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
diff --git a/openbsc/src/gprs/gtphub_main.c b/openbsc/src/gprs/gtphub_main.c
new file mode 100644
index 0000000..e0df0d6
--- /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(>phub_log_info);
+
+ vty_info.copyright = gtphub_copyright;
+ vty_init(&vty_info);
+ logging_vty_add_cmds(>phub_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);
+}