598 lines
14 KiB
C
598 lines
14 KiB
C
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/* OpenBSC Abis input driver for ip.access */
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/* (C) 2009 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 General Public License as published by
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* the Free Software Foundation; either version 2 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 General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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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/types.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 <openbsc/select.h>
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#include <openbsc/tlv.h>
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#include <openbsc/msgb.h>
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#include <openbsc/debug.h>
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#include <openbsc/gsm_data.h>
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#include <openbsc/abis_nm.h>
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#include <openbsc/abis_rsl.h>
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#include <openbsc/subchan_demux.h>
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#include <openbsc/e1_input.h>
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#include <openbsc/ipaccess.h>
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/* data structure for one E1 interface with A-bis */
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struct ia_e1_handle {
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struct bsc_fd listen_fd;
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struct bsc_fd rsl_listen_fd;
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struct gsm_network *gsmnet;
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};
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static struct ia_e1_handle *e1h;
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#define TS1_ALLOC_SIZE 300
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static const u_int8_t pong[] = { 0, 1, IPAC_PROTO_IPACCESS, IPAC_MSGT_PONG };
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static const u_int8_t id_ack[] = { 0, 1, IPAC_PROTO_IPACCESS, IPAC_MSGT_ID_ACK };
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static const u_int8_t id_req[] = { 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 const char *idtag_names[] = {
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[IPAC_IDTAG_SERNR] = "Serial_Number",
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[IPAC_IDTAG_UNITNAME] = "Unit_Name",
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[IPAC_IDTAG_LOCATION1] = "Location_1",
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[IPAC_IDTAG_LOCATION2] = "Location_2",
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[IPAC_IDTAG_EQUIPVERS] = "Equipment_Version",
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[IPAC_IDTAG_SWVERSION] = "Software_Version",
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[IPAC_IDTAG_IPADDR] = "IP_Address",
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[IPAC_IDTAG_MACADDR] = "MAC_Address",
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[IPAC_IDTAG_UNIT] = "Unit_ID",
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};
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static const char *ipac_idtag_name(int tag)
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{
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if (tag >= ARRAY_SIZE(idtag_names))
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return "unknown";
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return idtag_names[tag];
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}
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static int ipac_idtag_parse(struct tlv_parsed *dec, unsigned char *buf, int len)
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{
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u_int8_t t_len;
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u_int8_t t_tag;
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u_int8_t *cur = buf;
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while (cur < buf + len) {
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t_len = *cur++;
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t_tag = *cur++;
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DEBUGPC(DMI, "%s='%s' ", ipac_idtag_name(t_tag), cur);
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dec->lv[t_tag].len = t_len;
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dec->lv[t_tag].val = cur;
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cur += t_len;
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}
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return 0;
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}
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struct gsm_bts *find_bts_by_unitid(struct gsm_network *net,
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u_int16_t site_id, u_int16_t bts_id)
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{
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int i;
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for (i = 0; i < net->num_bts; i++) {
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struct gsm_bts *bts = &net->bts[i];
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if (!is_ipaccess_bts(bts))
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continue;
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if (bts->ip_access.site_id == site_id &&
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bts->ip_access.bts_id == bts_id)
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return bts;
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}
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return NULL;
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}
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static int parse_unitid(const char *str, u_int16_t *site_id, u_int16_t *bts_id,
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u_int16_t *trx_id)
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{
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unsigned long ul;
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char *endptr;
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const char *nptr;
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nptr = str;
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ul = strtoul(nptr, &endptr, 10);
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if (endptr <= nptr)
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return -EINVAL;
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if (site_id)
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*site_id = ul & 0xffff;
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if (*endptr++ != '/')
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return -EINVAL;
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nptr = endptr;
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ul = strtoul(nptr, &endptr, 10);
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if (endptr <= nptr)
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return -EINVAL;
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if (bts_id)
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*bts_id = ul & 0xffff;
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if (*endptr++ != '/')
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return -EINVAL;
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nptr = endptr;
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ul = strtoul(nptr, &endptr, 10);
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if (endptr <= nptr)
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return -EINVAL;
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if (trx_id)
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*trx_id = ul & 0xffff;
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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 bsc_fd *bfd)
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{
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struct tlv_parsed tlvp;
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u_int8_t msg_type = *(msg->l2h);
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u_int16_t site_id, bts_id, trx_id;
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struct gsm_bts *bts;
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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 = write(bfd->fd, pong, sizeof(pong));
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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_RESP:
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DEBUGP(DMI, "ID_RESP ");
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/* parse tags, search for Unit ID */
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ipac_idtag_parse(&tlvp, (u_int8_t *)msg->l2h + 2,
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msgb_l2len(msg)-2);
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DEBUGP(DMI, "\n");
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if (!TLVP_PRESENT(&tlvp, IPAC_IDTAG_UNIT))
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break;
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/* lookup BTS, create sign_link, ... */
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parse_unitid((char *)TLVP_VAL(&tlvp, IPAC_IDTAG_UNIT),
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&site_id, &bts_id, &trx_id);
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bts = find_bts_by_unitid(e1h->gsmnet, site_id, bts_id);
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if (!bts) {
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DEBUGP(DINP, "Unable to find BTS configuration for "
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" %u/%u/%u, disconnecting\n", site_id, bts_id,
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trx_id);
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return -EIO;
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}
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DEBUGP(DINP, "Identified BTS %u/%u/%u\n", site_id, bts_id, trx_id);
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if (bfd->priv_nr == 1) {
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bts->oml_link = e1inp_sign_link_create(&line->ts[1-1],
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E1INP_SIGN_OML, bts->c0,
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0, 0xff);
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} else if (bfd->priv_nr == 2) {
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struct e1inp_ts *e1i_ts;
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struct bsc_fd *newbfd;
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/* FIXME: implement this for non-0 TRX */
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bfd->data = line = bts->oml_link->ts->line;
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e1i_ts = &line->ts[2-1];
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newbfd = &e1i_ts->driver.ipaccess.fd;
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bts->c0->rsl_link =
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e1inp_sign_link_create(e1i_ts,
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E1INP_SIGN_RSL, bts->c0,
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0, 0);
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/* get rid of our old temporary bfd */
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memcpy(newbfd, bfd, sizeof(*newbfd));
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bsc_unregister_fd(bfd);
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bsc_register_fd(newbfd);
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free(bfd);
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}
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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 = write(bfd->fd, id_ack, sizeof(id_ack));
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break;
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}
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return 0;
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}
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/* FIXME: this is per BTS */
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static int oml_up = 0;
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static int rsl_up = 0;
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static int handle_ts1_read(struct bsc_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 msgb *msg = msgb_alloc(TS1_ALLOC_SIZE);
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struct ipaccess_head *hh;
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int ret;
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if (!msg)
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return -ENOMEM;
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/* first read our 3-byte header */
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hh = (struct ipaccess_head *) msg->data;
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ret = recv(bfd->fd, msg->data, 3, 0);
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if (ret < 0) {
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fprintf(stderr, "recv error %s\n", strerror(errno));
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return ret;
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}
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if (ret == 0) {
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fprintf(stderr, "BTS disappeared, dead socket\n");
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e1inp_event(e1i_ts, EVT_E1_TEI_DN, 0, IPAC_PROTO_RSL);
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e1inp_event(e1i_ts, EVT_E1_TEI_DN, 0, IPAC_PROTO_OML);
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bsc_unregister_fd(bfd);
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close(bfd->fd);
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bfd->fd = -1;
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}
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msgb_put(msg, ret);
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/* then read te length as specified in header */
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msg->l2h = msg->data + sizeof(*hh);
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ret = recv(bfd->fd, msg->l2h, hh->len, 0);
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if (ret < hh->len) {
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fprintf(stderr, "short read!\n");
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msgb_free(msg);
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return -EIO;
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}
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msgb_put(msg, ret);
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DEBUGP(DMI, "RX %u: %s\n", ts_nr, hexdump(msgb_l2(msg), ret));
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if (hh->proto == IPAC_PROTO_IPACCESS) {
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ret = ipaccess_rcvmsg(line, msg, bfd);
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if (ret < 0) {
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e1inp_event(e1i_ts, EVT_E1_TEI_DN, 0, IPAC_PROTO_RSL);
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e1inp_event(e1i_ts, EVT_E1_TEI_DN, 0, IPAC_PROTO_OML);
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bsc_unregister_fd(bfd);
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close(bfd->fd);
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bfd->fd = -1;
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}
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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, 0, hh->proto);
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if (!link) {
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printf("no matching signalling link for 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->trx = link->trx;
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switch (hh->proto) {
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case IPAC_PROTO_RSL:
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if (!rsl_up) {
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e1inp_event(e1i_ts, EVT_E1_TEI_UP, 0, IPAC_PROTO_RSL);
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rsl_up = 1;
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}
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ret = abis_rsl_rcvmsg(msg);
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break;
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case IPAC_PROTO_OML:
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if (!oml_up) {
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e1inp_event(e1i_ts, EVT_E1_TEI_UP, 0, IPAC_PROTO_OML);
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oml_up = 1;
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}
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ret = abis_nm_rcvmsg(msg);
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break;
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default:
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DEBUGP(DMI, "Unknown IP.access protocol proto=0x%02x\n", hh->proto);
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msgb_free(msg);
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break;
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}
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return ret;
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}
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static int handle_ts1_write(struct bsc_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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struct ipaccess_head *hh;
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u_int8_t *l2_data;
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int ret;
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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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bfd->when &= ~BSC_FD_WRITE;
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return 0;
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}
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l2_data = msg->data;
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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->zero = 0;
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hh->len = msg->len - sizeof(*hh);
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switch (sign_link->type) {
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case E1INP_SIGN_OML:
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hh->proto = IPAC_PROTO_OML;
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break;
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case E1INP_SIGN_RSL:
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hh->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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return -EINVAL;
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}
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DEBUGP(DMI, "TX %u: %s\n", ts_nr, hexdump(l2_data, hh->len));
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ret = send(bfd->fd, msg->data, msg->len, 0);
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msgb_free(msg);
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usleep(100000);
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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 bsc_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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fprintf(stderr, "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 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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struct e1inp_driver ipaccess_driver = {
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.name = "ip.access",
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|
.want_write = ts_want_write,
|
||
|
};
|
||
|
|
||
|
/* callback of the OML listening filedescriptor */
|
||
|
static int listen_fd_cb(struct bsc_fd *listen_bfd, unsigned int what)
|
||
|
{
|
||
|
int ret;
|
||
|
int idx = 0;
|
||
|
struct e1inp_line *line;
|
||
|
struct e1inp_ts *e1i_ts;
|
||
|
struct bsc_fd *bfd;
|
||
|
struct sockaddr_in sa;
|
||
|
socklen_t sa_len = sizeof(sa);
|
||
|
|
||
|
if (!(what & BSC_FD_READ))
|
||
|
return 0;
|
||
|
|
||
|
ret = accept(listen_bfd->fd, (struct sockaddr *) &sa, &sa_len);
|
||
|
if (ret < 0) {
|
||
|
perror("accept");
|
||
|
return ret;
|
||
|
}
|
||
|
DEBUGP(DINP, "accept()ed new OML link from %s\n", inet_ntoa(sa.sin_addr));
|
||
|
|
||
|
line = malloc(sizeof(*line));
|
||
|
if (!line) {
|
||
|
close(ret);
|
||
|
return -ENOMEM;
|
||
|
}
|
||
|
memset(line, 0, sizeof(*line));
|
||
|
line->driver = &ipaccess_driver;
|
||
|
//line->driver_data = e1h;
|
||
|
/* create virrtual E1 timeslots for signalling */
|
||
|
e1inp_ts_config(&line->ts[1-1], line, E1INP_TS_TYPE_SIGN);
|
||
|
e1inp_ts_config(&line->ts[2-1], line, E1INP_TS_TYPE_SIGN);
|
||
|
|
||
|
e1i_ts = &line->ts[idx];
|
||
|
|
||
|
bfd = &e1i_ts->driver.ipaccess.fd;
|
||
|
bfd->fd = ret;
|
||
|
bfd->data = line;
|
||
|
bfd->priv_nr = 1;
|
||
|
bfd->cb = ipaccess_fd_cb;
|
||
|
bfd->when = BSC_FD_READ;
|
||
|
ret = bsc_register_fd(bfd);
|
||
|
if (ret < 0) {
|
||
|
fprintf(stderr, "could not register FD\n");
|
||
|
close(bfd->fd);
|
||
|
free(line);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
/* Request ID. FIXME: request LOCATION, HW/SW VErsion, Unit Name, Serno */
|
||
|
ret = write(bfd->fd, id_req, sizeof(id_req));
|
||
|
|
||
|
return e1inp_line_register(line);
|
||
|
}
|
||
|
|
||
|
static int rsl_listen_fd_cb(struct bsc_fd *listen_bfd, unsigned int what)
|
||
|
{
|
||
|
struct sockaddr_in sa;
|
||
|
socklen_t sa_len = sizeof(sa);
|
||
|
struct bsc_fd *bfd = malloc(sizeof(*bfd));
|
||
|
int ret;
|
||
|
|
||
|
if (!(what & BSC_FD_READ))
|
||
|
return 0;
|
||
|
|
||
|
/* Some BTS has connected to us, but we don't know yet which line
|
||
|
* (as created by the OML link) to associate it with. Thus, we
|
||
|
* aloocate a temporary bfd until we have received ID from BTS */
|
||
|
|
||
|
bfd->fd = accept(listen_bfd->fd, (struct sockaddr *) &sa, &sa_len);
|
||
|
if (bfd->fd < 0) {
|
||
|
perror("accept");
|
||
|
return bfd->fd;
|
||
|
}
|
||
|
DEBUGP(DINP, "accept()ed new RSL link from %s\n", inet_ntoa(sa.sin_addr));
|
||
|
bfd->priv_nr = 2;
|
||
|
bfd->cb = ipaccess_fd_cb;
|
||
|
bfd->when = BSC_FD_READ;
|
||
|
ret = bsc_register_fd(bfd);
|
||
|
if (ret < 0) {
|
||
|
fprintf(stderr, "could not register FD\n");
|
||
|
close(bfd->fd);
|
||
|
free(bfd);
|
||
|
return ret;
|
||
|
}
|
||
|
/* Request ID. FIXME: request LOCATION, HW/SW VErsion, Unit Name, Serno */
|
||
|
ret = write(bfd->fd, id_req, sizeof(id_req));
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int make_sock(struct bsc_fd *bfd, u_int16_t port,
|
||
|
int (*cb)(struct bsc_fd *fd, unsigned int what))
|
||
|
{
|
||
|
struct sockaddr_in addr;
|
||
|
int ret, on = 1;
|
||
|
|
||
|
bfd->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
|
||
|
bfd->cb = cb;
|
||
|
bfd->when = BSC_FD_READ;
|
||
|
//bfd->data = line;
|
||
|
|
||
|
memset(&addr, 0, sizeof(addr));
|
||
|
addr.sin_family = AF_INET;
|
||
|
addr.sin_port = htons(port);
|
||
|
addr.sin_addr.s_addr = INADDR_ANY;
|
||
|
|
||
|
setsockopt(bfd->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
|
||
|
|
||
|
ret = bind(bfd->fd, (struct sockaddr *) &addr, sizeof(addr));
|
||
|
if (ret < 0) {
|
||
|
fprintf(stderr, "could not bind l2 socket %s\n",
|
||
|
strerror(errno));
|
||
|
return -EIO;
|
||
|
}
|
||
|
|
||
|
ret = listen(bfd->fd, 1);
|
||
|
if (ret < 0) {
|
||
|
perror("listen");
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
ret = bsc_register_fd(bfd);
|
||
|
if (ret < 0) {
|
||
|
perror("register_listen_fd");
|
||
|
return ret;
|
||
|
}
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/* 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 bsc_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 = 1;
|
||
|
|
||
|
setsockopt(bfd->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
|
||
|
|
||
|
ret = connect(bfd->fd, (struct sockaddr *) sa, sizeof(*sa));
|
||
|
if (ret < 0) {
|
||
|
fprintf(stderr, "could not connect socket\n");
|
||
|
close(bfd->fd);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
ret = bsc_register_fd(bfd);
|
||
|
if (ret < 0) {
|
||
|
close(bfd->fd);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
line->driver = &ipaccess_driver;
|
||
|
|
||
|
return e1inp_line_register(line);
|
||
|
}
|
||
|
|
||
|
int ipaccess_setup(struct gsm_network *gsmnet)
|
||
|
{
|
||
|
int ret;
|
||
|
|
||
|
/* register the driver with the core */
|
||
|
/* FIXME: do this in the plugin initializer function */
|
||
|
ret = e1inp_driver_register(&ipaccess_driver);
|
||
|
if (ret)
|
||
|
return ret;
|
||
|
|
||
|
e1h = malloc(sizeof(*e1h));
|
||
|
memset(e1h, 0, sizeof(*e1h));
|
||
|
e1h->gsmnet = gsmnet;
|
||
|
|
||
|
/* Listen for OML connections */
|
||
|
ret = make_sock(&e1h->listen_fd, 3002, listen_fd_cb);
|
||
|
if (ret < 0)
|
||
|
return ret;
|
||
|
|
||
|
/* Listen for RSL connections */
|
||
|
ret = make_sock(&e1h->rsl_listen_fd, 3003, rsl_listen_fd_cb);
|
||
|
|
||
|
return ret;
|
||
|
}
|