Add GTP hub initial code base.

First steps towards a new GTP hub. The aim is to mux GTP connections, so that
multiple SGSN <--> GGSN links can pass through a single point. Background:
allow having more than one SGSN, possibly in various remote locations.

The recent addition of OAP to GSUP is related to the same background idea.

(This is a collapsed patch of various changes that do not make sense to review
in chronological order anymore, since a lot of it has thorougly transmorphed
after it was first committed.)

Sponsored-by: On-Waves ehf

1 files changed, 282 insertions, 0 deletions

diff --git a/openbsc/src/gprs/gtphub_main.c b/openbsc/src/gprs/gtphub_main.c
new file mode 100644
index 000000000..e0df0d6d3
--- /dev/null
+++ b/openbsc/src/gprs/gtphub_main.c
@@ -0,0 +1,282 @@
+/* GTP Hub main program */
+
+/* (C) 2015 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ *
+ * Author: Neels Hofmeyr
+ *
+ * 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 <unistd.h>
+#include <signal.h>
+#include <string.h>
+#include <errno.h>
+
+#define _GNU_SOURCE
+#include <getopt.h>
+
+#include <osmocom/core/signal.h>
+#include <osmocom/core/application.h>
+#include <osmocom/core/logging.h>
+#include <osmocom/core/utils.h>
+#include <osmocom/core/rate_ctr.h>
+
+#include <osmocom/vty/logging.h>
+#include <osmocom/vty/telnet_interface.h>
+
+#include <openbsc/debug.h>
+#include <openbsc/gtphub.h>
+#include <openbsc/vty.h>
+
+#include "../../bscconfig.h"
+
+#define LOGERR(fmt, args...) \
+	LOGP(DGTPHUB, LOGL_ERROR, fmt, ##args)
+
+#define LOG(fmt, args...) \
+	LOGP(DGTPHUB, LOGL_NOTICE, fmt, ##args)
+
+#ifndef OSMO_VTY_PORT_GTPHUB
+/* should come from libosmocore */
+#define OSMO_VTY_PORT_GTPHUB	4253
+#endif
+
+extern void *osmo_gtphub_ctx;
+
+
+const char *gtphub_copyright =
+	"Copyright (C) 2015 sysmocom s.f.m.c GmbH <info@sysmocom.de>\r\n"
+	"License AGPLv3+: GNU AGPL version 2 or later <http://gnu.org/licenses/agpl-3.0.html>\r\n"
+	"This is free software: you are free to change and redistribute it.\r\n"
+	"There is NO WARRANTY, to the extent permitted by law.\r\n";
+
+static struct log_info_cat gtphub_categories[] = {
+	[DGTPHUB] = {
+		.name = "DGTPHUB",
+		.description = "GTP Hub",
+		.color = "\033[1;33m",
+		.enabled = 1, .loglevel = LOGL_NOTICE,
+	},
+};
+
+int gtphub_log_filter_fn(const struct log_context *ctx,
+			 struct log_target *tar)
+{
+	return 0;
+}
+
+static const struct log_info gtphub_log_info = {
+	.filter_fn = gtphub_log_filter_fn,
+	.cat = gtphub_categories,
+	.num_cat = ARRAY_SIZE(gtphub_categories),
+};
+
+void log_cfg(struct gtphub_cfg *cfg)
+{
+	struct gtphub_cfg_addr *a;
+	a = &cfg->to_sgsns[GTPH_PLANE_CTRL].bind;
+	LOG("to-SGSNs bind, Control: %s port %d\n",
+	    a->addr_str, a->port);
+	a = &cfg->to_sgsns[GTPH_PLANE_USER].bind;
+	LOG("to-SGSNs bind, User:    %s port %d\n",
+	    a->addr_str, a->port);
+	a = &cfg->to_ggsns[GTPH_PLANE_CTRL].bind;
+	LOG("to-GGSNs bind, Control: %s port %d\n",
+	    a->addr_str, a->port);
+	a = &cfg->to_ggsns[GTPH_PLANE_USER].bind;
+	LOG("to-GGSNs bind, User:    %s port %d\n",
+	    a->addr_str, a->port);
+}
+
+static void signal_handler(int signal)
+{
+	fprintf(stdout, "signal %u received\n", signal);
+
+	switch (signal) {
+	case SIGINT:
+		osmo_signal_dispatch(SS_L_GLOBAL, S_L_GLOBAL_SHUTDOWN, NULL);
+		sleep(1);
+		exit(0);
+		break;
+	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:
+	case SIGUSR2:
+		talloc_report_full(osmo_gtphub_ctx, stderr);
+		break;
+	default:
+		break;
+	}
+}
+
+extern int bsc_vty_go_parent(struct vty *vty);
+
+static struct vty_app_info vty_info = {
+	.name 		= "OsmoGTPhub",
+	.version	= PACKAGE_VERSION,
+	.go_parent_cb	= bsc_vty_go_parent,
+	.is_config_node	= bsc_vty_is_config_node,
+};
+
+struct cmdline_cfg {
+	const char *config_file;
+	int daemonize;
+};
+
+static void print_help(struct cmdline_cfg *ccfg)
+{
+	printf("gtphub commandline options\n");
+	printf("  -h --help            This text.\n");
+	printf("  -D --daemonize       Fork the process into a background daemon.\n");
+	printf("  -d,--debug <cat>     Enable Debugging for this category.\n");
+	printf("                       Pass '-d list' to get a category listing.\n");
+	printf("  -s --disable-color");
+	printf("  -c --config-file     The config file to use [%s].\n", ccfg->config_file);
+	printf("  -e,--log-level <nr>  Set a global log level.\n");
+}
+
+static void list_categories(void)
+{
+	printf("Avaliable debug categories:\n");
+	int i;
+	for (i = 0; i < gtphub_log_info.num_cat; ++i) {
+		if (!gtphub_log_info.cat[i].name)
+			continue;
+
+		printf("%s\n", gtphub_log_info.cat[i].name);
+	}
+}
+
+static void handle_options(struct cmdline_cfg *ccfg, int argc, char **argv)
+{
+	while (1) {
+		int option_index = 0, c;
+		static struct option long_options[] = {
+			{"help", 0, 0, 'h'},
+			{"debug", 1, 0, 'd'},
+			{"daemonize", 0, 0, 'D'},
+			{"config-file", 1, 0, 'c'},
+			{"disable-color", 0, 0, 's'},
+			{"timestamp", 0, 0, 'T'},
+			{"log-level", 1, 0, 'e'},
+			{NULL, 0, 0, 0}
+		};
+
+		c = getopt_long(argc, argv, "hd:Dc:sTe:",
+				long_options, &option_index);
+		if (c == -1)
+			break;
+
+		switch (c) {
+		case 'h':
+			//print_usage();
+			print_help(ccfg);
+			exit(0);
+		case 's':
+			log_set_use_color(osmo_stderr_target, 0);
+			break;
+		case 'd':
+			if (strcmp("list", optarg) == 0) {
+				list_categories();
+				exit(0);
+			} else
+				log_parse_category_mask(osmo_stderr_target, optarg);
+			break;
+		case 'D':
+			ccfg->daemonize = 1;
+			break;
+		case 'c':
+			ccfg->config_file = optarg;
+			break;
+		case 'T':
+			log_set_print_timestamp(osmo_stderr_target, 1);
+			break;
+		case 'e':
+			log_set_log_level(osmo_stderr_target, atoi(optarg));
+			break;
+		default:
+			/* ignore */
+			break;
+		}
+	}
+}
+
+int main(int argc, char **argv)
+{
+	int rc;
+
+	osmo_gtphub_ctx = talloc_named_const(NULL, 0, "osmo_gtphub");
+
+	signal(SIGINT, &signal_handler);
+	signal(SIGABRT, &signal_handler);
+	signal(SIGUSR1, &signal_handler);
+	signal(SIGUSR2, &signal_handler);
+	osmo_init_ignore_signals();
+
+	osmo_init_logging(&gtphub_log_info);
+
+	vty_info.copyright = gtphub_copyright;
+	vty_init(&vty_info);
+	logging_vty_add_cmds(&gtphub_log_info);
+        gtphub_vty_init();
+
+	rate_ctr_init(osmo_gtphub_ctx);
+	rc = telnet_init(osmo_gtphub_ctx, 0, OSMO_VTY_PORT_GTPHUB);
+	if (rc < 0)
+		exit(1);
+
+	struct cmdline_cfg _ccfg;
+	struct cmdline_cfg *ccfg = &_ccfg;
+	memset(ccfg, '\0', sizeof(*ccfg));
+	ccfg->config_file = "./gtphub.conf";
+
+	struct gtphub_cfg _cfg;
+	struct gtphub_cfg *cfg = &_cfg;
+	memset(cfg, '\0', sizeof(*cfg));
+
+	struct gtphub _hub;
+	struct gtphub *hub = &_hub;
+
+	handle_options(ccfg, argc, argv);
+
+	rc = gtphub_cfg_read(cfg, ccfg->config_file);
+	if (rc < 0) {
+		LOGP(DGTPHUB, LOGL_FATAL, "Cannot parse config file '%s'\n", ccfg->config_file);
+		exit(2);
+	}
+
+	if (gtphub_start(hub, cfg) != 0)
+		return -1;
+
+	log_cfg(cfg);
+
+	if (ccfg->daemonize) {
+		rc = osmo_daemonize();
+		if (rc < 0) {
+			LOGERR("Error during daemonize");
+			exit(1);
+		}
+	}
+
+	while (1) {
+		rc = osmo_select_main(0);
+		if (rc < 0)
+			exit(3);
+	}
+
+	/* not reached */
+	exit(0);
+}