mirror of https://gerrit.osmocom.org/libosmocore
201 lines
4.6 KiB
C
201 lines
4.6 KiB
C
/* GSMTAP output for Osmocom Layer2 (will only work on the host PC) */
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/*
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* (C) 2010 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 "../config.h"
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#ifdef HAVE_SYS_SELECT_H
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#include <osmocore/gsmtap_util.h>
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#include <osmocore/logging.h>
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#include <osmocore/protocol/gsm_04_08.h>
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#include <osmocore/gsmtap.h>
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#include <osmocore/msgb.h>
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#include <osmocore/rsl.h>
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#include <osmocore/select.h>
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#include <arpa/inet.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <stdint.h>
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#include <string.h>
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#include <errno.h>
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static struct bsc_fd gsmtap_bfd = { .fd = -1 };
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static LLIST_HEAD(gsmtap_txqueue);
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uint8_t chantype_rsl2gsmtap(uint8_t rsl_chantype, uint8_t link_id)
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{
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uint8_t ret = GSMTAP_CHANNEL_UNKNOWN;
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switch (rsl_chantype) {
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case RSL_CHAN_Bm_ACCHs:
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ret = GSMTAP_CHANNEL_TCH_F;
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break;
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case RSL_CHAN_Lm_ACCHs:
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ret = GSMTAP_CHANNEL_TCH_H;
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break;
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case RSL_CHAN_SDCCH4_ACCH:
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ret = GSMTAP_CHANNEL_SDCCH4;
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break;
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case RSL_CHAN_SDCCH8_ACCH:
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ret = GSMTAP_CHANNEL_SDCCH8;
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break;
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case RSL_CHAN_BCCH:
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ret = GSMTAP_CHANNEL_BCCH;
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break;
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case RSL_CHAN_RACH:
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ret = GSMTAP_CHANNEL_RACH;
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break;
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case RSL_CHAN_PCH_AGCH:
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/* it could also be AGCH... */
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ret = GSMTAP_CHANNEL_PCH;
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break;
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}
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if (link_id & 0x40)
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ret |= GSMTAP_CHANNEL_ACCH;
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return ret;
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}
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/* receive a message from L1/L2 and put it in GSMTAP */
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struct msgb *gsmtap_makemsg(uint16_t arfcn, uint8_t ts, uint8_t chan_type,
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uint8_t ss, uint32_t fn, int8_t signal_dbm,
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uint8_t snr, const uint8_t *data, unsigned int len)
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{
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struct msgb *msg;
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struct gsmtap_hdr *gh;
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uint8_t *dst;
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msg = msgb_alloc(sizeof(*gh) + len, "gsmtap_tx");
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if (!msg)
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return NULL;
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gh = (struct gsmtap_hdr *) msgb_put(msg, sizeof(*gh));
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gh->version = GSMTAP_VERSION;
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gh->hdr_len = sizeof(*gh)/4;
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gh->type = GSMTAP_TYPE_UM;
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gh->timeslot = ts;
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gh->sub_slot = ss;
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gh->arfcn = htons(arfcn);
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gh->snr_db = snr;
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gh->signal_dbm = signal_dbm;
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gh->frame_number = htonl(fn);
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gh->sub_type = chan_type;
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gh->antenna_nr = 0;
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dst = msgb_put(msg, len);
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memcpy(dst, data, len);
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return msg;
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}
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/* receive a message from L1/L2 and put it in GSMTAP */
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int gsmtap_sendmsg(uint16_t arfcn, uint8_t ts, uint8_t chan_type, uint8_t ss,
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uint32_t fn, int8_t signal_dbm, uint8_t snr,
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const uint8_t *data, unsigned int len)
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{
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struct msgb *msg;
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/* gsmtap was never initialized, so don't try to send anything */
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if (gsmtap_bfd.fd == -1)
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return 0;
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msg = gsmtap_makemsg(arfcn, ts, chan_type, ss, fn, signal_dbm,
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snr, data, len);
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if (!msg)
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return -ENOMEM;
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msgb_enqueue(&gsmtap_txqueue, msg);
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gsmtap_bfd.when |= BSC_FD_WRITE;
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return 0;
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}
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/* Callback from select layer if we can write to the socket */
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static int gsmtap_fd_cb(struct bsc_fd *fd, unsigned int flags)
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{
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struct msgb *msg;
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int rc;
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if (!(flags & BSC_FD_WRITE))
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return 0;
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msg = msgb_dequeue(&gsmtap_txqueue);
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if (!msg) {
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/* no more messages in the queue, disable READ cb */
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gsmtap_bfd.when = 0;
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return 0;
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}
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rc = write(gsmtap_bfd.fd, msg->data, msg->len);
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if (rc < 0) {
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perror("writing msgb to gsmtap fd");
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msgb_free(msg);
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return rc;
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}
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if (rc != msg->len) {
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perror("short write to gsmtap fd");
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msgb_free(msg);
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return -EIO;
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}
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msgb_free(msg);
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return 0;
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}
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int gsmtap_init(uint32_t dst_ip)
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{
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int rc;
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struct sockaddr_in sin;
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sin.sin_family = AF_INET;
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sin.sin_port = htons(GSMTAP_UDP_PORT);
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sin.sin_addr.s_addr = htonl(dst_ip);
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/* FIXME: create socket */
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rc = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
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if (rc < 0) {
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perror("creating UDP socket");
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return rc;
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}
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gsmtap_bfd.fd = rc;
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rc = connect(rc, (struct sockaddr *)&sin, sizeof(sin));
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if (rc < 0) {
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perror("connecting UDP socket");
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close(gsmtap_bfd.fd);
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gsmtap_bfd.fd = 0;
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return rc;
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}
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gsmtap_bfd.when = BSC_FD_WRITE;
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gsmtap_bfd.cb = gsmtap_fd_cb;
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gsmtap_bfd.data = NULL;
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return bsc_register_fd(&gsmtap_bfd);
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}
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#endif /* HAVE_SYS_SELECT_H */
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