Remove ipaccess utils

There's increasing gap in functionality between ipaccess utils from this
repo and from osmo-bsc due to ongoing development in new repository. To
avoid potential user confusion let's drop them similar to the way SGSN
was removed earlier.

Change-Id: I9c04f9b469e60802461a2a6e421d3ba27e6dafa1

1 files changed, 0 insertions, 1226 deletions

diff --git a/openbsc/src/ipaccess/ipaccess-proxy.c b/openbsc/src/ipaccess/ipaccess-proxy.c
deleted file mode 100644
index d3674426c..000000000
--- a/openbsc/src/ipaccess/ipaccess-proxy.c
+++ /dev/null
@@ -1,1226 +0,0 @@
-/* OpenBSC Abis/IP proxy ip.access nanoBTS */
-
-/* (C) 2009 by Harald Welte <laforge@gnumonks.org>
- * (C) 2010 by On-Waves
- * (C) 2010 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 Affero General Public License as published by
- * the Free Software Foundation; either version 3 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 Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- *
- */
-
-#include <stdio.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <errno.h>
-#include <string.h>
-#include <signal.h>
-#include <time.h>
-#include <sys/fcntl.h>
-#include <sys/socket.h>
-#include <sys/ioctl.h>
-#include <arpa/inet.h>
-#include <netinet/in.h>
-
-#define _GNU_SOURCE
-#include <getopt.h>
-
-#include <openbsc/gsm_data.h>
-#include <osmocom/core/application.h>
-#include <osmocom/core/select.h>
-#include <osmocom/gsm/tlv.h>
-#include <osmocom/core/msgb.h>
-#include <osmocom/gsm/ipa.h>
-#include <osmocom/abis/ipa.h>
-#include <osmocom/abis/ipaccess.h>
-#include <openbsc/debug.h>
-#include <openbsc/ipaccess.h>
-#include <openbsc/socket.h>
-#include <osmocom/core/talloc.h>
-
-/* one instance of an ip.access protocol proxy */
-struct ipa_proxy {
-	/* socket where we listen for incoming OML from BTS */
-	struct osmo_fd oml_listen_fd;
-	/* socket where we listen for incoming RSL from BTS */
-	struct osmo_fd rsl_listen_fd;
-	/* list of BTS's (struct ipa_bts_conn */
-	struct llist_head bts_list;
-	/* the BSC reconnect timer */
-	struct osmo_timer_list reconn_timer;
-	/* global GPRS NS data */
-	struct in_addr gprs_addr;
-	struct in_addr listen_addr;
-};
-
-/* global pointer to the proxy structure */
-static struct ipa_proxy *ipp;
-
-struct ipa_proxy_conn {
-	struct osmo_fd fd;
-	struct llist_head tx_queue;
-	struct ipa_bts_conn *bts_conn;
-};
-#define MAX_TRX 4
-
-/* represents a particular BTS in our proxy */
-struct ipa_bts_conn {
-	/* list of BTS's (ipa_proxy->bts_list) */
-	struct llist_head list;
-	/* back pointer to the proxy which we belong to */
-	struct ipa_proxy *ipp;
-	/* the unit ID as determined by CCM */
-	struct {
-		uint16_t site_id;
-		uint16_t bts_id;
-	} unit_id;
-
-	/* incoming connections from BTS */
-	struct ipa_proxy_conn *oml_conn;
-	struct ipa_proxy_conn *rsl_conn[MAX_TRX];
-
-	/* outgoing connections to BSC */
-	struct ipa_proxy_conn *bsc_oml_conn;
-	struct ipa_proxy_conn *bsc_rsl_conn[MAX_TRX];
-
-	/* UDP sockets for BTS and BSC injection */
-	struct osmo_fd udp_bts_fd;
-	struct osmo_fd udp_bsc_fd;
-
-	/* NS data */
-	struct in_addr bts_addr;
-	struct osmo_fd gprs_ns_fd;
-	int gprs_local_port;
-	uint16_t gprs_orig_port;
-	uint32_t gprs_orig_ip;
-
-	char *id_tags[256];
-	uint8_t *id_resp;
-	unsigned int id_resp_len;
-};
-
-enum ipp_fd_type {
-	OML_FROM_BTS = 1,
-	RSL_FROM_BTS = 2,
-	OML_TO_BSC = 3,
-	RSL_TO_BSC = 4,
-	UDP_TO_BTS = 5,
-	UDP_TO_BSC = 6,
-};
-
-/* some of the code against we link from OpenBSC needs this */
-void *tall_bsc_ctx;
-
-static char *listen_ipaddr;
-static char *bsc_ipaddr;
-static char *gprs_ns_ipaddr;
-
-static int gprs_ns_cb(struct osmo_fd *bfd, unsigned int what);
-
-#define PROXY_ALLOC_SIZE	1200
-
-static struct ipa_bts_conn *find_bts_by_unitid(struct ipa_proxy *ipp,
-						uint16_t site_id,
-						uint16_t bts_id)
-{
-	struct ipa_bts_conn *ipbc;
-
-	llist_for_each_entry(ipbc, &ipp->bts_list, list) {
-		if (ipbc->unit_id.site_id == site_id &&
-		    ipbc->unit_id.bts_id == bts_id)
-			return ipbc;
-	}
-
-	return NULL;
-}
-
-struct ipa_proxy_conn *alloc_conn(void)
-{
-	struct ipa_proxy_conn *ipc;
-
-	ipc = talloc_zero(tall_bsc_ctx, struct ipa_proxy_conn);
-	if (!ipc)
-		return NULL;
-
-	INIT_LLIST_HEAD(&ipc->tx_queue);
-
-	return ipc;
-}
-
-static int store_idtags(struct ipa_bts_conn *ipbc, struct tlv_parsed *tlvp)
-{
-	unsigned int i, len;
-
-	for (i = 0; i <= 0xff; i++) {
-		if (!TLVP_PRESENT(tlvp, i))
-			continue;
-
-		len = TLVP_LEN(tlvp, i);
-#if 0
-		if (!ipbc->id_tags[i])
-			ipbc->id_tags[i] = talloc_size(tall_bsc_ctx, len);
-		else
-#endif
-			ipbc->id_tags[i] = talloc_realloc_size(ipbc,
-							  ipbc->id_tags[i], len);
-		if (!ipbc->id_tags[i])
-			return -ENOMEM;
-
-		memset(ipbc->id_tags[i], 0, len);
-		//memcpy(ipbc->id_tags[i], TLVP_VAL(tlvp, i), len);
-	}
-	return 0;
-}
-
-
-static struct ipa_proxy_conn *connect_bsc(struct sockaddr_in *sa, int priv_nr, void *data);
-
-#define logp_ipbc_uid(ss, lvl, ipbc, trx_id) _logp_ipbc_uid(ss, lvl, __FILE__, __LINE__, ipbc, trx_id)
-
-static void _logp_ipbc_uid(unsigned int ss, unsigned int lvl, char *file, int line,
-			   struct ipa_bts_conn *ipbc, uint8_t trx_id)
-{
-	if (ipbc)
-		logp2(ss, lvl, file, line, 0, "(%u/%u/%u) ", ipbc->unit_id.site_id,
-		     ipbc->unit_id.bts_id, trx_id);
-	else
-		logp2(ss, lvl, file, line, 0, "unknown ");
-}
-
-static int handle_udp_read(struct osmo_fd *bfd)
-{
-	struct ipa_bts_conn *ipbc = bfd->data;
-	struct ipa_proxy_conn *other_conn = NULL;
-	struct msgb *msg = msgb_alloc(PROXY_ALLOC_SIZE, "Abis/IP UDP");
-	struct ipaccess_head *hh;
-	int ret;
-
-	/* with UDP sockets, we cannot read partial packets but have to read
-	 * all of it in one go */
-	hh = (struct ipaccess_head *) msg->data;
-	ret = recv(bfd->fd, msg->data, msg->data_len, 0);
-	if (ret < 0) {
-		if (errno != EAGAIN)
-			LOGP(DLINP, LOGL_ERROR, "recv error  %s\n", strerror(errno));
-		msgb_free(msg);
-		return ret;
-	}
-	if (ret == 0) {
-		DEBUGP(DLINP, "UDP peer disappeared, dead socket\n");
-		osmo_fd_unregister(bfd);
-		close(bfd->fd);
-		bfd->fd = -1;
-		msgb_free(msg);
-		return -EIO;
-	}
-	if (ret < sizeof(*hh)) {
-		DEBUGP(DLINP, "could not even read header!?!\n");
-		msgb_free(msg);
-		return -EIO;
-	}
-	msgb_put(msg, ret);
-	msg->l2h = msg->data + sizeof(*hh);
-	DEBUGP(DLMI, "UDP RX: %s\n", osmo_hexdump(msg->data, msg->len));
-
-	if (hh->len != msg->len - sizeof(*hh)) {
-		DEBUGP(DLINP, "length (%u/%u) disagrees with header(%u)\n",
-			msg->len, msg->len - 3, hh->len);
-		msgb_free(msg);
-		return -EIO;
-	}
-
-	switch (bfd->priv_nr & 0xff) {
-	case UDP_TO_BTS:
-		/* injection towards BTS */
-		switch (hh->proto) {
-		case IPAC_PROTO_RSL:
-			/* FIXME: what to do about TRX > 0 */
-			other_conn = ipbc->rsl_conn[0];
-			break;
-		default:
-			DEBUGP(DLINP, "Unknown protocol 0x%02x, sending to "
-				"OML FD\n", hh->proto);
-			/* fall through */
-		case IPAC_PROTO_IPACCESS:
-		case IPAC_PROTO_OML:
-			other_conn = ipbc->oml_conn;
-			break;
-		}
-		break;
-	case UDP_TO_BSC:
-		/* injection towards BSC */
-		switch (hh->proto) {
-		case IPAC_PROTO_RSL:
-			/* FIXME: what to do about TRX > 0 */
-			other_conn = ipbc->bsc_rsl_conn[0];
-			break;
-		default:
-			DEBUGP(DLINP, "Unknown protocol 0x%02x, sending to "
-				"OML FD\n", hh->proto);
-			/* fall through */
-		case IPAC_PROTO_IPACCESS:
-		case IPAC_PROTO_OML:
-			other_conn = ipbc->bsc_oml_conn;
-			break;
-		}
-		break;
-	default:
-		DEBUGP(DLINP, "Unknown filedescriptor priv_nr=%04x\n", bfd->priv_nr);
-		break;
-	}
-
-	if (other_conn) {
-		/* enqueue the message for TX on the respective FD */
-		msgb_enqueue(&other_conn->tx_queue, msg);
-		other_conn->fd.when |= BSC_FD_WRITE;
-	} else
-		msgb_free(msg);
-
-	return 0;
-}
-
-static int handle_udp_write(struct osmo_fd *bfd)
-{
-	/* not implemented yet */
-	bfd->when &= ~BSC_FD_WRITE;
-
-	return -EIO;
-}
-
-/* callback from select.c in case one of the fd's can be read/written */
-static int udp_fd_cb(struct osmo_fd *bfd, unsigned int what)
-{
-	int rc = 0;
-
-	if (what & BSC_FD_READ)
-		rc = handle_udp_read(bfd);
-	if (what & BSC_FD_WRITE)
-		rc = handle_udp_write(bfd);
-
-	return rc;
-}
-
-
-static int ipbc_alloc_connect(struct ipa_proxy_conn *ipc, struct osmo_fd *bfd,
-			      uint16_t site_id, uint16_t bts_id,
-			      uint16_t trx_id, struct tlv_parsed *tlvp,
-			      struct msgb *msg)
-{
-	struct ipa_bts_conn *ipbc;
-	uint16_t udp_port;
-	int ret = 0;
-	struct sockaddr_in sin;
-
-	memset(&sin, 0, sizeof(sin));
-	sin.sin_family = AF_INET;
-	inet_aton(bsc_ipaddr, &sin.sin_addr);
-
-	DEBUGP(DLINP, "(%u/%u/%u) New BTS connection: ",
-		site_id, bts_id, trx_id);
-
-	/* OML needs to be established before RSL */
-	if ((bfd->priv_nr & 0xff) != OML_FROM_BTS) {
-		DEBUGPC(DLINP, "Not a OML connection ?!?\n");
-		return -EIO;
-	}
-
-	/* allocate new BTS connection data structure */
-	ipbc = talloc_zero(tall_bsc_ctx, struct ipa_bts_conn);
-	if (!ipbc) {
-		ret = -ENOMEM;
-		goto err_out;
-	}
-
-	DEBUGPC(DLINP, "Created BTS Conn data structure\n");
-	ipbc->ipp = ipp;
-	ipbc->unit_id.site_id = site_id;
-	ipbc->unit_id.bts_id = bts_id;
-	ipbc->oml_conn = ipc;
-	ipc->bts_conn = ipbc;
-
-	/* store the content of the ID TAGS for later reference */
-	store_idtags(ipbc, tlvp);
-	ipbc->id_resp_len = msg->len;
-	ipbc->id_resp = talloc_size(tall_bsc_ctx, ipbc->id_resp_len);
-	memcpy(ipbc->id_resp, msg->data, ipbc->id_resp_len);
-
-	/* Create OML TCP connection towards BSC */
-	sin.sin_port = htons(IPA_TCP_PORT_OML);
-	ipbc->bsc_oml_conn = connect_bsc(&sin, OML_TO_BSC, ipbc);
-	if (!ipbc->bsc_oml_conn) {
-		ret = -EIO;
-		goto err_bsc_conn;
-	}
-
-	DEBUGP(DLINP, "(%u/%u/%u) OML Connected to BSC\n",
-		site_id, bts_id, trx_id);
-
-	/* Create UDP socket for BTS packet injection */
-	udp_port = 10000 + (site_id % 1000)*100 + (bts_id % 100);
-	ret = make_sock(&ipbc->udp_bts_fd, IPPROTO_UDP, INADDR_ANY, udp_port,
-			UDP_TO_BTS, udp_fd_cb, ipbc);
-	if (ret < 0)
-		goto err_udp_bts;
-	DEBUGP(DLINP, "(%u/%u/%u) Created UDP socket for injection "
-		"towards BTS at port %u\n", site_id, bts_id, trx_id, udp_port);
-
-	/* Create UDP socket for BSC packet injection */
-	udp_port = 20000 + (site_id % 1000)*100 + (bts_id % 100);
-	ret = make_sock(&ipbc->udp_bsc_fd, IPPROTO_UDP, INADDR_ANY, udp_port,
-			UDP_TO_BSC, udp_fd_cb, ipbc);
-	if (ret < 0)
-		goto err_udp_bsc;
-	DEBUGP(DLINP, "(%u/%u/%u) Created UDP socket for injection "
-		"towards BSC at port %u\n", site_id, bts_id, trx_id, udp_port);
-
-
-	/* GPRS NS related code */
-	if (gprs_ns_ipaddr) {
-		struct sockaddr_in sock;
-		socklen_t len = sizeof(sock);
-		struct in_addr addr;
-		uint32_t ip;
-
-		inet_aton(listen_ipaddr, &addr);
-		ip = ntohl(addr.s_addr); /* make_sock() needs host byte order */
-		ret = make_sock(&ipbc->gprs_ns_fd, IPPROTO_UDP, ip, 0, 0,
-				gprs_ns_cb, ipbc);
-		if (ret < 0) {
-			LOGP(DLINP, LOGL_ERROR, "Creating the GPRS socket failed.\n");
-			goto err_udp_bsc;
-		}
-
-		ret = getsockname(ipbc->gprs_ns_fd.fd, (struct sockaddr* ) &sock, &len);
-		ipbc->gprs_local_port = ntohs(sock.sin_port);
-		LOGP(DLINP, LOGL_NOTICE,
-			"Created GPRS NS Socket. Listening on: %s:%d\n",
-			inet_ntoa(sock.sin_addr), ipbc->gprs_local_port);
-
-		ret = getpeername(bfd->fd, (struct sockaddr* ) &sock, &len);
-		ipbc->bts_addr = sock.sin_addr;
-	}
-
-	llist_add(&ipbc->list, &ipp->bts_list);
-
-	return 0;
-
-err_udp_bsc:
-	osmo_fd_unregister(&ipbc->udp_bts_fd);
-err_udp_bts:
-	osmo_fd_unregister(&ipbc->bsc_oml_conn->fd);
-	close(ipbc->bsc_oml_conn->fd.fd);
-	talloc_free(ipbc->bsc_oml_conn);
-	ipbc->bsc_oml_conn = NULL;
-err_bsc_conn:
-	talloc_free(ipbc->id_resp);
-	talloc_free(ipbc);
-#if 0
-	osmo_fd_unregister(bfd);
-	close(bfd->fd);
-	talloc_free(bfd);
-#endif
-err_out:
-	return ret;
-}
-
-static int ipaccess_rcvmsg(struct ipa_proxy_conn *ipc, struct msgb *msg,
-			   struct osmo_fd *bfd)
-{
-	struct tlv_parsed tlvp;
-	uint8_t msg_type = *(msg->l2h);
-	struct ipaccess_unit unit_data;
-	struct ipa_bts_conn *ipbc;
-	int ret = 0;
-
-	switch (msg_type) {
-	case IPAC_MSGT_PING:
-		ret = ipa_ccm_send_pong(bfd->fd);
-		break;
-	case IPAC_MSGT_PONG:
-		DEBUGP(DLMI, "PONG!\n");
-		break;
-	case IPAC_MSGT_ID_RESP:
-		DEBUGP(DLMI, "ID_RESP ");
-		/* parse tags, search for Unit ID */
-		ipa_ccm_idtag_parse(&tlvp, (uint8_t *)msg->l2h + 2,
-				     msgb_l2len(msg)-2);
-		DEBUGP(DLMI, "\n");
-
-		if (!TLVP_PRESENT(&tlvp, IPAC_IDTAG_UNIT)) {
-			LOGP(DLINP, LOGL_ERROR, "No Unit ID in ID RESPONSE !?!\n");
-			return -EIO;
-		}
-
-		/* lookup BTS, create sign_link, ... */
-		memset(&unit_data, 0, sizeof(unit_data));
-		ipa_parse_unitid((char *)TLVP_VAL(&tlvp, IPAC_IDTAG_UNIT),
-				      &unit_data);
-		ipbc = find_bts_by_unitid(ipp, unit_data.site_id, unit_data.bts_id);
-		if (!ipbc) {
-			/* We have not found an ipbc (per-bts proxy instance)
-			 * for this BTS yet.  The first connection of a new BTS must
-			 * be a OML connection.  We allocate the associated data structures,
-			 * and try to connect to the remote end */
-
-			return ipbc_alloc_connect(ipc, bfd, unit_data.site_id,
-						  unit_data.bts_id,
-						  unit_data.trx_id, &tlvp, msg);
-			/* if this fails, the caller will clean up bfd */
-		} else {
-			struct sockaddr_in sin;
-			memset(&sin, 0, sizeof(sin));
-			sin.sin_family = AF_INET;
-			inet_aton(bsc_ipaddr, &sin.sin_addr);
-
-			DEBUGP(DLINP, "Identified BTS %u/%u/%u\n",
-				unit_data.site_id, unit_data.bts_id, unit_data.trx_id);
-
-			if ((bfd->priv_nr & 0xff) != RSL_FROM_BTS) {
-				LOGP(DLINP, LOGL_ERROR, "Second OML connection from "
-				     "same BTS ?!?\n");
-				return 0;
-			}
-
-			if (unit_data.trx_id >= MAX_TRX) {
-				LOGP(DLINP, LOGL_ERROR, "We don't support more "
-				     "than %u TRX\n", MAX_TRX);
-				return -EINVAL;
-			}
-
-			ipc->bts_conn = ipbc;
-			/* store TRX number in higher 8 bit of the bfd private number */
-			bfd->priv_nr |= unit_data.trx_id << 8;
-			ipbc->rsl_conn[unit_data.trx_id] = ipc;
-
-			/* Create RSL TCP connection towards BSC */
-			sin.sin_port = htons(IPA_TCP_PORT_RSL);
-			ipbc->bsc_rsl_conn[unit_data.trx_id] =
-				connect_bsc(&sin, RSL_TO_BSC | (unit_data.trx_id << 8), ipbc);
-			if (!ipbc->bsc_oml_conn)
-				return -EIO;
-			DEBUGP(DLINP, "(%u/%u/%u) Connected RSL to BSC\n",
-				unit_data.site_id, unit_data.bts_id, unit_data.trx_id);
-		}
-		break;
-	case IPAC_MSGT_ID_GET:
-		DEBUGP(DLMI, "ID_GET\n");
-		if ((bfd->priv_nr & 0xff) != OML_TO_BSC &&
-		    (bfd->priv_nr & 0xff) != RSL_TO_BSC) {
-			DEBUGP(DLINP, "IDentity REQuest from BTS ?!?\n");
-			return -EIO;
-		}
-		ipbc = ipc->bts_conn;
-		if (!ipbc) {
-			DEBUGP(DLINP, "ID_GET from BSC before we have ID_RESP from BTS\n");
-			return -EIO;
-		}
-		ret = write(bfd->fd, ipbc->id_resp, ipbc->id_resp_len);
-		if (ret != ipbc->id_resp_len) {
-			LOGP(DLINP, LOGL_ERROR, "Partial write: %d of %d\n",
-			     ret, ipbc->id_resp_len);
-			return -EIO;
-		}
-		ret = 0;
-		break;
-	case IPAC_MSGT_ID_ACK:
-		DEBUGP(DLMI, "ID_ACK? -> ACK!\n");
-		ret = ipa_ccm_send_id_ack(bfd->fd);
-		break;
-	default:
-		LOGP(DLMI, LOGL_ERROR, "Unhandled IPA type; %d\n", msg_type);
-		return 1;
-		break;
-	}
-	return ret;
-}
-
-struct msgb *ipaccess_proxy_read_msg(struct osmo_fd *bfd, int *error)
-{
-	struct msgb *msg = msgb_alloc(PROXY_ALLOC_SIZE, "Abis/IP");
-	struct ipaccess_head *hh;
-	int len, ret = 0;
-
-	if (!msg) {
-		*error = -ENOMEM;
-		return NULL;
-	}
-
-	/* first read our 3-byte header */
-	hh = (struct ipaccess_head *) msg->data;
-	ret = recv(bfd->fd, msg->data, 3, 0);
-	if (ret < 0) {
-		if (errno != EAGAIN)
-			LOGP(DLINP, LOGL_ERROR, "recv error: %s\n", strerror(errno));
-		msgb_free(msg);
-		*error = ret;
-		return NULL;
-	} else if (ret == 0) {
-		msgb_free(msg);
-		*error = ret;
-		return NULL;
-	}
-
-	msgb_put(msg, ret);
-
-	/* then read te length as specified in header */
-	msg->l2h = msg->data + sizeof(*hh);
-	len = ntohs(hh->len);
-	ret = recv(bfd->fd, msg->l2h, len, 0);
-	if (ret < len) {
-		LOGP(DLINP, LOGL_ERROR, "short read!\n");
-		msgb_free(msg);
-		*error = -EIO;
-		return NULL;
-	}
-	msgb_put(msg, ret);
-
-	return msg;
-}
-
-static struct ipa_proxy_conn *ipc_by_priv_nr(struct ipa_bts_conn *ipbc,
-					     unsigned int priv_nr)
-{
-	struct ipa_proxy_conn *bsc_conn;
-	unsigned int trx_id = priv_nr >> 8;
-
-	switch (priv_nr & 0xff) {
-	case OML_FROM_BTS: /* incoming OML data from BTS, forward to BSC OML */
-		bsc_conn = ipbc->bsc_oml_conn;
-		break;
-	case RSL_FROM_BTS: /* incoming RSL data from BTS, forward to BSC RSL */
-		bsc_conn = ipbc->bsc_rsl_conn[trx_id];
-		break;
-	case OML_TO_BSC: /* incoming OML data from BSC, forward to BTS OML */
-		bsc_conn = ipbc->oml_conn;
-		break;
-	case RSL_TO_BSC: /* incoming RSL data from BSC, forward to BTS RSL */
-		bsc_conn = ipbc->rsl_conn[trx_id];
-		break;
-	default:
-		bsc_conn = NULL;
-		break;
-	}
-	return bsc_conn;
-}
-
-static void reconn_tmr_cb(void *data)
-{
-	struct ipa_proxy *ipp = data;
-	struct ipa_bts_conn *ipbc;
-	struct sockaddr_in sin;
-	int i;
-
-	DEBUGP(DLINP, "Running reconnect timer\n");
-
-	memset(&sin, 0, sizeof(sin));
-	sin.sin_family = AF_INET;
-	inet_aton(bsc_ipaddr, &sin.sin_addr);
-
-	llist_for_each_entry(ipbc, &ipp->bts_list, list) {
-		/* if OML to BSC is dead, try to restore it */
-		if (ipbc->oml_conn && !ipbc->bsc_oml_conn) {
-			sin.sin_port = htons(IPA_TCP_PORT_OML);
-			logp_ipbc_uid(DLINP, LOGL_NOTICE, ipbc, 0);
-			LOGPC(DLINP, LOGL_NOTICE, "OML Trying to reconnect\n");
-			ipbc->bsc_oml_conn = connect_bsc(&sin, OML_TO_BSC, ipbc);
-			if (!ipbc->bsc_oml_conn)
-				goto reschedule;
-			logp_ipbc_uid(DLINP, LOGL_NOTICE, ipbc, 0);
-			LOGPC(DLINP, LOGL_NOTICE, "OML Reconnected\n");
-		}
-		/* if we (still) don't have a OML connection, skip RSL */
-		if (!ipbc->oml_conn || !ipbc->bsc_oml_conn)
-			continue;
-
-		for (i = 0; i < ARRAY_SIZE(ipbc->rsl_conn); i++) {
-			unsigned int priv_nr;
-			/* don't establish RSL links which we don't have */
-			if (!ipbc->rsl_conn[i])
-				continue;
-			if (ipbc->bsc_rsl_conn[i])
-				continue;
-			priv_nr = ipbc->rsl_conn[i]->fd.priv_nr;
-			priv_nr &= ~0xff;
-			priv_nr |= RSL_TO_BSC;
-			sin.sin_port = htons(IPA_TCP_PORT_RSL);
-			logp_ipbc_uid(DLINP, LOGL_NOTICE, ipbc, priv_nr >> 8);
-			LOGPC(DLINP, LOGL_NOTICE, "RSL Trying to reconnect\n");
-			ipbc->bsc_rsl_conn[i] = connect_bsc(&sin, priv_nr, ipbc);
-			if (!ipbc->bsc_rsl_conn[i])
-				goto reschedule;
-			logp_ipbc_uid(DLINP, LOGL_NOTICE, ipbc, priv_nr >> 8);
-			LOGPC(DLINP, LOGL_NOTICE, "RSL Reconnected\n");
-		}
-	}
-	return;
-
-reschedule:
-	osmo_timer_schedule(&ipp->reconn_timer, 5, 0);
-}
-
-static void handle_dead_socket(struct osmo_fd *bfd)
-{
-	struct ipa_proxy_conn *ipc = bfd->data;		/* local conn */
-	struct ipa_proxy_conn *bsc_conn;		/* remote conn */
-	struct ipa_bts_conn *ipbc = ipc->bts_conn;
-	unsigned int trx_id = bfd->priv_nr >> 8;
-	struct msgb *msg, *msg2;
-
-	osmo_fd_unregister(bfd);
-	close(bfd->fd);
-	bfd->fd = -1;
-
-	/* FIXME: clear tx_queue, remove all references, etc. */
-	llist_for_each_entry_safe(msg, msg2, &ipc->tx_queue, list)
-		msgb_free(msg);
-
-	switch (bfd->priv_nr & 0xff) {
-	case OML_FROM_BTS: /* incoming OML data from BTS, forward to BSC OML */
-		/* The BTS started a connection with us but we got no
-		 * IPAC_MSGT_ID_RESP message yet, in that scenario we did not
-		 * allocate the ipa_bts_conn structure. */
-		if (ipbc == NULL)
-			break;
-		ipbc->oml_conn = NULL;
-		bsc_conn = ipbc->bsc_oml_conn;
-		/* close the connection to the BSC */
-		osmo_fd_unregister(&bsc_conn->fd);
-		close(bsc_conn->fd.fd);
-		llist_for_each_entry_safe(msg, msg2, &bsc_conn->tx_queue, list)
-			msgb_free(msg);
-		talloc_free(bsc_conn);
-		ipbc->bsc_oml_conn = NULL;
-		/* FIXME: do we need to delete the entire ipbc ? */
-		break;
-	case RSL_FROM_BTS: /* incoming RSL data from BTS, forward to BSC RSL */
-		ipbc->rsl_conn[trx_id] = NULL;
-		bsc_conn = ipbc->bsc_rsl_conn[trx_id];
-		/* close the connection to the BSC */
-		osmo_fd_unregister(&bsc_conn->fd);
-		close(bsc_conn->fd.fd);
-		llist_for_each_entry_safe(msg, msg2, &bsc_conn->tx_queue, list)
-			msgb_free(msg);
-		talloc_free(bsc_conn);
-		ipbc->bsc_rsl_conn[trx_id] = NULL;
-		break;
-	case OML_TO_BSC: /* incoming OML data from BSC, forward to BTS OML */
-		ipbc->bsc_oml_conn = NULL;
-		bsc_conn = ipbc->oml_conn;
-		/* start reconnect timer */
-		osmo_timer_schedule(&ipp->reconn_timer, 5, 0);
-		break;
-	case RSL_TO_BSC: /* incoming RSL data from BSC, forward to BTS RSL */
-		ipbc->bsc_rsl_conn[trx_id] = NULL;
-		bsc_conn = ipbc->rsl_conn[trx_id];
-		/* start reconnect timer */
-		osmo_timer_schedule(&ipp->reconn_timer, 5, 0);
-		break;
-	default:
-		bsc_conn = NULL;
-		break;
-	}
-
-	talloc_free(ipc);
-}
-
-static void patch_gprs_msg(struct ipa_bts_conn *ipbc, int priv_nr, struct msgb *msg)
-{
-	uint8_t *nsvci;
-
-	if ((priv_nr & 0xff) != OML_FROM_BTS && (priv_nr & 0xff) != OML_TO_BSC)
-		return;
-
-	if (msgb_l2len(msg) != 39)
-		return;
-
-	/*
-	 * Check if this is a IPA Set Attribute or IPA Set Attribute ACK
-	 * and if the FOM Class is GPRS NSVC0 and then we will patch it.
-	 *
-	 * The patch assumes the message looks like the one from the trace
-	 * but we only match messages with a specific size anyway... So
-	 * this hack should work just fine.
-	 */
-
-	if (msg->l2h[0] == 0x10 && msg->l2h[1] == 0x80 &&
-	    msg->l2h[2] == 0x00 && msg->l2h[3] == 0x15 &&
-	    msg->l2h[18] == 0xf5 && msg->l2h[19] == 0xf2) {
-		nsvci = &msg->l2h[23];
-		ipbc->gprs_orig_port =  *(uint16_t *)(nsvci+8);
-		ipbc->gprs_orig_ip = *(uint32_t *)(nsvci+10);
-		*(uint16_t *)(nsvci+8) = htons(ipbc->gprs_local_port);
-		*(uint32_t *)(nsvci+10) = ipbc->ipp->listen_addr.s_addr;
-	} else if (msg->l2h[0] == 0x10 && msg->l2h[1] == 0x80 &&
-	    msg->l2h[2] == 0x00 && msg->l2h[3] == 0x15 &&
-	    msg->l2h[18] == 0xf6 && msg->l2h[19] == 0xf2) {
-		nsvci = &msg->l2h[23];
-		*(uint16_t *)(nsvci+8) = ipbc->gprs_orig_port;
-		*(uint32_t *)(nsvci+10) = ipbc->gprs_orig_ip;
-	}
-}
-
-static int handle_tcp_read(struct osmo_fd *bfd)
-{
-	struct ipa_proxy_conn *ipc = bfd->data;
-	struct ipa_bts_conn *ipbc = ipc->bts_conn;
-	struct ipa_proxy_conn *bsc_conn;
-	struct msgb *msg;
-	struct ipaccess_head *hh;
-	int ret = 0;
-	char *btsbsc;
-
-	if ((bfd->priv_nr & 0xff) <= 2)
-		btsbsc = "BTS";
-	else
-		btsbsc = "BSC";
-
-	msg = ipaccess_proxy_read_msg(bfd, &ret);
-	if (!msg) {
-		if (ret == 0) {
-			logp_ipbc_uid(DLINP, LOGL_NOTICE, ipbc, bfd->priv_nr >> 8);
-			LOGPC(DLINP, LOGL_NOTICE, "%s disappeared, "
-			     "dead socket\n", btsbsc);
-			handle_dead_socket(bfd);
-		}
-		return ret;
-	}
-
-	msgb_put(msg, ret);
-	logp_ipbc_uid(DLMI, LOGL_DEBUG, ipbc, bfd->priv_nr >> 8);
-	DEBUGPC(DLMI, "RX<-%s: %s\n", btsbsc, osmo_hexdump(msg->data, msg->len));
-
-	hh = (struct ipaccess_head *) msg->data;
-	if (hh->proto == IPAC_PROTO_IPACCESS) {
-		ret = ipaccess_rcvmsg(ipc, msg, bfd);
-		if (ret < 0) {
-			osmo_fd_unregister(bfd);
-			close(bfd->fd);
-			bfd->fd = -1;
-			talloc_free(bfd);
-			msgb_free(msg);
-			return ret;
-		} else if (ret == 0) {
-			/* we do not forward parts of the CCM protocol
-			 * through the proxy but rather terminate it ourselves. */
-			msgb_free(msg);
-			return ret;
-		}
-	}
-
-	if (!ipbc) {
-		LOGP(DLINP, LOGL_ERROR,
-		     "received %s packet but no ipc->bts_conn?!?\n", btsbsc);
-		msgb_free(msg);
-		return -EIO;
-	}
-
-	bsc_conn = ipc_by_priv_nr(ipbc, bfd->priv_nr);
-	if (bsc_conn) {
-		if (gprs_ns_ipaddr)
-			patch_gprs_msg(ipbc, bfd->priv_nr, msg);
-		/* enqueue packet towards BSC */
-		msgb_enqueue(&bsc_conn->tx_queue, msg);
-		/* mark respective filedescriptor as 'we want to write' */
-		bsc_conn->fd.when |= BSC_FD_WRITE;
-	} else {
-		logp_ipbc_uid(DLINP, LOGL_INFO, ipbc, bfd->priv_nr >> 8);
-		LOGPC(DLINP, LOGL_INFO, "Dropping packet from %s, "
-		     "since remote connection is dead\n", btsbsc);
-		msgb_free(msg);
-	}
-
-	return ret;
-}
-
-/* a TCP socket is ready to be written to */
-static int handle_tcp_write(struct osmo_fd *bfd)
-{
-	struct ipa_proxy_conn *ipc = bfd->data;
-	struct ipa_bts_conn *ipbc = ipc->bts_conn;
-	struct llist_head *lh;
-	struct msgb *msg;
-	char *btsbsc;
-	int ret;
-
-	if ((bfd->priv_nr & 0xff) <= 2)
-		btsbsc = "BTS";
-	else
-		btsbsc = "BSC";
-
-
-	/* get the next msg for this timeslot */
-	if (llist_empty(&ipc->tx_queue)) {
-		bfd->when &= ~BSC_FD_WRITE;
-		return 0;
-	}
-	lh = ipc->tx_queue.next;
-	llist_del(lh);
-	msg = llist_entry(lh, struct msgb, list);
-
-	logp_ipbc_uid(DLMI, LOGL_DEBUG, ipbc, bfd->priv_nr >> 8);
-	DEBUGPC(DLMI, "TX %04x: %s\n", bfd->priv_nr,
-		osmo_hexdump(msg->data, msg->len));
-
-	ret = send(bfd->fd, msg->data, msg->len, 0);
-	msgb_free(msg);
-
-	if (ret == 0) {
-		logp_ipbc_uid(DLINP, LOGL_NOTICE, ipbc, bfd->priv_nr >> 8);
-		LOGP(DLINP, LOGL_NOTICE, "%s disappeared, dead socket\n", btsbsc);
-		handle_dead_socket(bfd);
-	}
-
-	return ret;
-}
-
-/* callback from select.c in case one of the fd's can be read/written */
-static int proxy_ipaccess_fd_cb(struct osmo_fd *bfd, unsigned int what)
-{
-	int rc = 0;
-
-	if (what & BSC_FD_READ) {
-		rc = handle_tcp_read(bfd);
-		if (rc < 0)
-			return rc;
-	}
-	if (what & BSC_FD_WRITE)
-		rc = handle_tcp_write(bfd);
-
-	return rc;
-}
-
-/* callback of the listening filedescriptor */
-static int listen_fd_cb(struct osmo_fd *listen_bfd, unsigned int what)
-{
-	int ret;
-	struct ipa_proxy_conn *ipc;
-	struct osmo_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(DLINP, "accept()ed new %s link from %s\n",
-		(listen_bfd->priv_nr & 0xff) == OML_FROM_BTS ? "OML" : "RSL",
-		inet_ntoa(sa.sin_addr));
-
-	ipc = alloc_conn();
-	if (!ipc) {
-		close(ret);
-		return -ENOMEM;
-	}
-
-	bfd = &ipc->fd;
-	bfd->fd = ret;
-	bfd->data = ipc;
-	bfd->priv_nr = listen_bfd->priv_nr;
-	bfd->cb = proxy_ipaccess_fd_cb;
-	bfd->when = BSC_FD_READ;
-	ret = osmo_fd_register(bfd);
-	if (ret < 0) {
-		LOGP(DLINP, LOGL_ERROR, "could not register FD\n");
-		close(bfd->fd);
-		talloc_free(ipc);
-		return ret;
-	}
-
-	/* Request ID. FIXME: request LOCATION, HW/SW VErsion, Unit Name, Serno */
-	ret = ipa_ccm_send_id_req(bfd->fd);
-
-	return 0;
-}
-
-static void send_ns(int fd, const char *buf, int size, struct in_addr ip, int port)
-{
-	int ret;
-	struct sockaddr_in addr;
-	socklen_t len = sizeof(addr);
-	memset(&addr, 0, sizeof(addr));
-
-	addr.sin_family = AF_INET;
-	addr.sin_port = htons(port);
-	addr.sin_addr = ip;
-
-	ret = sendto(fd, buf, size, 0, (struct sockaddr *) &addr, len);
-	if (ret < 0) {
-		LOGP(DLINP, LOGL_ERROR, "Failed to forward GPRS message.\n");
-	}
-}
-
-static int gprs_ns_cb(struct osmo_fd *bfd, unsigned int what)
-{
-	struct ipa_bts_conn *bts;
-	char buf[4096];
-	int ret;
-	struct sockaddr_in sock;
-	socklen_t len = sizeof(sock);
-
-	/* 1. get the data... */
-	ret = recvfrom(bfd->fd, buf, sizeof(buf), 0, (struct sockaddr *) &sock, &len);
-	if (ret < 0) {
-		LOGP(DLINP, LOGL_ERROR, "Failed to recv GPRS NS msg: %s.\n", strerror(errno));
-		return -1;
-	}
-
-	bts = bfd->data;
-
-	/* 2. figure out where to send it to */
-	if (memcmp(&sock.sin_addr, &ipp->gprs_addr, sizeof(sock.sin_addr)) == 0) {
-		LOGP(DLINP, LOGL_DEBUG, "GPRS NS msg from network.\n");
-		send_ns(bfd->fd, buf, ret, bts->bts_addr, 23000);
-	} else if (memcmp(&sock.sin_addr, &bts->bts_addr, sizeof(sock.sin_addr)) == 0) {
-		LOGP(DLINP, LOGL_DEBUG, "GPRS NS msg from BTS.\n");
-		send_ns(bfd->fd, buf, ret, ipp->gprs_addr, 23000);
-	} else {
-		LOGP(DLINP, LOGL_ERROR, "Unknown GPRS source: %s\n", inet_ntoa(sock.sin_addr));
-	}
-
-	return 0;
-}
-
-/* Actively connect to a BSC.  */
-static struct ipa_proxy_conn *connect_bsc(struct sockaddr_in *sa, int priv_nr, void *data)
-{
-	struct ipa_proxy_conn *ipc;
-	struct osmo_fd *bfd;
-	int ret, on = 1;
-
-	ipc = alloc_conn();
-	if (!ipc)
-		return NULL;
-
-	ipc->bts_conn = data;
-
-	bfd = &ipc->fd;
-	bfd->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
-	bfd->cb = ipaccess_fd_cb;
-	bfd->when = BSC_FD_READ | BSC_FD_WRITE;
-	bfd->data = ipc;
-	bfd->priv_nr = priv_nr;
-
-	if (bfd->fd < 0) {
-		LOGP(DLINP, LOGL_ERROR, "Could not create socket: %s\n",
-			strerror(errno));
-		talloc_free(ipc);
-		return NULL;
-	}
-
-	ret = setsockopt(bfd->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
-	if (ret < 0) {
-		LOGP(DLINP, LOGL_ERROR, "Could not set socket option\n");
-		close(bfd->fd);
-		talloc_free(ipc);
-		return NULL;
-	}
-
-	ret = connect(bfd->fd, (struct sockaddr *) sa, sizeof(*sa));
-	if (ret < 0) {
-		LOGP(DLINP, LOGL_ERROR, "Could not connect socket: %s\n",
-		     inet_ntoa(sa->sin_addr));
-		close(bfd->fd);
-		talloc_free(ipc);
-		return NULL;
-	}
-
-	/* pre-fill tx_queue with identity request */
-	ret = osmo_fd_register(bfd);
-	if (ret < 0) {
-		close(bfd->fd);
-		talloc_free(ipc);
-		return NULL;
-	}
-
-	return ipc;
-}
-
-static int ipaccess_proxy_setup(void)
-{
-	int ret;
-
-	ipp = talloc_zero(tall_bsc_ctx, struct ipa_proxy);
-	if (!ipp)
-		return -ENOMEM;
-	INIT_LLIST_HEAD(&ipp->bts_list);
-	osmo_timer_setup(&ipp->reconn_timer, reconn_tmr_cb, ipp);
-
-	/* Listen for OML connections */
-	ret = make_sock(&ipp->oml_listen_fd, IPPROTO_TCP, INADDR_ANY,
-			IPA_TCP_PORT_OML, OML_FROM_BTS, listen_fd_cb, NULL);
-	if (ret < 0)
-		return ret;
-
-	/* Listen for RSL connections */
-	ret = make_sock(&ipp->rsl_listen_fd, IPPROTO_TCP, INADDR_ANY,
-			IPA_TCP_PORT_RSL, RSL_FROM_BTS, listen_fd_cb, NULL);
-
-	if (ret < 0)
-		return ret;
-
-	/* Connect the GPRS NS Socket */
-	if (gprs_ns_ipaddr) {
-		inet_aton(gprs_ns_ipaddr, &ipp->gprs_addr);
-		inet_aton(listen_ipaddr, &ipp->listen_addr);
-	}
-
-	return ret;
-}
-
-static void signal_handler(int signal)
-{
-	fprintf(stdout, "signal %u received\n", signal);
-
-	switch (signal) {
-	case SIGABRT:
-		/* in case of abort, we want to obtain a talloc report
-		 * and then return to the caller, who will abort the process */
-	case SIGUSR1:
-		talloc_report_full(tall_bsc_ctx, stderr);
-		break;
-	default:
-		break;
-	}
-}
-
-static void print_help(void)
-{
-	printf(" ipaccess-proxy is a proxy BTS.\n");
-	printf(" -h --help. This help text.\n");
-	printf(" -l --listen IP. The ip to listen to.\n");
-	printf(" -b --bsc IP. The BSC IP address.\n");
-	printf(" -g --gprs IP. Take GPRS NS from that IP.\n");
-	printf("\n");
-	printf(" -s --disable-color. Disable the color inside the logging message.\n");
-	printf(" -e --log-level number. Set the global loglevel.\n");
-	printf(" -T --timestamp. Prefix every log message with a timestamp.\n");
-	printf(" -V --version. Print the version of OpenBSC.\n");
-}
-
-static void print_usage(void)
-{
-	printf("Usage: ipaccess-proxy [options]\n");
-}
-
-enum {
-	IPA_PROXY_OPT_LISTEN_NONE	= 0,
-	IPA_PROXY_OPT_LISTEN_IP		= (1 << 0),
-	IPA_PROXY_OPT_BSC_IP		= (1 << 1),
-};
-
-static void handle_options(int argc, char** argv)
-{
-	int options_mask = 0;
-
-	/* disable explicit missing arguments error output from getopt_long */
-	opterr = 0;
-
-	while (1) {
-		int option_index = 0, c;
-		static struct option long_options[] = {
-			{"help", 0, 0, 'h'},
-			{"disable-color", 0, 0, 's'},
-			{"timestamp", 0, 0, 'T'},
-			{"log-level", 1, 0, 'e'},
-			{"listen", 1, 0, 'l'},
-			{"bsc", 1, 0, 'b'},
-			{0, 0, 0, 0}
-		};
-
-		c = getopt_long(argc, argv, "hsTe:l:b:g:",
-				long_options, &option_index);
-		if (c == -1)
-			break;
-
-		switch (c) {
-		case 'h':
-			print_usage();
-			print_help();
-			exit(0);
-		case 'l':
-			listen_ipaddr = optarg;
-			options_mask |= IPA_PROXY_OPT_LISTEN_IP;
-			break;
-		case 'b':
-			bsc_ipaddr = optarg;
-			options_mask |= IPA_PROXY_OPT_BSC_IP;
-			break;
-		case 'g':
-			gprs_ns_ipaddr = optarg;
-			break;
-		case 's':
-			log_set_use_color(osmo_stderr_target, 0);
-			break;
-		case 'T':
-			log_set_print_timestamp(osmo_stderr_target, 1);
-			break;
-		case 'e':
-			log_set_log_level(osmo_stderr_target, atoi(optarg));
-			break;
-		case '?':
-			if (optopt) {
-				printf("ERROR: missing mandatory argument "
-				       "for `%s' option\n", argv[optind-1]);
-			} else {
-				printf("ERROR: unknown option `%s'\n",
-					argv[optind-1]);
-			}
-			print_usage();
-			print_help();
-			exit(EXIT_FAILURE);
-			break;
-		default:
-			/* ignore */
-			break;
-		}
-	}
-	if ((options_mask & (IPA_PROXY_OPT_LISTEN_IP | IPA_PROXY_OPT_BSC_IP))
-		 != (IPA_PROXY_OPT_LISTEN_IP | IPA_PROXY_OPT_BSC_IP)) {
-		printf("ERROR: You have to specify `--listen' and `--bsc' "
-		       "options at least.\n");
-		print_usage();
-		print_help();
-		exit(EXIT_FAILURE);
-	}
-}
-
-int main(int argc, char **argv)
-{
-	int rc;
-
-	tall_bsc_ctx = talloc_named_const(NULL, 1, "ipaccess-proxy");
-	msgb_talloc_ctx_init(tall_bsc_ctx, 0);
-
-	osmo_init_logging(&log_info);
-	log_parse_category_mask(osmo_stderr_target, "DLINP:DLMI");
-
-	handle_options(argc, argv);
-
-	rc = ipaccess_proxy_setup();
-	if (rc < 0)
-		exit(1);
-
-	signal(SIGUSR1, &signal_handler);
-	signal(SIGABRT, &signal_handler);
-	osmo_init_ignore_signals();
-
-	while (1) {
-		osmo_select_main(0);
-	}
-}