507 lines
13 KiB
C
507 lines
13 KiB
C
/* GPRS SGSN Implementation */
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/* (C) 2010 by Harald Welte <laforge@gnumonks.org>
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* (C) 2010 by On-Waves
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <unistd.h>
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#include <stdio.h>
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#include <time.h>
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#include <stdlib.h>
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#include <string.h>
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#include <getopt.h>
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#include <errno.h>
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#include <signal.h>
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#include <sys/fcntl.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <osmocom/core/application.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/core/select.h>
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#include <osmocom/core/rate_ctr.h>
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#include <osmocom/core/logging.h>
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#include <osmocom/core/stats.h>
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#include <osmocom/core/sockaddr_str.h>
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#include <osmocom/gprs/gprs_ns2.h>
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#include <osmocom/gprs/gprs_bssgp.h>
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#include <osmocom/gprs/gprs_bssgp_bss.h>
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#include <osmocom/vty/telnet_interface.h>
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#include <osmocom/vty/logging.h>
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#include <osmocom/vty/stats.h>
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#include <osmocom/vty/ports.h>
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#include <osmocom/vty/misc.h>
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#include <osmocom/vty/cpu_sched_vty.h>
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#include <osmocom/ctrl/control_vty.h>
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#include <osmocom/sgsn/signal.h>
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#include <osmocom/sgsn/debug.h>
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#include <osmocom/sgsn/vty.h>
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#include <osmocom/sgsn/sgsn.h>
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#include <osmocom/sgsn/gprs_llc.h>
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#include <osmocom/sgsn/gprs_sndcp.h>
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#include <osmocom/sgsn/gprs_gmm.h>
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#include <osmocom/sgsn/gprs_ranap.h>
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#include <osmocom/sgsn/gprs_ns.h>
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#include <osmocom/sgsn/gprs_bssgp.h>
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#include <osmocom/sgsn/gprs_subscriber.h>
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#include <osmocom/sgsn/gtp.h>
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#include <gtp.h>
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#include <osmocom/sgsn/sgsn_rim.h>
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#include "../../config.h"
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#if BUILD_IU
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#include <osmocom/sigtran/osmo_ss7.h>
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#include <osmocom/sigtran/protocol/m3ua.h>
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#include <osmocom/ranap/iu_client.h>
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#endif
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#define _GNU_SOURCE
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#include <getopt.h>
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void *tall_sgsn_ctx;
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struct gprs_ns2_inst *sgsn_nsi;
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static int daemonize = 0;
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const char *openbsc_copyright =
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"Copyright (C) 2010 Harald Welte and On-Waves\r\n"
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"License AGPLv3+: GNU AGPL version 3 or later <http://gnu.org/licenses/agpl-3.0.html>\r\n"
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"This is free software: you are free to change and redistribute it.\r\n"
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"There is NO WARRANTY, to the extent permitted by law.\r\n";
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#define CONFIG_FILE_DEFAULT "osmo-sgsn.cfg"
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#define CONFIG_FILE_LEGACY "osmo_sgsn.cfg"
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struct sgsn_instance *sgsn;
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/* call-back function for the BSSGP protocol.
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* Must be left here so that we can add a new one in tests/sgsn_test */
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int bssgp_prim_cb(struct osmo_prim_hdr *oph, void *ctx)
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{
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return sgsn_bssgp_rx_prim(oph);
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}
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static void signal_handler(int signum)
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{
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fprintf(stdout, "signal %u received\n", signum);
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switch (signum) {
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case SIGINT:
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case SIGTERM:
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osmo_signal_dispatch(SS_L_GLOBAL, S_L_GLOBAL_SHUTDOWN, NULL);
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sleep(1);
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exit(0);
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break;
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case SIGABRT:
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/* in case of abort, we want to obtain a talloc report and
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* then run default SIGABRT handler, who will generate coredump
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* and abort the process. abort() should do this for us after we
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* return, but program wouldn't exit if an external SIGABRT is
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* received.
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*/
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talloc_report(tall_vty_ctx, stderr);
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talloc_report_full(tall_sgsn_ctx, stderr);
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signal(SIGABRT, SIG_DFL);
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raise(SIGABRT);
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break;
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case SIGUSR1:
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talloc_report(tall_vty_ctx, stderr);
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talloc_report_full(tall_sgsn_ctx, stderr);
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break;
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case SIGUSR2:
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talloc_report_full(tall_vty_ctx, stderr);
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break;
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default:
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break;
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}
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}
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static int sgsn_vty_go_parent(struct vty *vty)
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{
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switch (vty->node) {
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case SGSN_NODE:
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vty->node = CONFIG_NODE;
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break;
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case MME_NODE:
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vty->node = SGSN_NODE;
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vty->index = NULL;
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break;
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default:
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#if BUILD_IU
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osmo_ss7_vty_go_parent(vty);
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#else
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vty->node = CONFIG_NODE;
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vty->index = NULL;
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#endif
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break;
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}
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return vty->node;
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}
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/* NSI that BSSGP uses when transmitting on NS */
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extern struct gprs_ns_inst *bssgp_nsi;
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static struct vty_app_info vty_info = {
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.name = "OsmoSGSN",
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.version = PACKAGE_VERSION,
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.go_parent_cb = sgsn_vty_go_parent,
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};
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static void print_help(void)
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{
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printf("Some useful help...\n");
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printf(" -h --help\tthis text\n");
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printf(" -V --version\tPrint the version\n");
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printf(" -D --daemonize\tFork the process into a background daemon\n");
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printf(" -d option --debug\tenable Debugging\n");
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printf(" -s --disable-color\n");
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printf(" -c --config-file\tThe config file to use [%s]\n", CONFIG_FILE_DEFAULT);
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printf(" -e --log-level number\tSet a global log level\n");
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printf("\nVTY reference generation:\n");
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printf(" --vty-ref-mode MODE VTY reference generation mode (e.g. 'expert').\n");
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printf(" --vty-ref-xml Generate the VTY reference XML output and exit.\n");
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}
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static void handle_long_options(const char *prog_name, const int long_option)
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{
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static int vty_ref_mode = VTY_REF_GEN_MODE_DEFAULT;
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switch (long_option) {
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case 1:
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vty_ref_mode = get_string_value(vty_ref_gen_mode_names, optarg);
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if (vty_ref_mode < 0) {
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fprintf(stderr, "%s: Unknown VTY reference generation "
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"mode '%s'\n", prog_name, optarg);
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exit(2);
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}
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break;
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case 2:
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fprintf(stderr, "Generating the VTY reference in mode '%s' (%s)\n",
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get_value_string(vty_ref_gen_mode_names, vty_ref_mode),
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get_value_string(vty_ref_gen_mode_desc, vty_ref_mode));
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vty_dump_xml_ref_mode(stdout, (enum vty_ref_gen_mode) vty_ref_mode);
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exit(0);
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default:
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fprintf(stderr, "%s: error parsing cmdline options\n", prog_name);
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exit(2);
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}
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}
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static void handle_options(int argc, char **argv)
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{
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while (1) {
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int option_index = 0, c;
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static int long_option = 0;
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static struct option long_options[] = {
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{"help", 0, 0, 'h'},
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{"debug", 1, 0, 'd'},
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{"daemonize", 0, 0, 'D'},
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{"config-file", 1, 0, 'c'},
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{"disable-color", 0, 0, 's'},
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{"timestamp", 0, 0, 'T'},
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{ "version", 0, 0, 'V' },
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{"log-level", 1, 0, 'e'},
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{"vty-ref-mode", 1, &long_option, 1},
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{"vty-ref-xml", 0, &long_option, 2},
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{NULL, 0, 0, 0}
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};
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c = getopt_long(argc, argv, "hd:Dc:sTVe:",
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long_options, &option_index);
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if (c == -1)
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break;
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switch (c) {
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case 0:
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handle_long_options(argv[0], long_option);
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break;
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case 'h':
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//print_usage();
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print_help();
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exit(0);
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case 's':
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log_set_use_color(osmo_stderr_target, 0);
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break;
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case 'd':
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log_parse_category_mask(osmo_stderr_target, optarg);
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break;
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case 'D':
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daemonize = 1;
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break;
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case 'c':
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osmo_talloc_replace_string(sgsn, &sgsn->config_file, optarg);
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break;
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case 'T':
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log_set_print_timestamp(osmo_stderr_target, 1);
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break;
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case 'V':
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print_version(1);
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exit(0);
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break;
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case 'e':
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log_set_log_level(osmo_stderr_target, atoi(optarg));
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break;
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default:
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/* ignore */
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break;
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}
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}
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if (argc > optind) {
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fprintf(stderr, "Unsupported positional arguments on command line\n");
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exit(2);
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}
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}
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/* default categories */
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static struct log_info_cat gprs_categories[] = {
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[DMM] = {
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.name = "DMM",
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.description = "Layer3 Mobility Management (MM)",
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.color = "\033[1;33m",
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.enabled = 1, .loglevel = LOGL_NOTICE,
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},
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[DPAG] = {
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.name = "DPAG",
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.description = "Paging Subsystem",
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.color = "\033[1;38m",
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.enabled = 1, .loglevel = LOGL_NOTICE,
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},
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[DMEAS] = {
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.name = "DMEAS",
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.description = "Radio Measurement Processing",
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.enabled = 0, .loglevel = LOGL_NOTICE,
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},
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[DREF] = {
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.name = "DREF",
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.description = "Reference Counting",
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.enabled = 0, .loglevel = LOGL_NOTICE,
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},
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[DGPRS] = {
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.name = "DGPRS",
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.description = "GPRS Packet Service",
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.enabled = 1, .loglevel = LOGL_NOTICE,
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},
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[DLLC] = {
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.name = "DLLC",
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.description = "GPRS Logical Link Control Protocol (LLC)",
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.enabled = 1, .loglevel = LOGL_NOTICE,
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},
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[DSNDCP] = {
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.name = "DSNDCP",
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.description = "GPRS Sub-Network Dependent Control Protocol (SNDCP)",
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.enabled = 1, .loglevel = LOGL_NOTICE,
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},
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[DRANAP] = {
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.name = "DRANAP",
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.description = "RAN Application Part (RANAP)",
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.enabled = 1, .loglevel = LOGL_NOTICE,
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},
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[DSUA] = {
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.name = "DSUA",
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.description = "SCCP User Adaptation (SUA)",
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.enabled = 1, .loglevel = LOGL_NOTICE,
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},
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[DSLHC] = {
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.name = "DSLHC",
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.description = "RFC1144 TCP/IP Header compression (SLHC)",
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.enabled = 1, .loglevel = LOGL_NOTICE,
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},
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[DV42BIS] = {
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.name = "DV42BIS",
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.description = "V.42bis data compression (SNDCP)",
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.enabled = 1, .loglevel = LOGL_NOTICE,
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},
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[DGTP] = {
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.name = "DGTP",
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.description = "GPRS Tunnelling Protocol (GTP)",
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.enabled = 1, .loglevel = LOGL_NOTICE,
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},
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[DRIM] = {
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.name = "DRIM",
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.description = "RAN Information Management (RIM)",
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.enabled = 1, .loglevel = LOGL_NOTICE,
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},
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};
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static const struct log_info gprs_log_info = {
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.filter_fn = gprs_log_filter_fn,
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.cat = gprs_categories,
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.num_cat = ARRAY_SIZE(gprs_categories),
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};
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static bool file_exists(const char *path)
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{
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struct stat sb;
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return stat(path, &sb) ? false : true;
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}
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int main(int argc, char **argv)
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{
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int rc;
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#if BUILD_IU
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struct osmo_sccp_instance *sccp;
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#endif
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srand(time(NULL));
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tall_sgsn_ctx = talloc_named_const(NULL, 0, "osmo_sgsn");
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sgsn = sgsn_instance_alloc(tall_sgsn_ctx);
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msgb_talloc_ctx_init(tall_sgsn_ctx, 0);
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vty_info.tall_ctx = tall_sgsn_ctx;
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signal(SIGINT, &signal_handler);
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signal(SIGTERM, &signal_handler);
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signal(SIGABRT, &signal_handler);
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signal(SIGUSR1, &signal_handler);
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signal(SIGUSR2, &signal_handler);
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osmo_init_ignore_signals();
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osmo_init_logging2(tall_sgsn_ctx, &gprs_log_info);
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osmo_stats_init(tall_sgsn_ctx);
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vty_info.copyright = openbsc_copyright;
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vty_init(&vty_info);
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logging_vty_add_cmds();
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osmo_talloc_vty_add_cmds();
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osmo_stats_vty_add_cmds();
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sgsn_vty_init(&sgsn->cfg);
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ctrl_vty_init(tall_sgsn_ctx);
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osmo_cpu_sched_vty_init(tall_sgsn_ctx);
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#if BUILD_IU
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OSMO_ASSERT(osmo_ss7_init() == 0);
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osmo_ss7_vty_init_asp(tall_sgsn_ctx);
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osmo_sccp_vty_init();
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#endif
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rate_ctr_init(tall_sgsn_ctx);
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logging_vty_add_deprecated_subsys(tall_sgsn_ctx, "bssgp");
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logging_vty_add_deprecated_subsys(tall_sgsn_ctx, "ns");
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sgsn_nsi = gprs_ns2_instantiate(tall_sgsn_ctx, &gprs_ns_prim_cb, NULL);
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if (!sgsn_nsi) {
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LOGP(DGPRS, LOGL_ERROR, "Unable to instantiate NS\n");
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exit(1);
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}
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sgsn->cfg.nsi = sgsn_nsi;
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bssgp_set_bssgp_callback(sgsn_bssgp_dispatch_ns_unitdata_req_cb, sgsn_nsi);
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gprs_llc_init("/usr/local/lib/osmocom/crypt/");
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gprs_ns2_vty_init(sgsn_nsi);
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bssgp_vty_init();
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gprs_llc_vty_init();
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gprs_sndcp_vty_init();
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handle_options(argc, argv);
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/* Backwards compatibility: for years, the default config file name was
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* osmo_sgsn.cfg. All other Osmocom programs use osmo-*.cfg with a
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* dash. To be able to use the new config file name without breaking
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* previous setups that might rely on the legacy default config file
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* name, we need to look for the old config file if no -c option was
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* passed AND no file exists with the new default file name. */
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if (!sgsn->config_file) {
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/* No -c option was passed */
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if (file_exists(CONFIG_FILE_LEGACY)
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&& !file_exists(CONFIG_FILE_DEFAULT))
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osmo_talloc_replace_string(sgsn, &sgsn->config_file, CONFIG_FILE_LEGACY);
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else
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osmo_talloc_replace_string(sgsn, &sgsn->config_file, CONFIG_FILE_DEFAULT);
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}
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rc = sgsn_parse_config(sgsn->config_file);
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if (rc < 0) {
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LOGP(DGPRS, LOGL_FATAL, "Error in config file\n");
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exit(2);
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}
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/* start telnet after reading config for vty_get_bind_addr() */
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rc = telnet_init_dynif(tall_sgsn_ctx, NULL,
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vty_get_bind_addr(), OSMO_VTY_PORT_SGSN);
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if (rc < 0)
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exit(1);
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rc = sgsn_gtp_init(sgsn);
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if (rc) {
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LOGP(DGPRS, LOGL_FATAL, "Cannot bind/listen on GTP socket\n");
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exit(2);
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} else
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LOGP(DGPRS, LOGL_NOTICE, "libGTP v%s initialized\n", gtp_version());
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rc = sgsn_inst_init(sgsn);
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if (rc < 0) {
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LOGP(DGPRS, LOGL_FATAL, "Cannot set up SGSN\n");
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exit(2);
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}
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if (sgsn->cfg.dynamic_lookup) {
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if (sgsn_ares_init(sgsn) != 0) {
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LOGP(DGPRS, LOGL_FATAL,
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"Failed to initialize c-ares(%d)\n", rc);
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exit(4);
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}
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}
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#if BUILD_IU
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/* Note that these are mostly defaults and can be overriden from the VTY */
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|
sccp = osmo_sccp_simple_client_on_ss7_id(tall_sgsn_ctx,
|
|
sgsn->cfg.iu.cs7_instance,
|
|
"OsmoSGSN",
|
|
(23 << 3) + 4,
|
|
OSMO_SS7_ASP_PROT_M3UA,
|
|
0, "localhost",
|
|
0, "localhost");
|
|
if (!sccp) {
|
|
printf("Setting up SCCP client failed.\n");
|
|
return 8;
|
|
}
|
|
|
|
ranap_iu_init(tall_sgsn_ctx, DRANAP, "OsmoSGSN-IuPS", sccp, gsm0408_gprs_rcvmsg_iu, sgsn_ranap_iu_event);
|
|
#endif
|
|
|
|
if (daemonize) {
|
|
rc = osmo_daemonize();
|
|
if (rc < 0) {
|
|
perror("Error during daemonize");
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
while (1) {
|
|
rc = osmo_select_main(0);
|
|
if (rc < 0)
|
|
exit(3);
|
|
}
|
|
|
|
/* not reached */
|
|
exit(0);
|
|
}
|