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-rw-r--r--src/misdn.c281
1 files changed, 281 insertions, 0 deletions
diff --git a/src/misdn.c b/src/misdn.c
new file mode 100644
index 00000000..6b232233
--- /dev/null
+++ b/src/misdn.c
@@ -0,0 +1,281 @@
+/* OpenBSC Abis interface to mISDNuser
+ *
+ * (C) 2008 by Harald Welte <laforge@gnumonks.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 <sys/types.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <mISDNif.h>
+
+#define AF_COMPATIBILITY_FUNC
+#include <compat_af_isdn.h>
+
+#define NUM_E1_TS 32
+
+/* data structure for one E1 interface with A-bis */
+struct mi_e1_handle {
+ struct gsm_bts *bts;
+
+ /* The mISDN card number of the card we use */
+ int cardnr;
+
+ /* The RSL adress */
+ struct sockaddr_mISDN l2addr;
+
+ /* The OML adress */
+ struct sockaddr_mISDN omladdr;
+
+ struct gsm_fd fd[NUM_E1_TS];
+};
+
+#define SAPI_L2ML 0
+#define SAPI_OML 62
+#define SAPI_RSL 63
+
+#define TEI_L2ML 127
+#define TEI_OML 25
+#define TEI_RSL 1
+
+static void hexdump(unsigned char *buf, int len)
+{
+ int i;
+ for (i = 0; i < len; i++) {
+ fprintf(stdout, "%02x ", buf[i]);
+ }
+ fprintf(stdout, "\n");
+}
+
+#define TS1_ALLOC_SIZE 300
+
+static int handle_ts1_read(struct bsc_fd *bfd)
+{
+ struct mi_e1_handle *e1h = bfd->data;
+ struct msgb *msg = msgb_alloc(TS1_ALLOC_SIZE);
+ struct sockaddr_mISDN l2dadr;
+ socklen_t alen;
+
+ if (!msg)
+ return -ENOMEM;
+
+ msg->bts = e1h->bts;
+
+ 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);
+
+ switch (hh->prim) {
+ case DL_INFORMATION_IND:
+ DEBUGP(DMI, "got DL_INFORMATION_IND\n");
+ struct sockaddr_mISDN *sa;
+ char *lstr = "UNKN";
+
+ switch (l2addr.tei) {
+ case TEI_OML:
+ sa = &e1h->omladdr;
+ lstr = "OML";
+ break;
+ case TEI_RSL:
+ sa = &e1h->l2addr;
+ lstr = "RSL";
+ break;
+ default:
+ continue;
+ }
+ DEBUGP(DMI, "%s use channel(%d) sapi(%d) tei(%d) for now\n",
+ lstr, l2addr.channel, l2addr.sapi, l2addr.tei);
+ memcpy(sa, &l2addr, sizeof(l2addr));
+ break;
+ case DL_ESTABLISH_IND:
+ DEBUGP(DMI, "got DL_ESTABLISH_IND\n");
+ break;
+ case DL_ESTABLISH_CNF:
+ DEBUGP(DMI, "got DL_ESTABLISH_CNF\n");
+ break;
+ case DL_RELEASE_IND:
+ DEBUGP(DMI, "got DL_RELEASE_IND\n");
+ break;
+ case MPH_ACTIVATE_IND:
+ DEBUGP(DMI, "got MPH_ACTIVATE_IND\n");
+ break;
+ case MPH_DEACTIVATE_IND:
+ DEBUGP(DMI, "got MPH_DEACTIVATE_IND\n");
+ break;
+ case DL_DATA_IND:
+ DEBUGP(DMI, "got DL_DATA_IND\n");
+ msg->l2_off = MISDN_HEADER_LEN;
+ hexdump(msgb_l2(msg), ret - MISDN_HEADER_LEN);
+ switch (l2addr.tei) {
+ case TEI_OML:
+ ret = abis_nm_rcvmsg(msg);
+ break;
+ case TEI_RSL:
+ ret = abis_rsl_rcvmsg(msg);
+ break;
+ default:
+ fprintf(stderr, "DATA_IND for unknown TEI\n");
+ break;
+ }
+ break;
+ default:
+ DEBUGP(DMI, "got unexpected 0x%x prim\n", hh->prim);
+ break;
+ }
+ return ret;
+}
+
+static int handle_ts1_write(struct bsc_fd *bfd)
+{
+ struct mi_e1_handle *e1h = bfd->data;
+
+ /* FIXME: dequeue a pending msgb for RSL / OML */
+
+ /* prepend the mISDNhead */
+ hh = (struct mISDNhed *) msg_
+ hh->prim = DL_DATA_REQ;
+
+ /* FIXME: send it off */
+}
+
+static int handle_tsX_read(struct bsc_fd *bfd)
+{
+ /* FIXME: read from a B channel TS */
+}
+
+static int handle_TsX_write(struct bsc_fd *bfd)
+{
+ /* FIXME: write to a B channel TS */
+}
+
+/* callback from select.c in case one of the fd's can be read/written */
+static int misdn_fd_cb(struct gsm_fd *bfd, unsigned int what)
+{
+ unsigned int e1_ts = bfd->priv_nr;
+ int rc = 0;
+
+ switch (e1_ts) {
+ case 1:
+ if (what & BSC_FD_READ)
+ rc = handle_ts1_read(bfd);
+ if (what & BSC_FD_WRITE)
+ rc = handle_ts1_write(bfd);
+ break;
+ default:
+ if (what & BSC_FD_READ)
+ rc = handle_tsX_read(bfd);
+ if (what & BSC_FD_WRITE)
+ rc = handle_tsX_write(bfd);
+ break;
+ }
+
+ return rc;
+}
+
+static int mi_setup(devinfo_t *di)
+{
+ int ts, sk, ret;
+ struct mISDN_devinfo devinfo;
+
+ 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");
+#if 0
+ devinfo.id = di->cardnr;
+ ret = ioctl(sk, IMGETDEVINFO, &devinfo);
+ if (ret < 0) {
+ fprintf(stdout, "error getting info for device %d: %s\n",
+ di->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
+
+ /* TS0 is CRC4, don't need any fd for it */
+ for (ts = 1; ts < NUM_E1_TS; ts++) {
+ unsigned int idx = i-1;
+ struct bsc_fd *bfd = &e1h->fd[idx];
+ struct sockaddr_mISDN addr;
+
+ if (ts == 1)
+ bfd->fd = socket(PF_ISDN, SOCK_RAW, ISDN_P_LAPD_NT);
+ else
+ bfd->fd = socket(PF_ISDN, SOCK_DGRAM, ISDN_P_B_RAW);
+
+ 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;
+ if (ts == 1) {
+ addr.channel = 0;
+ addr.sapi = 0;/* SAPI not supported yet in kernel */
+ addr.tei = TEI_L2ML;
+ } else
+ addr.channel = ts;
+
+ ret = bind(bfd->fd, (struct sockaddr *) &addr, sizeof(addr));
+ if (ret < 0) {
+ fprintf(stdout, "could not bind l2 socket %s\n",
+ strerror(errno));
+ return -EIO;
+ }
+ }
+}
+