Holger Hans Peter Freyther | 9e2c5f5 | 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 | df6143a | 2010-06-15 18:46:56 +0800 | [diff] [blame] | 5 | * (C) 2010 by On-Waves |
Holger Hans Peter Freyther | 49d8068 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 6 | * (C) 2009 by Harald Welte <laforge@gnumonks.org> |
Holger Hans Peter Freyther | 9e2c5f5 | 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 | 9e938c6 | 2010-05-05 18:58:13 +0800 | [diff] [blame] | 26 | #include <netinet/tcp.h> |
Holger Hans Peter Freyther | 9e2c5f5 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 27 | #include <arpa/inet.h> |
| 28 | |
Holger Hans Peter Freyther | 49d8068 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 29 | #include <errno.h> |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 30 | #include <signal.h> |
Holger Hans Peter Freyther | 9e2c5f5 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 31 | #include <stdio.h> |
| 32 | #include <stdlib.h> |
Holger Hans Peter Freyther | 5aa25ae | 2010-01-12 21:36:08 +0100 | [diff] [blame] | 33 | #include <time.h> |
Holger Hans Peter Freyther | 9e2c5f5 | 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 | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 40 | #include <openbsc/bsc_msc.h> |
Holger Hans Peter Freyther | 6a97b8d | 2010-06-15 18:45:26 +0800 | [diff] [blame] | 41 | #include <openbsc/bsc_nat.h> |
Holger Hans Peter Freyther | 38a77d0 | 2010-01-30 12:45:10 +0100 | [diff] [blame] | 42 | #include <openbsc/bssap.h> |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 43 | #include <openbsc/ipaccess.h> |
| 44 | #include <openbsc/abis_nm.h> |
Holger Hans Peter Freyther | 9a85ef3 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 45 | #include <openbsc/telnet_interface.h> |
| 46 | |
Holger Hans Peter Freyther | ed775e4 | 2010-06-15 18:52:24 +0800 | [diff] [blame] | 47 | #include <osmocore/gsm0808.h> |
Holger Hans Peter Freyther | 6c45f2e | 2010-06-15 19:06:18 +0800 | [diff] [blame] | 48 | #include <osmocore/talloc.h> |
| 49 | |
Holger Hans Peter Freyther | 9a85ef3 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 50 | #include <vty/vty.h> |
Holger Hans Peter Freyther | 9e2c5f5 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 51 | |
Holger Hans Peter Freyther | 6a97b8d | 2010-06-15 18:45:26 +0800 | [diff] [blame] | 52 | #include <sccp/sccp.h> |
| 53 | |
Holger Hans Peter Freyther | 6b6ecba | 2010-06-15 18:51:56 +0800 | [diff] [blame] | 54 | #define SCCP_CLOSE_TIME 20 |
| 55 | #define SCCP_CLOSE_TIME_TIMEOUT 19 |
| 56 | |
Holger Hans Peter Freyther | fb7a934 | 2010-06-15 19:14:12 +0800 | [diff] [blame] | 57 | struct log_target *stderr_target; |
Holger Hans Peter Freyther | 9a85ef3 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 58 | static const char *config_file = "bsc-nat.cfg"; |
Holger Hans Peter Freyther | 9e2c5f5 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 59 | static struct in_addr local_addr; |
Holger Hans Peter Freyther | 2d677c6 | 2010-03-26 06:51:04 +0100 | [diff] [blame] | 60 | static struct bsc_fd bsc_listen; |
Holger Hans Peter Freyther | a88742c | 2010-06-15 18:51:04 +0800 | [diff] [blame] | 61 | static const char *msc_ip = NULL; |
Holger Hans Peter Freyther | 6b6ecba | 2010-06-15 18:51:56 +0800 | [diff] [blame] | 62 | static struct timer_list sccp_close; |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 63 | |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 64 | |
Holger Hans Peter Freyther | 9a85ef3 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 65 | static struct bsc_nat *nat; |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 66 | static void bsc_send_data(struct bsc_connection *bsc, const u_int8_t *data, unsigned int length, int); |
Holger Hans Peter Freyther | b752761 | 2010-04-07 11:20:36 +0200 | [diff] [blame] | 67 | static void msc_send_reset(struct bsc_msc_connection *con); |
Holger Hans Peter Freyther | 9a85ef3 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 68 | |
Holger Hans Peter Freyther | 9a85ef3 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 69 | struct bsc_config *bsc_config_num(struct bsc_nat *nat, int num) |
| 70 | { |
| 71 | struct bsc_config *conf; |
| 72 | |
| 73 | llist_for_each_entry(conf, &nat->bsc_configs, entry) |
| 74 | if (conf->nr == num) |
| 75 | return conf; |
| 76 | |
| 77 | return NULL; |
| 78 | } |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 79 | |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 80 | /* |
| 81 | * below are stubs we need to link |
| 82 | */ |
| 83 | int nm_state_event(enum nm_evt evt, u_int8_t obj_class, void *obj, |
Holger Hans Peter Freyther | 2f2d342 | 2010-05-12 16:55:12 +0800 | [diff] [blame] | 84 | struct gsm_nm_state *old_state, struct gsm_nm_state *new_state, |
| 85 | struct abis_om_obj_inst *obj_ins) |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 86 | { |
| 87 | return -1; |
| 88 | } |
| 89 | |
| 90 | void input_event(int event, enum e1inp_sign_type type, struct gsm_bts_trx *trx) |
| 91 | {} |
| 92 | |
| 93 | int gsm0408_rcvmsg(struct msgb *msg, u_int8_t link_id) |
| 94 | { |
| 95 | return -1; |
| 96 | } |
| 97 | |
Holger Hans Peter Freyther | 9d56d0c | 2010-04-22 19:11:37 +0800 | [diff] [blame] | 98 | static void queue_for_msc(struct bsc_msc_connection *con, struct msgb *msg) |
| 99 | { |
Holger Hans Peter Freyther | aad82ce | 2010-05-11 19:07:39 +0800 | [diff] [blame] | 100 | if (write_queue_enqueue(&nat->msc_con->write_queue, msg) != 0) { |
Holger Hans Peter Freyther | 9d56d0c | 2010-04-22 19:11:37 +0800 | [diff] [blame] | 101 | LOGP(DINP, LOGL_ERROR, "Failed to enqueue the write.\n"); |
| 102 | msgb_free(msg); |
| 103 | } |
| 104 | } |
| 105 | |
Holger Hans Peter Freyther | 3025e19 | 2010-03-26 09:18:02 +0100 | [diff] [blame] | 106 | static void send_reset_ack(struct bsc_connection *bsc) |
Holger Hans Peter Freyther | 38a77d0 | 2010-01-30 12:45:10 +0100 | [diff] [blame] | 107 | { |
| 108 | static const u_int8_t gsm_reset_ack[] = { |
Holger Hans Peter Freyther | 38a77d0 | 2010-01-30 12:45:10 +0100 | [diff] [blame] | 109 | 0x09, 0x00, 0x03, 0x07, 0x0b, 0x04, 0x43, 0x01, |
| 110 | 0x00, 0xfe, 0x04, 0x43, 0x5c, 0x00, 0xfe, 0x03, |
| 111 | 0x00, 0x01, 0x31, |
| 112 | }; |
| 113 | |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 114 | bsc_send_data(bsc, gsm_reset_ack, sizeof(gsm_reset_ack), IPAC_PROTO_SCCP); |
Holger Hans Peter Freyther | 38a77d0 | 2010-01-30 12:45:10 +0100 | [diff] [blame] | 115 | } |
| 116 | |
Holger Hans Peter Freyther | 906c15e | 2010-05-02 19:28:59 +0800 | [diff] [blame] | 117 | static void send_ping(struct bsc_connection *bsc) |
| 118 | { |
| 119 | static const u_int8_t id_ping[] = { |
| 120 | IPAC_MSGT_PING, |
| 121 | }; |
| 122 | |
| 123 | bsc_send_data(bsc, id_ping, sizeof(id_ping), IPAC_PROTO_IPACCESS); |
| 124 | } |
| 125 | |
Holger Hans Peter Freyther | 5078871 | 2010-06-15 18:51:33 +0800 | [diff] [blame] | 126 | static void send_pong(struct bsc_connection *bsc) |
| 127 | { |
| 128 | static const u_int8_t id_pong[] = { |
| 129 | IPAC_MSGT_PONG, |
| 130 | }; |
| 131 | |
| 132 | bsc_send_data(bsc, id_pong, sizeof(id_pong), IPAC_PROTO_IPACCESS); |
| 133 | } |
| 134 | |
Holger Hans Peter Freyther | 906c15e | 2010-05-02 19:28:59 +0800 | [diff] [blame] | 135 | static void bsc_pong_timeout(void *_bsc) |
| 136 | { |
| 137 | struct bsc_connection *bsc = _bsc; |
| 138 | |
| 139 | LOGP(DNAT, LOGL_ERROR, "BSC Nr: %d PONG timeout.\n", bsc->cfg->nr); |
| 140 | bsc_close_connection(bsc); |
| 141 | } |
| 142 | |
| 143 | static void bsc_ping_timeout(void *_bsc) |
| 144 | { |
| 145 | struct bsc_connection *bsc = _bsc; |
| 146 | |
Holger Hans Peter Freyther | da35a8d | 2010-05-05 16:57:38 +0800 | [diff] [blame] | 147 | if (bsc->nat->ping_timeout < 0) |
| 148 | return; |
| 149 | |
Holger Hans Peter Freyther | 906c15e | 2010-05-02 19:28:59 +0800 | [diff] [blame] | 150 | send_ping(bsc); |
| 151 | |
| 152 | /* send another ping in 20 seconds */ |
Holger Hans Peter Freyther | da35a8d | 2010-05-05 16:57:38 +0800 | [diff] [blame] | 153 | bsc_schedule_timer(&bsc->ping_timeout, bsc->nat->ping_timeout, 0); |
Holger Hans Peter Freyther | 906c15e | 2010-05-02 19:28:59 +0800 | [diff] [blame] | 154 | |
| 155 | /* also start a pong timer */ |
Holger Hans Peter Freyther | da35a8d | 2010-05-05 16:57:38 +0800 | [diff] [blame] | 156 | bsc_schedule_timer(&bsc->pong_timeout, bsc->nat->pong_timeout, 0); |
Holger Hans Peter Freyther | 906c15e | 2010-05-02 19:28:59 +0800 | [diff] [blame] | 157 | } |
| 158 | |
| 159 | static void start_ping_pong(struct bsc_connection *bsc) |
| 160 | { |
| 161 | bsc->pong_timeout.data = bsc; |
| 162 | bsc->pong_timeout.cb = bsc_pong_timeout; |
| 163 | bsc->ping_timeout.data = bsc; |
| 164 | bsc->ping_timeout.cb = bsc_ping_timeout; |
| 165 | |
| 166 | bsc_ping_timeout(bsc); |
| 167 | } |
| 168 | |
Holger Hans Peter Freyther | 3025e19 | 2010-03-26 09:18:02 +0100 | [diff] [blame] | 169 | static void send_id_ack(struct bsc_connection *bsc) |
Holger Hans Peter Freyther | db7ba7d | 2010-03-26 07:41:54 +0100 | [diff] [blame] | 170 | { |
| 171 | static const u_int8_t id_ack[] = { |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 172 | IPAC_MSGT_ID_ACK |
Holger Hans Peter Freyther | db7ba7d | 2010-03-26 07:41:54 +0100 | [diff] [blame] | 173 | }; |
| 174 | |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 175 | bsc_send_data(bsc, id_ack, sizeof(id_ack), IPAC_PROTO_IPACCESS); |
Holger Hans Peter Freyther | db7ba7d | 2010-03-26 07:41:54 +0100 | [diff] [blame] | 176 | } |
| 177 | |
Holger Hans Peter Freyther | 3025e19 | 2010-03-26 09:18:02 +0100 | [diff] [blame] | 178 | static void send_id_req(struct bsc_connection *bsc) |
Holger Hans Peter Freyther | db7ba7d | 2010-03-26 07:41:54 +0100 | [diff] [blame] | 179 | { |
| 180 | static const u_int8_t id_req[] = { |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 181 | IPAC_MSGT_ID_GET, |
Holger Hans Peter Freyther | db7ba7d | 2010-03-26 07:41:54 +0100 | [diff] [blame] | 182 | 0x01, IPAC_IDTAG_UNIT, |
| 183 | 0x01, IPAC_IDTAG_MACADDR, |
| 184 | 0x01, IPAC_IDTAG_LOCATION1, |
| 185 | 0x01, IPAC_IDTAG_LOCATION2, |
| 186 | 0x01, IPAC_IDTAG_EQUIPVERS, |
| 187 | 0x01, IPAC_IDTAG_SWVERSION, |
| 188 | 0x01, IPAC_IDTAG_UNITNAME, |
| 189 | 0x01, IPAC_IDTAG_SERNR, |
| 190 | }; |
| 191 | |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 192 | bsc_send_data(bsc, id_req, sizeof(id_req), IPAC_PROTO_IPACCESS); |
Holger Hans Peter Freyther | db7ba7d | 2010-03-26 07:41:54 +0100 | [diff] [blame] | 193 | } |
| 194 | |
Holger Hans Peter Freyther | 6b087d1 | 2010-04-06 17:32:58 +0200 | [diff] [blame] | 195 | static void nat_send_rlsd(struct sccp_connections *conn) |
| 196 | { |
| 197 | struct sccp_connection_released *rel; |
| 198 | struct msgb *msg; |
| 199 | |
| 200 | msg = msgb_alloc_headroom(4096, 128, "rlsd"); |
| 201 | if (!msg) { |
| 202 | LOGP(DNAT, LOGL_ERROR, "Failed to allocate clear command.\n"); |
| 203 | return; |
| 204 | } |
| 205 | |
| 206 | msg->l2h = msgb_put(msg, sizeof(*rel)); |
| 207 | rel = (struct sccp_connection_released *) msg->l2h; |
| 208 | rel->type = SCCP_MSG_TYPE_RLSD; |
| 209 | rel->release_cause = SCCP_RELEASE_CAUSE_SCCP_FAILURE; |
| 210 | rel->destination_local_reference = conn->remote_ref; |
| 211 | rel->source_local_reference = conn->patched_ref; |
| 212 | |
| 213 | ipaccess_prepend_header(msg, IPAC_PROTO_SCCP); |
| 214 | |
Holger Hans Peter Freyther | aad82ce | 2010-05-11 19:07:39 +0800 | [diff] [blame] | 215 | queue_for_msc(nat->msc_con, msg); |
Holger Hans Peter Freyther | 6b087d1 | 2010-04-06 17:32:58 +0200 | [diff] [blame] | 216 | } |
| 217 | |
Holger Hans Peter Freyther | b8a3373 | 2010-04-08 11:28:12 +0200 | [diff] [blame] | 218 | static void nat_send_rlc(struct sccp_source_reference *src, |
| 219 | struct sccp_source_reference *dst) |
| 220 | { |
| 221 | struct sccp_connection_release_complete *rlc; |
| 222 | struct msgb *msg; |
| 223 | |
| 224 | msg = msgb_alloc_headroom(4096, 128, "rlc"); |
| 225 | if (!msg) { |
| 226 | LOGP(DNAT, LOGL_ERROR, "Failed to allocate clear command.\n"); |
| 227 | return; |
| 228 | } |
| 229 | |
| 230 | msg->l2h = msgb_put(msg, sizeof(*rlc)); |
| 231 | rlc = (struct sccp_connection_release_complete *) msg->l2h; |
| 232 | rlc->type = SCCP_MSG_TYPE_RLC; |
| 233 | rlc->destination_local_reference = *dst; |
| 234 | rlc->source_local_reference = *src; |
| 235 | |
| 236 | ipaccess_prepend_header(msg, IPAC_PROTO_SCCP); |
| 237 | |
Holger Hans Peter Freyther | aad82ce | 2010-05-11 19:07:39 +0800 | [diff] [blame] | 238 | queue_for_msc(nat->msc_con, msg); |
Holger Hans Peter Freyther | b8a3373 | 2010-04-08 11:28:12 +0200 | [diff] [blame] | 239 | } |
| 240 | |
Holger Hans Peter Freyther | d131b79 | 2010-03-31 07:30:58 +0200 | [diff] [blame] | 241 | static void send_mgcp_reset(struct bsc_connection *bsc) |
| 242 | { |
| 243 | static const u_int8_t mgcp_reset[] = { |
| 244 | "RSIP 1 13@mgw MGCP 1.0\r\n" |
| 245 | }; |
| 246 | |
| 247 | bsc_write_mgcp(bsc, mgcp_reset, sizeof mgcp_reset - 1); |
| 248 | } |
| 249 | |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 250 | /* |
| 251 | * Below is the handling of messages coming |
| 252 | * from the MSC and need to be forwarded to |
| 253 | * a real BSC. |
| 254 | */ |
| 255 | static void initialize_msc_if_needed() |
| 256 | { |
Holger Hans Peter Freyther | b752761 | 2010-04-07 11:20:36 +0200 | [diff] [blame] | 257 | if (nat->first_contact) |
| 258 | return; |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 259 | |
Holger Hans Peter Freyther | b752761 | 2010-04-07 11:20:36 +0200 | [diff] [blame] | 260 | nat->first_contact = 1; |
Holger Hans Peter Freyther | aad82ce | 2010-05-11 19:07:39 +0800 | [diff] [blame] | 261 | msc_send_reset(nat->msc_con); |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 262 | } |
| 263 | |
Holger Hans Peter Freyther | e635dab | 2010-05-15 00:14:58 +0800 | [diff] [blame] | 264 | static void send_id_get_response() |
| 265 | { |
| 266 | struct msgb *msg = bsc_msc_id_get_resp(nat->token); |
| 267 | if (!msg) |
| 268 | return; |
| 269 | |
| 270 | ipaccess_prepend_header(msg, IPAC_PROTO_IPACCESS); |
| 271 | queue_for_msc(nat->msc_con, msg); |
| 272 | } |
| 273 | |
Holger Hans Peter Freyther | 3025e19 | 2010-03-26 09:18:02 +0100 | [diff] [blame] | 274 | /* |
| 275 | * Currently we are lacking refcounting so we need to copy each message. |
| 276 | */ |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 277 | static void bsc_send_data(struct bsc_connection *bsc, const u_int8_t *data, unsigned int length, int proto) |
Holger Hans Peter Freyther | f7cb33c | 2010-03-26 07:20:59 +0100 | [diff] [blame] | 278 | { |
Holger Hans Peter Freyther | 3025e19 | 2010-03-26 09:18:02 +0100 | [diff] [blame] | 279 | struct msgb *msg; |
| 280 | |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 281 | if (length > 4096 - 128) { |
Holger Hans Peter Freyther | 3025e19 | 2010-03-26 09:18:02 +0100 | [diff] [blame] | 282 | LOGP(DINP, LOGL_ERROR, "Can not send message of that size.\n"); |
| 283 | return; |
| 284 | } |
| 285 | |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 286 | msg = msgb_alloc_headroom(4096, 128, "to-bsc"); |
Holger Hans Peter Freyther | 3025e19 | 2010-03-26 09:18:02 +0100 | [diff] [blame] | 287 | if (!msg) { |
| 288 | LOGP(DINP, LOGL_ERROR, "Failed to allocate memory for BSC msg.\n"); |
| 289 | return; |
| 290 | } |
| 291 | |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 292 | msg->l2h = msgb_put(msg, length); |
Holger Hans Peter Freyther | 3025e19 | 2010-03-26 09:18:02 +0100 | [diff] [blame] | 293 | memcpy(msg->data, data, length); |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 294 | |
| 295 | bsc_write(bsc, msg, proto); |
Holger Hans Peter Freyther | f7cb33c | 2010-03-26 07:20:59 +0100 | [diff] [blame] | 296 | } |
| 297 | |
Holger Hans Peter Freyther | 91246d7 | 2010-05-16 02:20:26 +0800 | [diff] [blame] | 298 | static void bsc_send_con_refuse(struct bsc_connection *bsc, |
| 299 | struct bsc_nat_parsed *parsed, int con_type) |
| 300 | { |
Holger Hans Peter Freyther | ed775e4 | 2010-06-15 18:52:24 +0800 | [diff] [blame] | 301 | struct msgb *payload; |
Holger Hans Peter Freyther | 91246d7 | 2010-05-16 02:20:26 +0800 | [diff] [blame] | 302 | struct msgb *refuse; |
Holger Hans Peter Freyther | ed775e4 | 2010-06-15 18:52:24 +0800 | [diff] [blame] | 303 | |
| 304 | if (con_type == NAT_CON_TYPE_LU) { |
| 305 | payload = gsm48_create_loc_upd_rej(GSM48_REJECT_PLMN_NOT_ALLOWED); |
| 306 | gsm0808_prepend_dtap_header(payload, 0); |
| 307 | } else if (con_type == NAT_CON_TYPE_CM_SERV_REQ) { |
| 308 | payload = gsm48_create_mm_serv_rej(GSM48_REJECT_PLMN_NOT_ALLOWED); |
| 309 | gsm0808_prepend_dtap_header(payload, 0); |
| 310 | } |
| 311 | |
| 312 | refuse = sccp_create_refuse(parsed->src_local_ref, |
| 313 | SCCP_REFUSAL_SCCP_FAILURE, |
| 314 | payload ? payload->data : NULL, |
| 315 | payload ? payload->len : 0); |
| 316 | |
| 317 | if (payload) |
| 318 | msgb_free(payload); |
| 319 | |
Holger Hans Peter Freyther | 91246d7 | 2010-05-16 02:20:26 +0800 | [diff] [blame] | 320 | if (!refuse) { |
| 321 | LOGP(DNAT, LOGL_ERROR, |
| 322 | "Creating refuse msg failed for SCCP 0x%x on BSC Nr: %d.\n", |
| 323 | sccp_src_ref_to_int(parsed->src_local_ref), bsc->cfg->nr); |
| 324 | return; |
| 325 | } |
| 326 | |
| 327 | bsc_write(bsc, refuse, IPAC_PROTO_SCCP); |
| 328 | } |
| 329 | |
| 330 | |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 331 | static int forward_sccp_to_bts(struct msgb *msg) |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 332 | { |
Holger Hans Peter Freyther | 49c7fb5 | 2010-06-15 18:48:55 +0800 | [diff] [blame] | 333 | struct sccp_connections *con; |
| 334 | struct bsc_connection *bsc; |
Holger Hans Peter Freyther | 0b8f69d | 2010-06-15 18:45:38 +0800 | [diff] [blame] | 335 | struct bsc_nat_parsed *parsed; |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 336 | int proto; |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 337 | |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 338 | /* filter, drop, patch the message? */ |
Holger Hans Peter Freyther | 0b8f69d | 2010-06-15 18:45:38 +0800 | [diff] [blame] | 339 | parsed = bsc_nat_parse(msg); |
| 340 | if (!parsed) { |
| 341 | LOGP(DNAT, LOGL_ERROR, "Can not parse msg from BSC.\n"); |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 342 | return -1; |
Holger Hans Peter Freyther | 0b8f69d | 2010-06-15 18:45:38 +0800 | [diff] [blame] | 343 | } |
| 344 | |
Holger Hans Peter Freyther | 1d6fb18 | 2010-01-30 11:53:30 +0100 | [diff] [blame] | 345 | if (bsc_nat_filter_ipa(DIR_BSC, msg, parsed)) |
Holger Hans Peter Freyther | 0b8f69d | 2010-06-15 18:45:38 +0800 | [diff] [blame] | 346 | goto exit; |
Holger Hans Peter Freyther | 6a97b8d | 2010-06-15 18:45:26 +0800 | [diff] [blame] | 347 | |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 348 | proto = parsed->ipa_proto; |
| 349 | |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 350 | /* Route and modify the SCCP packet */ |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 351 | if (proto == IPAC_PROTO_SCCP) { |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 352 | switch (parsed->sccp_type) { |
| 353 | case SCCP_MSG_TYPE_UDT: |
| 354 | /* forward UDT messages to every BSC */ |
| 355 | goto send_to_all; |
| 356 | break; |
| 357 | case SCCP_MSG_TYPE_RLSD: |
| 358 | case SCCP_MSG_TYPE_CREF: |
| 359 | case SCCP_MSG_TYPE_DT1: |
Holger Hans Peter Freyther | f46ce53 | 2010-04-06 10:22:34 +0200 | [diff] [blame] | 360 | case SCCP_MSG_TYPE_IT: |
Holger Hans Peter Freyther | 49c7fb5 | 2010-06-15 18:48:55 +0800 | [diff] [blame] | 361 | con = patch_sccp_src_ref_to_bsc(msg, parsed, nat); |
Holger Hans Peter Freyther | 465313e | 2010-06-15 18:49:53 +0800 | [diff] [blame] | 362 | if (parsed->gsm_type == BSS_MAP_MSG_ASSIGMENT_RQST) { |
Holger Hans Peter Freyther | d470286 | 2010-04-12 12:17:09 +0200 | [diff] [blame] | 363 | counter_inc(nat->stats.sccp.calls); |
| 364 | |
Holger Hans Peter Freyther | 465313e | 2010-06-15 18:49:53 +0800 | [diff] [blame] | 365 | if (con) { |
Holger Hans Peter Freyther | 3d0049f | 2010-04-18 01:35:41 +0800 | [diff] [blame] | 366 | counter_inc(con->bsc->cfg->stats.sccp.calls); |
Holger Hans Peter Freyther | 465313e | 2010-06-15 18:49:53 +0800 | [diff] [blame] | 367 | if (bsc_mgcp_assign(con, msg) != 0) |
| 368 | LOGP(DNAT, LOGL_ERROR, "Failed to assign...\n"); |
| 369 | } else |
| 370 | LOGP(DNAT, LOGL_ERROR, "Assignment command but no BSC.\n"); |
| 371 | } |
Holger Hans Peter Freyther | 16a6f70 | 2010-03-29 17:18:42 +0200 | [diff] [blame] | 372 | break; |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 373 | case SCCP_MSG_TYPE_CC: |
Holger Hans Peter Freyther | 49c7fb5 | 2010-06-15 18:48:55 +0800 | [diff] [blame] | 374 | con = patch_sccp_src_ref_to_bsc(msg, parsed, nat); |
| 375 | if (!con || update_sccp_src_ref(con, parsed) != 0) |
Holger Hans Peter Freyther | 16a6f70 | 2010-03-29 17:18:42 +0200 | [diff] [blame] | 376 | goto exit; |
Holger Hans Peter Freyther | 0ab6bab | 2010-06-15 18:47:49 +0800 | [diff] [blame] | 377 | break; |
| 378 | case SCCP_MSG_TYPE_RLC: |
| 379 | LOGP(DNAT, LOGL_ERROR, "Unexpected release complete from MSC.\n"); |
| 380 | goto exit; |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 381 | break; |
| 382 | case SCCP_MSG_TYPE_CR: |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 383 | /* MSC never opens a SCCP connection, fall through */ |
| 384 | default: |
| 385 | goto exit; |
| 386 | } |
Holger Hans Peter Freyther | f464ea5 | 2010-04-06 16:07:44 +0200 | [diff] [blame] | 387 | |
Holger Hans Peter Freyther | b8a3373 | 2010-04-08 11:28:12 +0200 | [diff] [blame] | 388 | if (!con && parsed->sccp_type == SCCP_MSG_TYPE_RLSD) { |
| 389 | LOGP(DNAT, LOGL_NOTICE, "Sending fake RLC on RLSD message to network.\n"); |
| 390 | /* Exchange src/dest for the reply */ |
| 391 | nat_send_rlc(parsed->dest_local_ref, parsed->src_local_ref); |
| 392 | } else if (!con) |
Holger Hans Peter Freyther | 5f10c6d | 2010-05-15 19:13:52 +0800 | [diff] [blame] | 393 | LOGP(DNAT, LOGL_ERROR, "Unknown connection for msg type: 0x%x from the MSC.\n", parsed->sccp_type); |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 394 | } |
| 395 | |
| 396 | talloc_free(parsed); |
Holger Hans Peter Freyther | 49c7fb5 | 2010-06-15 18:48:55 +0800 | [diff] [blame] | 397 | if (!con) |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 398 | return -1; |
Holger Hans Peter Freyther | 49c7fb5 | 2010-06-15 18:48:55 +0800 | [diff] [blame] | 399 | if (!con->bsc->authenticated) { |
Holger Hans Peter Freyther | 6c45f2e | 2010-06-15 19:06:18 +0800 | [diff] [blame] | 400 | LOGP(DNAT, LOGL_ERROR, "Selected BSC not authenticated.\n"); |
Holger Hans Peter Freyther | 3f37b8f | 2010-02-08 23:24:32 +0100 | [diff] [blame] | 401 | return -1; |
| 402 | } |
| 403 | |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 404 | bsc_send_data(con->bsc, msg->l2h, msgb_l2len(msg), proto); |
Holger Hans Peter Freyther | 3025e19 | 2010-03-26 09:18:02 +0100 | [diff] [blame] | 405 | return 0; |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 406 | |
| 407 | send_to_all: |
Holger Hans Peter Freyther | 45d1181 | 2010-06-15 18:46:36 +0800 | [diff] [blame] | 408 | /* |
| 409 | * Filter Paging from the network. We do not want to send a PAGING |
| 410 | * Command to every BSC in our network. We will analys the PAGING |
| 411 | * message and then send it to the authenticated messages... |
| 412 | */ |
| 413 | if (parsed->ipa_proto == IPAC_PROTO_SCCP && parsed->gsm_type == BSS_MAP_MSG_PAGING) { |
Holger Hans Peter Freyther | 979a309 | 2010-04-17 08:07:19 +0200 | [diff] [blame] | 414 | int lac; |
| 415 | bsc = bsc_nat_find_bsc(nat, msg, &lac); |
Holger Hans Peter Freyther | 62e5843 | 2010-04-21 19:05:14 +0800 | [diff] [blame] | 416 | if (bsc && bsc->cfg->forbid_paging) |
Holger Hans Peter Freyther | a34585e | 2010-04-21 20:17:18 +0800 | [diff] [blame] | 417 | LOGP(DNAT, LOGL_DEBUG, "Paging forbidden for BTS: %d\n", bsc->cfg->nr); |
Holger Hans Peter Freyther | 62e5843 | 2010-04-21 19:05:14 +0800 | [diff] [blame] | 418 | else if (bsc) |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 419 | bsc_send_data(bsc, msg->l2h, msgb_l2len(msg), parsed->ipa_proto); |
Holger Hans Peter Freyther | bae9da4 | 2010-03-30 05:57:42 +0200 | [diff] [blame] | 420 | else |
Holger Hans Peter Freyther | 979a309 | 2010-04-17 08:07:19 +0200 | [diff] [blame] | 421 | LOGP(DNAT, LOGL_ERROR, "Could not determine BSC for paging on lac: %d/0x%x\n", |
| 422 | lac, lac); |
Holger Hans Peter Freyther | 45d1181 | 2010-06-15 18:46:36 +0800 | [diff] [blame] | 423 | |
| 424 | goto exit; |
| 425 | } |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 426 | /* currently send this to every BSC connected */ |
Holger Hans Peter Freyther | 9a85ef3 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 427 | llist_for_each_entry(bsc, &nat->bsc_connections, list_entry) { |
Holger Hans Peter Freyther | 3f37b8f | 2010-02-08 23:24:32 +0100 | [diff] [blame] | 428 | if (!bsc->authenticated) |
| 429 | continue; |
| 430 | |
Holger Hans Peter Freyther | 2896df7 | 2010-04-08 10:24:57 +0200 | [diff] [blame] | 431 | bsc_send_data(bsc, msg->l2h, msgb_l2len(msg), parsed->ipa_proto); |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 432 | } |
Holger Hans Peter Freyther | 0b8f69d | 2010-06-15 18:45:38 +0800 | [diff] [blame] | 433 | |
| 434 | exit: |
| 435 | talloc_free(parsed); |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 436 | return 0; |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 437 | } |
| 438 | |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 439 | static void msc_connection_was_lost(struct bsc_msc_connection *con) |
| 440 | { |
Holger Hans Peter Freyther | cd89537 | 2010-03-29 08:04:09 +0200 | [diff] [blame] | 441 | struct bsc_connection *bsc, *tmp; |
| 442 | |
Holger Hans Peter Freyther | a4ed81c | 2010-04-12 12:35:02 +0200 | [diff] [blame] | 443 | counter_inc(nat->stats.msc.reconn); |
| 444 | |
Holger Hans Peter Freyther | cd89537 | 2010-03-29 08:04:09 +0200 | [diff] [blame] | 445 | LOGP(DMSC, LOGL_ERROR, "Closing all connections downstream.\n"); |
| 446 | llist_for_each_entry_safe(bsc, tmp, &nat->bsc_connections, list_entry) |
Holger Hans Peter Freyther | 2f9dcf0 | 2010-04-27 13:21:39 +0800 | [diff] [blame] | 447 | bsc_close_connection(bsc); |
Holger Hans Peter Freyther | cd89537 | 2010-03-29 08:04:09 +0200 | [diff] [blame] | 448 | |
Holger Hans Peter Freyther | b752761 | 2010-04-07 11:20:36 +0200 | [diff] [blame] | 449 | nat->first_contact = 0; |
Holger Hans Peter Freyther | 241e130 | 2010-03-31 09:16:56 +0200 | [diff] [blame] | 450 | bsc_mgcp_free_endpoints(nat); |
Holger Hans Peter Freyther | cd89537 | 2010-03-29 08:04:09 +0200 | [diff] [blame] | 451 | bsc_msc_schedule_connect(con); |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 452 | } |
| 453 | |
Holger Hans Peter Freyther | 02aee14 | 2010-04-08 10:31:07 +0200 | [diff] [blame] | 454 | static void msc_send_reset(struct bsc_msc_connection *msc_con) |
Holger Hans Peter Freyther | af0ff6c | 2010-04-07 10:46:30 +0200 | [diff] [blame] | 455 | { |
| 456 | static const u_int8_t reset[] = { |
Holger Hans Peter Freyther | 7cab166 | 2010-04-07 11:11:11 +0200 | [diff] [blame] | 457 | 0x00, 0x12, 0xfd, |
Holger Hans Peter Freyther | af0ff6c | 2010-04-07 10:46:30 +0200 | [diff] [blame] | 458 | 0x09, 0x00, 0x03, 0x05, 0x07, 0x02, 0x42, 0xfe, |
| 459 | 0x02, 0x42, 0xfe, 0x06, 0x00, 0x04, 0x30, 0x04, |
| 460 | 0x01, 0x20 |
| 461 | }; |
| 462 | |
| 463 | struct msgb *msg; |
| 464 | |
| 465 | msg = msgb_alloc_headroom(4096, 128, "08.08 reset"); |
| 466 | if (!msg) { |
| 467 | LOGP(DMSC, LOGL_ERROR, "Failed to allocate reset msg.\n"); |
| 468 | return; |
| 469 | } |
| 470 | |
| 471 | msg->l2h = msgb_put(msg, sizeof(reset)); |
| 472 | memcpy(msg->l2h, reset, msgb_l2len(msg)); |
| 473 | |
Holger Hans Peter Freyther | aad82ce | 2010-05-11 19:07:39 +0800 | [diff] [blame] | 474 | queue_for_msc(nat->msc_con, msg); |
Holger Hans Peter Freyther | af0ff6c | 2010-04-07 10:46:30 +0200 | [diff] [blame] | 475 | |
| 476 | LOGP(DMSC, LOGL_NOTICE, "Scheduled GSM0808 reset msg for the MSC.\n"); |
| 477 | } |
| 478 | |
Holger Hans Peter Freyther | 6f5fbfd | 2010-06-15 18:47:02 +0800 | [diff] [blame] | 479 | static int ipaccess_msc_read_cb(struct bsc_fd *bfd) |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 480 | { |
| 481 | int error; |
| 482 | struct msgb *msg = ipaccess_read_msg(bfd, &error); |
| 483 | struct ipaccess_head *hh; |
| 484 | |
| 485 | if (!msg) { |
Holger Hans Peter Freyther | 9db7843 | 2010-04-23 00:23:03 +0800 | [diff] [blame] | 486 | if (error == 0) |
Holger Hans Peter Freyther | 418f394 | 2010-01-29 05:58:43 +0100 | [diff] [blame] | 487 | LOGP(DNAT, LOGL_FATAL, "The connection the MSC was lost, exiting\n"); |
Holger Hans Peter Freyther | 9db7843 | 2010-04-23 00:23:03 +0800 | [diff] [blame] | 488 | else |
| 489 | LOGP(DNAT, LOGL_ERROR, "Failed to parse ip access message: %d\n", error); |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 490 | |
Holger Hans Peter Freyther | aad82ce | 2010-05-11 19:07:39 +0800 | [diff] [blame] | 491 | bsc_msc_lost(nat->msc_con); |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 492 | return -1; |
| 493 | } |
| 494 | |
Holger Hans Peter Freyther | 418f394 | 2010-01-29 05:58:43 +0100 | [diff] [blame] | 495 | LOGP(DNAT, LOGL_DEBUG, "MSG from MSC: %s proto: %d\n", hexdump(msg->data, msg->len), msg->l2h[0]); |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 496 | |
| 497 | /* handle base message handling */ |
| 498 | hh = (struct ipaccess_head *) msg->data; |
| 499 | ipaccess_rcvmsg_base(msg, bfd); |
| 500 | |
| 501 | /* initialize the networking. This includes sending a GSM08.08 message */ |
Holger Hans Peter Freyther | e635dab | 2010-05-15 00:14:58 +0800 | [diff] [blame] | 502 | if (hh->proto == IPAC_PROTO_IPACCESS) { |
| 503 | if (msg->l2h[0] == IPAC_MSGT_ID_ACK) |
| 504 | initialize_msc_if_needed(); |
| 505 | else if (msg->l2h[0] == IPAC_MSGT_ID_GET) |
| 506 | send_id_get_response(); |
| 507 | } else if (hh->proto == IPAC_PROTO_SCCP) |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 508 | forward_sccp_to_bts(msg); |
| 509 | |
Holger Hans Peter Freyther | aad68b5 | 2010-06-15 18:46:48 +0800 | [diff] [blame] | 510 | msgb_free(msg); |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 511 | return 0; |
| 512 | } |
Holger Hans Peter Freyther | 9e2c5f5 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 513 | |
Holger Hans Peter Freyther | 6f5fbfd | 2010-06-15 18:47:02 +0800 | [diff] [blame] | 514 | static int ipaccess_msc_write_cb(struct bsc_fd *bfd, struct msgb *msg) |
| 515 | { |
| 516 | int rc; |
| 517 | rc = write(bfd->fd, msg->data, msg->len); |
| 518 | |
| 519 | if (rc != msg->len) { |
| 520 | LOGP(DNAT, LOGL_ERROR, "Failed to write MSG to MSC.\n"); |
| 521 | return -1; |
| 522 | } |
| 523 | |
| 524 | return rc; |
| 525 | } |
| 526 | |
Holger Hans Peter Freyther | 49d8068 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 527 | /* |
| 528 | * Below is the handling of messages coming |
| 529 | * from the BSC and need to be forwarded to |
| 530 | * a real BSC. |
| 531 | */ |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 532 | |
| 533 | /* |
| 534 | * Remove the connection from the connections list, |
| 535 | * remove it from the patching of SCCP header lists |
| 536 | * as well. Maybe in the future even close connection.. |
| 537 | */ |
Holger Hans Peter Freyther | 2f9dcf0 | 2010-04-27 13:21:39 +0800 | [diff] [blame] | 538 | void bsc_close_connection(struct bsc_connection *connection) |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 539 | { |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 540 | struct sccp_connections *sccp_patch, *tmp; |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 541 | |
Holger Hans Peter Freyther | aa69824 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 542 | /* stop the timeout timer */ |
| 543 | bsc_del_timer(&connection->id_timeout); |
Holger Hans Peter Freyther | 906c15e | 2010-05-02 19:28:59 +0800 | [diff] [blame] | 544 | bsc_del_timer(&connection->ping_timeout); |
| 545 | bsc_del_timer(&connection->pong_timeout); |
Holger Hans Peter Freyther | aa69824 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 546 | |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 547 | /* remove all SCCP connections */ |
Holger Hans Peter Freyther | 9a85ef3 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 548 | llist_for_each_entry_safe(sccp_patch, tmp, &nat->sccp_connections, list_entry) { |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 549 | if (sccp_patch->bsc != connection) |
| 550 | continue; |
| 551 | |
Holger Hans Peter Freyther | 4c683d1 | 2010-04-23 14:13:27 +0800 | [diff] [blame] | 552 | if (sccp_patch->has_remote_ref) |
| 553 | nat_send_rlsd(sccp_patch); |
Holger Hans Peter Freyther | 23fe7be | 2010-03-30 10:45:48 +0200 | [diff] [blame] | 554 | sccp_connection_destroy(sccp_patch); |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 555 | } |
| 556 | |
Holger Hans Peter Freyther | 26a4389 | 2010-04-05 23:09:27 +0200 | [diff] [blame] | 557 | /* close endpoints allocated by this BSC */ |
| 558 | bsc_mgcp_clear_endpoints_for(connection); |
| 559 | |
Holger Hans Peter Freyther | e464ed4 | 2010-04-22 12:04:36 +0800 | [diff] [blame] | 560 | bsc_unregister_fd(&connection->write_queue.bfd); |
| 561 | close(connection->write_queue.bfd.fd); |
| 562 | write_queue_clear(&connection->write_queue); |
| 563 | llist_del(&connection->list_entry); |
| 564 | |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 565 | talloc_free(connection); |
| 566 | } |
| 567 | |
Holger Hans Peter Freyther | aa69824 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 568 | static void ipaccess_close_bsc(void *data) |
| 569 | { |
Holger Hans Peter Freyther | 6d5a600 | 2010-04-17 07:58:17 +0200 | [diff] [blame] | 570 | struct sockaddr_in sock; |
| 571 | socklen_t len = sizeof(sock); |
Holger Hans Peter Freyther | aa69824 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 572 | struct bsc_connection *conn = data; |
| 573 | |
Holger Hans Peter Freyther | 6d5a600 | 2010-04-17 07:58:17 +0200 | [diff] [blame] | 574 | |
| 575 | getpeername(conn->write_queue.bfd.fd, (struct sockaddr *) &sock, &len); |
| 576 | LOGP(DNAT, LOGL_ERROR, "BSC on %s didn't respond to identity request. Closing.\n", |
| 577 | inet_ntoa(sock.sin_addr)); |
Holger Hans Peter Freyther | 2f9dcf0 | 2010-04-27 13:21:39 +0800 | [diff] [blame] | 578 | bsc_close_connection(conn); |
Holger Hans Peter Freyther | aa69824 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 579 | } |
| 580 | |
| 581 | static void ipaccess_auth_bsc(struct tlv_parsed *tvp, struct bsc_connection *bsc) |
| 582 | { |
| 583 | struct bsc_config *conf; |
| 584 | const char* token = (const char *) TLVP_VAL(tvp, IPAC_IDTAG_UNITNAME); |
| 585 | |
Holger Hans Peter Freyther | 5cdcfa6 | 2010-05-02 18:58:10 +0800 | [diff] [blame] | 586 | if (bsc->cfg) { |
| 587 | LOGP(DNAT, LOGL_ERROR, "Reauth on fd %d bsc nr %d\n", |
| 588 | bsc->write_queue.bfd.fd, bsc->cfg->nr); |
| 589 | return; |
| 590 | } |
| 591 | |
Holger Hans Peter Freyther | aa69824 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 592 | llist_for_each_entry(conf, &bsc->nat->bsc_configs, entry) { |
| 593 | if (strcmp(conf->token, token) == 0) { |
Holger Hans Peter Freyther | d470286 | 2010-04-12 12:17:09 +0200 | [diff] [blame] | 594 | counter_inc(conf->stats.net.reconn); |
Holger Hans Peter Freyther | aa69824 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 595 | bsc->authenticated = 1; |
Holger Hans Peter Freyther | 47dd494 | 2010-04-06 15:11:34 +0200 | [diff] [blame] | 596 | bsc->cfg = conf; |
Holger Hans Peter Freyther | aa69824 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 597 | bsc_del_timer(&bsc->id_timeout); |
Holger Hans Peter Freyther | 74cfab7 | 2010-05-05 17:03:44 +0800 | [diff] [blame] | 598 | LOGP(DNAT, LOGL_NOTICE, "Authenticated bsc nr: %d lac: %d on fd %d\n", |
| 599 | conf->nr, conf->lac, bsc->write_queue.bfd.fd); |
Holger Hans Peter Freyther | 906c15e | 2010-05-02 19:28:59 +0800 | [diff] [blame] | 600 | start_ping_pong(bsc); |
Holger Hans Peter Freyther | c615c26 | 2010-04-17 07:59:57 +0200 | [diff] [blame] | 601 | return; |
Holger Hans Peter Freyther | aa69824 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 602 | } |
| 603 | } |
Holger Hans Peter Freyther | c615c26 | 2010-04-17 07:59:57 +0200 | [diff] [blame] | 604 | |
Holger Hans Peter Freyther | 74cfab7 | 2010-05-05 17:03:44 +0800 | [diff] [blame] | 605 | LOGP(DNAT, LOGL_ERROR, "No bsc found for token %s on fd: %d.\n", token, |
| 606 | bsc->write_queue.bfd.fd); |
Holger Hans Peter Freyther | aa69824 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 607 | } |
| 608 | |
Holger Hans Peter Freyther | 747d654 | 2010-03-26 07:24:34 +0100 | [diff] [blame] | 609 | static int forward_sccp_to_msc(struct bsc_connection *bsc, struct msgb *msg) |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 610 | { |
Holger Hans Peter Freyther | 605f62a | 2010-05-16 16:30:42 +0800 | [diff] [blame^] | 611 | int con_found = 0; |
| 612 | struct bsc_connection *con_bsc = NULL; |
Holger Hans Peter Freyther | 19c0a84 | 2010-05-16 02:00:40 +0800 | [diff] [blame] | 613 | int con_type; |
Holger Hans Peter Freyther | 0b8f69d | 2010-06-15 18:45:38 +0800 | [diff] [blame] | 614 | struct bsc_nat_parsed *parsed; |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 615 | |
Holger Hans Peter Freyther | 0b8f69d | 2010-06-15 18:45:38 +0800 | [diff] [blame] | 616 | /* Parse and filter messages */ |
| 617 | parsed = bsc_nat_parse(msg); |
| 618 | if (!parsed) { |
| 619 | LOGP(DNAT, LOGL_ERROR, "Can not parse msg from BSC.\n"); |
Holger Hans Peter Freyther | d7657ff | 2010-03-30 07:35:46 +0200 | [diff] [blame] | 620 | msgb_free(msg); |
Holger Hans Peter Freyther | 0b8f69d | 2010-06-15 18:45:38 +0800 | [diff] [blame] | 621 | return -1; |
| 622 | } |
| 623 | |
Holger Hans Peter Freyther | 1d6fb18 | 2010-01-30 11:53:30 +0100 | [diff] [blame] | 624 | if (bsc_nat_filter_ipa(DIR_MSC, msg, parsed)) |
Holger Hans Peter Freyther | 0b8f69d | 2010-06-15 18:45:38 +0800 | [diff] [blame] | 625 | goto exit; |
Holger Hans Peter Freyther | 6a97b8d | 2010-06-15 18:45:26 +0800 | [diff] [blame] | 626 | |
Holger Hans Peter Freyther | bbb9d39 | 2010-04-02 03:42:44 +0200 | [diff] [blame] | 627 | /* |
| 628 | * check authentication after filtering to not reject auth |
| 629 | * responses coming from the BSC. We have to make sure that |
| 630 | * nothing from the exit path will forward things to the MSC |
| 631 | */ |
| 632 | if (!bsc->authenticated) { |
| 633 | LOGP(DNAT, LOGL_ERROR, "BSC is not authenticated.\n"); |
| 634 | msgb_free(msg); |
| 635 | return -1; |
| 636 | } |
| 637 | |
| 638 | |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 639 | /* modify the SCCP entries */ |
| 640 | if (parsed->ipa_proto == IPAC_PROTO_SCCP) { |
Holger Hans Peter Freyther | 605f62a | 2010-05-16 16:30:42 +0800 | [diff] [blame^] | 641 | struct sccp_connections *con; |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 642 | switch (parsed->sccp_type) { |
| 643 | case SCCP_MSG_TYPE_CR: |
Holger Hans Peter Freyther | 19c0a84 | 2010-05-16 02:00:40 +0800 | [diff] [blame] | 644 | if (bsc_nat_filter_sccp_cr(bsc, msg, parsed, &con_type) != 0) |
Holger Hans Peter Freyther | b4af5c9 | 2010-05-14 03:39:56 +0800 | [diff] [blame] | 645 | goto exit3; |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 646 | if (create_sccp_src_ref(bsc, msg, parsed) != 0) |
| 647 | goto exit2; |
Holger Hans Peter Freyther | b5513ca | 2010-04-21 18:56:12 +0800 | [diff] [blame] | 648 | con = patch_sccp_src_ref_to_msc(msg, parsed, bsc); |
Holger Hans Peter Freyther | 234d312 | 2010-05-16 02:06:11 +0800 | [diff] [blame] | 649 | con->con_type = con_type; |
Holger Hans Peter Freyther | 605f62a | 2010-05-16 16:30:42 +0800 | [diff] [blame^] | 650 | con_found = 1; |
| 651 | con_bsc = con->bsc; |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 652 | break; |
| 653 | case SCCP_MSG_TYPE_RLSD: |
| 654 | case SCCP_MSG_TYPE_CREF: |
| 655 | case SCCP_MSG_TYPE_DT1: |
| 656 | case SCCP_MSG_TYPE_CC: |
Holger Hans Peter Freyther | f46ce53 | 2010-04-06 10:22:34 +0200 | [diff] [blame] | 657 | case SCCP_MSG_TYPE_IT: |
Holger Hans Peter Freyther | b5513ca | 2010-04-21 18:56:12 +0800 | [diff] [blame] | 658 | con = patch_sccp_src_ref_to_msc(msg, parsed, bsc); |
Holger Hans Peter Freyther | 605f62a | 2010-05-16 16:30:42 +0800 | [diff] [blame^] | 659 | if (con) { |
| 660 | con_found = 1; |
| 661 | con_bsc = con->bsc; |
| 662 | } |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 663 | break; |
| 664 | case SCCP_MSG_TYPE_RLC: |
Holger Hans Peter Freyther | b5513ca | 2010-04-21 18:56:12 +0800 | [diff] [blame] | 665 | con = patch_sccp_src_ref_to_msc(msg, parsed, bsc); |
Holger Hans Peter Freyther | 605f62a | 2010-05-16 16:30:42 +0800 | [diff] [blame^] | 666 | if (con) { |
| 667 | con_found = 1; |
| 668 | con_bsc = con->bsc; |
| 669 | } |
Holger Hans Peter Freyther | f4cfc4f | 2010-03-31 09:15:05 +0200 | [diff] [blame] | 670 | remove_sccp_src_ref(bsc, msg, parsed); |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 671 | break; |
| 672 | case SCCP_MSG_TYPE_UDT: |
| 673 | /* simply forward everything */ |
Holger Hans Peter Freyther | 49c7fb5 | 2010-06-15 18:48:55 +0800 | [diff] [blame] | 674 | con = NULL; |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 675 | break; |
| 676 | default: |
Holger Hans Peter Freyther | 0ab6bab | 2010-06-15 18:47:49 +0800 | [diff] [blame] | 677 | LOGP(DNAT, LOGL_ERROR, "Not forwarding to msc sccp type: 0x%x\n", parsed->sccp_type); |
Holger Hans Peter Freyther | 49c7fb5 | 2010-06-15 18:48:55 +0800 | [diff] [blame] | 678 | con = NULL; |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 679 | goto exit2; |
| 680 | break; |
| 681 | } |
Holger Hans Peter Freyther | 3c3bce1 | 2010-04-01 10:16:28 +0200 | [diff] [blame] | 682 | } else if (parsed->ipa_proto == NAT_IPAC_PROTO_MGCP) { |
| 683 | bsc_mgcp_forward(bsc, msg); |
| 684 | goto exit2; |
Holger Hans Peter Freyther | 49c7fb5 | 2010-06-15 18:48:55 +0800 | [diff] [blame] | 685 | } else { |
| 686 | LOGP(DNAT, LOGL_ERROR, "Not forwarding unknown stream id: 0x%x\n", parsed->ipa_proto); |
| 687 | goto exit2; |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 688 | } |
| 689 | |
Holger Hans Peter Freyther | 605f62a | 2010-05-16 16:30:42 +0800 | [diff] [blame^] | 690 | if (con_found && con_bsc != bsc) { |
Holger Hans Peter Freyther | ca0c2f9 | 2010-04-21 18:49:55 +0800 | [diff] [blame] | 691 | LOGP(DNAT, LOGL_ERROR, "The connection belongs to a different BTS: input: %d con: %d\n", |
Holger Hans Peter Freyther | 605f62a | 2010-05-16 16:30:42 +0800 | [diff] [blame^] | 692 | bsc->cfg->nr, con_bsc->cfg->nr); |
Holger Hans Peter Freyther | 058eeb7 | 2010-01-31 09:46:21 +0100 | [diff] [blame] | 693 | goto exit2; |
| 694 | } |
| 695 | |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 696 | /* send the non-filtered but maybe modified msg */ |
Holger Hans Peter Freyther | aad82ce | 2010-05-11 19:07:39 +0800 | [diff] [blame] | 697 | queue_for_msc(nat->msc_con, msg); |
Holger Hans Peter Freyther | 38a77d0 | 2010-01-30 12:45:10 +0100 | [diff] [blame] | 698 | talloc_free(parsed); |
Holger Hans Peter Freyther | 6f5fbfd | 2010-06-15 18:47:02 +0800 | [diff] [blame] | 699 | return 0; |
Holger Hans Peter Freyther | 0b8f69d | 2010-06-15 18:45:38 +0800 | [diff] [blame] | 700 | |
| 701 | exit: |
Holger Hans Peter Freyther | 38a77d0 | 2010-01-30 12:45:10 +0100 | [diff] [blame] | 702 | /* if we filter out the reset send an ack to the BSC */ |
| 703 | if (parsed->bssap == 0 && parsed->gsm_type == BSS_MAP_MSG_RESET) { |
Holger Hans Peter Freyther | 747d654 | 2010-03-26 07:24:34 +0100 | [diff] [blame] | 704 | send_reset_ack(bsc); |
| 705 | send_reset_ack(bsc); |
Holger Hans Peter Freyther | aa69824 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 706 | } else if (parsed->ipa_proto == IPAC_PROTO_IPACCESS) { |
| 707 | /* do we know who is handling this? */ |
| 708 | if (msg->l2h[0] == IPAC_MSGT_ID_RESP) { |
| 709 | struct tlv_parsed tvp; |
| 710 | ipaccess_idtag_parse(&tvp, |
| 711 | (unsigned char *) msg->l2h + 2, |
| 712 | msgb_l2len(msg) - 2); |
| 713 | if (TLVP_PRESENT(&tvp, IPAC_IDTAG_UNITNAME)) |
| 714 | ipaccess_auth_bsc(&tvp, bsc); |
| 715 | } |
| 716 | |
| 717 | goto exit2; |
Holger Hans Peter Freyther | 38a77d0 | 2010-01-30 12:45:10 +0100 | [diff] [blame] | 718 | } |
| 719 | |
Holger Hans Peter Freyther | 1498d2e | 2010-05-15 00:29:50 +0800 | [diff] [blame] | 720 | exit2: |
| 721 | talloc_free(parsed); |
| 722 | msgb_free(msg); |
| 723 | return -1; |
| 724 | |
Holger Hans Peter Freyther | b4af5c9 | 2010-05-14 03:39:56 +0800 | [diff] [blame] | 725 | exit3: |
| 726 | /* send a SCCP Connection Refused */ |
Holger Hans Peter Freyther | 91246d7 | 2010-05-16 02:20:26 +0800 | [diff] [blame] | 727 | bsc_send_con_refuse(bsc, parsed, con_type); |
Holger Hans Peter Freyther | 0b8f69d | 2010-06-15 18:45:38 +0800 | [diff] [blame] | 728 | talloc_free(parsed); |
Holger Hans Peter Freyther | 6f5fbfd | 2010-06-15 18:47:02 +0800 | [diff] [blame] | 729 | msgb_free(msg); |
| 730 | return -1; |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 731 | } |
| 732 | |
Holger Hans Peter Freyther | ed07a3f | 2010-06-15 18:47:10 +0800 | [diff] [blame] | 733 | static int ipaccess_bsc_read_cb(struct bsc_fd *bfd) |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 734 | { |
| 735 | int error; |
Holger Hans Peter Freyther | 747d654 | 2010-03-26 07:24:34 +0100 | [diff] [blame] | 736 | struct bsc_connection *bsc = bfd->data; |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 737 | struct msgb *msg = ipaccess_read_msg(bfd, &error); |
Holger Hans Peter Freyther | 5078871 | 2010-06-15 18:51:33 +0800 | [diff] [blame] | 738 | struct ipaccess_head *hh; |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 739 | |
| 740 | if (!msg) { |
Holger Hans Peter Freyther | 9db7843 | 2010-04-23 00:23:03 +0800 | [diff] [blame] | 741 | if (error == 0) |
Holger Hans Peter Freyther | 19c3544 | 2010-05-01 10:37:15 +0800 | [diff] [blame] | 742 | LOGP(DNAT, LOGL_ERROR, |
| 743 | "The connection to the BSC Nr: %d was lost. Cleaning it\n", |
| 744 | bsc->cfg ? bsc->cfg->nr : -1); |
Holger Hans Peter Freyther | 9db7843 | 2010-04-23 00:23:03 +0800 | [diff] [blame] | 745 | else |
Holger Hans Peter Freyther | 19c3544 | 2010-05-01 10:37:15 +0800 | [diff] [blame] | 746 | LOGP(DNAT, LOGL_ERROR, |
| 747 | "Stream error on BSC Nr: %d. Failed to parse ip access message: %d\n", |
| 748 | bsc->cfg ? bsc->cfg->nr : -1, error); |
Holger Hans Peter Freyther | 9db7843 | 2010-04-23 00:23:03 +0800 | [diff] [blame] | 749 | |
Holger Hans Peter Freyther | 2f9dcf0 | 2010-04-27 13:21:39 +0800 | [diff] [blame] | 750 | bsc_close_connection(bsc); |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 751 | return -1; |
| 752 | } |
| 753 | |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 754 | |
Holger Hans Peter Freyther | 418f394 | 2010-01-29 05:58:43 +0100 | [diff] [blame] | 755 | LOGP(DNAT, LOGL_DEBUG, "MSG from BSC: %s proto: %d\n", hexdump(msg->data, msg->len), msg->l2h[0]); |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 756 | |
| 757 | /* Handle messages from the BSC */ |
Holger Hans Peter Freyther | 5078871 | 2010-06-15 18:51:33 +0800 | [diff] [blame] | 758 | hh = (struct ipaccess_head *) msg->data; |
Holger Hans Peter Freyther | 906c15e | 2010-05-02 19:28:59 +0800 | [diff] [blame] | 759 | |
Holger Hans Peter Freyther | 5078871 | 2010-06-15 18:51:33 +0800 | [diff] [blame] | 760 | /* stop the pong timeout */ |
| 761 | if (hh->proto == IPAC_PROTO_IPACCESS) { |
| 762 | if (msg->l2h[0] == IPAC_MSGT_PONG) { |
Holger Hans Peter Freyther | 906c15e | 2010-05-02 19:28:59 +0800 | [diff] [blame] | 763 | bsc_del_timer(&bsc->pong_timeout); |
| 764 | msgb_free(msg); |
| 765 | return 0; |
Holger Hans Peter Freyther | 5078871 | 2010-06-15 18:51:33 +0800 | [diff] [blame] | 766 | } else if (msg->l2h[0] == IPAC_MSGT_PING) { |
| 767 | send_pong(bsc); |
| 768 | msgb_free(msg); |
| 769 | return 0; |
Holger Hans Peter Freyther | 906c15e | 2010-05-02 19:28:59 +0800 | [diff] [blame] | 770 | } |
| 771 | } |
| 772 | |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 773 | /* FIXME: Currently no PONG is sent to the BSC */ |
| 774 | /* FIXME: Currently no ID ACK is sent to the BSC */ |
Holger Hans Peter Freyther | 747d654 | 2010-03-26 07:24:34 +0100 | [diff] [blame] | 775 | forward_sccp_to_msc(bsc, msg); |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 776 | |
| 777 | return 0; |
| 778 | } |
| 779 | |
Holger Hans Peter Freyther | 3025e19 | 2010-03-26 09:18:02 +0100 | [diff] [blame] | 780 | static int ipaccess_bsc_write_cb(struct bsc_fd *bfd, struct msgb *msg) |
| 781 | { |
| 782 | int rc; |
| 783 | |
| 784 | rc = write(bfd->fd, msg->data, msg->len); |
| 785 | if (rc != msg->len) |
| 786 | LOGP(DNAT, LOGL_ERROR, "Failed to write message to the BSC.\n"); |
| 787 | |
| 788 | return rc; |
| 789 | } |
| 790 | |
Holger Hans Peter Freyther | 49d8068 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 791 | static int ipaccess_listen_bsc_cb(struct bsc_fd *bfd, unsigned int what) |
| 792 | { |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 793 | struct bsc_connection *bsc; |
Holger Hans Peter Freyther | 872d768 | 2010-05-05 20:33:34 +0800 | [diff] [blame] | 794 | int fd, rc, on; |
Holger Hans Peter Freyther | 49d8068 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 795 | struct sockaddr_in sa; |
| 796 | socklen_t sa_len = sizeof(sa); |
| 797 | |
| 798 | if (!(what & BSC_FD_READ)) |
| 799 | return 0; |
| 800 | |
Holger Hans Peter Freyther | 872d768 | 2010-05-05 20:33:34 +0800 | [diff] [blame] | 801 | fd = accept(bfd->fd, (struct sockaddr *) &sa, &sa_len); |
| 802 | if (fd < 0) { |
Holger Hans Peter Freyther | 49d8068 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 803 | perror("accept"); |
Holger Hans Peter Freyther | 872d768 | 2010-05-05 20:33:34 +0800 | [diff] [blame] | 804 | return fd; |
Holger Hans Peter Freyther | 49d8068 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 805 | } |
| 806 | |
Holger Hans Peter Freyther | d470286 | 2010-04-12 12:17:09 +0200 | [diff] [blame] | 807 | /* count the reconnect */ |
| 808 | counter_inc(nat->stats.bsc.reconn); |
| 809 | |
Holger Hans Peter Freyther | cd89537 | 2010-03-29 08:04:09 +0200 | [diff] [blame] | 810 | /* |
| 811 | * if we are not connected to a msc... just close the socket |
| 812 | */ |
Holger Hans Peter Freyther | aad82ce | 2010-05-11 19:07:39 +0800 | [diff] [blame] | 813 | if (!nat->msc_con->is_connected) { |
Holger Hans Peter Freyther | cd89537 | 2010-03-29 08:04:09 +0200 | [diff] [blame] | 814 | LOGP(DNAT, LOGL_NOTICE, "Disconnecting BSC due lack of MSC connection.\n"); |
Holger Hans Peter Freyther | 872d768 | 2010-05-05 20:33:34 +0800 | [diff] [blame] | 815 | close(fd); |
Holger Hans Peter Freyther | cd89537 | 2010-03-29 08:04:09 +0200 | [diff] [blame] | 816 | return 0; |
| 817 | } |
| 818 | |
Holger Hans Peter Freyther | 9e938c6 | 2010-05-05 18:58:13 +0800 | [diff] [blame] | 819 | on = 1; |
Holger Hans Peter Freyther | 569ee12 | 2010-05-05 20:42:14 +0800 | [diff] [blame] | 820 | rc = setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)); |
Holger Hans Peter Freyther | 872d768 | 2010-05-05 20:33:34 +0800 | [diff] [blame] | 821 | if (rc != 0) |
Holger Hans Peter Freyther | 9e938c6 | 2010-05-05 18:58:13 +0800 | [diff] [blame] | 822 | LOGP(DNAT, LOGL_ERROR, "Failed to set TCP_NODELAY: %s\n", strerror(errno)); |
| 823 | |
Holger Hans Peter Freyther | 49d8068 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 824 | /* todo... do something with the connection */ |
Holger Hans Peter Freyther | da86c0a | 2010-01-12 21:35:32 +0100 | [diff] [blame] | 825 | /* todo... use GNUtls to see if we want to trust this as a BTS */ |
Holger Hans Peter Freyther | 49d8068 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 826 | |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 827 | /* |
| 828 | * |
| 829 | */ |
Holger Hans Peter Freyther | dcf8a7d | 2010-06-15 18:48:01 +0800 | [diff] [blame] | 830 | bsc = bsc_connection_alloc(nat); |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 831 | if (!bsc) { |
Holger Hans Peter Freyther | 418f394 | 2010-01-29 05:58:43 +0100 | [diff] [blame] | 832 | LOGP(DNAT, LOGL_ERROR, "Failed to allocate BSC struct.\n"); |
Holger Hans Peter Freyther | 872d768 | 2010-05-05 20:33:34 +0800 | [diff] [blame] | 833 | close(fd); |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 834 | return -1; |
| 835 | } |
| 836 | |
Holger Hans Peter Freyther | ed07a3f | 2010-06-15 18:47:10 +0800 | [diff] [blame] | 837 | bsc->write_queue.bfd.data = bsc; |
Holger Hans Peter Freyther | 872d768 | 2010-05-05 20:33:34 +0800 | [diff] [blame] | 838 | bsc->write_queue.bfd.fd = fd; |
Holger Hans Peter Freyther | ed07a3f | 2010-06-15 18:47:10 +0800 | [diff] [blame] | 839 | bsc->write_queue.read_cb = ipaccess_bsc_read_cb; |
Holger Hans Peter Freyther | 3025e19 | 2010-03-26 09:18:02 +0100 | [diff] [blame] | 840 | bsc->write_queue.write_cb = ipaccess_bsc_write_cb; |
Holger Hans Peter Freyther | ed07a3f | 2010-06-15 18:47:10 +0800 | [diff] [blame] | 841 | bsc->write_queue.bfd.when = BSC_FD_READ; |
| 842 | if (bsc_register_fd(&bsc->write_queue.bfd) < 0) { |
Holger Hans Peter Freyther | 418f394 | 2010-01-29 05:58:43 +0100 | [diff] [blame] | 843 | LOGP(DNAT, LOGL_ERROR, "Failed to register BSC fd.\n"); |
Holger Hans Peter Freyther | 872d768 | 2010-05-05 20:33:34 +0800 | [diff] [blame] | 844 | close(fd); |
Holger Hans Peter Freyther | 24614ad | 2010-01-13 09:28:12 +0100 | [diff] [blame] | 845 | talloc_free(bsc); |
| 846 | return -2; |
| 847 | } |
| 848 | |
Holger Hans Peter Freyther | 74cfab7 | 2010-05-05 17:03:44 +0800 | [diff] [blame] | 849 | LOGP(DNAT, LOGL_NOTICE, "BSC connection on %d with IP: %s\n", |
Holger Hans Peter Freyther | 872d768 | 2010-05-05 20:33:34 +0800 | [diff] [blame] | 850 | fd, inet_ntoa(sa.sin_addr)); |
Holger Hans Peter Freyther | 9a85ef3 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 851 | llist_add(&bsc->list_entry, &nat->bsc_connections); |
Holger Hans Peter Freyther | db7ba7d | 2010-03-26 07:41:54 +0100 | [diff] [blame] | 852 | send_id_ack(bsc); |
| 853 | send_id_req(bsc); |
Holger Hans Peter Freyther | d131b79 | 2010-03-31 07:30:58 +0200 | [diff] [blame] | 854 | send_mgcp_reset(bsc); |
Holger Hans Peter Freyther | aa69824 | 2010-06-15 18:46:19 +0800 | [diff] [blame] | 855 | |
| 856 | /* |
| 857 | * start the hangup timer |
| 858 | */ |
| 859 | bsc->id_timeout.data = bsc; |
| 860 | bsc->id_timeout.cb = ipaccess_close_bsc; |
Holger Hans Peter Freyther | da35a8d | 2010-05-05 16:57:38 +0800 | [diff] [blame] | 861 | bsc_schedule_timer(&bsc->id_timeout, nat->auth_timeout, 0); |
Holger Hans Peter Freyther | 49d8068 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 862 | return 0; |
| 863 | } |
| 864 | |
| 865 | static int listen_for_bsc(struct bsc_fd *bfd, struct in_addr *in_addr, int port) |
| 866 | { |
| 867 | struct sockaddr_in addr; |
| 868 | int ret, on = 1; |
| 869 | |
| 870 | bfd->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); |
| 871 | bfd->cb = ipaccess_listen_bsc_cb; |
| 872 | bfd->when = BSC_FD_READ; |
| 873 | |
| 874 | memset(&addr, 0, sizeof(addr)); |
| 875 | addr.sin_family = AF_INET; |
| 876 | addr.sin_port = htons(port); |
| 877 | addr.sin_addr.s_addr = in_addr->s_addr; |
| 878 | |
| 879 | setsockopt(bfd->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); |
| 880 | |
| 881 | ret = bind(bfd->fd, (struct sockaddr *) &addr, sizeof(addr)); |
| 882 | if (ret < 0) { |
| 883 | fprintf(stderr, "Could not bind the BSC socket %s\n", |
| 884 | strerror(errno)); |
| 885 | return -EIO; |
| 886 | } |
| 887 | |
| 888 | ret = listen(bfd->fd, 1); |
| 889 | if (ret < 0) { |
| 890 | perror("listen"); |
| 891 | return ret; |
| 892 | } |
| 893 | |
| 894 | ret = bsc_register_fd(bfd); |
| 895 | if (ret < 0) { |
| 896 | perror("register_listen_fd"); |
| 897 | return ret; |
| 898 | } |
| 899 | return 0; |
| 900 | } |
| 901 | |
Holger Hans Peter Freyther | 9e2c5f5 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 902 | static void print_usage() |
| 903 | { |
| 904 | printf("Usage: bsc_nat\n"); |
| 905 | } |
| 906 | |
| 907 | static void print_help() |
| 908 | { |
| 909 | printf(" Some useful help...\n"); |
| 910 | printf(" -h --help this text\n"); |
| 911 | printf(" -d option --debug=DRLL:DCC:DMM:DRR:DRSL:DNM enable debugging\n"); |
| 912 | printf(" -s --disable-color\n"); |
| 913 | printf(" -c --config-file filename The config file to use.\n"); |
| 914 | printf(" -m --msc=IP. The address of the MSC.\n"); |
Holger Hans Peter Freyther | 49d8068 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 915 | printf(" -l --local=IP. The local address of this BSC.\n"); |
Holger Hans Peter Freyther | 9e2c5f5 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 916 | } |
| 917 | |
| 918 | static void handle_options(int argc, char** argv) |
| 919 | { |
| 920 | while (1) { |
| 921 | int option_index = 0, c; |
| 922 | static struct option long_options[] = { |
| 923 | {"help", 0, 0, 'h'}, |
| 924 | {"debug", 1, 0, 'd'}, |
| 925 | {"config-file", 1, 0, 'c'}, |
| 926 | {"disable-color", 0, 0, 's'}, |
| 927 | {"timestamp", 0, 0, 'T'}, |
| 928 | {"msc", 1, 0, 'm'}, |
| 929 | {"local", 1, 0, 'l'}, |
| 930 | {0, 0, 0, 0} |
| 931 | }; |
| 932 | |
| 933 | c = getopt_long(argc, argv, "hd:sTPc:m:l:", |
| 934 | long_options, &option_index); |
| 935 | if (c == -1) |
| 936 | break; |
| 937 | |
| 938 | switch (c) { |
| 939 | case 'h': |
| 940 | print_usage(); |
| 941 | print_help(); |
| 942 | exit(0); |
| 943 | case 's': |
Holger Hans Peter Freyther | fb7a934 | 2010-06-15 19:14:12 +0800 | [diff] [blame] | 944 | log_set_use_color(stderr_target, 0); |
Holger Hans Peter Freyther | 9e2c5f5 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 945 | break; |
| 946 | case 'd': |
Holger Hans Peter Freyther | fb7a934 | 2010-06-15 19:14:12 +0800 | [diff] [blame] | 947 | log_parse_category_mask(stderr_target, optarg); |
Holger Hans Peter Freyther | 9e2c5f5 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 948 | break; |
| 949 | case 'c': |
| 950 | config_file = strdup(optarg); |
| 951 | break; |
| 952 | case 'T': |
Holger Hans Peter Freyther | fb7a934 | 2010-06-15 19:14:12 +0800 | [diff] [blame] | 953 | log_set_print_timestamp(stderr_target, 1); |
Holger Hans Peter Freyther | 9e2c5f5 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 954 | break; |
| 955 | case 'm': |
Holger Hans Peter Freyther | a88742c | 2010-06-15 18:51:04 +0800 | [diff] [blame] | 956 | msc_ip = optarg; |
Holger Hans Peter Freyther | 9e2c5f5 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 957 | break; |
| 958 | case 'l': |
| 959 | inet_aton(optarg, &local_addr); |
| 960 | break; |
| 961 | default: |
| 962 | /* ignore */ |
| 963 | break; |
| 964 | } |
| 965 | } |
| 966 | } |
| 967 | |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 968 | static void signal_handler(int signal) |
| 969 | { |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 970 | switch (signal) { |
| 971 | case SIGABRT: |
| 972 | /* in case of abort, we want to obtain a talloc report |
| 973 | * and then return to the caller, who will abort the process */ |
| 974 | case SIGUSR1: |
| 975 | talloc_report_full(tall_bsc_ctx, stderr); |
| 976 | break; |
| 977 | default: |
| 978 | break; |
| 979 | } |
| 980 | } |
| 981 | |
Holger Hans Peter Freyther | 6b6ecba | 2010-06-15 18:51:56 +0800 | [diff] [blame] | 982 | static void sccp_close_unconfirmed(void *_data) |
| 983 | { |
| 984 | struct sccp_connections *conn, *tmp1; |
| 985 | struct timespec now; |
| 986 | clock_gettime(CLOCK_MONOTONIC, &now); |
| 987 | |
| 988 | llist_for_each_entry_safe(conn, tmp1, &nat->sccp_connections, list_entry) { |
| 989 | if (conn->has_remote_ref) |
| 990 | continue; |
| 991 | |
| 992 | int diff = (now.tv_sec - conn->creation_time.tv_sec) / 60; |
| 993 | if (diff < SCCP_CLOSE_TIME_TIMEOUT) |
| 994 | continue; |
| 995 | |
| 996 | LOGP(DNAT, LOGL_ERROR, "SCCP connection 0x%x/0x%x was never confirmed.\n", |
| 997 | sccp_src_ref_to_int(&conn->real_ref), |
| 998 | sccp_src_ref_to_int(&conn->patched_ref)); |
| 999 | sccp_connection_destroy(conn); |
| 1000 | } |
| 1001 | |
| 1002 | bsc_schedule_timer(&sccp_close, SCCP_CLOSE_TIME, 0); |
| 1003 | } |
| 1004 | |
Holger Hans Peter Freyther | 0b0b31c | 2010-06-15 18:51:25 +0800 | [diff] [blame] | 1005 | extern void *tall_msgb_ctx; |
| 1006 | extern void *tall_ctr_ctx; |
| 1007 | static void talloc_init_ctx() |
| 1008 | { |
| 1009 | tall_bsc_ctx = talloc_named_const(NULL, 0, "nat"); |
| 1010 | tall_msgb_ctx = talloc_named_const(tall_bsc_ctx, 0, "msgb"); |
| 1011 | tall_ctr_ctx = talloc_named_const(tall_bsc_ctx, 0, "counter"); |
| 1012 | } |
| 1013 | |
Holger Hans Peter Freyther | 9e2c5f5 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 1014 | int main(int argc, char** argv) |
| 1015 | { |
Holger Hans Peter Freyther | 0b0b31c | 2010-06-15 18:51:25 +0800 | [diff] [blame] | 1016 | talloc_init_ctx(); |
| 1017 | |
Holger Hans Peter Freyther | a1597f1 | 2010-06-15 18:51:18 +0800 | [diff] [blame] | 1018 | |
Holger Hans Peter Freyther | fb7a934 | 2010-06-15 19:14:12 +0800 | [diff] [blame] | 1019 | log_init(&log_info); |
| 1020 | stderr_target = log_target_create_stderr(); |
| 1021 | log_add_target(stderr_target); |
| 1022 | log_set_all_filter(stderr_target, 1); |
Holger Hans Peter Freyther | 6c45f2e | 2010-06-15 19:06:18 +0800 | [diff] [blame] | 1023 | |
Holger Hans Peter Freyther | 9a85ef3 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 1024 | nat = bsc_nat_alloc(); |
| 1025 | if (!nat) { |
| 1026 | fprintf(stderr, "Failed to allocate the BSC nat.\n"); |
| 1027 | return -4; |
| 1028 | } |
| 1029 | |
Holger Hans Peter Freyther | f7d3335 | 2010-06-15 18:50:26 +0800 | [diff] [blame] | 1030 | nat->mgcp_cfg = talloc_zero(nat, struct mgcp_config); |
Holger Hans Peter Freyther | a88742c | 2010-06-15 18:51:04 +0800 | [diff] [blame] | 1031 | if (!nat->mgcp_cfg) { |
| 1032 | fprintf(stderr, "Failed to allocate MGCP cfg.\n"); |
| 1033 | return -5; |
| 1034 | } |
| 1035 | |
| 1036 | /* parse options */ |
| 1037 | local_addr.s_addr = INADDR_ANY; |
| 1038 | handle_options(argc, argv); |
Holger Hans Peter Freyther | f7d3335 | 2010-06-15 18:50:26 +0800 | [diff] [blame] | 1039 | |
Holger Hans Peter Freyther | 9a85ef3 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 1040 | /* init vty and parse */ |
| 1041 | bsc_nat_vty_init(nat); |
| 1042 | telnet_init(NULL, 4244); |
Holger Hans Peter Freyther | f7d3335 | 2010-06-15 18:50:26 +0800 | [diff] [blame] | 1043 | if (mgcp_parse_config(config_file, nat->mgcp_cfg) < 0) { |
Holger Hans Peter Freyther | 9a85ef3 | 2010-06-15 18:46:11 +0800 | [diff] [blame] | 1044 | fprintf(stderr, "Failed to parse the config file: '%s'\n", config_file); |
| 1045 | return -3; |
| 1046 | } |
| 1047 | |
Holger Hans Peter Freyther | a88742c | 2010-06-15 18:51:04 +0800 | [diff] [blame] | 1048 | /* over rule the VTY config */ |
| 1049 | if (msc_ip) |
| 1050 | bsc_nat_set_msc_ip(nat, msc_ip); |
| 1051 | |
Holger Hans Peter Freyther | 9e2c5f5 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 1052 | /* seed the PRNG */ |
| 1053 | srand(time(NULL)); |
| 1054 | |
Holger Hans Peter Freyther | a7f8018 | 2010-03-31 13:02:22 +0200 | [diff] [blame] | 1055 | /* |
| 1056 | * Setup the MGCP code.. |
| 1057 | */ |
Holger Hans Peter Freyther | 7b7eef6 | 2010-04-22 12:08:17 +0800 | [diff] [blame] | 1058 | if (bsc_mgcp_nat_init(nat) != 0) |
Holger Hans Peter Freyther | a7f8018 | 2010-03-31 13:02:22 +0200 | [diff] [blame] | 1059 | return -4; |
| 1060 | |
Holger Hans Peter Freyther | 49d8068 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 1061 | /* connect to the MSC */ |
Holger Hans Peter Freyther | aad82ce | 2010-05-11 19:07:39 +0800 | [diff] [blame] | 1062 | nat->msc_con = bsc_msc_create(nat->msc_ip, nat->msc_port); |
| 1063 | if (!nat->msc_con) { |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 1064 | fprintf(stderr, "Creating a bsc_msc_connection failed.\n"); |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 1065 | exit(1); |
| 1066 | } |
| 1067 | |
Holger Hans Peter Freyther | aad82ce | 2010-05-11 19:07:39 +0800 | [diff] [blame] | 1068 | nat->msc_con->connection_loss = msc_connection_was_lost; |
| 1069 | nat->msc_con->write_queue.read_cb = ipaccess_msc_read_cb; |
| 1070 | nat->msc_con->write_queue.write_cb = ipaccess_msc_write_cb;; |
| 1071 | bsc_msc_connect(nat->msc_con); |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 1072 | |
Holger Hans Peter Freyther | 49d8068 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 1073 | /* wait for the BSC */ |
Holger Hans Peter Freyther | 2d677c6 | 2010-03-26 06:51:04 +0100 | [diff] [blame] | 1074 | if (listen_for_bsc(&bsc_listen, &local_addr, 5000) < 0) { |
Holger Hans Peter Freyther | 49d8068 | 2010-01-12 21:34:54 +0100 | [diff] [blame] | 1075 | fprintf(stderr, "Failed to listen for BSC.\n"); |
| 1076 | exit(1); |
| 1077 | } |
| 1078 | |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 1079 | signal(SIGABRT, &signal_handler); |
| 1080 | signal(SIGUSR1, &signal_handler); |
| 1081 | signal(SIGPIPE, SIG_IGN); |
| 1082 | |
Holger Hans Peter Freyther | 6b6ecba | 2010-06-15 18:51:56 +0800 | [diff] [blame] | 1083 | /* recycle timer */ |
| 1084 | sccp_close.cb = sccp_close_unconfirmed; |
| 1085 | sccp_close.data = NULL; |
| 1086 | bsc_schedule_timer(&sccp_close, SCCP_CLOSE_TIME, 0); |
| 1087 | |
Holger Hans Peter Freyther | 6ace522 | 2010-01-12 21:15:08 +0100 | [diff] [blame] | 1088 | while (1) { |
| 1089 | bsc_select_main(0); |
| 1090 | } |
| 1091 | |
Holger Hans Peter Freyther | 9e2c5f5 | 2010-06-15 18:44:42 +0800 | [diff] [blame] | 1092 | return 0; |
| 1093 | } |