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-rw-r--r--openbsc/src/input/ipaccess.c597
1 files changed, 597 insertions, 0 deletions
diff --git a/openbsc/src/input/ipaccess.c b/openbsc/src/input/ipaccess.c
new file mode 100644
index 000000000..ea7f847c2
--- /dev/null
+++ b/openbsc/src/input/ipaccess.c
@@ -0,0 +1,597 @@
+/* OpenBSC Abis input driver for ip.access */
+
+/* (C) 2009 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 <time.h>
+#include <sys/fcntl.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <arpa/inet.h>
+
+#include <openbsc/select.h>
+#include <openbsc/tlv.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>
+#include <openbsc/ipaccess.h>
+
+/* data structure for one E1 interface with A-bis */
+struct ia_e1_handle {
+ struct bsc_fd listen_fd;
+ struct bsc_fd rsl_listen_fd;
+ struct gsm_network *gsmnet;
+};
+
+static struct ia_e1_handle *e1h;
+
+
+#define TS1_ALLOC_SIZE 300
+
+static const u_int8_t pong[] = { 0, 1, IPAC_PROTO_IPACCESS, IPAC_MSGT_PONG };
+static const u_int8_t id_ack[] = { 0, 1, IPAC_PROTO_IPACCESS, IPAC_MSGT_ID_ACK };
+static const u_int8_t id_req[] = { 0, 17, IPAC_PROTO_IPACCESS, IPAC_MSGT_ID_GET,
+ 0x01, IPAC_IDTAG_UNIT,
+ 0x01, IPAC_IDTAG_MACADDR,
+ 0x01, IPAC_IDTAG_LOCATION1,
+ 0x01, IPAC_IDTAG_LOCATION2,
+ 0x01, IPAC_IDTAG_EQUIPVERS,
+ 0x01, IPAC_IDTAG_SWVERSION,
+ 0x01, IPAC_IDTAG_UNITNAME,
+ 0x01, IPAC_IDTAG_SERNR,
+ };
+
+static const char *idtag_names[] = {
+ [IPAC_IDTAG_SERNR] = "Serial_Number",
+ [IPAC_IDTAG_UNITNAME] = "Unit_Name",
+ [IPAC_IDTAG_LOCATION1] = "Location_1",
+ [IPAC_IDTAG_LOCATION2] = "Location_2",
+ [IPAC_IDTAG_EQUIPVERS] = "Equipment_Version",
+ [IPAC_IDTAG_SWVERSION] = "Software_Version",
+ [IPAC_IDTAG_IPADDR] = "IP_Address",
+ [IPAC_IDTAG_MACADDR] = "MAC_Address",
+ [IPAC_IDTAG_UNIT] = "Unit_ID",
+};
+
+static const char *ipac_idtag_name(int tag)
+{
+ if (tag >= ARRAY_SIZE(idtag_names))
+ return "unknown";
+
+ return idtag_names[tag];
+}
+
+static int ipac_idtag_parse(struct tlv_parsed *dec, unsigned char *buf, int len)
+{
+ u_int8_t t_len;
+ u_int8_t t_tag;
+ u_int8_t *cur = buf;
+
+ while (cur < buf + len) {
+ t_len = *cur++;
+ t_tag = *cur++;
+
+ DEBUGPC(DMI, "%s='%s' ", ipac_idtag_name(t_tag), cur);
+
+ dec->lv[t_tag].len = t_len;
+ dec->lv[t_tag].val = cur;
+
+ cur += t_len;
+ }
+ return 0;
+}
+
+struct gsm_bts *find_bts_by_unitid(struct gsm_network *net,
+ u_int16_t site_id, u_int16_t bts_id)
+{
+ int i;
+
+ for (i = 0; i < net->num_bts; i++) {
+ struct gsm_bts *bts = &net->bts[i];
+
+ if (!is_ipaccess_bts(bts))
+ continue;
+
+ if (bts->ip_access.site_id == site_id &&
+ bts->ip_access.bts_id == bts_id)
+ return bts;
+ }
+
+ return NULL;
+}
+
+static int parse_unitid(const char *str, u_int16_t *site_id, u_int16_t *bts_id,
+ u_int16_t *trx_id)
+{
+ unsigned long ul;
+ char *endptr;
+ const char *nptr;
+
+ nptr = str;
+ ul = strtoul(nptr, &endptr, 10);
+ if (endptr <= nptr)
+ return -EINVAL;
+ if (site_id)
+ *site_id = ul & 0xffff;
+
+ if (*endptr++ != '/')
+ return -EINVAL;
+
+ nptr = endptr;
+ ul = strtoul(nptr, &endptr, 10);
+ if (endptr <= nptr)
+ return -EINVAL;
+ if (bts_id)
+ *bts_id = ul & 0xffff;
+
+ if (*endptr++ != '/')
+ return -EINVAL;
+
+ nptr = endptr;
+ ul = strtoul(nptr, &endptr, 10);
+ if (endptr <= nptr)
+ return -EINVAL;
+ if (trx_id)
+ *trx_id = ul & 0xffff;
+
+ return 0;
+}
+
+static int ipaccess_rcvmsg(struct e1inp_line *line, struct msgb *msg,
+ struct bsc_fd *bfd)
+{
+ struct tlv_parsed tlvp;
+ u_int8_t msg_type = *(msg->l2h);
+ u_int16_t site_id, bts_id, trx_id;
+ struct gsm_bts *bts;
+ int ret = 0;
+
+ switch (msg_type) {
+ case IPAC_MSGT_PING:
+ ret = write(bfd->fd, pong, sizeof(pong));
+ break;
+ case IPAC_MSGT_PONG:
+ DEBUGP(DMI, "PONG!\n");
+ break;
+ case IPAC_MSGT_ID_RESP:
+ DEBUGP(DMI, "ID_RESP ");
+ /* parse tags, search for Unit ID */
+ ipac_idtag_parse(&tlvp, (u_int8_t *)msg->l2h + 2,
+ msgb_l2len(msg)-2);
+ DEBUGP(DMI, "\n");
+
+ if (!TLVP_PRESENT(&tlvp, IPAC_IDTAG_UNIT))
+ break;
+
+ /* lookup BTS, create sign_link, ... */
+ parse_unitid((char *)TLVP_VAL(&tlvp, IPAC_IDTAG_UNIT),
+ &site_id, &bts_id, &trx_id);
+ bts = find_bts_by_unitid(e1h->gsmnet, site_id, bts_id);
+ if (!bts) {
+ DEBUGP(DINP, "Unable to find BTS configuration for "
+ " %u/%u/%u, disconnecting\n", site_id, bts_id,
+ trx_id);
+ return -EIO;
+ }
+ DEBUGP(DINP, "Identified BTS %u/%u/%u\n", site_id, bts_id, trx_id);
+ if (bfd->priv_nr == 1) {
+ bts->oml_link = e1inp_sign_link_create(&line->ts[1-1],
+ E1INP_SIGN_OML, bts->c0,
+ 0, 0xff);
+ } else if (bfd->priv_nr == 2) {
+ struct e1inp_ts *e1i_ts;
+ struct bsc_fd *newbfd;
+
+ /* FIXME: implement this for non-0 TRX */
+ bfd->data = line = bts->oml_link->ts->line;
+ e1i_ts = &line->ts[2-1];
+ newbfd = &e1i_ts->driver.ipaccess.fd;
+
+ bts->c0->rsl_link =
+ e1inp_sign_link_create(e1i_ts,
+ E1INP_SIGN_RSL, bts->c0,
+ 0, 0);
+ /* get rid of our old temporary bfd */
+ memcpy(newbfd, bfd, sizeof(*newbfd));
+ bsc_unregister_fd(bfd);
+ bsc_register_fd(newbfd);
+ free(bfd);
+ }
+ break;
+ case IPAC_MSGT_ID_ACK:
+ DEBUGP(DMI, "ID_ACK? -> ACK!\n");
+ ret = write(bfd->fd, id_ack, sizeof(id_ack));
+ break;
+ }
+ return 0;
+}
+
+/* FIXME: this is per BTS */
+static int oml_up = 0;
+static int rsl_up = 0;
+
+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 ipaccess_head *hh;
+ int ret;
+
+ if (!msg)
+ return -ENOMEM;
+
+ /* first read our 3-byte header */
+ hh = (struct ipaccess_head *) msg->data;
+ ret = recv(bfd->fd, msg->data, 3, 0);
+ if (ret < 0) {
+ fprintf(stderr, "recv error %s\n", strerror(errno));
+ return ret;
+ }
+ if (ret == 0) {
+ fprintf(stderr, "BTS disappeared, dead socket\n");
+ e1inp_event(e1i_ts, EVT_E1_TEI_DN, 0, IPAC_PROTO_RSL);
+ e1inp_event(e1i_ts, EVT_E1_TEI_DN, 0, IPAC_PROTO_OML);
+ bsc_unregister_fd(bfd);
+ close(bfd->fd);
+ bfd->fd = -1;
+ }
+ msgb_put(msg, ret);
+
+ /* then read te length as specified in header */
+ msg->l2h = msg->data + sizeof(*hh);
+ ret = recv(bfd->fd, msg->l2h, hh->len, 0);
+ if (ret < hh->len) {
+ fprintf(stderr, "short read!\n");
+ msgb_free(msg);
+ return -EIO;
+ }
+ msgb_put(msg, ret);
+ DEBUGP(DMI, "RX %u: %s\n", ts_nr, hexdump(msgb_l2(msg), ret));
+
+ if (hh->proto == IPAC_PROTO_IPACCESS) {
+ ret = ipaccess_rcvmsg(line, msg, bfd);
+ if (ret < 0) {
+ e1inp_event(e1i_ts, EVT_E1_TEI_DN, 0, IPAC_PROTO_RSL);
+ e1inp_event(e1i_ts, EVT_E1_TEI_DN, 0, IPAC_PROTO_OML);
+ bsc_unregister_fd(bfd);
+ close(bfd->fd);
+ bfd->fd = -1;
+ }
+ msgb_free(msg);
+ return ret;
+ }
+ /* BIG FAT WARNING: bfd might no longer exist here, since ipaccess_rcvmsg()
+ * might have free'd it !!! */
+
+ link = e1inp_lookup_sign_link(e1i_ts, 0, hh->proto);
+ if (!link) {
+ printf("no matching signalling link for hh->proto=0x%02x\n", hh->proto);
+ msgb_free(msg);
+ return -EIO;
+ }
+ msg->trx = link->trx;
+
+ switch (hh->proto) {
+ case IPAC_PROTO_RSL:
+ if (!rsl_up) {
+ e1inp_event(e1i_ts, EVT_E1_TEI_UP, 0, IPAC_PROTO_RSL);
+ rsl_up = 1;
+ }
+ ret = abis_rsl_rcvmsg(msg);
+ break;
+ case IPAC_PROTO_OML:
+ if (!oml_up) {
+ e1inp_event(e1i_ts, EVT_E1_TEI_UP, 0, IPAC_PROTO_OML);
+ oml_up = 1;
+ }
+ ret = abis_nm_rcvmsg(msg);
+ break;
+ default:
+ DEBUGP(DMI, "Unknown IP.access protocol proto=0x%02x\n", hh->proto);
+ msgb_free(msg);
+ 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 msgb *msg;
+ struct ipaccess_head *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 ip.access header */
+ hh = (struct ipaccess_head *) msgb_push(msg, sizeof(*hh));
+ hh->zero = 0;
+ hh->len = msg->len - sizeof(*hh);
+
+ switch (sign_link->type) {
+ case E1INP_SIGN_OML:
+ hh->proto = IPAC_PROTO_OML;
+ break;
+ case E1INP_SIGN_RSL:
+ hh->proto = IPAC_PROTO_RSL;
+ break;
+ default:
+ msgb_free(msg);
+ return -EINVAL;
+ }
+
+ DEBUGP(DMI, "TX %u: %s\n", ts_nr, hexdump(l2_data, hh->len));
+
+ ret = send(bfd->fd, msg->data, msg->len, 0);
+ msgb_free(msg);
+ usleep(100000);
+
+ return ret;
+}
+
+/* callback from select.c in case one of the fd's can be read/written */
+static int ipaccess_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;
+ int rc = 0;
+
+ /* In case of early RSL we might not yet have a line */
+
+ if (line)
+ e1i_ts = &line->ts[idx];
+
+ if (!line || e1i_ts->type == E1INP_TS_TYPE_SIGN) {
+ if (what & BSC_FD_READ)
+ rc = handle_ts1_read(bfd);
+ if (what & BSC_FD_WRITE)
+ rc = handle_ts1_write(bfd);
+ } else
+ fprintf(stderr, "unknown E1 TS type %u\n", e1i_ts->type);
+
+ return rc;
+}
+
+
+static int ts_want_write(struct e1inp_ts *e1i_ts)
+{
+ e1i_ts->driver.ipaccess.fd.when |= BSC_FD_WRITE;
+
+ return 0;
+}
+
+struct e1inp_driver ipaccess_driver = {
+ .name = "ip.access",
+ .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;
+}