines
9.2 KiB
C
/* OpenBSC Abis input driver for HSL Femto */
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/* (C) 2011 by Harald Welte <laforge@gnumonks.org>
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* (C) 2011 by On-Waves
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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 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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/* HSL uses a much more primitive/simplified version of the IPA multiplex.
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*
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* They have taken out the nice parts like the ID_GET / ID_RESP for resolving
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* the UNIT ID, as well as the keepalive ping/pong messages. Furthermore, the
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* Stream Identifiers are fixed on the BTS side (RSL always 0, OML always 0xff)
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* and both OML+RSL share a single TCP connection.
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*
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* Other oddities include the encapsulation of BSSGP messages in the L3_INFO IE
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* of RSL
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*/
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#include "internal.h"
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h>
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#include <time.h>
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#include <sys/fcntl.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <arpa/inet.h>
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#include <osmocom/core/select.h>
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#include <osmocom/gsm/tlv.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/abis/e1_input.h>
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#include <osmocom/core/logging.h>
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#include <osmocom/abis/ipaccess.h>
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#include <osmocom/core/socket.h>
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#include <osmocom/abis/logging.h>
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#include <osmocom/abis/ipa.h>
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#include <talloc.h>
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#define HSL_TCP_PORT 2500
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#define HSL_PROTO_DEBUG 0xdd
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#define PRIV_OML 1
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#define PRIV_RSL 2
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static void *tall_hsl_ctx;
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/* data structure for one E1 interface with A-bis */
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struct hsl_e1_handle {
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struct osmo_fd listen_fd;
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struct gsm_network *gsmnet;
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};
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static struct hsl_e1_handle *e1h;
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#define TS1_ALLOC_SIZE 900
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static int handle_ts1_read(struct osmo_fd *bfd)
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{
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struct e1inp_line *line = bfd->data;
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unsigned int ts_nr = bfd->priv_nr;
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struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1];
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struct e1inp_sign_link *link;
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struct ipaccess_head *hh;
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struct msgb *msg;
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int ret = 0, error;
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error = ipa_msg_recv(bfd->fd, &msg);
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if (error <= 0) {
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if (e1i_ts->line->ops->error)
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e1i_ts->line->ops->error(NULL, line, ts_nr, error);
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if (error == 0) {
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osmo_fd_unregister(bfd);
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close(bfd->fd);
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bfd->fd = -1;
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}
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return error;
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}
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DEBUGP(DMI, "RX %u: %s\n", ts_nr, osmo_hexdump(msgb_l2(msg), msgb_l2len(msg)));
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hh = (struct ipaccess_head *) msg->data;
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if (hh->proto == HSL_PROTO_DEBUG) {
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LOGP(DINP, LOGL_NOTICE, "HSL debug: %s\n", msg->data + sizeof(*hh));
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msgb_free(msg);
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return ret;
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}
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/* HSL proprietary RSL extension */
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if (hh->proto == 0 && (msg->l2h[0] == 0x81 || msg->l2h[0] == 0x80)) {
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if (!line->ops->sign_link_up) {
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LOGP(DINP, LOGL_ERROR, "Fix your application, no "
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"action set if the signalling link "
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"becomes ready.\n");
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return -EINVAL;
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}
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ret = line->ops->sign_link_up(msg, line, E1INP_SIGN_RSL);
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if (ret < 0) {
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/* FIXME: close connection */
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if (line->ops->error)
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line->ops->error(msg, line,
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E1INP_SIGN_RSL, -EBADMSG);
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return ret;
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} else if (ret == 1)
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return 0;
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/* else: continue... */
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}
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#ifdef HSL_SR_1_0
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/* HSL for whatever reason chose to use 0x81 instead of 0x80 for FOM */
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if (hh->proto == 255 && msg->l2h[0] == (ABIS_OM_MDISC_FOM | 0x01))
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msg->l2h[0] = ABIS_OM_MDISC_FOM;
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#endif
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link = e1inp_lookup_sign_link(e1i_ts, hh->proto, 0);
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if (!link) {
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LOGP(DINP, LOGL_ERROR, "no matching signalling link for "
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"hh->proto=0x%02x\n", hh->proto);
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msgb_free(msg);
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return -EIO;
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}
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msg->dst = link;
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/* XXX: better use e1inp_ts_rx? */
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if (!e1i_ts->line->ops->sign_link) {
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LOGP(DINP, LOGL_ERROR, "Fix your application, "
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"no action set for signalling messages.\n");
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return -ENOENT;
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}
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e1i_ts->line->ops->sign_link(msg, line, link);
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return ret;
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}
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static int ts_want_write(struct e1inp_ts *e1i_ts)
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{
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e1i_ts->driver.ipaccess.fd.when |= BSC_FD_WRITE;
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return 0;
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}
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static void timeout_ts1_write(void *data)
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{
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struct e1inp_ts *e1i_ts = (struct e1inp_ts *)data;
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/* trigger write of ts1, due to tx delay timer */
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ts_want_write(e1i_ts);
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}
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static int handle_ts1_write(struct osmo_fd *bfd)
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{
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struct e1inp_line *line = bfd->data;
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unsigned int ts_nr = bfd->priv_nr;
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struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1];
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struct e1inp_sign_link *sign_link;
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struct msgb *msg;
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uint8_t proto;
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int ret;
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bfd->when &= ~BSC_FD_WRITE;
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/* get the next msg for this timeslot */
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msg = e1inp_tx_ts(e1i_ts, &sign_link);
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if (!msg) {
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/* no message after tx delay timer */
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return 0;
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}
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switch (sign_link->type) {
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case E1INP_SIGN_OML:
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proto = IPAC_PROTO_OML;
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#ifdef HSL_SR_1_0
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/* HSL uses 0x81 for FOM for some reason */
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if (msg->data[0] == ABIS_OM_MDISC_FOM)
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msg->data[0] = ABIS_OM_MDISC_FOM | 0x01;
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#endif
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break;
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case E1INP_SIGN_RSL:
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proto = IPAC_PROTO_RSL;
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break;
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default:
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msgb_free(msg);
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bfd->when |= BSC_FD_WRITE; /* come back for more msg */
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return -EINVAL;
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}
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msg->l2h = msg->data;
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ipaccess_prepend_header(msg, sign_link->tei);
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DEBUGP(DMI, "TX %u: %s\n", ts_nr, osmo_hexdump(msg->l2h, msgb_l2len(msg)));
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ret = send(bfd->fd, msg->data, msg->len, 0);
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msgb_free(msg);
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/* set tx delay timer for next event */
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e1i_ts->sign.tx_timer.cb = timeout_ts1_write;
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e1i_ts->sign.tx_timer.data = e1i_ts;
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/* Reducing this might break the nanoBTS 900 init. */
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osmo_timer_schedule(&e1i_ts->sign.tx_timer, 0, e1i_ts->sign.delay);
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return ret;
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}
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/* callback from select.c in case one of the fd's can be read/written */
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static int hsl_fd_cb(struct osmo_fd *bfd, unsigned int what)
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{
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struct e1inp_line *line = bfd->data;
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unsigned int ts_nr = bfd->priv_nr;
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unsigned int idx = ts_nr-1;
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struct e1inp_ts *e1i_ts;
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int rc = 0;
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/* In case of early RSL we might not yet have a line */
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if (line)
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e1i_ts = &line->ts[idx];
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if (!line || e1i_ts->type == E1INP_TS_TYPE_SIGN) {
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if (what & BSC_FD_READ)
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rc = handle_ts1_read(bfd);
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if (what & BSC_FD_WRITE)
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rc = handle_ts1_write(bfd);
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} else
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LOGP(DINP, LOGL_ERROR, "unknown E1 TS type %u\n", e1i_ts->type);
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return rc;
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}
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static int hsl_line_update(struct e1inp_line *line,
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enum e1inp_line_role role, const char *addr);
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struct e1inp_driver hsl_driver = {
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.name = "hsl",
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.want_write = ts_want_write,
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.line_update = hsl_line_update,
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.default_delay = 0,
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};
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/* callback of the OML listening filedescriptor */
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static int listen_fd_cb(struct osmo_fd *listen_bfd, unsigned int what)
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{
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int ret;
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int idx = 0;
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int i;
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struct e1inp_line *line = listen_bfd->data;
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struct e1inp_ts *e1i_ts;
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struct osmo_fd *bfd;
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struct sockaddr_in sa;
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socklen_t sa_len = sizeof(sa);
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if (!(what & BSC_FD_READ))
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return 0;
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ret = accept(listen_bfd->fd, (struct sockaddr *) &sa, &sa_len);
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if (ret < 0) {
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perror("accept");
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return ret;
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}
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LOGP(DINP, LOGL_NOTICE, "accept()ed new HSL link from %s\n",
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inet_ntoa(sa.sin_addr));
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/* create virrtual E1 timeslots for signalling */
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e1inp_ts_config_sign(&line->ts[1-1], line);
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/* initialize the fds */
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for (i = 0; i < ARRAY_SIZE(line->ts); ++i)
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line->ts[i].driver.ipaccess.fd.fd = -1;
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e1i_ts = &line->ts[idx];
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bfd = &e1i_ts->driver.ipaccess.fd;
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bfd->fd = ret;
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bfd->data = line;
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bfd->priv_nr = PRIV_OML;
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bfd->cb = hsl_fd_cb;
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bfd->when = BSC_FD_READ;
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ret = osmo_fd_register(bfd);
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if (ret < 0) {
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LOGP(DINP, LOGL_ERROR, "could not register FD\n");
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close(bfd->fd);
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talloc_free(line);
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return ret;
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}
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return ret;
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}
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static int hsl_bts_process(struct ipa_client_link *link, struct msgb *msg)
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{
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/* XXX: not implemented yet. */
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return 0;
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}
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static int hsl_line_update(struct e1inp_line *line,
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enum e1inp_line_role role, const char *addr)
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{
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int ret = -ENOENT;
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switch(role) {
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case E1INP_LINE_R_BSC:
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LOGP(DINP, LOGL_NOTICE, "enabling hsl BSC mode\n");
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ret = osmo_sock_init(AF_INET, SOCK_STREAM, IPPROTO_TCP,
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addr, HSL_TCP_PORT, OSMO_SOCK_F_BIND);
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if (ret < 0)
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return ret;
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e1h->listen_fd.fd = ret;
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e1h->listen_fd.when |= BSC_FD_READ;
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e1h->listen_fd.cb = listen_fd_cb;
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e1h->listen_fd.data = line;
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if (osmo_fd_register(&e1h->listen_fd) < 0) {
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close(ret);
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return ret;
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}
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break;
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case E1INP_LINE_R_BTS: {
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struct ipa_client_link *link;
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LOGP(DINP, LOGL_NOTICE, "enabling hsl BTS mode\n");
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link = ipa_client_link_create(tall_hsl_ctx, line, addr,
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HSL_TCP_PORT, hsl_bts_process,
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NULL);
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if (link == NULL) {
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LOGP(DINP, LOGL_ERROR, "cannot create BTS link: %s\n",
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strerror(errno));
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return -ENOMEM;
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}
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if (ipa_client_link_open(link) < 0) {
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LOGP(DINP, LOGL_ERROR, "cannot open BTS link: %s\n",
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strerror(errno));
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ipa_client_link_close(link);
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ipa_client_link_destroy(link);
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return -EIO;
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}
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ret = 0;
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break;
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}
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default:
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break;
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}
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return ret;
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}
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int hsl_setup(struct gsm_network *gsmnet)
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{
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e1h->gsmnet = gsmnet;
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return 0;
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}
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void e1inp_hsl_init(void)
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{
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tall_hsl_ctx = talloc_named_const(libosmo_abis_ctx, 1, "hsl");
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e1h = talloc_zero(tall_hsl_ctx, struct hsl_e1_handle);
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if (!e1h)
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return;
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e1inp_driver_register(&hsl_driver);
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}
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