* add trau_mux implementation to relay from one incoming TRAU
channel to another one (simple voice call switching)
* add a way more generic E1 input layer, abstracting out the misdn
low-level interface. This also adds infrastructure for multiple TRX
in one BTS, as well as multiple BTS on one E1 link
* add a E1 subchannel multiplexer for sending multiple 16kbit sub-channels
one one 64kBps E1 channel
* add TRAU IDLE frame generation
* terminate bsc_hack in case there is a E1 / mISDN init error
* introduce 'e1_config.c' file with static configuration of our
E1 setup (which TRX/BTS is configured for which TEI/SAPI/E1). This should
later become a config file rather than a compiled C file.
WARNING: all this compiles but is not tested yet. Expect fix-up committs over
the next hours or so
diff --git a/src/input/misdn.c b/src/input/misdn.c
new file mode 100644
index 0000000..8201293
--- /dev/null
+++ b/src/input/misdn.c
@@ -0,0 +1,483 @@
+/* OpenBSC Abis input driver for mISDNuser */
+
+/* (C) 2008-2009 by Harald Welte <laforge@gnumonks.org>
+ * (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <time.h>
+#include <sys/fcntl.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <arpa/inet.h>
+#include <mISDNif.h>
+
+//#define AF_COMPATIBILITY_FUNC
+//#include <compat_af_isdn.h>
+#define AF_ISDN 34
+#define PF_ISDN AF_ISDN
+
+#include <openbsc/select.h>
+#include <openbsc/msgb.h>
+#include <openbsc/debug.h>
+#include <openbsc/gsm_data.h>
+#include <openbsc/abis_nm.h>
+#include <openbsc/abis_rsl.h>
+#include <openbsc/subchan_demux.h>
+#include <openbsc/e1_input.h>
+
+/* data structure for one E1 interface with A-bis */
+struct mi_e1_handle {
+ /* The mISDN card number of the card we use */
+ int cardnr;
+};
+
+#define TS1_ALLOC_SIZE 300
+
+struct prim_name {
+ unsigned int prim;
+ const char *name;
+};
+
+const struct prim_name prim_names[] = {
+ { DL_ESTABLISH_IND, "DL_ESTABLISH_IND" },
+ { DL_ESTABLISH_CNF, "DL_ESTABLISH_CNF" },
+ { DL_RELEASE_IND, "DL_RELEASE_IND" },
+ { DL_RELEASE_CNF, "DL_RELEASE_CNF" },
+ { DL_DATA_IND, "DL_DATA_IND" },
+ { DL_UNITDATA_IND, "DL_UNITDATA_IND" },
+ { DL_INFORMATION_IND, "DL_INFORMATION_IND" },
+ { MPH_ACTIVATE_IND, "MPH_ACTIVATE_IND" },
+ { MPH_DEACTIVATE_IND, "MPH_DEACTIVATE_IND" },
+};
+
+const char *get_prim_name(unsigned int prim)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(prim_names); i++) {
+ if (prim_names[i].prim == prim)
+ return prim_names[i].name;
+ }
+
+ return "UNKNOWN";
+}
+
+static int handle_ts1_read(struct bsc_fd *bfd)
+{
+ struct e1inp_line *line = bfd->data;
+ unsigned int ts_nr = bfd->priv_nr;
+ struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1];
+ struct e1inp_sign_link *link;
+ struct msgb *msg = msgb_alloc(TS1_ALLOC_SIZE);
+ struct sockaddr_mISDN l2addr;
+ struct mISDNhead *hh;
+ socklen_t alen;
+ int ret;
+
+ if (!msg)
+ return -ENOMEM;
+
+ hh = (struct mISDNhead *) msg->data;
+
+ alen = sizeof(l2addr);
+ ret = recvfrom(bfd->fd, msg->data, 300, 0,
+ (struct sockaddr *) &l2addr, &alen);
+ if (ret < 0) {
+ fprintf(stderr, "recvfrom error %s\n", strerror(errno));
+ return ret;
+ }
+
+ if (alen != sizeof(l2addr))
+ return -EINVAL;
+
+ msgb_put(msg, ret);
+
+ DEBUGP(DMI, "alen =%d, dev(%d) channel(%d) sapi(%d) tei(%d)\n",
+ alen, l2addr.dev, l2addr.channel, l2addr.sapi, l2addr.tei);
+
+ DEBUGP(DMI, "<= len = %d, prim(0x%x) id(0x%x)\n",
+ ret, hh->prim, hh->id);
+
+ DEBUGP(DMI, "got %s:\n", get_prim_name(hh->prim));
+
+ switch (hh->prim) {
+ case DL_INFORMATION_IND:
+ /* mISDN tells us which channel number is allocated for this
+ * tuple of (SAPI, TEI). */
+ DEBUGP(DMI, "use channel(%d) sapi(%d) tei(%d) for now\n",
+ l2addr.channel, l2addr.sapi, l2addr.tei);
+ link = e1inp_lookup_sign_link(e1i_ts, l2addr.tei, l2addr.sapi);
+ if (!link) {
+ DEBUGPC(DMI, "mISDN message for unknown sign_link\n");
+ free(msg);
+ return -EINVAL;
+ }
+ /* save the channel number in the driver private struct */
+ link->driver.misdn.channel = l2addr.channel;
+ break;
+ case MPH_ACTIVATE_IND:
+ ret = e1inp_event(e1i_ts, EVT_E1_TEI_UP, l2addr.tei, l2addr.sapi);
+ break;
+ case MPH_DEACTIVATE_IND:
+ ret = e1inp_event(e1i_ts, EVT_E1_TEI_DN, l2addr.tei, l2addr.sapi);
+ break;
+ case DL_DATA_IND:
+ DEBUGP(DMI, "got DL_DATA_IND\n");
+ msg->l2h = msg->data + MISDN_HEADER_LEN;
+ if (debug_mask & DMI) {
+ fprintf(stdout, "RX: ");
+ hexdump(msgb_l2(msg), ret - MISDN_HEADER_LEN);
+ }
+ ret = e1inp_rx_ts(e1i_ts, msg, l2addr.tei, l2addr.sapi);
+ break;
+ default:
+ break;
+ }
+ return ret;
+}
+
+static int handle_ts1_write(struct bsc_fd *bfd)
+{
+ struct e1inp_line *line = bfd->data;
+ unsigned int ts_nr = bfd->priv_nr;
+ struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1];
+ struct e1inp_sign_link *sign_link;
+ struct sockaddr_mISDN sa;
+ struct msgb *msg;
+ struct mISDNhead *hh;
+ u_int8_t *l2_data;
+ int ret;
+
+ /* get the next msg for this timeslot */
+ msg = e1inp_tx_ts(e1i_ts, &sign_link);
+ if (!msg) {
+ bfd->when &= ~BSC_FD_WRITE;
+ return 0;
+ }
+
+ l2_data = msg->data;
+
+ /* prepend the mISDNhead */
+ hh = (struct mISDNhead *) msgb_push(msg, sizeof(*hh));
+ hh->prim = DL_DATA_REQ;
+
+ if (debug_mask & DMI) {
+ fprintf(stdout, "TX: ");
+ hexdump(l2_data, msg->len - MISDN_HEADER_LEN);
+ }
+
+ /* construct the sockaddr */
+ sa.family = AF_ISDN;
+ sa.sapi = sign_link->sapi;
+ sa.dev = sign_link->tei;
+ sa.channel = sign_link->driver.misdn.channel;
+
+ ret = sendto(bfd->fd, msg->data, msg->len, 0,
+ (struct sockaddr *)&sa, sizeof(sa));
+ msgb_free(msg);
+
+ /* FIXME: this has to go */
+ usleep(100000);
+
+ return ret;
+}
+
+#define TSX_ALLOC_SIZE 4096
+
+/* FIXME: read from a B channel TS */
+static int handle_tsX_read(struct bsc_fd *bfd)
+{
+ struct e1inp_line *line = bfd->data;
+ unsigned int ts_nr = bfd->priv_nr;
+ struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1];
+ struct msgb *msg = msgb_alloc(TSX_ALLOC_SIZE);
+ struct mISDNhead *hh;
+ int ret;
+
+ if (!msg)
+ return -ENOMEM;
+
+ hh = (struct mISDNhead *) msg->data;
+
+ ret = recv(bfd->fd, msg->data, TSX_ALLOC_SIZE, 0);
+ if (ret < 0) {
+ fprintf(stderr, "recvfrom error %s\n", strerror(errno));
+ return ret;
+ }
+
+ msgb_put(msg, ret);
+
+ DEBUGP(DMIB, "<= BCHAN len = %d, prim(0x%x) id(0x%x): %s\n",
+ ret, hh->prim, hh->id, get_prim_name(hh->prim));
+
+ switch (hh->prim) {
+ case PH_DATA_IND:
+ msg->l2h = msg->data + MISDN_HEADER_LEN;
+ if (debug_mask & DMIB) {
+ fprintf(stdout, "BCHAN RX: ");
+ hexdump(msgb_l2(msg), ret - MISDN_HEADER_LEN);
+ }
+ ret = e1inp_rx_ts(e1i_ts, msg, 0, 0);
+ break;
+ default:
+ break;
+ }
+ /* FIXME: why do we free signalling msgs in the caller, and trau not? */
+ msgb_free(msg);
+
+ return ret;
+}
+
+#define BCHAN_TX_GRAN 40
+/* write to a B channel TS */
+static int handle_tsX_write(struct bsc_fd *bfd)
+{
+ struct e1inp_line *line = bfd->data;
+ unsigned int ts_nr = bfd->priv_nr;
+ struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1];
+ struct mISDNhead *hh;
+ u_int8_t tx_buf[BCHAN_TX_GRAN + sizeof(*hh)];
+ struct subch_mux *mx = &e1i_ts->trau.mux;
+ int ret;
+
+ hh = (struct mISDNhead *) tx_buf;
+ hh->prim = PH_DATA_REQ;
+
+ subchan_mux_out(mx, tx_buf+sizeof(*hh), BCHAN_TX_GRAN);
+
+ ret = send(bfd->fd, tx_buf, sizeof(*hh) + BCHAN_TX_GRAN, 0);
+ if (ret < sizeof(*hh) + BCHAN_TX_GRAN)
+ DEBUGP(DMIB, "send returns %d instead of %u\n", ret,
+ sizeof(*hh) + BCHAN_TX_GRAN);
+
+ return ret;
+}
+
+/* callback from select.c in case one of the fd's can be read/written */
+static int misdn_fd_cb(struct bsc_fd *bfd, unsigned int what)
+{
+ struct e1inp_line *line = bfd->data;
+ unsigned int ts_nr = bfd->priv_nr;
+ unsigned int idx = ts_nr-1;
+ struct e1inp_ts *e1i_ts = &line->ts[idx];
+ int rc = 0;
+
+ switch (e1i_ts->type) {
+ case E1INP_TS_TYPE_SIGN:
+ if (what & BSC_FD_READ)
+ rc = handle_ts1_read(bfd);
+ if (what & BSC_FD_WRITE)
+ rc = handle_ts1_write(bfd);
+ break;
+ case E1INP_TS_TYPE_TRAU:
+ if (what & BSC_FD_READ)
+ rc = handle_tsX_read(bfd);
+ if (what & BSC_FD_WRITE)
+ rc = handle_tsX_write(bfd);
+ break;
+ default:
+ fprintf(stderr, "unknown E1 TS type %u\n", e1i_ts->type);
+ break;
+ }
+
+ return rc;
+}
+
+static int activate_bchan(struct e1inp_line *line, int ts, int act)
+{
+ struct mISDNhead hh;
+ int ret;
+ unsigned int idx = ts-1;
+ struct e1inp_ts *e1i_ts = &line->ts[idx];
+ struct bsc_fd *bfd = &e1i_ts->driver.misdn.fd;
+
+ fprintf(stdout, "activate bchan\n");
+ if (act)
+ hh.prim = PH_ACTIVATE_REQ;
+ else
+ hh.prim = PH_DEACTIVATE_REQ;
+
+ hh.id = MISDN_ID_ANY;
+ ret = sendto(bfd->fd, &hh, sizeof(hh), 0, NULL, 0);
+ if (ret < 0) {
+ fprintf(stdout, "could not send ACTIVATE_RQ %s\n",
+ strerror(errno));
+ }
+
+ return ret;
+}
+
+static int ts_want_write(struct e1inp_ts *e1i_ts)
+{
+ e1i_ts->driver.misdn.fd.when |= BSC_FD_WRITE;
+
+ return 0;
+}
+
+struct e1inp_driver misdn_driver = {
+ .name = "mISDNuser",
+ .want_write = ts_want_write,
+};
+
+static int mi_e1_setup(struct e1inp_line *line)
+{
+ struct mi_e1_handle *e1h = line->driver_data;
+ int ts, ret;
+
+ /* TS0 is CRC4, don't need any fd for it */
+ for (ts = 1; ts < NUM_E1_TS; ts++) {
+ unsigned int idx = ts-1;
+ struct e1inp_ts *e1i_ts = &line->ts[idx];
+ struct bsc_fd *bfd = &e1i_ts->driver.misdn.fd;
+ struct sockaddr_mISDN addr;
+
+ bfd->data = line;
+ bfd->priv_nr = ts;
+ bfd->cb = misdn_fd_cb;
+
+ switch (e1i_ts->type) {
+ case E1INP_TS_TYPE_NONE:
+ continue;
+ break;
+ case E1INP_TS_TYPE_SIGN:
+ bfd->fd = socket(PF_ISDN, SOCK_DGRAM, ISDN_P_LAPD_NT);
+ bfd->when = BSC_FD_READ;
+ break;
+ case E1INP_TS_TYPE_TRAU:
+ bfd->fd = socket(PF_ISDN, SOCK_DGRAM, ISDN_P_B_RAW);
+ bfd->when = BSC_FD_READ | BSC_FD_WRITE;
+ break;
+ }
+
+ if (bfd->fd < 0) {
+ fprintf(stderr, "could not open socket %s\n",
+ strerror(errno));
+ return bfd->fd;
+ }
+
+ memset(&addr, 0, sizeof(addr));
+ addr.family = AF_ISDN;
+ addr.dev = e1h->cardnr;
+ switch (e1i_ts->type) {
+ case E1INP_TS_TYPE_SIGN:
+ addr.channel = 0;
+ /* SAPI not supported yet in kernel */
+ //addr.sapi = e1inp_ts->sign.sapi;
+ addr.sapi = 0;
+ addr.tei = GROUP_TEI;
+ break;
+ case E1INP_TS_TYPE_TRAU:
+ addr.channel = ts;
+ break;
+ default:
+ DEBUGP(DMI, "unsupported E1 TS type: %u\n",
+ e1i_ts->type);
+ break;
+ }
+
+ 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;
+ }
+
+ /* FIXME: only activate B-Channels once we start to
+ * use them to conserve CPU power */
+ if (e1i_ts->type == E1INP_TS_TYPE_TRAU)
+ activate_bchan(line, ts, 1);
+
+ ret = bsc_register_fd(bfd);
+ if (ret < 0) {
+ fprintf(stderr, "could not register FD: %s\n",
+ strerror(ret));
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+int mi_setup(int cardnr, struct e1inp_line *line)
+{
+ struct mi_e1_handle *e1h;
+ int sk, ret, cnt;
+ struct mISDN_devinfo devinfo;
+
+ /* register the driver with the core */
+ /* FIXME: do this in the plugin initializer function */
+ ret = e1inp_driver_register(&misdn_driver);
+ if (ret)
+ return ret;
+
+ /* create the actual line instance */
+ /* FIXME: do this independent of driver registration */
+ e1h = malloc(sizeof(*e1h));
+ memset(e1h, 0, sizeof(*e1h));
+
+ e1h->cardnr = cardnr;
+
+ line->driver = &misdn_driver;
+ line->driver_data = e1h;
+
+ /* open the ISDN card device */
+ sk = socket(PF_ISDN, SOCK_RAW, ISDN_P_BASE);
+ if (sk < 0) {
+ fprintf(stderr, "could not open socket %s\n", strerror(errno));
+ return sk;
+ }
+
+ ret = ioctl(sk, IMGETCOUNT, &cnt);
+ if (ret) {
+ fprintf(stderr, "error getting interf count: %s\n",
+ strerror(errno));
+ close(sk);
+ return -ENODEV;
+ }
+ //DEBUGP(DMI,"%d device%s found\n", cnt, (cnt==1)?"":"s");
+ printf("%d device%s found\n", cnt, (cnt==1)?"":"s");
+#if 1
+ devinfo.id = e1h->cardnr;
+ ret = ioctl(sk, IMGETDEVINFO, &devinfo);
+ if (ret < 0) {
+ fprintf(stdout, "error getting info for device %d: %s\n",
+ e1h->cardnr, strerror(errno));
+ return -ENODEV;
+ }
+ fprintf(stdout, " id: %d\n", devinfo.id);
+ fprintf(stdout, " Dprotocols: %08x\n", devinfo.Dprotocols);
+ fprintf(stdout, " Bprotocols: %08x\n", devinfo.Bprotocols);
+ fprintf(stdout, " protocol: %d\n", devinfo.protocol);
+ fprintf(stdout, " nrbchan: %d\n", devinfo.nrbchan);
+ fprintf(stdout, " name: %s\n", devinfo.name);
+#endif
+
+ ret = mi_e1_setup(line);
+ if (ret)
+ return ret;
+
+ return e1inp_line_register(line);
+}