580 lines
14 KiB
C
580 lines
14 KiB
C
/* OpenBSC Abis input driver for ip.access */
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/* (C) 2009 by Harald Welte <laforge@gnumonks.org>
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* (C) 2010 by Holger Hans Peter Freyther
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* (C) 2010 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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#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/core/logging.h>
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#include <talloc.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/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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static void *tall_ipa_ctx;
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#define TS1_ALLOC_SIZE 900
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/*
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* Common propietary IPA messages:
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* - PONG: in reply to PING.
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* - ID_REQUEST: first messages once OML has been established.
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* - ID_ACK: in reply to ID_ACK.
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*/
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const uint8_t ipa_pong_msg[] = {
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0, 1, IPAC_PROTO_IPACCESS, IPAC_MSGT_PONG
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};
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const uint8_t ipa_id_ack_msg[] = {
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0, 1, IPAC_PROTO_IPACCESS, IPAC_MSGT_ID_ACK
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};
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const uint8_t ipa_id_req_msg[] = {
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0, 17, IPAC_PROTO_IPACCESS, IPAC_MSGT_ID_GET,
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0x01, IPAC_IDTAG_UNIT,
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0x01, IPAC_IDTAG_MACADDR,
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0x01, IPAC_IDTAG_LOCATION1,
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0x01, IPAC_IDTAG_LOCATION2,
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0x01, IPAC_IDTAG_EQUIPVERS,
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0x01, IPAC_IDTAG_SWVERSION,
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0x01, IPAC_IDTAG_UNITNAME,
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0x01, IPAC_IDTAG_SERNR,
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};
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static int ipaccess_send(int fd, const void *msg, size_t msglen)
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{
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int ret;
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ret = write(fd, msg, msglen);
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if (ret < 0)
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return ret;
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if (ret < msglen) {
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LOGP(DINP, LOGL_ERROR, "ipaccess_send: short write\n");
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return -EIO;
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}
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return ret;
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}
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int ipaccess_send_pong(int fd)
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{
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return ipaccess_send(fd, ipa_pong_msg, sizeof(ipa_pong_msg));
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}
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int ipaccess_send_id_ack(int fd)
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{
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return ipaccess_send(fd, ipa_id_ack_msg, sizeof(ipa_id_ack_msg));
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}
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int ipaccess_send_id_req(int fd)
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{
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return ipaccess_send(fd, ipa_id_req_msg, sizeof(ipa_id_req_msg));
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}
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/* base handling of the ip.access protocol */
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int ipaccess_rcvmsg_base(struct msgb *msg,
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struct osmo_fd *bfd)
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{
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uint8_t msg_type = *(msg->l2h);
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int ret = 0;
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switch (msg_type) {
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case IPAC_MSGT_PING:
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ret = ipaccess_send_pong(bfd->fd);
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break;
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case IPAC_MSGT_PONG:
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DEBUGP(DMI, "PONG!\n");
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break;
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case IPAC_MSGT_ID_ACK:
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DEBUGP(DMI, "ID_ACK? -> ACK!\n");
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ret = ipaccess_send_id_ack(bfd->fd);
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break;
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}
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return 0;
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}
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static int ipaccess_rcvmsg(struct e1inp_line *line, struct msgb *msg,
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struct osmo_fd *bfd)
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{
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uint8_t msg_type = *(msg->l2h);
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/* handle base messages */
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ipaccess_rcvmsg_base(msg, bfd);
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switch (msg_type) {
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case IPAC_MSGT_ID_RESP:
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DEBUGP(DMI, "ID_RESP\n");
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if (!line->ops->sign_link_up) {
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LOGP(DINP, LOGL_ERROR, "Fix your application, "
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"no 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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line->ops->sign_link_up(msg, line, bfd->priv_nr);
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break;
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}
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return 0;
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}
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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 = NULL;
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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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/* skip if RSL line is not set yet. */
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if (e1i_ts && 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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talloc_free(bfd);
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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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/* Now that we're sure that we've got a line for socket. */
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e1i_ts = &line->ts[ts_nr-1];
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hh = (struct ipaccess_head *) msg->data;
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if (hh->proto == IPAC_PROTO_IPACCESS) {
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ipaccess_rcvmsg(line, msg, bfd);
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msgb_free(msg);
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return ret;
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}
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/* BIG FAT WARNING: bfd might no longer exist here, since ipaccess_rcvmsg()
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* might have free'd it !!! */
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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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void ipaccess_prepend_header_ext(struct msgb *msg, int proto)
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{
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struct ipaccess_head_ext *hh_ext;
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/* prepend the osmo ip.access header extension */
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hh_ext = (struct ipaccess_head_ext *) msgb_push(msg, sizeof(*hh_ext));
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hh_ext->proto = proto;
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}
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void ipaccess_prepend_header(struct msgb *msg, int proto)
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{
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struct ipaccess_head *hh;
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/* prepend the ip.access header */
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hh = (struct ipaccess_head *) msgb_push(msg, sizeof(*hh));
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hh->len = htons(msg->len - sizeof(*hh));
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hh->proto = proto;
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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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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 ipaccess_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 ipaccess_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 ipaccess_driver = {
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.name = "ipa",
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.want_write = ts_want_write,
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.line_update = ipaccess_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 ipaccess_bsc_oml_cb(struct ipa_server_link *link, int fd)
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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 = link->line;
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struct e1inp_ts *e1i_ts;
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struct osmo_fd *bfd;
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bfd = talloc_zero(tall_ipa_ctx, struct osmo_fd);
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if (!bfd)
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return -ENOMEM;
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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->fd = fd;
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bfd->data = line;
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bfd->priv_nr = E1INP_SIGN_OML;
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bfd->cb = ipaccess_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(bfd);
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return ret;
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}
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/* Request ID. FIXME: request LOCATION, HW/SW VErsion, Unit Name, Serno */
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ret = ipaccess_send_id_req(bfd->fd);
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return ret;
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}
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static int ipaccess_bsc_rsl_cb(struct ipa_server_link *link, int fd)
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{
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struct osmo_fd *bfd;
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int ret;
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bfd = talloc_zero(tall_ipa_ctx, struct osmo_fd);
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if (!bfd)
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return -ENOMEM;
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bfd->fd = fd;
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bfd->priv_nr = E1INP_SIGN_RSL;
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bfd->cb = ipaccess_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(bfd);
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return ret;
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}
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/* Request ID. FIXME: request LOCATION, HW/SW VErsion, Unit Name, Serno */
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ret = ipaccess_send_id_req(bfd->fd);
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return 0;
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}
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static int ipaccess_bts_cb(struct ipa_client_link *link, struct msgb *msg)
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{
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struct ipaccess_head *hh = (struct ipaccess_head *) msg->data;
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struct e1inp_ts *e1i_ts = NULL;
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struct e1inp_sign_link *sign_link;
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/* special handling for IPA CCM. */
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if (hh->proto == IPAC_PROTO_IPACCESS) {
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uint8_t msg_type = *(msg->l2h);
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/* ping, pong and acknowledgment cases. */
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ipaccess_rcvmsg_base(msg, &link->ofd);
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/* this is a request for identification from the BSC. */
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if (msg_type == IPAC_MSGT_ID_GET) {
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LOGP(DINP, LOGL_NOTICE, "received ID get\n");
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if (!link->line->ops->sign_link_up) {
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LOGP(DINP, LOGL_ERROR, "Fix your application, "
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"no 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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link->line->ops->sign_link_up(msg, link->line,
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link->port == IPA_TCP_PORT_OML ?
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E1INP_SIGN_OML : E1INP_SIGN_RSL);
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}
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return 0;
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} else if (link->port == IPA_TCP_PORT_OML)
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e1i_ts = &link->line->ts[0];
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else if (link->port == IPA_TCP_PORT_RSL)
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e1i_ts = &link->line->ts[1];
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/* look up for some existing signaling link. */
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sign_link = e1inp_lookup_sign_link(e1i_ts, hh->proto, 0);
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if (sign_link == NULL) {
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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 = sign_link;
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/* XXX better use e1inp_ts_rx? */
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if (!link->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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link->line->ops->sign_link(msg, link->line, sign_link);
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return 0;
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}
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static int ipaccess_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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struct ipa_server_link *oml_link, *rsl_link;
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LOGP(DINP, LOGL_NOTICE, "enabling ipaccess BSC mode\n");
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oml_link = ipa_server_link_create(tall_ipa_ctx, line,
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"0.0.0.0", IPA_TCP_PORT_OML,
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ipaccess_bsc_oml_cb, NULL);
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if (oml_link == NULL) {
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LOGP(DINP, LOGL_ERROR, "cannot create OML "
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"BSC link: %s\n", strerror(errno));
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return -ENOMEM;
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}
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if (ipa_server_link_open(oml_link) < 0) {
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LOGP(DINP, LOGL_ERROR, "cannot open OML BSC link: %s\n",
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strerror(errno));
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ipa_server_link_close(oml_link);
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ipa_server_link_destroy(oml_link);
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return -EIO;
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}
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rsl_link = ipa_server_link_create(tall_ipa_ctx, line,
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"0.0.0.0", IPA_TCP_PORT_RSL,
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ipaccess_bsc_rsl_cb, NULL);
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if (rsl_link == NULL) {
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LOGP(DINP, LOGL_ERROR, "cannot create RSL "
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"BSC link: %s\n", strerror(errno));
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return -ENOMEM;
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}
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if (ipa_server_link_open(rsl_link) < 0) {
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LOGP(DINP, LOGL_ERROR, "cannot open RSL BSC link: %s\n",
|
|
strerror(errno));
|
|
ipa_server_link_close(rsl_link);
|
|
ipa_server_link_destroy(rsl_link);
|
|
return -EIO;
|
|
}
|
|
ret = 0;
|
|
break;
|
|
}
|
|
case E1INP_LINE_R_BTS: {
|
|
struct ipa_client_link *link, *rsl_link;
|
|
|
|
LOGP(DINP, LOGL_NOTICE, "enabling ipaccess BTS mode\n");
|
|
|
|
link = ipa_client_link_create(tall_ipa_ctx, line,
|
|
addr, IPA_TCP_PORT_OML,
|
|
ipaccess_bts_cb, NULL);
|
|
if (link == NULL) {
|
|
LOGP(DINP, LOGL_ERROR, "cannot create OML "
|
|
"BTS link: %s\n", strerror(errno));
|
|
return -ENOMEM;
|
|
}
|
|
if (ipa_client_link_open(link) < 0) {
|
|
LOGP(DINP, LOGL_ERROR, "cannot open OML BTS link: %s\n",
|
|
strerror(errno));
|
|
ipa_client_link_close(link);
|
|
ipa_client_link_destroy(link);
|
|
return -EIO;
|
|
}
|
|
rsl_link = ipa_client_link_create(tall_ipa_ctx, line,
|
|
addr, IPA_TCP_PORT_RSL,
|
|
ipaccess_bts_cb, NULL);
|
|
if (rsl_link == NULL) {
|
|
LOGP(DINP, LOGL_ERROR, "cannot create RSL "
|
|
"BTS link: %s\n", strerror(errno));
|
|
return -ENOMEM;
|
|
}
|
|
if (ipa_client_link_open(rsl_link) < 0) {
|
|
LOGP(DINP, LOGL_ERROR, "cannot open RSL BTS link: %s\n",
|
|
strerror(errno));
|
|
ipa_client_link_close(rsl_link);
|
|
ipa_client_link_destroy(rsl_link);
|
|
return -EIO;
|
|
}
|
|
ret = 0;
|
|
break;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/* Actively connect to a BTS. Currently used by ipaccess-config.c */
|
|
int ipaccess_connect(struct e1inp_line *line, struct sockaddr_in *sa)
|
|
{
|
|
struct e1inp_ts *e1i_ts = &line->ts[0];
|
|
struct osmo_fd *bfd = &e1i_ts->driver.ipaccess.fd;
|
|
int ret, on = 1;
|
|
|
|
bfd->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
|
|
bfd->cb = ipaccess_fd_cb;
|
|
bfd->when = BSC_FD_READ | BSC_FD_WRITE;
|
|
bfd->data = line;
|
|
bfd->priv_nr = PRIV_OML;
|
|
|
|
if (bfd->fd < 0) {
|
|
LOGP(DINP, LOGL_ERROR, "could not create TCP socket.\n");
|
|
return -EIO;
|
|
}
|
|
|
|
setsockopt(bfd->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
|
|
|
|
ret = connect(bfd->fd, (struct sockaddr *) sa, sizeof(*sa));
|
|
if (ret < 0) {
|
|
LOGP(DINP, LOGL_ERROR, "could not connect socket\n");
|
|
close(bfd->fd);
|
|
return ret;
|
|
}
|
|
|
|
ret = osmo_fd_register(bfd);
|
|
if (ret < 0) {
|
|
close(bfd->fd);
|
|
return ret;
|
|
}
|
|
|
|
line->driver = &ipaccess_driver;
|
|
|
|
return ret;
|
|
//return e1inp_line_register(line);
|
|
}
|
|
|
|
void e1inp_ipaccess_init(void)
|
|
{
|
|
tall_ipa_ctx = talloc_named_const(libosmo_abis_ctx, 1, "ipa");
|
|
e1inp_driver_register(&ipaccess_driver);
|
|
}
|