Holger Hans Peter Freyther | 89d9fd9 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 1 | /* BSC Multiplexer/NAT */ |
| 2 | |
| 3 | /* |
| 4 | * (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org> |
Holger Hans Peter Freyther | 98e49d4 | 2010-06-15 18:46:56 +0800 | [diff] [blame] | 5 | * (C) 2010 by On-Waves |
Holger Hans Peter Freyther | e8fa0f1 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 6 | * (C) 2009 by Harald Welte <laforge@gnumonks.org> |
Holger Hans Peter Freyther | 89d9fd9 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 7 | * All Rights Reserved |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License along |
| 20 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 21 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 22 | * |
| 23 | */ |
| 24 | #include <sys/socket.h> |
| 25 | #include <netinet/in.h> |
Holger Hans Peter Freyther | 150fa58 | 2010-05-05 18:58:13 +0800 | [diff] [blame] | 26 | #include <netinet/tcp.h> |
Holger Hans Peter Freyther | 89d9fd9 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 27 | #include <arpa/inet.h> |
| 28 | |
Holger Hans Peter Freyther | e8fa0f1 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 29 | #include <errno.h> |
Holger Hans Peter Freyther | e907cb2 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 30 | #include <signal.h> |
Holger Hans Peter Freyther | 89d9fd9 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 31 | #include <stdio.h> |
| 32 | #include <stdlib.h> |
Holger Hans Peter Freyther | fd012d5 | 2010-01-12 21:36:08 +0100 | [diff] [blame] | 33 | #include <time.h> |
Holger Hans Peter Freyther | 89d9fd9 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 34 | #include <unistd.h> |
| 35 | |
| 36 | #define _GNU_SOURCE |
| 37 | #include <getopt.h> |
| 38 | |
| 39 | #include <openbsc/debug.h> |
Holger Hans Peter Freyther | e907cb2 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 40 | #include <openbsc/bsc_msc.h> |
Holger Hans Peter Freyther | 57adba5 | 2010-06-15 18:45:26 +0800 | [diff] [blame] | 41 | #include <openbsc/bsc_nat.h> |
Holger Hans Peter Freyther | 4a9dd3b | 2010-07-31 05:17:17 +0800 | [diff] [blame] | 42 | #include <openbsc/bsc_nat_sccp.h> |
Holger Hans Peter Freyther | e907cb2 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 43 | #include <openbsc/ipaccess.h> |
| 44 | #include <openbsc/abis_nm.h> |
Holger Hans Peter Freyther | 4fcedba | 2010-06-15 20:14:08 +0800 | [diff] [blame] | 45 | #include <openbsc/vty.h> |
Holger Hans Peter Freyther | 5e54788 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 46 | |
Holger Hans Peter Freyther | 605eba7 | 2010-06-15 18:52:24 +0800 | [diff] [blame] | 47 | #include <osmocore/gsm0808.h> |
Holger Hans Peter Freyther | 3b96089 | 2010-06-15 19:06:18 +0800 | [diff] [blame] | 48 | #include <osmocore/talloc.h> |
Harald Welte | c4ae176 | 2010-08-25 19:43:54 +0200 | [diff] [blame] | 49 | #include <osmocore/process.h> |
Holger Hans Peter Freyther | 3b96089 | 2010-06-15 19:06:18 +0800 | [diff] [blame] | 50 | |
Holger Hans Peter Freyther | e36be81 | 2010-06-15 20:13:33 +0800 | [diff] [blame] | 51 | #include <osmocore/protocol/gsm_08_08.h> |
Holger Hans Peter Freyther | 89d9fd9 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 52 | |
Holger Hans Peter Freyther | 4fcedba | 2010-06-15 20:14:08 +0800 | [diff] [blame] | 53 | #include <osmocom/vty/telnet_interface.h> |
| 54 | #include <osmocom/vty/vty.h> |
| 55 | |
Harald Welte | 90e5eae | 2010-08-03 15:11:51 +0200 | [diff] [blame] | 56 | #include <osmocom/sccp/sccp.h> |
Holger Hans Peter Freyther | 57adba5 | 2010-06-15 18:45:26 +0800 | [diff] [blame] | 57 | |
Holger Hans Peter Freyther | 4fcedba | 2010-06-15 20:14:08 +0800 | [diff] [blame] | 58 | #include "../../bscconfig.h" |
| 59 | |
Holger Hans Peter Freyther | 6088cc7 | 2010-06-15 18:51:56 +0800 | [diff] [blame] | 60 | #define SCCP_CLOSE_TIME 20 |
| 61 | #define SCCP_CLOSE_TIME_TIMEOUT 19 |
| 62 | |
Holger Hans Peter Freyther | 4acca1a | 2010-06-15 19:14:12 +0800 | [diff] [blame] | 63 | struct log_target *stderr_target; |
Holger Hans Peter Freyther | 5e54788 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 64 | static const char *config_file = "bsc-nat.cfg"; |
Holger Hans Peter Freyther | 89d9fd9 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 65 | static struct in_addr local_addr; |
Holger Hans Peter Freyther | bea0ac6 | 2010-03-26 06:51:04 +0100 | [diff] [blame] | 66 | static struct bsc_fd bsc_listen; |
Holger Hans Peter Freyther | 9226d70 | 2010-06-15 18:51:04 +0800 | [diff] [blame] | 67 | static const char *msc_ip = NULL; |
Holger Hans Peter Freyther | 6088cc7 | 2010-06-15 18:51:56 +0800 | [diff] [blame] | 68 | static struct timer_list sccp_close; |
Harald Welte | c4ae176 | 2010-08-25 19:43:54 +0200 | [diff] [blame] | 69 | static int daemonize = 0; |
Holger Hans Peter Freyther | e907cb2 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 70 | |
Holger Hans Peter Freyther | 4fcedba | 2010-06-15 20:14:08 +0800 | [diff] [blame] | 71 | const char *openbsc_copyright = |
Holger Hans Peter Freyther | 260646d | 2010-09-11 13:32:30 +0800 | [diff] [blame] | 72 | "Copyright (C) 2010 Holger Hans Peter Freyther and On-Waves\r\n" |
| 73 | "License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html>\r\n" |
| 74 | "This is free software: you are free to change and redistribute it.\r\n" |
| 75 | "There is NO WARRANTY, to the extent permitted by law.\r\n"; |
Holger Hans Peter Freyther | 4a62960 | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 76 | |
Holger Hans Peter Freyther | 5e54788 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 77 | static struct bsc_nat *nat; |
Holger Hans Peter Freyther | 0b77635 | 2010-07-23 19:08:55 +0800 | [diff] [blame] | 78 | static void bsc_send_data(struct bsc_connection *bsc, const uint8_t *data, unsigned int length, int); |
Holger Hans Peter Freyther | dc81393 | 2010-04-07 11:20:36 +0200 | [diff] [blame] | 79 | static void msc_send_reset(struct bsc_msc_connection *con); |
Holger Hans Peter Freyther | 5e54788 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 80 | |
Holger Hans Peter Freyther | 5e54788 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 81 | struct bsc_config *bsc_config_num(struct bsc_nat *nat, int num) |
| 82 | { |
| 83 | struct bsc_config *conf; |
| 84 | |
| 85 | llist_for_each_entry(conf, &nat->bsc_configs, entry) |
| 86 | if (conf->nr == num) |
| 87 | return conf; |
| 88 | |
| 89 | return NULL; |
| 90 | } |
Holger Hans Peter Freyther | 4a62960 | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 91 | |
Holger Hans Peter Freyther | e907cb2 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 92 | /* |
| 93 | * below are stubs we need to link |
| 94 | */ |
Holger Hans Peter Freyther | 0b77635 | 2010-07-23 19:08:55 +0800 | [diff] [blame] | 95 | int nm_state_event(enum nm_evt evt, uint8_t obj_class, void *obj, |
Holger Hans Peter Freyther | c4aa270 | 2010-05-12 16:55:12 +0800 | [diff] [blame] | 96 | struct gsm_nm_state *old_state, struct gsm_nm_state *new_state, |
| 97 | struct abis_om_obj_inst *obj_ins) |
Holger Hans Peter Freyther | e907cb2 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 98 | { |
| 99 | return -1; |
| 100 | } |
| 101 | |
| 102 | void input_event(int event, enum e1inp_sign_type type, struct gsm_bts_trx *trx) |
| 103 | {} |
| 104 | |
Holger Hans Peter Freyther | d0a8794 | 2010-09-16 06:33:27 +0800 | [diff] [blame] | 105 | static void queue_for_msc(struct bsc_msc_connection *con, struct msgb *msg) __attribute__((nonnull (1, 2))); |
Holger Hans Peter Freyther | 754787c | 2010-04-22 19:11:37 +0800 | [diff] [blame] | 106 | static void queue_for_msc(struct bsc_msc_connection *con, struct msgb *msg) |
| 107 | { |
Holger Hans Peter Freyther | 6a2fe9a | 2010-07-05 13:58:40 +0800 | [diff] [blame] | 108 | if (write_queue_enqueue(&con->write_queue, msg) != 0) { |
Holger Hans Peter Freyther | 754787c | 2010-04-22 19:11:37 +0800 | [diff] [blame] | 109 | LOGP(DINP, LOGL_ERROR, "Failed to enqueue the write.\n"); |
| 110 | msgb_free(msg); |
| 111 | } |
| 112 | } |
| 113 | |
Holger Hans Peter Freyther | 2ec5517 | 2010-03-26 09:18:02 +0100 | [diff] [blame] | 114 | static void send_reset_ack(struct bsc_connection *bsc) |
Holger Hans Peter Freyther | 722ead8 | 2010-01-30 12:45:10 +0100 | [diff] [blame] | 115 | { |
Holger Hans Peter Freyther | 0b77635 | 2010-07-23 19:08:55 +0800 | [diff] [blame] | 116 | static const uint8_t gsm_reset_ack[] = { |
Holger Hans Peter Freyther | 722ead8 | 2010-01-30 12:45:10 +0100 | [diff] [blame] | 117 | 0x09, 0x00, 0x03, 0x07, 0x0b, 0x04, 0x43, 0x01, |
| 118 | 0x00, 0xfe, 0x04, 0x43, 0x5c, 0x00, 0xfe, 0x03, |
| 119 | 0x00, 0x01, 0x31, |
| 120 | }; |
| 121 | |
Holger Hans Peter Freyther | eb4edde | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 122 | bsc_send_data(bsc, gsm_reset_ack, sizeof(gsm_reset_ack), IPAC_PROTO_SCCP); |
Holger Hans Peter Freyther | 722ead8 | 2010-01-30 12:45:10 +0100 | [diff] [blame] | 123 | } |
| 124 | |
Holger Hans Peter Freyther | 582511a | 2010-05-02 19:28:59 +0800 | [diff] [blame] | 125 | static void send_ping(struct bsc_connection *bsc) |
| 126 | { |
Holger Hans Peter Freyther | 0b77635 | 2010-07-23 19:08:55 +0800 | [diff] [blame] | 127 | static const uint8_t id_ping[] = { |
Holger Hans Peter Freyther | 582511a | 2010-05-02 19:28:59 +0800 | [diff] [blame] | 128 | IPAC_MSGT_PING, |
| 129 | }; |
| 130 | |
| 131 | bsc_send_data(bsc, id_ping, sizeof(id_ping), IPAC_PROTO_IPACCESS); |
| 132 | } |
| 133 | |
Holger Hans Peter Freyther | 453235a | 2010-06-15 18:51:33 +0800 | [diff] [blame] | 134 | static void send_pong(struct bsc_connection *bsc) |
| 135 | { |
Holger Hans Peter Freyther | 0b77635 | 2010-07-23 19:08:55 +0800 | [diff] [blame] | 136 | static const uint8_t id_pong[] = { |
Holger Hans Peter Freyther | 453235a | 2010-06-15 18:51:33 +0800 | [diff] [blame] | 137 | IPAC_MSGT_PONG, |
| 138 | }; |
| 139 | |
| 140 | bsc_send_data(bsc, id_pong, sizeof(id_pong), IPAC_PROTO_IPACCESS); |
| 141 | } |
| 142 | |
Holger Hans Peter Freyther | 582511a | 2010-05-02 19:28:59 +0800 | [diff] [blame] | 143 | static void bsc_pong_timeout(void *_bsc) |
| 144 | { |
| 145 | struct bsc_connection *bsc = _bsc; |
| 146 | |
| 147 | LOGP(DNAT, LOGL_ERROR, "BSC Nr: %d PONG timeout.\n", bsc->cfg->nr); |
| 148 | bsc_close_connection(bsc); |
| 149 | } |
| 150 | |
| 151 | static void bsc_ping_timeout(void *_bsc) |
| 152 | { |
| 153 | struct bsc_connection *bsc = _bsc; |
| 154 | |
Holger Hans Peter Freyther | acd3078 | 2010-05-05 16:57:38 +0800 | [diff] [blame] | 155 | if (bsc->nat->ping_timeout < 0) |
| 156 | return; |
| 157 | |
Holger Hans Peter Freyther | 582511a | 2010-05-02 19:28:59 +0800 | [diff] [blame] | 158 | send_ping(bsc); |
| 159 | |
| 160 | /* send another ping in 20 seconds */ |
Holger Hans Peter Freyther | acd3078 | 2010-05-05 16:57:38 +0800 | [diff] [blame] | 161 | bsc_schedule_timer(&bsc->ping_timeout, bsc->nat->ping_timeout, 0); |
Holger Hans Peter Freyther | 582511a | 2010-05-02 19:28:59 +0800 | [diff] [blame] | 162 | |
| 163 | /* also start a pong timer */ |
Holger Hans Peter Freyther | acd3078 | 2010-05-05 16:57:38 +0800 | [diff] [blame] | 164 | bsc_schedule_timer(&bsc->pong_timeout, bsc->nat->pong_timeout, 0); |
Holger Hans Peter Freyther | 582511a | 2010-05-02 19:28:59 +0800 | [diff] [blame] | 165 | } |
| 166 | |
| 167 | static void start_ping_pong(struct bsc_connection *bsc) |
| 168 | { |
| 169 | bsc->pong_timeout.data = bsc; |
| 170 | bsc->pong_timeout.cb = bsc_pong_timeout; |
| 171 | bsc->ping_timeout.data = bsc; |
| 172 | bsc->ping_timeout.cb = bsc_ping_timeout; |
| 173 | |
| 174 | bsc_ping_timeout(bsc); |
| 175 | } |
| 176 | |
Holger Hans Peter Freyther | 2ec5517 | 2010-03-26 09:18:02 +0100 | [diff] [blame] | 177 | static void send_id_ack(struct bsc_connection *bsc) |
Holger Hans Peter Freyther | 809d6fa | 2010-03-26 07:41:54 +0100 | [diff] [blame] | 178 | { |
Holger Hans Peter Freyther | 0b77635 | 2010-07-23 19:08:55 +0800 | [diff] [blame] | 179 | static const uint8_t id_ack[] = { |
Holger Hans Peter Freyther | eb4edde | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 180 | IPAC_MSGT_ID_ACK |
Holger Hans Peter Freyther | 809d6fa | 2010-03-26 07:41:54 +0100 | [diff] [blame] | 181 | }; |
| 182 | |
Holger Hans Peter Freyther | eb4edde | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 183 | bsc_send_data(bsc, id_ack, sizeof(id_ack), IPAC_PROTO_IPACCESS); |
Holger Hans Peter Freyther | 809d6fa | 2010-03-26 07:41:54 +0100 | [diff] [blame] | 184 | } |
| 185 | |
Holger Hans Peter Freyther | 2ec5517 | 2010-03-26 09:18:02 +0100 | [diff] [blame] | 186 | static void send_id_req(struct bsc_connection *bsc) |
Holger Hans Peter Freyther | 809d6fa | 2010-03-26 07:41:54 +0100 | [diff] [blame] | 187 | { |
Holger Hans Peter Freyther | 0b77635 | 2010-07-23 19:08:55 +0800 | [diff] [blame] | 188 | static const uint8_t id_req[] = { |
Holger Hans Peter Freyther | eb4edde | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 189 | IPAC_MSGT_ID_GET, |
Holger Hans Peter Freyther | 809d6fa | 2010-03-26 07:41:54 +0100 | [diff] [blame] | 190 | 0x01, IPAC_IDTAG_UNIT, |
| 191 | 0x01, IPAC_IDTAG_MACADDR, |
| 192 | 0x01, IPAC_IDTAG_LOCATION1, |
| 193 | 0x01, IPAC_IDTAG_LOCATION2, |
| 194 | 0x01, IPAC_IDTAG_EQUIPVERS, |
| 195 | 0x01, IPAC_IDTAG_SWVERSION, |
| 196 | 0x01, IPAC_IDTAG_UNITNAME, |
| 197 | 0x01, IPAC_IDTAG_SERNR, |
| 198 | }; |
| 199 | |
Holger Hans Peter Freyther | eb4edde | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 200 | bsc_send_data(bsc, id_req, sizeof(id_req), IPAC_PROTO_IPACCESS); |
Holger Hans Peter Freyther | 809d6fa | 2010-03-26 07:41:54 +0100 | [diff] [blame] | 201 | } |
| 202 | |
Holger Hans Peter Freyther | 7746bd8 | 2010-04-06 17:32:58 +0200 | [diff] [blame] | 203 | static void nat_send_rlsd(struct sccp_connections *conn) |
| 204 | { |
| 205 | struct sccp_connection_released *rel; |
| 206 | struct msgb *msg; |
| 207 | |
| 208 | msg = msgb_alloc_headroom(4096, 128, "rlsd"); |
| 209 | if (!msg) { |
| 210 | LOGP(DNAT, LOGL_ERROR, "Failed to allocate clear command.\n"); |
| 211 | return; |
| 212 | } |
| 213 | |
| 214 | msg->l2h = msgb_put(msg, sizeof(*rel)); |
| 215 | rel = (struct sccp_connection_released *) msg->l2h; |
| 216 | rel->type = SCCP_MSG_TYPE_RLSD; |
| 217 | rel->release_cause = SCCP_RELEASE_CAUSE_SCCP_FAILURE; |
| 218 | rel->destination_local_reference = conn->remote_ref; |
| 219 | rel->source_local_reference = conn->patched_ref; |
| 220 | |
| 221 | ipaccess_prepend_header(msg, IPAC_PROTO_SCCP); |
| 222 | |
Holger Hans Peter Freyther | 6a2fe9a | 2010-07-05 13:58:40 +0800 | [diff] [blame] | 223 | queue_for_msc(conn->msc_con, msg); |
Holger Hans Peter Freyther | 7746bd8 | 2010-04-06 17:32:58 +0200 | [diff] [blame] | 224 | } |
| 225 | |
Holger Hans Peter Freyther | 6a2fe9a | 2010-07-05 13:58:40 +0800 | [diff] [blame] | 226 | static void nat_send_rlc(struct bsc_msc_connection *msc_con, |
| 227 | struct sccp_source_reference *src, |
Holger Hans Peter Freyther | cd922a1 | 2010-04-08 11:28:12 +0200 | [diff] [blame] | 228 | struct sccp_source_reference *dst) |
| 229 | { |
| 230 | struct sccp_connection_release_complete *rlc; |
| 231 | struct msgb *msg; |
| 232 | |
| 233 | msg = msgb_alloc_headroom(4096, 128, "rlc"); |
| 234 | if (!msg) { |
| 235 | LOGP(DNAT, LOGL_ERROR, "Failed to allocate clear command.\n"); |
| 236 | return; |
| 237 | } |
| 238 | |
| 239 | msg->l2h = msgb_put(msg, sizeof(*rlc)); |
| 240 | rlc = (struct sccp_connection_release_complete *) msg->l2h; |
| 241 | rlc->type = SCCP_MSG_TYPE_RLC; |
| 242 | rlc->destination_local_reference = *dst; |
| 243 | rlc->source_local_reference = *src; |
| 244 | |
| 245 | ipaccess_prepend_header(msg, IPAC_PROTO_SCCP); |
| 246 | |
Holger Hans Peter Freyther | 6a2fe9a | 2010-07-05 13:58:40 +0800 | [diff] [blame] | 247 | queue_for_msc(msc_con, msg); |
Holger Hans Peter Freyther | cd922a1 | 2010-04-08 11:28:12 +0200 | [diff] [blame] | 248 | } |
| 249 | |
Holger Hans Peter Freyther | 8c61cdb | 2010-03-31 07:30:58 +0200 | [diff] [blame] | 250 | static void send_mgcp_reset(struct bsc_connection *bsc) |
| 251 | { |
Holger Hans Peter Freyther | 0b77635 | 2010-07-23 19:08:55 +0800 | [diff] [blame] | 252 | static const uint8_t mgcp_reset[] = { |
Holger Hans Peter Freyther | 8c61cdb | 2010-03-31 07:30:58 +0200 | [diff] [blame] | 253 | "RSIP 1 13@mgw MGCP 1.0\r\n" |
| 254 | }; |
| 255 | |
| 256 | bsc_write_mgcp(bsc, mgcp_reset, sizeof mgcp_reset - 1); |
| 257 | } |
| 258 | |
Holger Hans Peter Freyther | e907cb2 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 259 | /* |
| 260 | * Below is the handling of messages coming |
| 261 | * from the MSC and need to be forwarded to |
| 262 | * a real BSC. |
| 263 | */ |
Holger Hans Peter Freyther | 8fd9775 | 2010-07-05 14:14:18 +0800 | [diff] [blame] | 264 | static void initialize_msc_if_needed(struct bsc_msc_connection *msc_con) |
Holger Hans Peter Freyther | e907cb2 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 265 | { |
Holger Hans Peter Freyther | 8fd9775 | 2010-07-05 14:14:18 +0800 | [diff] [blame] | 266 | if (msc_con->first_contact) |
Holger Hans Peter Freyther | dc81393 | 2010-04-07 11:20:36 +0200 | [diff] [blame] | 267 | return; |
Holger Hans Peter Freyther | e907cb2 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 268 | |
Holger Hans Peter Freyther | 8fd9775 | 2010-07-05 14:14:18 +0800 | [diff] [blame] | 269 | msc_con->first_contact = 1; |
| 270 | msc_send_reset(msc_con); |
Holger Hans Peter Freyther | e907cb2 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 271 | } |
| 272 | |
Holger Hans Peter Freyther | 6a2fe9a | 2010-07-05 13:58:40 +0800 | [diff] [blame] | 273 | static void send_id_get_response(struct bsc_msc_connection *msc_con) |
Holger Hans Peter Freyther | 6e88b17 | 2010-05-15 00:14:58 +0800 | [diff] [blame] | 274 | { |
| 275 | struct msgb *msg = bsc_msc_id_get_resp(nat->token); |
| 276 | if (!msg) |
| 277 | return; |
| 278 | |
| 279 | ipaccess_prepend_header(msg, IPAC_PROTO_IPACCESS); |
Holger Hans Peter Freyther | 6a2fe9a | 2010-07-05 13:58:40 +0800 | [diff] [blame] | 280 | queue_for_msc(msc_con, msg); |
Holger Hans Peter Freyther | 6e88b17 | 2010-05-15 00:14:58 +0800 | [diff] [blame] | 281 | } |
| 282 | |
Holger Hans Peter Freyther | 2ec5517 | 2010-03-26 09:18:02 +0100 | [diff] [blame] | 283 | /* |
| 284 | * Currently we are lacking refcounting so we need to copy each message. |
| 285 | */ |
Holger Hans Peter Freyther | 0b77635 | 2010-07-23 19:08:55 +0800 | [diff] [blame] | 286 | static void bsc_send_data(struct bsc_connection *bsc, const uint8_t *data, unsigned int length, int proto) |
Holger Hans Peter Freyther | ad2136b | 2010-03-26 07:20:59 +0100 | [diff] [blame] | 287 | { |
Holger Hans Peter Freyther | 2ec5517 | 2010-03-26 09:18:02 +0100 | [diff] [blame] | 288 | struct msgb *msg; |
| 289 | |
Holger Hans Peter Freyther | eb4edde | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 290 | if (length > 4096 - 128) { |
Holger Hans Peter Freyther | 2ec5517 | 2010-03-26 09:18:02 +0100 | [diff] [blame] | 291 | LOGP(DINP, LOGL_ERROR, "Can not send message of that size.\n"); |
| 292 | return; |
| 293 | } |
| 294 | |
Holger Hans Peter Freyther | eb4edde | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 295 | msg = msgb_alloc_headroom(4096, 128, "to-bsc"); |
Holger Hans Peter Freyther | 2ec5517 | 2010-03-26 09:18:02 +0100 | [diff] [blame] | 296 | if (!msg) { |
| 297 | LOGP(DINP, LOGL_ERROR, "Failed to allocate memory for BSC msg.\n"); |
| 298 | return; |
| 299 | } |
| 300 | |
Holger Hans Peter Freyther | eb4edde | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 301 | msg->l2h = msgb_put(msg, length); |
Holger Hans Peter Freyther | 2ec5517 | 2010-03-26 09:18:02 +0100 | [diff] [blame] | 302 | memcpy(msg->data, data, length); |
Holger Hans Peter Freyther | eb4edde | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 303 | |
| 304 | bsc_write(bsc, msg, proto); |
Holger Hans Peter Freyther | ad2136b | 2010-03-26 07:20:59 +0100 | [diff] [blame] | 305 | } |
| 306 | |
Holger Hans Peter Freyther | a8f092d | 2010-09-15 07:43:59 +0800 | [diff] [blame] | 307 | /* |
| 308 | * Release an established connection. We will have to release it to the BSC |
| 309 | * and to the network and we do it the following way. |
| 310 | * 1.) Give up on the MSC side |
| 311 | * 1.1) Send a RLSD message, it is a bit non standard but should work, we |
| 312 | * ignore the RLC... we might complain about it. Other options would |
| 313 | * be to send a Release Request, handle the Release Complete.. |
| 314 | * 1.2) Mark the data structure to be con_local and wait for 2nd |
| 315 | * |
| 316 | * 2.) Give up on the BSC side |
| 317 | * 2.1) Depending on the con type reject the service, or just close it |
| 318 | */ |
| 319 | static void bsc_send_con_release(struct bsc_connection *bsc, struct sccp_connections *con) |
| 320 | { |
| 321 | struct msgb *rlsd; |
| 322 | /* 1. release the network */ |
| 323 | rlsd = sccp_create_rlsd(&con->patched_ref, &con->remote_ref, |
| 324 | SCCP_RELEASE_CAUSE_END_USER_ORIGINATED); |
| 325 | if (!rlsd) |
| 326 | LOGP(DNAT, LOGL_ERROR, "Failed to create RLSD message.\n"); |
| 327 | else { |
| 328 | ipaccess_prepend_header(rlsd, IPAC_PROTO_SCCP); |
| 329 | queue_for_msc(con->msc_con, rlsd); |
| 330 | } |
| 331 | con->con_local = 1; |
Holger Hans Peter Freyther | b2b66c2 | 2010-09-16 06:41:09 +0800 | [diff] [blame] | 332 | con->msc_con = NULL; |
Holger Hans Peter Freyther | a8f092d | 2010-09-15 07:43:59 +0800 | [diff] [blame] | 333 | |
| 334 | /* 2. release the BSC side */ |
| 335 | if (con->con_type == NAT_CON_TYPE_LU) { |
| 336 | struct msgb *payload, *udt; |
| 337 | payload = gsm48_create_loc_upd_rej(GSM48_REJECT_PLMN_NOT_ALLOWED); |
| 338 | |
| 339 | if (payload) { |
| 340 | gsm0808_prepend_dtap_header(payload, 0); |
| 341 | udt = sccp_create_dt1(&con->real_ref, payload->data, payload->len); |
| 342 | if (udt) |
| 343 | bsc_write(bsc, udt, IPAC_PROTO_SCCP); |
| 344 | else |
| 345 | LOGP(DNAT, LOGL_ERROR, "Failed to create DT1\n"); |
| 346 | |
| 347 | msgb_free(payload); |
| 348 | } else { |
| 349 | LOGP(DNAT, LOGL_ERROR, "Failed to allocate LU Reject.\n"); |
| 350 | } |
| 351 | } |
| 352 | |
| 353 | rlsd = sccp_create_rlsd(&con->remote_ref, &con->real_ref, |
| 354 | SCCP_RELEASE_CAUSE_END_USER_ORIGINATED); |
| 355 | if (!rlsd) { |
| 356 | LOGP(DNAT, LOGL_ERROR, "Failed to allocate RLSD for the BSC.\n"); |
| 357 | sccp_connection_destroy(con); |
| 358 | return; |
| 359 | } |
| 360 | |
| 361 | con->con_type = NAT_CON_TYPE_LOCAL_REJECT; |
| 362 | bsc_write(bsc, rlsd, IPAC_PROTO_SCCP); |
| 363 | } |
| 364 | |
Holger Hans Peter Freyther | fa412e5 | 2010-05-16 02:20:26 +0800 | [diff] [blame] | 365 | static void bsc_send_con_refuse(struct bsc_connection *bsc, |
| 366 | struct bsc_nat_parsed *parsed, int con_type) |
| 367 | { |
Holger Hans Peter Freyther | 605eba7 | 2010-06-15 18:52:24 +0800 | [diff] [blame] | 368 | struct msgb *payload; |
Holger Hans Peter Freyther | fa412e5 | 2010-05-16 02:20:26 +0800 | [diff] [blame] | 369 | struct msgb *refuse; |
Holger Hans Peter Freyther | 605eba7 | 2010-06-15 18:52:24 +0800 | [diff] [blame] | 370 | |
Holger Hans Peter Freyther | 15a1f99 | 2010-05-16 20:43:52 +0800 | [diff] [blame] | 371 | if (con_type == NAT_CON_TYPE_LU) |
Holger Hans Peter Freyther | 605eba7 | 2010-06-15 18:52:24 +0800 | [diff] [blame] | 372 | payload = gsm48_create_loc_upd_rej(GSM48_REJECT_PLMN_NOT_ALLOWED); |
Holger Hans Peter Freyther | 15a1f99 | 2010-05-16 20:43:52 +0800 | [diff] [blame] | 373 | else if (con_type == NAT_CON_TYPE_CM_SERV_REQ) |
Holger Hans Peter Freyther | 605eba7 | 2010-06-15 18:52:24 +0800 | [diff] [blame] | 374 | payload = gsm48_create_mm_serv_rej(GSM48_REJECT_PLMN_NOT_ALLOWED); |
Holger Hans Peter Freyther | a624c53 | 2010-07-23 19:43:12 +0800 | [diff] [blame] | 375 | else { |
| 376 | LOGP(DNAT, LOGL_ERROR, "Unknown connection type: %d\n", con_type); |
| 377 | payload = NULL; |
| 378 | } |
Holger Hans Peter Freyther | 15a1f99 | 2010-05-16 20:43:52 +0800 | [diff] [blame] | 379 | |
| 380 | /* |
| 381 | * Some BSCs do not handle the payload inside a SCCP CREF msg |
| 382 | * so we will need to: |
| 383 | * 1.) Allocate a local connection and mark it as local.. |
| 384 | * 2.) queue data for downstream.. and the RLC should delete everything |
| 385 | */ |
| 386 | if (payload) { |
| 387 | struct msgb *cc, *udt, *rlsd; |
| 388 | struct sccp_connections *con; |
| 389 | con = create_sccp_src_ref(bsc, parsed); |
| 390 | if (!con) |
| 391 | goto send_refuse; |
| 392 | |
| 393 | /* declare it local and assign a unique remote_ref */ |
| 394 | con->con_type = NAT_CON_TYPE_LOCAL_REJECT; |
| 395 | con->con_local = 1; |
| 396 | con->has_remote_ref = 1; |
| 397 | con->remote_ref = con->patched_ref; |
| 398 | |
| 399 | /* 1. create a confirmation */ |
| 400 | cc = sccp_create_cc(&con->remote_ref, &con->real_ref); |
| 401 | if (!cc) |
| 402 | goto send_refuse; |
| 403 | |
| 404 | /* 2. create the DT1 */ |
Holger Hans Peter Freyther | 605eba7 | 2010-06-15 18:52:24 +0800 | [diff] [blame] | 405 | gsm0808_prepend_dtap_header(payload, 0); |
Holger Hans Peter Freyther | 15a1f99 | 2010-05-16 20:43:52 +0800 | [diff] [blame] | 406 | udt = sccp_create_dt1(&con->real_ref, payload->data, payload->len); |
| 407 | if (!udt) { |
| 408 | msgb_free(cc); |
| 409 | goto send_refuse; |
| 410 | } |
| 411 | |
| 412 | /* 3. send a RLSD */ |
| 413 | rlsd = sccp_create_rlsd(&con->remote_ref, &con->real_ref, |
| 414 | SCCP_RELEASE_CAUSE_END_USER_ORIGINATED); |
| 415 | if (!rlsd) { |
| 416 | msgb_free(cc); |
| 417 | msgb_free(udt); |
| 418 | goto send_refuse; |
| 419 | } |
| 420 | |
| 421 | bsc_write(bsc, cc, IPAC_PROTO_SCCP); |
| 422 | bsc_write(bsc, udt, IPAC_PROTO_SCCP); |
| 423 | bsc_write(bsc, rlsd, IPAC_PROTO_SCCP); |
| 424 | msgb_free(payload); |
| 425 | return; |
Holger Hans Peter Freyther | 605eba7 | 2010-06-15 18:52:24 +0800 | [diff] [blame] | 426 | } |
| 427 | |
Holger Hans Peter Freyther | 605eba7 | 2010-06-15 18:52:24 +0800 | [diff] [blame] | 428 | |
Holger Hans Peter Freyther | 15a1f99 | 2010-05-16 20:43:52 +0800 | [diff] [blame] | 429 | send_refuse: |
Holger Hans Peter Freyther | 605eba7 | 2010-06-15 18:52:24 +0800 | [diff] [blame] | 430 | if (payload) |
| 431 | msgb_free(payload); |
| 432 | |
Holger Hans Peter Freyther | 15a1f99 | 2010-05-16 20:43:52 +0800 | [diff] [blame] | 433 | refuse = sccp_create_refuse(parsed->src_local_ref, |
| 434 | SCCP_REFUSAL_SCCP_FAILURE, NULL, 0); |
Holger Hans Peter Freyther | fa412e5 | 2010-05-16 02:20:26 +0800 | [diff] [blame] | 435 | if (!refuse) { |
| 436 | LOGP(DNAT, LOGL_ERROR, |
| 437 | "Creating refuse msg failed for SCCP 0x%x on BSC Nr: %d.\n", |
| 438 | sccp_src_ref_to_int(parsed->src_local_ref), bsc->cfg->nr); |
| 439 | return; |
| 440 | } |
| 441 | |
| 442 | bsc_write(bsc, refuse, IPAC_PROTO_SCCP); |
| 443 | } |
| 444 | |
| 445 | |
Holger Hans Peter Freyther | 6a2fe9a | 2010-07-05 13:58:40 +0800 | [diff] [blame] | 446 | static int forward_sccp_to_bts(struct bsc_msc_connection *msc_con, struct msgb *msg) |
Holger Hans Peter Freyther | e907cb2 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 447 | { |
Holger Hans Peter Freyther | a624c53 | 2010-07-23 19:43:12 +0800 | [diff] [blame] | 448 | struct sccp_connections *con = NULL; |
Holger Hans Peter Freyther | 75ee841 | 2010-06-15 18:48:55 +0800 | [diff] [blame] | 449 | struct bsc_connection *bsc; |
Holger Hans Peter Freyther | f75a680 | 2010-06-15 18:45:38 +0800 | [diff] [blame] | 450 | struct bsc_nat_parsed *parsed; |
Holger Hans Peter Freyther | eb4edde | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 451 | int proto; |
Holger Hans Peter Freyther | 4a62960 | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 452 | |
Holger Hans Peter Freyther | e907cb2 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 453 | /* filter, drop, patch the message? */ |
Holger Hans Peter Freyther | f75a680 | 2010-06-15 18:45:38 +0800 | [diff] [blame] | 454 | parsed = bsc_nat_parse(msg); |
| 455 | if (!parsed) { |
| 456 | LOGP(DNAT, LOGL_ERROR, "Can not parse msg from BSC.\n"); |
Holger Hans Peter Freyther | e83917d | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 457 | return -1; |
Holger Hans Peter Freyther | f75a680 | 2010-06-15 18:45:38 +0800 | [diff] [blame] | 458 | } |
| 459 | |
Holger Hans Peter Freyther | bbf6b65 | 2010-01-30 11:53:30 +0100 | [diff] [blame] | 460 | if (bsc_nat_filter_ipa(DIR_BSC, msg, parsed)) |
Holger Hans Peter Freyther | f75a680 | 2010-06-15 18:45:38 +0800 | [diff] [blame] | 461 | goto exit; |
Holger Hans Peter Freyther | 57adba5 | 2010-06-15 18:45:26 +0800 | [diff] [blame] | 462 | |
Holger Hans Peter Freyther | eb4edde | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 463 | proto = parsed->ipa_proto; |
| 464 | |
Holger Hans Peter Freyther | e83917d | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 465 | /* Route and modify the SCCP packet */ |
Holger Hans Peter Freyther | eb4edde | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 466 | if (proto == IPAC_PROTO_SCCP) { |
Holger Hans Peter Freyther | e83917d | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 467 | switch (parsed->sccp_type) { |
| 468 | case SCCP_MSG_TYPE_UDT: |
| 469 | /* forward UDT messages to every BSC */ |
| 470 | goto send_to_all; |
| 471 | break; |
| 472 | case SCCP_MSG_TYPE_RLSD: |
| 473 | case SCCP_MSG_TYPE_CREF: |
| 474 | case SCCP_MSG_TYPE_DT1: |
Holger Hans Peter Freyther | 567e840 | 2010-04-06 10:22:34 +0200 | [diff] [blame] | 475 | case SCCP_MSG_TYPE_IT: |
Holger Hans Peter Freyther | 75ee841 | 2010-06-15 18:48:55 +0800 | [diff] [blame] | 476 | con = patch_sccp_src_ref_to_bsc(msg, parsed, nat); |
Holger Hans Peter Freyther | dccb915 | 2010-06-15 18:49:53 +0800 | [diff] [blame] | 477 | if (parsed->gsm_type == BSS_MAP_MSG_ASSIGMENT_RQST) { |
Holger Hans Peter Freyther | 5fa42dd | 2010-04-12 12:17:09 +0200 | [diff] [blame] | 478 | counter_inc(nat->stats.sccp.calls); |
| 479 | |
Holger Hans Peter Freyther | dccb915 | 2010-06-15 18:49:53 +0800 | [diff] [blame] | 480 | if (con) { |
Holger Hans Peter Freyther | ccefba6 | 2010-06-17 18:16:00 +0800 | [diff] [blame] | 481 | struct rate_ctr_group *ctrg; |
| 482 | ctrg = con->bsc->cfg->stats.ctrg; |
| 483 | rate_ctr_inc(&ctrg->ctr[BCFG_CTR_SCCP_CALLS]); |
Holger Hans Peter Freyther | 926c5fd | 2010-08-28 18:22:14 +0800 | [diff] [blame] | 484 | if (bsc_mgcp_assign_patch(con, msg) != 0) |
Holger Hans Peter Freyther | dccb915 | 2010-06-15 18:49:53 +0800 | [diff] [blame] | 485 | LOGP(DNAT, LOGL_ERROR, "Failed to assign...\n"); |
| 486 | } else |
| 487 | LOGP(DNAT, LOGL_ERROR, "Assignment command but no BSC.\n"); |
| 488 | } |
Holger Hans Peter Freyther | a25e3ec | 2010-03-29 17:18:42 +0200 | [diff] [blame] | 489 | break; |
Holger Hans Peter Freyther | e83917d | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 490 | case SCCP_MSG_TYPE_CC: |
Holger Hans Peter Freyther | 75ee841 | 2010-06-15 18:48:55 +0800 | [diff] [blame] | 491 | con = patch_sccp_src_ref_to_bsc(msg, parsed, nat); |
| 492 | if (!con || update_sccp_src_ref(con, parsed) != 0) |
Holger Hans Peter Freyther | a25e3ec | 2010-03-29 17:18:42 +0200 | [diff] [blame] | 493 | goto exit; |
Holger Hans Peter Freyther | 2f1f55d | 2010-06-15 18:47:49 +0800 | [diff] [blame] | 494 | break; |
| 495 | case SCCP_MSG_TYPE_RLC: |
| 496 | LOGP(DNAT, LOGL_ERROR, "Unexpected release complete from MSC.\n"); |
| 497 | goto exit; |
Holger Hans Peter Freyther | e83917d | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 498 | break; |
| 499 | case SCCP_MSG_TYPE_CR: |
Holger Hans Peter Freyther | e83917d | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 500 | /* MSC never opens a SCCP connection, fall through */ |
| 501 | default: |
| 502 | goto exit; |
| 503 | } |
Holger Hans Peter Freyther | 8d29828 | 2010-04-06 16:07:44 +0200 | [diff] [blame] | 504 | |
Holger Hans Peter Freyther | cd922a1 | 2010-04-08 11:28:12 +0200 | [diff] [blame] | 505 | if (!con && parsed->sccp_type == SCCP_MSG_TYPE_RLSD) { |
| 506 | LOGP(DNAT, LOGL_NOTICE, "Sending fake RLC on RLSD message to network.\n"); |
| 507 | /* Exchange src/dest for the reply */ |
Holger Hans Peter Freyther | 6a2fe9a | 2010-07-05 13:58:40 +0800 | [diff] [blame] | 508 | nat_send_rlc(msc_con, parsed->dest_local_ref, parsed->src_local_ref); |
Holger Hans Peter Freyther | cd922a1 | 2010-04-08 11:28:12 +0200 | [diff] [blame] | 509 | } else if (!con) |
Holger Hans Peter Freyther | 117e7a7 | 2010-05-15 19:13:52 +0800 | [diff] [blame] | 510 | LOGP(DNAT, LOGL_ERROR, "Unknown connection for msg type: 0x%x from the MSC.\n", parsed->sccp_type); |
Holger Hans Peter Freyther | e83917d | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 511 | } |
| 512 | |
| 513 | talloc_free(parsed); |
Holger Hans Peter Freyther | 75ee841 | 2010-06-15 18:48:55 +0800 | [diff] [blame] | 514 | if (!con) |
Holger Hans Peter Freyther | e83917d | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 515 | return -1; |
Holger Hans Peter Freyther | 75ee841 | 2010-06-15 18:48:55 +0800 | [diff] [blame] | 516 | if (!con->bsc->authenticated) { |
Holger Hans Peter Freyther | 3b96089 | 2010-06-15 19:06:18 +0800 | [diff] [blame] | 517 | LOGP(DNAT, LOGL_ERROR, "Selected BSC not authenticated.\n"); |
Holger Hans Peter Freyther | fb5a487 | 2010-02-08 23:24:32 +0100 | [diff] [blame] | 518 | return -1; |
| 519 | } |
| 520 | |
Holger Hans Peter Freyther | eb4edde | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 521 | bsc_send_data(con->bsc, msg->l2h, msgb_l2len(msg), proto); |
Holger Hans Peter Freyther | 2ec5517 | 2010-03-26 09:18:02 +0100 | [diff] [blame] | 522 | return 0; |
Holger Hans Peter Freyther | e83917d | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 523 | |
| 524 | send_to_all: |
Holger Hans Peter Freyther | fd2c757 | 2010-06-15 18:46:36 +0800 | [diff] [blame] | 525 | /* |
| 526 | * Filter Paging from the network. We do not want to send a PAGING |
| 527 | * Command to every BSC in our network. We will analys the PAGING |
| 528 | * message and then send it to the authenticated messages... |
| 529 | */ |
| 530 | if (parsed->ipa_proto == IPAC_PROTO_SCCP && parsed->gsm_type == BSS_MAP_MSG_PAGING) { |
Holger Hans Peter Freyther | 935b2df | 2010-04-17 08:07:19 +0200 | [diff] [blame] | 531 | int lac; |
| 532 | bsc = bsc_nat_find_bsc(nat, msg, &lac); |
Holger Hans Peter Freyther | 7acf462 | 2010-04-21 19:05:14 +0800 | [diff] [blame] | 533 | if (bsc && bsc->cfg->forbid_paging) |
Holger Hans Peter Freyther | 19ccb48 | 2010-04-21 20:17:18 +0800 | [diff] [blame] | 534 | LOGP(DNAT, LOGL_DEBUG, "Paging forbidden for BTS: %d\n", bsc->cfg->nr); |
Holger Hans Peter Freyther | 7acf462 | 2010-04-21 19:05:14 +0800 | [diff] [blame] | 535 | else if (bsc) |
Holger Hans Peter Freyther | eb4edde | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 536 | bsc_send_data(bsc, msg->l2h, msgb_l2len(msg), parsed->ipa_proto); |
Holger Hans Peter Freyther | e0ca9d2 | 2010-08-06 20:15:40 +0800 | [diff] [blame] | 537 | else if (lac != -1) |
Holger Hans Peter Freyther | 935b2df | 2010-04-17 08:07:19 +0200 | [diff] [blame] | 538 | LOGP(DNAT, LOGL_ERROR, "Could not determine BSC for paging on lac: %d/0x%x\n", |
| 539 | lac, lac); |
Holger Hans Peter Freyther | fd2c757 | 2010-06-15 18:46:36 +0800 | [diff] [blame] | 540 | |
| 541 | goto exit; |
| 542 | } |
Holger Hans Peter Freyther | 4a62960 | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 543 | /* currently send this to every BSC connected */ |
Holger Hans Peter Freyther | 5e54788 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 544 | llist_for_each_entry(bsc, &nat->bsc_connections, list_entry) { |
Holger Hans Peter Freyther | fb5a487 | 2010-02-08 23:24:32 +0100 | [diff] [blame] | 545 | if (!bsc->authenticated) |
| 546 | continue; |
| 547 | |
Holger Hans Peter Freyther | eb4edde | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 548 | bsc_send_data(bsc, msg->l2h, msgb_l2len(msg), parsed->ipa_proto); |
Holger Hans Peter Freyther | 4a62960 | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 549 | } |
Holger Hans Peter Freyther | f75a680 | 2010-06-15 18:45:38 +0800 | [diff] [blame] | 550 | |
| 551 | exit: |
| 552 | talloc_free(parsed); |
Holger Hans Peter Freyther | e83917d | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 553 | return 0; |
Holger Hans Peter Freyther | e907cb2 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 554 | } |
| 555 | |
Holger Hans Peter Freyther | 4a860a0 | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 556 | static void msc_connection_was_lost(struct bsc_msc_connection *con) |
| 557 | { |
Holger Hans Peter Freyther | 3399df3 | 2010-03-29 08:04:09 +0200 | [diff] [blame] | 558 | struct bsc_connection *bsc, *tmp; |
| 559 | |
| 560 | LOGP(DMSC, LOGL_ERROR, "Closing all connections downstream.\n"); |
| 561 | llist_for_each_entry_safe(bsc, tmp, &nat->bsc_connections, list_entry) |
Holger Hans Peter Freyther | 1512dc2 | 2010-04-27 13:21:39 +0800 | [diff] [blame] | 562 | bsc_close_connection(bsc); |
Holger Hans Peter Freyther | 3399df3 | 2010-03-29 08:04:09 +0200 | [diff] [blame] | 563 | |
Holger Hans Peter Freyther | 1f27839 | 2010-03-31 09:16:56 +0200 | [diff] [blame] | 564 | bsc_mgcp_free_endpoints(nat); |
Holger Hans Peter Freyther | 3399df3 | 2010-03-29 08:04:09 +0200 | [diff] [blame] | 565 | bsc_msc_schedule_connect(con); |
Holger Hans Peter Freyther | 4a860a0 | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 566 | } |
| 567 | |
Holger Hans Peter Freyther | 0cb4fd9 | 2010-08-04 02:31:55 +0800 | [diff] [blame] | 568 | static void msc_connection_connected(struct bsc_msc_connection *con) |
| 569 | { |
| 570 | counter_inc(nat->stats.msc.reconn); |
| 571 | } |
| 572 | |
Holger Hans Peter Freyther | 8f515a0 | 2010-04-08 10:31:07 +0200 | [diff] [blame] | 573 | static void msc_send_reset(struct bsc_msc_connection *msc_con) |
Holger Hans Peter Freyther | 2b3505b | 2010-04-07 10:46:30 +0200 | [diff] [blame] | 574 | { |
Holger Hans Peter Freyther | 0b77635 | 2010-07-23 19:08:55 +0800 | [diff] [blame] | 575 | static const uint8_t reset[] = { |
Holger Hans Peter Freyther | c48a5d9 | 2010-04-07 11:11:11 +0200 | [diff] [blame] | 576 | 0x00, 0x12, 0xfd, |
Holger Hans Peter Freyther | 2b3505b | 2010-04-07 10:46:30 +0200 | [diff] [blame] | 577 | 0x09, 0x00, 0x03, 0x05, 0x07, 0x02, 0x42, 0xfe, |
| 578 | 0x02, 0x42, 0xfe, 0x06, 0x00, 0x04, 0x30, 0x04, |
| 579 | 0x01, 0x20 |
| 580 | }; |
| 581 | |
| 582 | struct msgb *msg; |
| 583 | |
| 584 | msg = msgb_alloc_headroom(4096, 128, "08.08 reset"); |
| 585 | if (!msg) { |
| 586 | LOGP(DMSC, LOGL_ERROR, "Failed to allocate reset msg.\n"); |
| 587 | return; |
| 588 | } |
| 589 | |
| 590 | msg->l2h = msgb_put(msg, sizeof(reset)); |
| 591 | memcpy(msg->l2h, reset, msgb_l2len(msg)); |
| 592 | |
Holger Hans Peter Freyther | 6a2fe9a | 2010-07-05 13:58:40 +0800 | [diff] [blame] | 593 | queue_for_msc(msc_con, msg); |
Holger Hans Peter Freyther | 2b3505b | 2010-04-07 10:46:30 +0200 | [diff] [blame] | 594 | |
| 595 | LOGP(DMSC, LOGL_NOTICE, "Scheduled GSM0808 reset msg for the MSC.\n"); |
| 596 | } |
| 597 | |
Holger Hans Peter Freyther | 257a8cc | 2010-06-15 18:47:02 +0800 | [diff] [blame] | 598 | static int ipaccess_msc_read_cb(struct bsc_fd *bfd) |
Holger Hans Peter Freyther | e907cb2 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 599 | { |
| 600 | int error; |
Holger Hans Peter Freyther | 8fd9775 | 2010-07-05 14:14:18 +0800 | [diff] [blame] | 601 | struct bsc_msc_connection *msc_con; |
Holger Hans Peter Freyther | e907cb2 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 602 | struct msgb *msg = ipaccess_read_msg(bfd, &error); |
| 603 | struct ipaccess_head *hh; |
| 604 | |
Holger Hans Peter Freyther | 8fd9775 | 2010-07-05 14:14:18 +0800 | [diff] [blame] | 605 | msc_con = (struct bsc_msc_connection *) bfd->data; |
| 606 | |
Holger Hans Peter Freyther | e907cb2 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 607 | if (!msg) { |
Holger Hans Peter Freyther | bae6b8b | 2010-04-23 00:23:03 +0800 | [diff] [blame] | 608 | if (error == 0) |
Holger Hans Peter Freyther | 8f99b82 | 2010-01-29 05:58:43 +0100 | [diff] [blame] | 609 | LOGP(DNAT, LOGL_FATAL, "The connection the MSC was lost, exiting\n"); |
Holger Hans Peter Freyther | bae6b8b | 2010-04-23 00:23:03 +0800 | [diff] [blame] | 610 | else |
| 611 | LOGP(DNAT, LOGL_ERROR, "Failed to parse ip access message: %d\n", error); |
Holger Hans Peter Freyther | e907cb2 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 612 | |
Holger Hans Peter Freyther | 8fd9775 | 2010-07-05 14:14:18 +0800 | [diff] [blame] | 613 | bsc_msc_lost(msc_con); |
Holger Hans Peter Freyther | e907cb2 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 614 | return -1; |
| 615 | } |
| 616 | |
Holger Hans Peter Freyther | 8f99b82 | 2010-01-29 05:58:43 +0100 | [diff] [blame] | 617 | LOGP(DNAT, LOGL_DEBUG, "MSG from MSC: %s proto: %d\n", hexdump(msg->data, msg->len), msg->l2h[0]); |
Holger Hans Peter Freyther | e907cb2 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 618 | |
| 619 | /* handle base message handling */ |
| 620 | hh = (struct ipaccess_head *) msg->data; |
| 621 | ipaccess_rcvmsg_base(msg, bfd); |
| 622 | |
| 623 | /* initialize the networking. This includes sending a GSM08.08 message */ |
Holger Hans Peter Freyther | 6e88b17 | 2010-05-15 00:14:58 +0800 | [diff] [blame] | 624 | if (hh->proto == IPAC_PROTO_IPACCESS) { |
| 625 | if (msg->l2h[0] == IPAC_MSGT_ID_ACK) |
Holger Hans Peter Freyther | 8fd9775 | 2010-07-05 14:14:18 +0800 | [diff] [blame] | 626 | initialize_msc_if_needed(msc_con); |
Holger Hans Peter Freyther | 6e88b17 | 2010-05-15 00:14:58 +0800 | [diff] [blame] | 627 | else if (msg->l2h[0] == IPAC_MSGT_ID_GET) |
Holger Hans Peter Freyther | 8fd9775 | 2010-07-05 14:14:18 +0800 | [diff] [blame] | 628 | send_id_get_response(msc_con); |
Holger Hans Peter Freyther | 6e88b17 | 2010-05-15 00:14:58 +0800 | [diff] [blame] | 629 | } else if (hh->proto == IPAC_PROTO_SCCP) |
Holger Hans Peter Freyther | 8fd9775 | 2010-07-05 14:14:18 +0800 | [diff] [blame] | 630 | forward_sccp_to_bts(msc_con, msg); |
Holger Hans Peter Freyther | e907cb2 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 631 | |
Holger Hans Peter Freyther | 418fe11 | 2010-06-15 18:46:48 +0800 | [diff] [blame] | 632 | msgb_free(msg); |
Holger Hans Peter Freyther | e907cb2 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 633 | return 0; |
| 634 | } |
Holger Hans Peter Freyther | 89d9fd9 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 635 | |
Holger Hans Peter Freyther | 257a8cc | 2010-06-15 18:47:02 +0800 | [diff] [blame] | 636 | static int ipaccess_msc_write_cb(struct bsc_fd *bfd, struct msgb *msg) |
| 637 | { |
| 638 | int rc; |
| 639 | rc = write(bfd->fd, msg->data, msg->len); |
| 640 | |
| 641 | if (rc != msg->len) { |
| 642 | LOGP(DNAT, LOGL_ERROR, "Failed to write MSG to MSC.\n"); |
| 643 | return -1; |
| 644 | } |
| 645 | |
| 646 | return rc; |
| 647 | } |
| 648 | |
Holger Hans Peter Freyther | e8fa0f1 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 649 | /* |
| 650 | * Below is the handling of messages coming |
| 651 | * from the BSC and need to be forwarded to |
| 652 | * a real BSC. |
| 653 | */ |
Holger Hans Peter Freyther | 4a62960 | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 654 | |
| 655 | /* |
| 656 | * Remove the connection from the connections list, |
| 657 | * remove it from the patching of SCCP header lists |
| 658 | * as well. Maybe in the future even close connection.. |
| 659 | */ |
Holger Hans Peter Freyther | 1512dc2 | 2010-04-27 13:21:39 +0800 | [diff] [blame] | 660 | void bsc_close_connection(struct bsc_connection *connection) |
Holger Hans Peter Freyther | 4a62960 | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 661 | { |
Holger Hans Peter Freyther | e83917d | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 662 | struct sccp_connections *sccp_patch, *tmp; |
Holger Hans Peter Freyther | 3357a7b | 2010-06-17 18:29:42 +0800 | [diff] [blame] | 663 | struct rate_ctr *ctr = NULL; |
Holger Hans Peter Freyther | e83917d | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 664 | |
Holger Hans Peter Freyther | de55766 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 665 | /* stop the timeout timer */ |
| 666 | bsc_del_timer(&connection->id_timeout); |
Holger Hans Peter Freyther | 582511a | 2010-05-02 19:28:59 +0800 | [diff] [blame] | 667 | bsc_del_timer(&connection->ping_timeout); |
| 668 | bsc_del_timer(&connection->pong_timeout); |
Holger Hans Peter Freyther | de55766 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 669 | |
Holger Hans Peter Freyther | 3357a7b | 2010-06-17 18:29:42 +0800 | [diff] [blame] | 670 | if (connection->cfg) |
| 671 | ctr = &connection->cfg->stats.ctrg->ctr[BCFG_CTR_DROPPED_SCCP]; |
| 672 | |
Holger Hans Peter Freyther | e83917d | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 673 | /* remove all SCCP connections */ |
Holger Hans Peter Freyther | 5e54788 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 674 | llist_for_each_entry_safe(sccp_patch, tmp, &nat->sccp_connections, list_entry) { |
Holger Hans Peter Freyther | e83917d | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 675 | if (sccp_patch->bsc != connection) |
| 676 | continue; |
| 677 | |
Holger Hans Peter Freyther | 3357a7b | 2010-06-17 18:29:42 +0800 | [diff] [blame] | 678 | if (ctr) |
| 679 | rate_ctr_inc(ctr); |
Holger Hans Peter Freyther | b2b66c2 | 2010-09-16 06:41:09 +0800 | [diff] [blame] | 680 | if (sccp_patch->has_remote_ref && !sccp_patch->con_local) |
Holger Hans Peter Freyther | 5975c68 | 2010-04-23 14:13:27 +0800 | [diff] [blame] | 681 | nat_send_rlsd(sccp_patch); |
Holger Hans Peter Freyther | 8be49b3 | 2010-03-30 10:45:48 +0200 | [diff] [blame] | 682 | sccp_connection_destroy(sccp_patch); |
Holger Hans Peter Freyther | e83917d | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 683 | } |
| 684 | |
Holger Hans Peter Freyther | c0ff1d0 | 2010-04-05 23:09:27 +0200 | [diff] [blame] | 685 | /* close endpoints allocated by this BSC */ |
| 686 | bsc_mgcp_clear_endpoints_for(connection); |
| 687 | |
Holger Hans Peter Freyther | 53cd985 | 2010-04-22 12:04:36 +0800 | [diff] [blame] | 688 | bsc_unregister_fd(&connection->write_queue.bfd); |
| 689 | close(connection->write_queue.bfd.fd); |
| 690 | write_queue_clear(&connection->write_queue); |
| 691 | llist_del(&connection->list_entry); |
| 692 | |
Holger Hans Peter Freyther | 4a62960 | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 693 | talloc_free(connection); |
| 694 | } |
| 695 | |
Holger Hans Peter Freyther | de55766 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 696 | static void ipaccess_close_bsc(void *data) |
| 697 | { |
Holger Hans Peter Freyther | 3626e97 | 2010-04-17 07:58:17 +0200 | [diff] [blame] | 698 | struct sockaddr_in sock; |
| 699 | socklen_t len = sizeof(sock); |
Holger Hans Peter Freyther | de55766 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 700 | struct bsc_connection *conn = data; |
| 701 | |
Holger Hans Peter Freyther | 3626e97 | 2010-04-17 07:58:17 +0200 | [diff] [blame] | 702 | |
| 703 | getpeername(conn->write_queue.bfd.fd, (struct sockaddr *) &sock, &len); |
| 704 | LOGP(DNAT, LOGL_ERROR, "BSC on %s didn't respond to identity request. Closing.\n", |
| 705 | inet_ntoa(sock.sin_addr)); |
Holger Hans Peter Freyther | 1512dc2 | 2010-04-27 13:21:39 +0800 | [diff] [blame] | 706 | bsc_close_connection(conn); |
Holger Hans Peter Freyther | de55766 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 707 | } |
| 708 | |
| 709 | static void ipaccess_auth_bsc(struct tlv_parsed *tvp, struct bsc_connection *bsc) |
| 710 | { |
| 711 | struct bsc_config *conf; |
Holger Hans Peter Freyther | dfd61a3 | 2010-09-18 06:44:24 +0800 | [diff] [blame] | 712 | const char *token = (const char *) TLVP_VAL(tvp, IPAC_IDTAG_UNITNAME); |
Holger Hans Peter Freyther | de55766 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 713 | |
Holger Hans Peter Freyther | 4dc44ea | 2010-05-02 18:58:10 +0800 | [diff] [blame] | 714 | if (bsc->cfg) { |
| 715 | LOGP(DNAT, LOGL_ERROR, "Reauth on fd %d bsc nr %d\n", |
| 716 | bsc->write_queue.bfd.fd, bsc->cfg->nr); |
| 717 | return; |
| 718 | } |
| 719 | |
Holger Hans Peter Freyther | de55766 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 720 | llist_for_each_entry(conf, &bsc->nat->bsc_configs, entry) { |
| 721 | if (strcmp(conf->token, token) == 0) { |
Holger Hans Peter Freyther | ccefba6 | 2010-06-17 18:16:00 +0800 | [diff] [blame] | 722 | rate_ctr_inc(&conf->stats.ctrg->ctr[BCFG_CTR_NET_RECONN]); |
Holger Hans Peter Freyther | de55766 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 723 | bsc->authenticated = 1; |
Holger Hans Peter Freyther | bfcf519 | 2010-04-06 15:11:34 +0200 | [diff] [blame] | 724 | bsc->cfg = conf; |
Holger Hans Peter Freyther | de55766 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 725 | bsc_del_timer(&bsc->id_timeout); |
Holger Hans Peter Freyther | 4cc5809 | 2010-05-05 17:03:44 +0800 | [diff] [blame] | 726 | LOGP(DNAT, LOGL_NOTICE, "Authenticated bsc nr: %d lac: %d on fd %d\n", |
| 727 | conf->nr, conf->lac, bsc->write_queue.bfd.fd); |
Holger Hans Peter Freyther | 582511a | 2010-05-02 19:28:59 +0800 | [diff] [blame] | 728 | start_ping_pong(bsc); |
Holger Hans Peter Freyther | 8b2302f | 2010-04-17 07:59:57 +0200 | [diff] [blame] | 729 | return; |
Holger Hans Peter Freyther | de55766 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 730 | } |
| 731 | } |
Holger Hans Peter Freyther | 8b2302f | 2010-04-17 07:59:57 +0200 | [diff] [blame] | 732 | |
Holger Hans Peter Freyther | 4cc5809 | 2010-05-05 17:03:44 +0800 | [diff] [blame] | 733 | LOGP(DNAT, LOGL_ERROR, "No bsc found for token %s on fd: %d.\n", token, |
| 734 | bsc->write_queue.bfd.fd); |
Holger Hans Peter Freyther | de55766 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 735 | } |
| 736 | |
Holger Hans Peter Freyther | 4ce3270 | 2010-03-26 07:24:34 +0100 | [diff] [blame] | 737 | static int forward_sccp_to_msc(struct bsc_connection *bsc, struct msgb *msg) |
Holger Hans Peter Freyther | 4a62960 | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 738 | { |
Holger Hans Peter Freyther | c3dccc7 | 2010-05-16 16:36:36 +0800 | [diff] [blame] | 739 | int con_filter = 0; |
Holger Hans Peter Freyther | 6a2fe9a | 2010-07-05 13:58:40 +0800 | [diff] [blame] | 740 | struct bsc_msc_connection *con_msc = NULL; |
Holger Hans Peter Freyther | df96153 | 2010-05-16 16:30:42 +0800 | [diff] [blame] | 741 | struct bsc_connection *con_bsc = NULL; |
Holger Hans Peter Freyther | d5a2bc4 | 2010-05-16 02:00:40 +0800 | [diff] [blame] | 742 | int con_type; |
Holger Hans Peter Freyther | f75a680 | 2010-06-15 18:45:38 +0800 | [diff] [blame] | 743 | struct bsc_nat_parsed *parsed; |
Holger Hans Peter Freyther | 4a62960 | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 744 | |
Holger Hans Peter Freyther | f75a680 | 2010-06-15 18:45:38 +0800 | [diff] [blame] | 745 | /* Parse and filter messages */ |
| 746 | parsed = bsc_nat_parse(msg); |
| 747 | if (!parsed) { |
| 748 | LOGP(DNAT, LOGL_ERROR, "Can not parse msg from BSC.\n"); |
Holger Hans Peter Freyther | 45f6295 | 2010-03-30 07:35:46 +0200 | [diff] [blame] | 749 | msgb_free(msg); |
Holger Hans Peter Freyther | f75a680 | 2010-06-15 18:45:38 +0800 | [diff] [blame] | 750 | return -1; |
| 751 | } |
| 752 | |
Holger Hans Peter Freyther | bbf6b65 | 2010-01-30 11:53:30 +0100 | [diff] [blame] | 753 | if (bsc_nat_filter_ipa(DIR_MSC, msg, parsed)) |
Holger Hans Peter Freyther | f75a680 | 2010-06-15 18:45:38 +0800 | [diff] [blame] | 754 | goto exit; |
Holger Hans Peter Freyther | 57adba5 | 2010-06-15 18:45:26 +0800 | [diff] [blame] | 755 | |
Holger Hans Peter Freyther | 5a723b6 | 2010-04-02 03:42:44 +0200 | [diff] [blame] | 756 | /* |
| 757 | * check authentication after filtering to not reject auth |
| 758 | * responses coming from the BSC. We have to make sure that |
| 759 | * nothing from the exit path will forward things to the MSC |
| 760 | */ |
| 761 | if (!bsc->authenticated) { |
| 762 | LOGP(DNAT, LOGL_ERROR, "BSC is not authenticated.\n"); |
| 763 | msgb_free(msg); |
| 764 | return -1; |
| 765 | } |
| 766 | |
| 767 | |
Holger Hans Peter Freyther | e83917d | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 768 | /* modify the SCCP entries */ |
| 769 | if (parsed->ipa_proto == IPAC_PROTO_SCCP) { |
Holger Hans Peter Freyther | 8582bb9 | 2010-09-15 00:38:54 +0800 | [diff] [blame] | 770 | int filter; |
Holger Hans Peter Freyther | df96153 | 2010-05-16 16:30:42 +0800 | [diff] [blame] | 771 | struct sccp_connections *con; |
Holger Hans Peter Freyther | e83917d | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 772 | switch (parsed->sccp_type) { |
| 773 | case SCCP_MSG_TYPE_CR: |
Holger Hans Peter Freyther | 8582bb9 | 2010-09-15 00:38:54 +0800 | [diff] [blame] | 774 | filter = bsc_nat_filter_sccp_cr(bsc, msg, parsed, &con_type); |
Holger Hans Peter Freyther | 531d3e3 | 2010-09-15 00:41:19 +0800 | [diff] [blame] | 775 | if (filter < 0) |
Holger Hans Peter Freyther | 6d35716 | 2010-05-14 03:39:56 +0800 | [diff] [blame] | 776 | goto exit3; |
Holger Hans Peter Freyther | e1a1648 | 2010-05-16 16:51:31 +0800 | [diff] [blame] | 777 | if (!create_sccp_src_ref(bsc, parsed)) |
Holger Hans Peter Freyther | e83917d | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 778 | goto exit2; |
Holger Hans Peter Freyther | da30c4b | 2010-04-21 18:56:12 +0800 | [diff] [blame] | 779 | con = patch_sccp_src_ref_to_msc(msg, parsed, bsc); |
Holger Hans Peter Freyther | 6200fd9 | 2010-07-05 13:33:18 +0800 | [diff] [blame] | 780 | con->msc_con = bsc->nat->msc_con; |
Holger Hans Peter Freyther | 6a2fe9a | 2010-07-05 13:58:40 +0800 | [diff] [blame] | 781 | con_msc = con->msc_con; |
Holger Hans Peter Freyther | 8e69f0c | 2010-05-16 02:06:11 +0800 | [diff] [blame] | 782 | con->con_type = con_type; |
Holger Hans Peter Freyther | 531d3e3 | 2010-09-15 00:41:19 +0800 | [diff] [blame] | 783 | con->imsi_checked = filter; |
Holger Hans Peter Freyther | df96153 | 2010-05-16 16:30:42 +0800 | [diff] [blame] | 784 | con_bsc = con->bsc; |
Holger Hans Peter Freyther | e83917d | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 785 | break; |
| 786 | case SCCP_MSG_TYPE_RLSD: |
| 787 | case SCCP_MSG_TYPE_CREF: |
| 788 | case SCCP_MSG_TYPE_DT1: |
| 789 | case SCCP_MSG_TYPE_CC: |
Holger Hans Peter Freyther | 567e840 | 2010-04-06 10:22:34 +0200 | [diff] [blame] | 790 | case SCCP_MSG_TYPE_IT: |
Holger Hans Peter Freyther | da30c4b | 2010-04-21 18:56:12 +0800 | [diff] [blame] | 791 | con = patch_sccp_src_ref_to_msc(msg, parsed, bsc); |
Holger Hans Peter Freyther | df96153 | 2010-05-16 16:30:42 +0800 | [diff] [blame] | 792 | if (con) { |
Holger Hans Peter Freyther | 1b4bde6 | 2010-09-15 01:11:08 +0800 | [diff] [blame] | 793 | filter = bsc_nat_filter_dt(bsc, msg, con, parsed); |
| 794 | if (filter == 0) { |
| 795 | con_bsc = con->bsc; |
| 796 | con_msc = con->msc_con; |
| 797 | con_filter = con->con_local; |
| 798 | } else { |
Holger Hans Peter Freyther | a8f092d | 2010-09-15 07:43:59 +0800 | [diff] [blame] | 799 | bsc_send_con_release(bsc, con); |
| 800 | con = NULL; |
| 801 | goto exit2; |
Holger Hans Peter Freyther | 1b4bde6 | 2010-09-15 01:11:08 +0800 | [diff] [blame] | 802 | } |
Holger Hans Peter Freyther | df96153 | 2010-05-16 16:30:42 +0800 | [diff] [blame] | 803 | } |
Holger Hans Peter Freyther | e83917d | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 804 | break; |
| 805 | case SCCP_MSG_TYPE_RLC: |
Holger Hans Peter Freyther | da30c4b | 2010-04-21 18:56:12 +0800 | [diff] [blame] | 806 | con = patch_sccp_src_ref_to_msc(msg, parsed, bsc); |
Holger Hans Peter Freyther | df96153 | 2010-05-16 16:30:42 +0800 | [diff] [blame] | 807 | if (con) { |
Holger Hans Peter Freyther | df96153 | 2010-05-16 16:30:42 +0800 | [diff] [blame] | 808 | con_bsc = con->bsc; |
Holger Hans Peter Freyther | 6a2fe9a | 2010-07-05 13:58:40 +0800 | [diff] [blame] | 809 | con_msc = con->msc_con; |
Holger Hans Peter Freyther | c3dccc7 | 2010-05-16 16:36:36 +0800 | [diff] [blame] | 810 | con_filter = con->con_local; |
Holger Hans Peter Freyther | df96153 | 2010-05-16 16:30:42 +0800 | [diff] [blame] | 811 | } |
Holger Hans Peter Freyther | 38712d0 | 2010-03-31 09:15:05 +0200 | [diff] [blame] | 812 | remove_sccp_src_ref(bsc, msg, parsed); |
Holger Hans Peter Freyther | e83917d | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 813 | break; |
| 814 | case SCCP_MSG_TYPE_UDT: |
| 815 | /* simply forward everything */ |
Holger Hans Peter Freyther | 75ee841 | 2010-06-15 18:48:55 +0800 | [diff] [blame] | 816 | con = NULL; |
Holger Hans Peter Freyther | e83917d | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 817 | break; |
| 818 | default: |
Holger Hans Peter Freyther | 2f1f55d | 2010-06-15 18:47:49 +0800 | [diff] [blame] | 819 | LOGP(DNAT, LOGL_ERROR, "Not forwarding to msc sccp type: 0x%x\n", parsed->sccp_type); |
Holger Hans Peter Freyther | 75ee841 | 2010-06-15 18:48:55 +0800 | [diff] [blame] | 820 | con = NULL; |
Holger Hans Peter Freyther | e83917d | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 821 | goto exit2; |
| 822 | break; |
| 823 | } |
Holger Hans Peter Freyther | 9fec010 | 2010-04-01 10:16:28 +0200 | [diff] [blame] | 824 | } else if (parsed->ipa_proto == NAT_IPAC_PROTO_MGCP) { |
| 825 | bsc_mgcp_forward(bsc, msg); |
| 826 | goto exit2; |
Holger Hans Peter Freyther | 75ee841 | 2010-06-15 18:48:55 +0800 | [diff] [blame] | 827 | } else { |
| 828 | LOGP(DNAT, LOGL_ERROR, "Not forwarding unknown stream id: 0x%x\n", parsed->ipa_proto); |
| 829 | goto exit2; |
Holger Hans Peter Freyther | e83917d | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 830 | } |
| 831 | |
Holger Hans Peter Freyther | 6a2fe9a | 2010-07-05 13:58:40 +0800 | [diff] [blame] | 832 | if (con_msc && con_bsc != bsc) { |
Holger Hans Peter Freyther | 4107f98 | 2010-04-21 18:49:55 +0800 | [diff] [blame] | 833 | LOGP(DNAT, LOGL_ERROR, "The connection belongs to a different BTS: input: %d con: %d\n", |
Holger Hans Peter Freyther | df96153 | 2010-05-16 16:30:42 +0800 | [diff] [blame] | 834 | bsc->cfg->nr, con_bsc->cfg->nr); |
Holger Hans Peter Freyther | e83917d | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 835 | goto exit2; |
| 836 | } |
| 837 | |
Holger Hans Peter Freyther | 79a6baf | 2010-09-15 17:39:44 +0800 | [diff] [blame] | 838 | /* do not forward messages to the MSC */ |
| 839 | if (con_filter) |
| 840 | goto exit2; |
| 841 | |
Holger Hans Peter Freyther | 6a2fe9a | 2010-07-05 13:58:40 +0800 | [diff] [blame] | 842 | if (!con_msc) { |
Holger Hans Peter Freyther | 43bd9d1 | 2010-09-15 00:14:48 +0800 | [diff] [blame] | 843 | LOGP(DNAT, LOGL_ERROR, "Not forwarding data bsc_nr: %d ipa: %d type: 0x%x\n", |
| 844 | bsc->cfg->nr, |
| 845 | parsed ? parsed->ipa_proto : -1, |
| 846 | parsed ? parsed->sccp_type : -1); |
Holger Hans Peter Freyther | 6a2fe9a | 2010-07-05 13:58:40 +0800 | [diff] [blame] | 847 | goto exit2; |
| 848 | } |
| 849 | |
Holger Hans Peter Freyther | 4a62960 | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 850 | /* send the non-filtered but maybe modified msg */ |
Holger Hans Peter Freyther | 6a2fe9a | 2010-07-05 13:58:40 +0800 | [diff] [blame] | 851 | queue_for_msc(con_msc, msg); |
Holger Hans Peter Freyther | 722ead8 | 2010-01-30 12:45:10 +0100 | [diff] [blame] | 852 | talloc_free(parsed); |
Holger Hans Peter Freyther | 257a8cc | 2010-06-15 18:47:02 +0800 | [diff] [blame] | 853 | return 0; |
Holger Hans Peter Freyther | f75a680 | 2010-06-15 18:45:38 +0800 | [diff] [blame] | 854 | |
| 855 | exit: |
Holger Hans Peter Freyther | 722ead8 | 2010-01-30 12:45:10 +0100 | [diff] [blame] | 856 | /* if we filter out the reset send an ack to the BSC */ |
| 857 | if (parsed->bssap == 0 && parsed->gsm_type == BSS_MAP_MSG_RESET) { |
Holger Hans Peter Freyther | 4ce3270 | 2010-03-26 07:24:34 +0100 | [diff] [blame] | 858 | send_reset_ack(bsc); |
| 859 | send_reset_ack(bsc); |
Holger Hans Peter Freyther | de55766 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 860 | } else if (parsed->ipa_proto == IPAC_PROTO_IPACCESS) { |
| 861 | /* do we know who is handling this? */ |
| 862 | if (msg->l2h[0] == IPAC_MSGT_ID_RESP) { |
| 863 | struct tlv_parsed tvp; |
| 864 | ipaccess_idtag_parse(&tvp, |
| 865 | (unsigned char *) msg->l2h + 2, |
| 866 | msgb_l2len(msg) - 2); |
| 867 | if (TLVP_PRESENT(&tvp, IPAC_IDTAG_UNITNAME)) |
| 868 | ipaccess_auth_bsc(&tvp, bsc); |
| 869 | } |
| 870 | |
| 871 | goto exit2; |
Holger Hans Peter Freyther | 722ead8 | 2010-01-30 12:45:10 +0100 | [diff] [blame] | 872 | } |
| 873 | |
Holger Hans Peter Freyther | 171d930 | 2010-05-15 00:29:50 +0800 | [diff] [blame] | 874 | exit2: |
| 875 | talloc_free(parsed); |
| 876 | msgb_free(msg); |
| 877 | return -1; |
| 878 | |
Holger Hans Peter Freyther | 6d35716 | 2010-05-14 03:39:56 +0800 | [diff] [blame] | 879 | exit3: |
| 880 | /* send a SCCP Connection Refused */ |
Holger Hans Peter Freyther | fa412e5 | 2010-05-16 02:20:26 +0800 | [diff] [blame] | 881 | bsc_send_con_refuse(bsc, parsed, con_type); |
Holger Hans Peter Freyther | f75a680 | 2010-06-15 18:45:38 +0800 | [diff] [blame] | 882 | talloc_free(parsed); |
Holger Hans Peter Freyther | 257a8cc | 2010-06-15 18:47:02 +0800 | [diff] [blame] | 883 | msgb_free(msg); |
| 884 | return -1; |
Holger Hans Peter Freyther | 4a62960 | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 885 | } |
| 886 | |
Holger Hans Peter Freyther | 8401054 | 2010-06-15 18:47:10 +0800 | [diff] [blame] | 887 | static int ipaccess_bsc_read_cb(struct bsc_fd *bfd) |
Holger Hans Peter Freyther | 4a62960 | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 888 | { |
| 889 | int error; |
Holger Hans Peter Freyther | 4ce3270 | 2010-03-26 07:24:34 +0100 | [diff] [blame] | 890 | struct bsc_connection *bsc = bfd->data; |
Holger Hans Peter Freyther | 4a62960 | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 891 | struct msgb *msg = ipaccess_read_msg(bfd, &error); |
Holger Hans Peter Freyther | 453235a | 2010-06-15 18:51:33 +0800 | [diff] [blame] | 892 | struct ipaccess_head *hh; |
Holger Hans Peter Freyther | 4a62960 | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 893 | |
| 894 | if (!msg) { |
Holger Hans Peter Freyther | bae6b8b | 2010-04-23 00:23:03 +0800 | [diff] [blame] | 895 | if (error == 0) |
Holger Hans Peter Freyther | 3c8c815 | 2010-05-01 10:37:15 +0800 | [diff] [blame] | 896 | LOGP(DNAT, LOGL_ERROR, |
| 897 | "The connection to the BSC Nr: %d was lost. Cleaning it\n", |
| 898 | bsc->cfg ? bsc->cfg->nr : -1); |
Holger Hans Peter Freyther | bae6b8b | 2010-04-23 00:23:03 +0800 | [diff] [blame] | 899 | else |
Holger Hans Peter Freyther | 3c8c815 | 2010-05-01 10:37:15 +0800 | [diff] [blame] | 900 | LOGP(DNAT, LOGL_ERROR, |
| 901 | "Stream error on BSC Nr: %d. Failed to parse ip access message: %d\n", |
| 902 | bsc->cfg ? bsc->cfg->nr : -1, error); |
Holger Hans Peter Freyther | bae6b8b | 2010-04-23 00:23:03 +0800 | [diff] [blame] | 903 | |
Holger Hans Peter Freyther | 1512dc2 | 2010-04-27 13:21:39 +0800 | [diff] [blame] | 904 | bsc_close_connection(bsc); |
Holger Hans Peter Freyther | 4a62960 | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 905 | return -1; |
| 906 | } |
| 907 | |
Holger Hans Peter Freyther | 4a62960 | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 908 | |
Holger Hans Peter Freyther | 8f99b82 | 2010-01-29 05:58:43 +0100 | [diff] [blame] | 909 | LOGP(DNAT, LOGL_DEBUG, "MSG from BSC: %s proto: %d\n", hexdump(msg->data, msg->len), msg->l2h[0]); |
Holger Hans Peter Freyther | 4a62960 | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 910 | |
| 911 | /* Handle messages from the BSC */ |
Holger Hans Peter Freyther | 453235a | 2010-06-15 18:51:33 +0800 | [diff] [blame] | 912 | hh = (struct ipaccess_head *) msg->data; |
Holger Hans Peter Freyther | 582511a | 2010-05-02 19:28:59 +0800 | [diff] [blame] | 913 | |
Holger Hans Peter Freyther | 453235a | 2010-06-15 18:51:33 +0800 | [diff] [blame] | 914 | /* stop the pong timeout */ |
| 915 | if (hh->proto == IPAC_PROTO_IPACCESS) { |
| 916 | if (msg->l2h[0] == IPAC_MSGT_PONG) { |
Holger Hans Peter Freyther | 582511a | 2010-05-02 19:28:59 +0800 | [diff] [blame] | 917 | bsc_del_timer(&bsc->pong_timeout); |
| 918 | msgb_free(msg); |
| 919 | return 0; |
Holger Hans Peter Freyther | 453235a | 2010-06-15 18:51:33 +0800 | [diff] [blame] | 920 | } else if (msg->l2h[0] == IPAC_MSGT_PING) { |
| 921 | send_pong(bsc); |
| 922 | msgb_free(msg); |
| 923 | return 0; |
Holger Hans Peter Freyther | 582511a | 2010-05-02 19:28:59 +0800 | [diff] [blame] | 924 | } |
| 925 | } |
| 926 | |
Holger Hans Peter Freyther | 4a62960 | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 927 | /* FIXME: Currently no PONG is sent to the BSC */ |
| 928 | /* FIXME: Currently no ID ACK is sent to the BSC */ |
Holger Hans Peter Freyther | 4ce3270 | 2010-03-26 07:24:34 +0100 | [diff] [blame] | 929 | forward_sccp_to_msc(bsc, msg); |
Holger Hans Peter Freyther | 4a62960 | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 930 | |
| 931 | return 0; |
| 932 | } |
| 933 | |
Holger Hans Peter Freyther | 2ec5517 | 2010-03-26 09:18:02 +0100 | [diff] [blame] | 934 | static int ipaccess_bsc_write_cb(struct bsc_fd *bfd, struct msgb *msg) |
| 935 | { |
| 936 | int rc; |
| 937 | |
| 938 | rc = write(bfd->fd, msg->data, msg->len); |
| 939 | if (rc != msg->len) |
| 940 | LOGP(DNAT, LOGL_ERROR, "Failed to write message to the BSC.\n"); |
| 941 | |
| 942 | return rc; |
| 943 | } |
| 944 | |
Holger Hans Peter Freyther | e8fa0f1 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 945 | static int ipaccess_listen_bsc_cb(struct bsc_fd *bfd, unsigned int what) |
| 946 | { |
Holger Hans Peter Freyther | 4a62960 | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 947 | struct bsc_connection *bsc; |
Holger Hans Peter Freyther | 74d0042 | 2010-05-05 20:33:34 +0800 | [diff] [blame] | 948 | int fd, rc, on; |
Holger Hans Peter Freyther | e8fa0f1 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 949 | struct sockaddr_in sa; |
| 950 | socklen_t sa_len = sizeof(sa); |
| 951 | |
| 952 | if (!(what & BSC_FD_READ)) |
| 953 | return 0; |
| 954 | |
Holger Hans Peter Freyther | 74d0042 | 2010-05-05 20:33:34 +0800 | [diff] [blame] | 955 | fd = accept(bfd->fd, (struct sockaddr *) &sa, &sa_len); |
| 956 | if (fd < 0) { |
Holger Hans Peter Freyther | e8fa0f1 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 957 | perror("accept"); |
Holger Hans Peter Freyther | 74d0042 | 2010-05-05 20:33:34 +0800 | [diff] [blame] | 958 | return fd; |
Holger Hans Peter Freyther | e8fa0f1 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 959 | } |
| 960 | |
Holger Hans Peter Freyther | 5fa42dd | 2010-04-12 12:17:09 +0200 | [diff] [blame] | 961 | /* count the reconnect */ |
| 962 | counter_inc(nat->stats.bsc.reconn); |
| 963 | |
Holger Hans Peter Freyther | 3399df3 | 2010-03-29 08:04:09 +0200 | [diff] [blame] | 964 | /* |
| 965 | * if we are not connected to a msc... just close the socket |
| 966 | */ |
Holger Hans Peter Freyther | 4d0fbda | 2010-07-05 14:39:44 +0800 | [diff] [blame] | 967 | if (!bsc_nat_msc_is_connected(nat)) { |
Holger Hans Peter Freyther | 3399df3 | 2010-03-29 08:04:09 +0200 | [diff] [blame] | 968 | LOGP(DNAT, LOGL_NOTICE, "Disconnecting BSC due lack of MSC connection.\n"); |
Holger Hans Peter Freyther | 74d0042 | 2010-05-05 20:33:34 +0800 | [diff] [blame] | 969 | close(fd); |
Holger Hans Peter Freyther | 3399df3 | 2010-03-29 08:04:09 +0200 | [diff] [blame] | 970 | return 0; |
| 971 | } |
| 972 | |
Holger Hans Peter Freyther | 150fa58 | 2010-05-05 18:58:13 +0800 | [diff] [blame] | 973 | on = 1; |
Holger Hans Peter Freyther | d58afeb | 2010-05-05 20:42:14 +0800 | [diff] [blame] | 974 | rc = setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)); |
Holger Hans Peter Freyther | 74d0042 | 2010-05-05 20:33:34 +0800 | [diff] [blame] | 975 | if (rc != 0) |
Holger Hans Peter Freyther | 150fa58 | 2010-05-05 18:58:13 +0800 | [diff] [blame] | 976 | LOGP(DNAT, LOGL_ERROR, "Failed to set TCP_NODELAY: %s\n", strerror(errno)); |
| 977 | |
Holger Hans Peter Freyther | 9d42d32 | 2010-05-31 10:36:35 +0800 | [diff] [blame] | 978 | rc = setsockopt(fd, IPPROTO_IP, IP_TOS, |
Holger Hans Peter Freyther | f0374a5 | 2010-07-27 19:21:53 +0800 | [diff] [blame] | 979 | &nat->bsc_ip_dscp, sizeof(nat->bsc_ip_dscp)); |
Holger Hans Peter Freyther | 9d42d32 | 2010-05-31 10:36:35 +0800 | [diff] [blame] | 980 | if (rc != 0) |
| 981 | LOGP(DNAT, LOGL_ERROR, "Failed to set IP_TOS: %s\n", strerror(errno)); |
| 982 | |
Holger Hans Peter Freyther | e8fa0f1 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 983 | /* todo... do something with the connection */ |
Holger Hans Peter Freyther | 738dbdf | 2010-01-12 21:35:32 +0100 | [diff] [blame] | 984 | /* todo... use GNUtls to see if we want to trust this as a BTS */ |
Holger Hans Peter Freyther | e8fa0f1 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 985 | |
Holger Hans Peter Freyther | 4a62960 | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 986 | /* |
| 987 | * |
| 988 | */ |
Holger Hans Peter Freyther | 090a4d8 | 2010-06-15 18:48:01 +0800 | [diff] [blame] | 989 | bsc = bsc_connection_alloc(nat); |
Holger Hans Peter Freyther | 4a62960 | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 990 | if (!bsc) { |
Holger Hans Peter Freyther | 8f99b82 | 2010-01-29 05:58:43 +0100 | [diff] [blame] | 991 | LOGP(DNAT, LOGL_ERROR, "Failed to allocate BSC struct.\n"); |
Holger Hans Peter Freyther | 74d0042 | 2010-05-05 20:33:34 +0800 | [diff] [blame] | 992 | close(fd); |
Holger Hans Peter Freyther | 4a62960 | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 993 | return -1; |
| 994 | } |
| 995 | |
Holger Hans Peter Freyther | 8401054 | 2010-06-15 18:47:10 +0800 | [diff] [blame] | 996 | bsc->write_queue.bfd.data = bsc; |
Holger Hans Peter Freyther | 74d0042 | 2010-05-05 20:33:34 +0800 | [diff] [blame] | 997 | bsc->write_queue.bfd.fd = fd; |
Holger Hans Peter Freyther | 8401054 | 2010-06-15 18:47:10 +0800 | [diff] [blame] | 998 | bsc->write_queue.read_cb = ipaccess_bsc_read_cb; |
Holger Hans Peter Freyther | 2ec5517 | 2010-03-26 09:18:02 +0100 | [diff] [blame] | 999 | bsc->write_queue.write_cb = ipaccess_bsc_write_cb; |
Holger Hans Peter Freyther | 8401054 | 2010-06-15 18:47:10 +0800 | [diff] [blame] | 1000 | bsc->write_queue.bfd.when = BSC_FD_READ; |
| 1001 | if (bsc_register_fd(&bsc->write_queue.bfd) < 0) { |
Holger Hans Peter Freyther | 8f99b82 | 2010-01-29 05:58:43 +0100 | [diff] [blame] | 1002 | LOGP(DNAT, LOGL_ERROR, "Failed to register BSC fd.\n"); |
Holger Hans Peter Freyther | 74d0042 | 2010-05-05 20:33:34 +0800 | [diff] [blame] | 1003 | close(fd); |
Holger Hans Peter Freyther | 4a62960 | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 1004 | talloc_free(bsc); |
| 1005 | return -2; |
| 1006 | } |
| 1007 | |
Holger Hans Peter Freyther | 4cc5809 | 2010-05-05 17:03:44 +0800 | [diff] [blame] | 1008 | LOGP(DNAT, LOGL_NOTICE, "BSC connection on %d with IP: %s\n", |
Holger Hans Peter Freyther | 74d0042 | 2010-05-05 20:33:34 +0800 | [diff] [blame] | 1009 | fd, inet_ntoa(sa.sin_addr)); |
Holger Hans Peter Freyther | 5e54788 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 1010 | llist_add(&bsc->list_entry, &nat->bsc_connections); |
Holger Hans Peter Freyther | 809d6fa | 2010-03-26 07:41:54 +0100 | [diff] [blame] | 1011 | send_id_ack(bsc); |
| 1012 | send_id_req(bsc); |
Holger Hans Peter Freyther | 8c61cdb | 2010-03-31 07:30:58 +0200 | [diff] [blame] | 1013 | send_mgcp_reset(bsc); |
Holger Hans Peter Freyther | de55766 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 1014 | |
| 1015 | /* |
| 1016 | * start the hangup timer |
| 1017 | */ |
| 1018 | bsc->id_timeout.data = bsc; |
| 1019 | bsc->id_timeout.cb = ipaccess_close_bsc; |
Holger Hans Peter Freyther | acd3078 | 2010-05-05 16:57:38 +0800 | [diff] [blame] | 1020 | bsc_schedule_timer(&bsc->id_timeout, nat->auth_timeout, 0); |
Holger Hans Peter Freyther | e8fa0f1 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 1021 | return 0; |
| 1022 | } |
| 1023 | |
| 1024 | static int listen_for_bsc(struct bsc_fd *bfd, struct in_addr *in_addr, int port) |
| 1025 | { |
| 1026 | struct sockaddr_in addr; |
| 1027 | int ret, on = 1; |
| 1028 | |
| 1029 | bfd->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); |
| 1030 | bfd->cb = ipaccess_listen_bsc_cb; |
| 1031 | bfd->when = BSC_FD_READ; |
| 1032 | |
| 1033 | memset(&addr, 0, sizeof(addr)); |
| 1034 | addr.sin_family = AF_INET; |
| 1035 | addr.sin_port = htons(port); |
| 1036 | addr.sin_addr.s_addr = in_addr->s_addr; |
| 1037 | |
| 1038 | setsockopt(bfd->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); |
| 1039 | |
| 1040 | ret = bind(bfd->fd, (struct sockaddr *) &addr, sizeof(addr)); |
| 1041 | if (ret < 0) { |
Holger Hans Peter Freyther | b9ca9a7 | 2010-09-05 08:51:12 +0800 | [diff] [blame] | 1042 | fprintf(stderr, "Could not bind the BSC socket: %s\n", |
Holger Hans Peter Freyther | e8fa0f1 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 1043 | strerror(errno)); |
| 1044 | return -EIO; |
| 1045 | } |
| 1046 | |
| 1047 | ret = listen(bfd->fd, 1); |
| 1048 | if (ret < 0) { |
| 1049 | perror("listen"); |
| 1050 | return ret; |
| 1051 | } |
| 1052 | |
| 1053 | ret = bsc_register_fd(bfd); |
| 1054 | if (ret < 0) { |
| 1055 | perror("register_listen_fd"); |
| 1056 | return ret; |
| 1057 | } |
| 1058 | return 0; |
| 1059 | } |
| 1060 | |
Holger Hans Peter Freyther | 89d9fd9 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 1061 | static void print_usage() |
| 1062 | { |
| 1063 | printf("Usage: bsc_nat\n"); |
| 1064 | } |
| 1065 | |
| 1066 | static void print_help() |
| 1067 | { |
| 1068 | printf(" Some useful help...\n"); |
| 1069 | printf(" -h --help this text\n"); |
| 1070 | printf(" -d option --debug=DRLL:DCC:DMM:DRR:DRSL:DNM enable debugging\n"); |
Harald Welte | c4ae176 | 2010-08-25 19:43:54 +0200 | [diff] [blame] | 1071 | printf(" -D --daemonize Fork the process into a background daemon\n"); |
Holger Hans Peter Freyther | 89d9fd9 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 1072 | printf(" -s --disable-color\n"); |
| 1073 | printf(" -c --config-file filename The config file to use.\n"); |
| 1074 | printf(" -m --msc=IP. The address of the MSC.\n"); |
Holger Hans Peter Freyther | e8fa0f1 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 1075 | printf(" -l --local=IP. The local address of this BSC.\n"); |
Holger Hans Peter Freyther | 89d9fd9 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 1076 | } |
| 1077 | |
Holger Hans Peter Freyther | dfd61a3 | 2010-09-18 06:44:24 +0800 | [diff] [blame] | 1078 | static void handle_options(int argc, char **argv) |
Holger Hans Peter Freyther | 89d9fd9 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 1079 | { |
| 1080 | while (1) { |
| 1081 | int option_index = 0, c; |
| 1082 | static struct option long_options[] = { |
| 1083 | {"help", 0, 0, 'h'}, |
| 1084 | {"debug", 1, 0, 'd'}, |
| 1085 | {"config-file", 1, 0, 'c'}, |
| 1086 | {"disable-color", 0, 0, 's'}, |
| 1087 | {"timestamp", 0, 0, 'T'}, |
| 1088 | {"msc", 1, 0, 'm'}, |
| 1089 | {"local", 1, 0, 'l'}, |
| 1090 | {0, 0, 0, 0} |
| 1091 | }; |
| 1092 | |
| 1093 | c = getopt_long(argc, argv, "hd:sTPc:m:l:", |
| 1094 | long_options, &option_index); |
| 1095 | if (c == -1) |
| 1096 | break; |
| 1097 | |
| 1098 | switch (c) { |
| 1099 | case 'h': |
| 1100 | print_usage(); |
| 1101 | print_help(); |
| 1102 | exit(0); |
| 1103 | case 's': |
Holger Hans Peter Freyther | 4acca1a | 2010-06-15 19:14:12 +0800 | [diff] [blame] | 1104 | log_set_use_color(stderr_target, 0); |
Holger Hans Peter Freyther | 89d9fd9 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 1105 | break; |
| 1106 | case 'd': |
Holger Hans Peter Freyther | 4acca1a | 2010-06-15 19:14:12 +0800 | [diff] [blame] | 1107 | log_parse_category_mask(stderr_target, optarg); |
Holger Hans Peter Freyther | 89d9fd9 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 1108 | break; |
| 1109 | case 'c': |
| 1110 | config_file = strdup(optarg); |
| 1111 | break; |
| 1112 | case 'T': |
Holger Hans Peter Freyther | 4acca1a | 2010-06-15 19:14:12 +0800 | [diff] [blame] | 1113 | log_set_print_timestamp(stderr_target, 1); |
Holger Hans Peter Freyther | 89d9fd9 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 1114 | break; |
| 1115 | case 'm': |
Holger Hans Peter Freyther | 9226d70 | 2010-06-15 18:51:04 +0800 | [diff] [blame] | 1116 | msc_ip = optarg; |
Holger Hans Peter Freyther | 89d9fd9 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 1117 | break; |
| 1118 | case 'l': |
| 1119 | inet_aton(optarg, &local_addr); |
| 1120 | break; |
| 1121 | default: |
| 1122 | /* ignore */ |
| 1123 | break; |
| 1124 | } |
| 1125 | } |
| 1126 | } |
| 1127 | |
Holger Hans Peter Freyther | e907cb2 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 1128 | static void signal_handler(int signal) |
| 1129 | { |
Holger Hans Peter Freyther | e907cb2 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 1130 | switch (signal) { |
| 1131 | case SIGABRT: |
| 1132 | /* in case of abort, we want to obtain a talloc report |
| 1133 | * and then return to the caller, who will abort the process */ |
| 1134 | case SIGUSR1: |
| 1135 | talloc_report_full(tall_bsc_ctx, stderr); |
| 1136 | break; |
| 1137 | default: |
| 1138 | break; |
| 1139 | } |
| 1140 | } |
| 1141 | |
Holger Hans Peter Freyther | 6088cc7 | 2010-06-15 18:51:56 +0800 | [diff] [blame] | 1142 | static void sccp_close_unconfirmed(void *_data) |
| 1143 | { |
| 1144 | struct sccp_connections *conn, *tmp1; |
| 1145 | struct timespec now; |
| 1146 | clock_gettime(CLOCK_MONOTONIC, &now); |
| 1147 | |
| 1148 | llist_for_each_entry_safe(conn, tmp1, &nat->sccp_connections, list_entry) { |
| 1149 | if (conn->has_remote_ref) |
| 1150 | continue; |
| 1151 | |
| 1152 | int diff = (now.tv_sec - conn->creation_time.tv_sec) / 60; |
| 1153 | if (diff < SCCP_CLOSE_TIME_TIMEOUT) |
| 1154 | continue; |
| 1155 | |
| 1156 | LOGP(DNAT, LOGL_ERROR, "SCCP connection 0x%x/0x%x was never confirmed.\n", |
| 1157 | sccp_src_ref_to_int(&conn->real_ref), |
| 1158 | sccp_src_ref_to_int(&conn->patched_ref)); |
| 1159 | sccp_connection_destroy(conn); |
| 1160 | } |
| 1161 | |
| 1162 | bsc_schedule_timer(&sccp_close, SCCP_CLOSE_TIME, 0); |
| 1163 | } |
| 1164 | |
Holger Hans Peter Freyther | 023a550 | 2010-06-15 18:51:25 +0800 | [diff] [blame] | 1165 | extern void *tall_msgb_ctx; |
| 1166 | extern void *tall_ctr_ctx; |
| 1167 | static void talloc_init_ctx() |
| 1168 | { |
| 1169 | tall_bsc_ctx = talloc_named_const(NULL, 0, "nat"); |
| 1170 | tall_msgb_ctx = talloc_named_const(tall_bsc_ctx, 0, "msgb"); |
| 1171 | tall_ctr_ctx = talloc_named_const(tall_bsc_ctx, 0, "counter"); |
| 1172 | } |
| 1173 | |
Holger Hans Peter Freyther | 4fcedba | 2010-06-15 20:14:08 +0800 | [diff] [blame] | 1174 | extern enum node_type bsc_vty_go_parent(struct vty *vty); |
| 1175 | |
| 1176 | static struct vty_app_info vty_info = { |
| 1177 | .name = "BSC NAT", |
| 1178 | .version = PACKAGE_VERSION, |
| 1179 | .go_parent_cb = bsc_vty_go_parent, |
Holger Hans Peter Freyther | ba289d0 | 2010-09-04 11:00:01 +0800 | [diff] [blame] | 1180 | .is_config_node = bsc_vty_is_config_node, |
Holger Hans Peter Freyther | 4fcedba | 2010-06-15 20:14:08 +0800 | [diff] [blame] | 1181 | }; |
| 1182 | |
Holger Hans Peter Freyther | dfd61a3 | 2010-09-18 06:44:24 +0800 | [diff] [blame] | 1183 | int main(int argc, char **argv) |
Holger Hans Peter Freyther | 89d9fd9 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 1184 | { |
Harald Welte | c4ae176 | 2010-08-25 19:43:54 +0200 | [diff] [blame] | 1185 | int rc; |
Holger Hans Peter Freyther | 023a550 | 2010-06-15 18:51:25 +0800 | [diff] [blame] | 1186 | |
Harald Welte | c4ae176 | 2010-08-25 19:43:54 +0200 | [diff] [blame] | 1187 | talloc_init_ctx(); |
Holger Hans Peter Freyther | 0937138 | 2010-06-15 18:51:18 +0800 | [diff] [blame] | 1188 | |
Holger Hans Peter Freyther | 4acca1a | 2010-06-15 19:14:12 +0800 | [diff] [blame] | 1189 | log_init(&log_info); |
| 1190 | stderr_target = log_target_create_stderr(); |
| 1191 | log_add_target(stderr_target); |
| 1192 | log_set_all_filter(stderr_target, 1); |
Holger Hans Peter Freyther | 3b96089 | 2010-06-15 19:06:18 +0800 | [diff] [blame] | 1193 | |
Holger Hans Peter Freyther | 5e54788 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 1194 | nat = bsc_nat_alloc(); |
| 1195 | if (!nat) { |
| 1196 | fprintf(stderr, "Failed to allocate the BSC nat.\n"); |
| 1197 | return -4; |
| 1198 | } |
| 1199 | |
Holger Hans Peter Freyther | 774d1d3 | 2010-08-05 10:08:36 +0000 | [diff] [blame] | 1200 | nat->mgcp_cfg = mgcp_config_alloc(); |
Holger Hans Peter Freyther | 9226d70 | 2010-06-15 18:51:04 +0800 | [diff] [blame] | 1201 | if (!nat->mgcp_cfg) { |
| 1202 | fprintf(stderr, "Failed to allocate MGCP cfg.\n"); |
| 1203 | return -5; |
| 1204 | } |
| 1205 | |
Holger Hans Peter Freyther | 4fcedba | 2010-06-15 20:14:08 +0800 | [diff] [blame] | 1206 | vty_info.copyright = openbsc_copyright; |
| 1207 | vty_init(&vty_info); |
| 1208 | logging_vty_add_cmds(); |
| 1209 | bsc_nat_vty_init(nat); |
| 1210 | |
| 1211 | |
Holger Hans Peter Freyther | 9226d70 | 2010-06-15 18:51:04 +0800 | [diff] [blame] | 1212 | /* parse options */ |
| 1213 | local_addr.s_addr = INADDR_ANY; |
| 1214 | handle_options(argc, argv); |
Holger Hans Peter Freyther | 3660e4d | 2010-06-15 18:50:26 +0800 | [diff] [blame] | 1215 | |
Holger Hans Peter Freyther | ccefba6 | 2010-06-17 18:16:00 +0800 | [diff] [blame] | 1216 | rate_ctr_init(tall_bsc_ctx); |
| 1217 | |
Holger Hans Peter Freyther | 5e54788 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 1218 | /* init vty and parse */ |
Holger Hans Peter Freyther | 4fcedba | 2010-06-15 20:14:08 +0800 | [diff] [blame] | 1219 | telnet_init(tall_bsc_ctx, NULL, 4244); |
Holger Hans Peter Freyther | 3660e4d | 2010-06-15 18:50:26 +0800 | [diff] [blame] | 1220 | if (mgcp_parse_config(config_file, nat->mgcp_cfg) < 0) { |
Holger Hans Peter Freyther | 5e54788 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 1221 | fprintf(stderr, "Failed to parse the config file: '%s'\n", config_file); |
| 1222 | return -3; |
| 1223 | } |
| 1224 | |
Holger Hans Peter Freyther | 9226d70 | 2010-06-15 18:51:04 +0800 | [diff] [blame] | 1225 | /* over rule the VTY config */ |
| 1226 | if (msc_ip) |
| 1227 | bsc_nat_set_msc_ip(nat, msc_ip); |
| 1228 | |
Holger Hans Peter Freyther | 89d9fd9 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 1229 | /* seed the PRNG */ |
| 1230 | srand(time(NULL)); |
| 1231 | |
Holger Hans Peter Freyther | 3468be3 | 2010-03-31 13:02:22 +0200 | [diff] [blame] | 1232 | /* |
| 1233 | * Setup the MGCP code.. |
| 1234 | */ |
Holger Hans Peter Freyther | 3633095 | 2010-04-22 12:08:17 +0800 | [diff] [blame] | 1235 | if (bsc_mgcp_nat_init(nat) != 0) |
Holger Hans Peter Freyther | 3468be3 | 2010-03-31 13:02:22 +0200 | [diff] [blame] | 1236 | return -4; |
| 1237 | |
Holger Hans Peter Freyther | e8fa0f1 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 1238 | /* connect to the MSC */ |
Holger Hans Peter Freyther | 7ba0c54 | 2010-06-15 18:52:38 +0800 | [diff] [blame] | 1239 | nat->msc_con = bsc_msc_create(nat->msc_ip, nat->msc_port, 0); |
Holger Hans Peter Freyther | 8e2e0ac | 2010-05-11 19:07:39 +0800 | [diff] [blame] | 1240 | if (!nat->msc_con) { |
Holger Hans Peter Freyther | 4a860a0 | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 1241 | fprintf(stderr, "Creating a bsc_msc_connection failed.\n"); |
Holger Hans Peter Freyther | e907cb2 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 1242 | exit(1); |
| 1243 | } |
| 1244 | |
Holger Hans Peter Freyther | 8e2e0ac | 2010-05-11 19:07:39 +0800 | [diff] [blame] | 1245 | nat->msc_con->connection_loss = msc_connection_was_lost; |
Holger Hans Peter Freyther | 0cb4fd9 | 2010-08-04 02:31:55 +0800 | [diff] [blame] | 1246 | nat->msc_con->connected = msc_connection_connected; |
Holger Hans Peter Freyther | 8e2e0ac | 2010-05-11 19:07:39 +0800 | [diff] [blame] | 1247 | nat->msc_con->write_queue.read_cb = ipaccess_msc_read_cb; |
| 1248 | nat->msc_con->write_queue.write_cb = ipaccess_msc_write_cb;; |
Holger Hans Peter Freyther | 8fd9775 | 2010-07-05 14:14:18 +0800 | [diff] [blame] | 1249 | nat->msc_con->write_queue.bfd.data = nat->msc_con; |
Holger Hans Peter Freyther | 8e2e0ac | 2010-05-11 19:07:39 +0800 | [diff] [blame] | 1250 | bsc_msc_connect(nat->msc_con); |
Holger Hans Peter Freyther | 4a860a0 | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 1251 | |
Holger Hans Peter Freyther | e8fa0f1 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 1252 | /* wait for the BSC */ |
Holger Hans Peter Freyther | bea0ac6 | 2010-03-26 06:51:04 +0100 | [diff] [blame] | 1253 | if (listen_for_bsc(&bsc_listen, &local_addr, 5000) < 0) { |
Holger Hans Peter Freyther | e8fa0f1 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 1254 | fprintf(stderr, "Failed to listen for BSC.\n"); |
| 1255 | exit(1); |
| 1256 | } |
| 1257 | |
Holger Hans Peter Freyther | e907cb2 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 1258 | signal(SIGABRT, &signal_handler); |
| 1259 | signal(SIGUSR1, &signal_handler); |
| 1260 | signal(SIGPIPE, SIG_IGN); |
| 1261 | |
Harald Welte | c4ae176 | 2010-08-25 19:43:54 +0200 | [diff] [blame] | 1262 | if (daemonize) { |
| 1263 | rc = osmo_daemonize(); |
| 1264 | if (rc < 0) { |
| 1265 | perror("Error during daemonize"); |
| 1266 | exit(1); |
| 1267 | } |
| 1268 | } |
| 1269 | |
Holger Hans Peter Freyther | 6088cc7 | 2010-06-15 18:51:56 +0800 | [diff] [blame] | 1270 | /* recycle timer */ |
Holger Hans Peter Freyther | a8dffc1 | 2010-07-30 02:53:14 +0800 | [diff] [blame] | 1271 | sccp_set_log_area(DSCCP); |
Holger Hans Peter Freyther | 6088cc7 | 2010-06-15 18:51:56 +0800 | [diff] [blame] | 1272 | sccp_close.cb = sccp_close_unconfirmed; |
| 1273 | sccp_close.data = NULL; |
| 1274 | bsc_schedule_timer(&sccp_close, SCCP_CLOSE_TIME, 0); |
| 1275 | |
Holger Hans Peter Freyther | e907cb2 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 1276 | while (1) { |
| 1277 | bsc_select_main(0); |
| 1278 | } |
| 1279 | |
Holger Hans Peter Freyther | 89d9fd9 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 1280 | return 0; |
| 1281 | } |