Holger Hans Peter Freyther | 465313e | 2010-06-15 18:49:53 +0800 | [diff] [blame] | 1 | /* |
| 2 | * (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org> |
| 3 | * (C) 2010 by On-Waves |
| 4 | * All Rights Reserved |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License along |
| 17 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 19 | * |
| 20 | */ |
| 21 | |
| 22 | #include <openbsc/bsc_nat.h> |
| 23 | #include <openbsc/gsm_data.h> |
Holger Hans Peter Freyther | 465313e | 2010-06-15 18:49:53 +0800 | [diff] [blame] | 24 | #include <openbsc/debug.h> |
Holger Hans Peter Freyther | 241e130 | 2010-03-31 09:16:56 +0200 | [diff] [blame] | 25 | #include <openbsc/mgcp.h> |
| 26 | #include <openbsc/mgcp_internal.h> |
Holger Hans Peter Freyther | 465313e | 2010-06-15 18:49:53 +0800 | [diff] [blame] | 27 | |
Holger Hans Peter Freyther | 7b7eef6 | 2010-04-22 12:08:17 +0800 | [diff] [blame] | 28 | #include <sccp/sccp.h> |
| 29 | |
Holger Hans Peter Freyther | a0df82d | 2010-04-01 08:21:33 +0200 | [diff] [blame] | 30 | #include <osmocore/talloc.h> |
Holger Hans Peter Freyther | 1395948 | 2010-06-15 18:50:57 +0800 | [diff] [blame] | 31 | #include <osmocore/gsm0808.h> |
Holger Hans Peter Freyther | 69d801e | 2010-06-15 20:13:33 +0800 | [diff] [blame] | 32 | #include <osmocore/protocol/gsm_08_08.h> |
Holger Hans Peter Freyther | a0df82d | 2010-04-01 08:21:33 +0200 | [diff] [blame] | 33 | |
Holger Hans Peter Freyther | 465313e | 2010-06-15 18:49:53 +0800 | [diff] [blame] | 34 | #include <netinet/in.h> |
| 35 | #include <arpa/inet.h> |
| 36 | |
Holger Hans Peter Freyther | a7f8018 | 2010-03-31 13:02:22 +0200 | [diff] [blame] | 37 | #include <errno.h> |
| 38 | #include <unistd.h> |
| 39 | |
Holger Hans Peter Freyther | 465313e | 2010-06-15 18:49:53 +0800 | [diff] [blame] | 40 | int bsc_mgcp_assign(struct sccp_connections *con, struct msgb *msg) |
| 41 | { |
Holger Hans Peter Freyther | 7b7eef6 | 2010-04-22 12:08:17 +0800 | [diff] [blame] | 42 | struct sccp_connections *mcon; |
Holger Hans Peter Freyther | 465313e | 2010-06-15 18:49:53 +0800 | [diff] [blame] | 43 | struct tlv_parsed tp; |
| 44 | u_int16_t cic; |
| 45 | u_int8_t timeslot; |
| 46 | u_int8_t multiplex; |
Holger Hans Peter Freyther | 7b7eef6 | 2010-04-22 12:08:17 +0800 | [diff] [blame] | 47 | int combined; |
Holger Hans Peter Freyther | 465313e | 2010-06-15 18:49:53 +0800 | [diff] [blame] | 48 | |
| 49 | if (!msg->l3h) { |
| 50 | LOGP(DNAT, LOGL_ERROR, "Assignment message should have l3h pointer.\n"); |
| 51 | return -1; |
| 52 | } |
| 53 | |
| 54 | if (msgb_l3len(msg) < 3) { |
| 55 | LOGP(DNAT, LOGL_ERROR, "Assignment message has not enough space for GSM0808.\n"); |
| 56 | return -1; |
| 57 | } |
| 58 | |
| 59 | tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l3h + 3, msgb_l3len(msg) - 3, 0, 0); |
| 60 | if (!TLVP_PRESENT(&tp, GSM0808_IE_CIRCUIT_IDENTITY_CODE)) { |
| 61 | LOGP(DNAT, LOGL_ERROR, "Circuit identity code not found in assignment message.\n"); |
| 62 | return -1; |
| 63 | } |
| 64 | |
| 65 | cic = ntohs(*(u_int16_t *)TLVP_VAL(&tp, GSM0808_IE_CIRCUIT_IDENTITY_CODE)); |
| 66 | timeslot = cic & 0x1f; |
| 67 | multiplex = (cic & ~0x1f) >> 5; |
| 68 | |
Holger Hans Peter Freyther | 7b7eef6 | 2010-04-22 12:08:17 +0800 | [diff] [blame] | 69 | |
| 70 | combined = (32 * multiplex) + timeslot; |
| 71 | |
| 72 | /* find stale connections using that endpoint */ |
| 73 | llist_for_each_entry(mcon, &con->bsc->nat->sccp_connections, list_entry) { |
| 74 | if (mcon->msc_timeslot == combined) { |
| 75 | LOGP(DNAT, LOGL_ERROR, |
| 76 | "Timeslot %d was assigned to 0x%x and now 0x%x\n", |
| 77 | combined, |
| 78 | sccp_src_ref_to_int(&mcon->patched_ref), |
| 79 | sccp_src_ref_to_int(&con->patched_ref)); |
| 80 | bsc_mgcp_dlcx(mcon); |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | con->msc_timeslot = combined; |
Holger Hans Peter Freyther | 465313e | 2010-06-15 18:49:53 +0800 | [diff] [blame] | 85 | con->bsc_timeslot = con->msc_timeslot; |
| 86 | return 0; |
| 87 | } |
| 88 | |
Holger Hans Peter Freyther | 7b7eef6 | 2010-04-22 12:08:17 +0800 | [diff] [blame] | 89 | static void bsc_mgcp_free_endpoint(struct bsc_nat *nat, int i) |
Holger Hans Peter Freyther | a0df82d | 2010-04-01 08:21:33 +0200 | [diff] [blame] | 90 | { |
| 91 | if (nat->bsc_endpoints[i].transaction_id) { |
| 92 | talloc_free(nat->bsc_endpoints[i].transaction_id); |
| 93 | nat->bsc_endpoints[i].transaction_id = NULL; |
| 94 | } |
| 95 | |
| 96 | nat->bsc_endpoints[i].bsc = NULL; |
Holger Hans Peter Freyther | a0df82d | 2010-04-01 08:21:33 +0200 | [diff] [blame] | 97 | } |
| 98 | |
Holger Hans Peter Freyther | 241e130 | 2010-03-31 09:16:56 +0200 | [diff] [blame] | 99 | void bsc_mgcp_free_endpoints(struct bsc_nat *nat) |
| 100 | { |
| 101 | int i; |
| 102 | |
Holger Hans Peter Freyther | 7b7eef6 | 2010-04-22 12:08:17 +0800 | [diff] [blame] | 103 | for (i = 1; i < nat->mgcp_cfg->number_endpoints; ++i){ |
Holger Hans Peter Freyther | a0df82d | 2010-04-01 08:21:33 +0200 | [diff] [blame] | 104 | bsc_mgcp_free_endpoint(nat, i); |
Holger Hans Peter Freyther | 7b7eef6 | 2010-04-22 12:08:17 +0800 | [diff] [blame] | 105 | mgcp_free_endp(&nat->mgcp_cfg->endpoints[i]); |
| 106 | } |
Holger Hans Peter Freyther | 241e130 | 2010-03-31 09:16:56 +0200 | [diff] [blame] | 107 | } |
Holger Hans Peter Freyther | a7f8018 | 2010-03-31 13:02:22 +0200 | [diff] [blame] | 108 | |
Holger Hans Peter Freyther | 7b7eef6 | 2010-04-22 12:08:17 +0800 | [diff] [blame] | 109 | /* send a MDCX where we do not want a response */ |
| 110 | static void bsc_mgcp_send_mdcx(struct bsc_connection *bsc, struct mgcp_endpoint *endp) |
| 111 | { |
| 112 | char buf[2096]; |
| 113 | int len; |
| 114 | |
| 115 | len = snprintf(buf, sizeof(buf), |
Holger Hans Peter Freyther | f42f45b | 2010-04-22 13:06:24 +0800 | [diff] [blame] | 116 | "MDCX 23 %x@mgw MGCP 1.0\r\n" |
Holger Hans Peter Freyther | 7b7eef6 | 2010-04-22 12:08:17 +0800 | [diff] [blame] | 117 | "Z: noanswer\r\n" |
| 118 | "\r\n" |
| 119 | "c=IN IP4 %s\r\n" |
| 120 | "m=audio %d RTP/AVP 255\r\n", |
| 121 | ENDPOINT_NUMBER(endp), |
| 122 | bsc->nat->mgcp_cfg->source_addr, |
| 123 | endp->rtp_port); |
| 124 | if (len < 0) { |
| 125 | LOGP(DMGCP, LOGL_ERROR, "snprintf for DLCX failed.\n"); |
| 126 | return; |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | static void bsc_mgcp_send_dlcx(struct bsc_connection *bsc, int endpoint) |
| 131 | { |
| 132 | char buf[2096]; |
| 133 | int len; |
| 134 | |
| 135 | len = snprintf(buf, sizeof(buf), |
Holger Hans Peter Freyther | f42f45b | 2010-04-22 13:06:24 +0800 | [diff] [blame] | 136 | "DLCX 23 %x@mgw MGCP 1.0\r\n" |
Holger Hans Peter Freyther | 7b7eef6 | 2010-04-22 12:08:17 +0800 | [diff] [blame] | 137 | "Z: noanswer\r\n", endpoint); |
| 138 | if (len < 0) { |
| 139 | LOGP(DMGCP, LOGL_ERROR, "snprintf for DLCX failed.\n"); |
| 140 | return; |
| 141 | } |
| 142 | |
| 143 | bsc_write_mgcp(bsc, (u_int8_t *) buf, len); |
| 144 | } |
| 145 | |
| 146 | void bsc_mgcp_init(struct sccp_connections *con) |
| 147 | { |
| 148 | con->msc_timeslot = -1; |
| 149 | con->bsc_timeslot = -1; |
Holger Hans Peter Freyther | 959bbcf | 2010-04-22 20:12:13 +0800 | [diff] [blame] | 150 | con->crcx = 0; |
Holger Hans Peter Freyther | 7b7eef6 | 2010-04-22 12:08:17 +0800 | [diff] [blame] | 151 | } |
| 152 | |
| 153 | void bsc_mgcp_dlcx(struct sccp_connections *con) |
| 154 | { |
| 155 | /* send a DLCX down the stream */ |
Holger Hans Peter Freyther | 959bbcf | 2010-04-22 20:12:13 +0800 | [diff] [blame] | 156 | if (con->bsc_timeslot != -1 && con->crcx) { |
Holger Hans Peter Freyther | 7b7eef6 | 2010-04-22 12:08:17 +0800 | [diff] [blame] | 157 | int endp = mgcp_timeslot_to_endpoint(0, con->msc_timeslot); |
| 158 | bsc_mgcp_send_dlcx(con->bsc, endp); |
| 159 | bsc_mgcp_free_endpoint(con->bsc->nat, endp); |
| 160 | } |
| 161 | |
| 162 | bsc_mgcp_init(con); |
| 163 | } |
| 164 | |
| 165 | |
Holger Hans Peter Freyther | 08a1b16 | 2010-04-18 02:26:16 +0800 | [diff] [blame] | 166 | struct sccp_connections *bsc_mgcp_find_con(struct bsc_nat *nat, int endpoint) |
Holger Hans Peter Freyther | fc9bd23 | 2010-04-01 03:55:27 +0200 | [diff] [blame] | 167 | { |
Holger Hans Peter Freyther | 08a1b16 | 2010-04-18 02:26:16 +0800 | [diff] [blame] | 168 | struct sccp_connections *con = NULL; |
Holger Hans Peter Freyther | fc9bd23 | 2010-04-01 03:55:27 +0200 | [diff] [blame] | 169 | struct sccp_connections *sccp; |
| 170 | |
| 171 | llist_for_each_entry(sccp, &nat->sccp_connections, list_entry) { |
| 172 | if (sccp->msc_timeslot == -1) |
| 173 | continue; |
| 174 | if (mgcp_timeslot_to_endpoint(0, sccp->msc_timeslot) != endpoint) |
| 175 | continue; |
| 176 | |
Holger Hans Peter Freyther | 08a1b16 | 2010-04-18 02:26:16 +0800 | [diff] [blame] | 177 | con = sccp; |
Holger Hans Peter Freyther | fc9bd23 | 2010-04-01 03:55:27 +0200 | [diff] [blame] | 178 | } |
| 179 | |
Holger Hans Peter Freyther | 08a1b16 | 2010-04-18 02:26:16 +0800 | [diff] [blame] | 180 | if (con) |
| 181 | return con; |
Holger Hans Peter Freyther | eb52e89 | 2010-04-18 02:14:45 +0800 | [diff] [blame] | 182 | |
Holger Hans Peter Freyther | fc9bd23 | 2010-04-01 03:55:27 +0200 | [diff] [blame] | 183 | LOGP(DMGCP, LOGL_ERROR, "Failed to find the connection.\n"); |
| 184 | return NULL; |
| 185 | } |
| 186 | |
Holger Hans Peter Freyther | a0df82d | 2010-04-01 08:21:33 +0200 | [diff] [blame] | 187 | int bsc_mgcp_policy_cb(struct mgcp_config *cfg, int endpoint, int state, const char *transaction_id) |
| 188 | { |
| 189 | struct bsc_nat *nat; |
| 190 | struct bsc_endpoint *bsc_endp; |
Holger Hans Peter Freyther | 08a1b16 | 2010-04-18 02:26:16 +0800 | [diff] [blame] | 191 | struct sccp_connections *sccp; |
Holger Hans Peter Freyther | a0df82d | 2010-04-01 08:21:33 +0200 | [diff] [blame] | 192 | struct mgcp_endpoint *mgcp_endp; |
| 193 | struct msgb *bsc_msg; |
| 194 | |
| 195 | nat = cfg->data; |
| 196 | bsc_endp = &nat->bsc_endpoints[endpoint]; |
| 197 | mgcp_endp = &nat->mgcp_cfg->endpoints[endpoint]; |
| 198 | |
Holger Hans Peter Freyther | fef7612 | 2010-04-24 21:05:18 +0800 | [diff] [blame] | 199 | if (bsc_endp->transaction_id) { |
| 200 | LOGP(DMGCP, LOGL_ERROR, "Endpoint 0x%x had pending transaction: '%s'\n", |
| 201 | endpoint, bsc_endp->transaction_id); |
| 202 | talloc_free(bsc_endp->transaction_id); |
| 203 | bsc_endp->transaction_id = NULL; |
| 204 | } |
| 205 | bsc_endp->bsc = NULL; |
| 206 | |
Holger Hans Peter Freyther | 08a1b16 | 2010-04-18 02:26:16 +0800 | [diff] [blame] | 207 | sccp = bsc_mgcp_find_con(nat, endpoint); |
Holger Hans Peter Freyther | a0df82d | 2010-04-01 08:21:33 +0200 | [diff] [blame] | 208 | |
Holger Hans Peter Freyther | 08a1b16 | 2010-04-18 02:26:16 +0800 | [diff] [blame] | 209 | if (!sccp) { |
Holger Hans Peter Freyther | 3d194d9 | 2010-04-24 21:02:01 +0800 | [diff] [blame] | 210 | LOGP(DMGCP, LOGL_ERROR, "Did not find BSC for change on endpoint: 0x%x state: %d\n", endpoint, state); |
Holger Hans Peter Freyther | a0df82d | 2010-04-01 08:21:33 +0200 | [diff] [blame] | 211 | |
| 212 | switch (state) { |
| 213 | case MGCP_ENDP_CRCX: |
| 214 | return MGCP_POLICY_REJECT; |
| 215 | break; |
| 216 | case MGCP_ENDP_DLCX: |
| 217 | return MGCP_POLICY_CONT; |
| 218 | break; |
| 219 | case MGCP_ENDP_MDCX: |
| 220 | return MGCP_POLICY_CONT; |
| 221 | break; |
| 222 | default: |
| 223 | LOGP(DMGCP, LOGL_FATAL, "Unhandled state: %d\n", state); |
| 224 | return MGCP_POLICY_CONT; |
| 225 | break; |
| 226 | } |
| 227 | } |
| 228 | |
Holger Hans Peter Freyther | dd16b42 | 2010-04-07 09:53:54 +0200 | [diff] [blame] | 229 | /* we need to generate a new and patched message */ |
| 230 | bsc_msg = bsc_mgcp_rewrite((char *) nat->mgcp_msg, nat->mgcp_length, |
| 231 | nat->mgcp_cfg->source_addr, mgcp_endp->rtp_port); |
| 232 | if (!bsc_msg) { |
| 233 | LOGP(DMGCP, LOGL_ERROR, "Failed to patch the msg.\n"); |
| 234 | return MGCP_POLICY_CONT; |
| 235 | } |
| 236 | |
| 237 | |
Holger Hans Peter Freyther | b3e0a03 | 2010-04-04 18:11:49 +0200 | [diff] [blame] | 238 | bsc_endp->transaction_id = talloc_strdup(nat, transaction_id); |
Holger Hans Peter Freyther | 08a1b16 | 2010-04-18 02:26:16 +0800 | [diff] [blame] | 239 | bsc_endp->bsc = sccp->bsc; |
Holger Hans Peter Freyther | a0df82d | 2010-04-01 08:21:33 +0200 | [diff] [blame] | 240 | |
| 241 | /* we need to update some bits */ |
| 242 | if (state == MGCP_ENDP_CRCX) { |
| 243 | struct sockaddr_in sock; |
| 244 | socklen_t len = sizeof(sock); |
Holger Hans Peter Freyther | 08a1b16 | 2010-04-18 02:26:16 +0800 | [diff] [blame] | 245 | if (getpeername(sccp->bsc->write_queue.bfd.fd, (struct sockaddr *) &sock, &len) != 0) { |
Holger Hans Peter Freyther | 92febd3 | 2010-04-06 11:17:07 +0200 | [diff] [blame] | 246 | LOGP(DMGCP, LOGL_ERROR, "Can not get the peername...%d/%s\n", |
| 247 | errno, strerror(errno)); |
Holger Hans Peter Freyther | a0df82d | 2010-04-01 08:21:33 +0200 | [diff] [blame] | 248 | } else { |
| 249 | mgcp_endp->bts = sock.sin_addr; |
| 250 | } |
Holger Hans Peter Freyther | a0df82d | 2010-04-01 08:21:33 +0200 | [diff] [blame] | 251 | |
Holger Hans Peter Freyther | 7b7eef6 | 2010-04-22 12:08:17 +0800 | [diff] [blame] | 252 | /* send the message and a fake MDCX for force sending of a dummy packet */ |
Holger Hans Peter Freyther | 959bbcf | 2010-04-22 20:12:13 +0800 | [diff] [blame] | 253 | sccp->crcx = 1; |
Holger Hans Peter Freyther | 7b7eef6 | 2010-04-22 12:08:17 +0800 | [diff] [blame] | 254 | bsc_write(sccp->bsc, bsc_msg, NAT_IPAC_PROTO_MGCP); |
| 255 | bsc_mgcp_send_mdcx(sccp->bsc, mgcp_endp); |
| 256 | return MGCP_POLICY_DEFER; |
| 257 | } else if (state == MGCP_ENDP_DLCX) { |
| 258 | /* we will free the endpoint now and send a DLCX to the BSC */ |
Holger Hans Peter Freyther | 3a347f0 | 2010-05-01 10:31:53 +0800 | [diff] [blame] | 259 | msgb_free(bsc_msg); |
Holger Hans Peter Freyther | 7b7eef6 | 2010-04-22 12:08:17 +0800 | [diff] [blame] | 260 | bsc_mgcp_dlcx(sccp); |
| 261 | return MGCP_POLICY_CONT; |
| 262 | } else { |
| 263 | bsc_write(sccp->bsc, bsc_msg, NAT_IPAC_PROTO_MGCP); |
| 264 | return MGCP_POLICY_DEFER; |
| 265 | } |
Holger Hans Peter Freyther | a0df82d | 2010-04-01 08:21:33 +0200 | [diff] [blame] | 266 | } |
| 267 | |
Holger Hans Peter Freyther | 3c3bce1 | 2010-04-01 10:16:28 +0200 | [diff] [blame] | 268 | /* |
| 269 | * We have received a msg from the BSC. We will see if we know |
| 270 | * this transaction and if it belongs to the BSC. Then we will |
| 271 | * need to patch the content to point to the local network and we |
| 272 | * need to update the I: that was assigned by the BSS. |
| 273 | */ |
| 274 | void bsc_mgcp_forward(struct bsc_connection *bsc, struct msgb *msg) |
| 275 | { |
| 276 | struct msgb *output; |
| 277 | struct bsc_endpoint *bsc_endp = NULL; |
| 278 | struct mgcp_endpoint *endp = NULL; |
Holger Hans Peter Freyther | d2dd6e8 | 2010-04-06 11:06:11 +0200 | [diff] [blame] | 279 | int i, code; |
Holger Hans Peter Freyther | 3c3bce1 | 2010-04-01 10:16:28 +0200 | [diff] [blame] | 280 | char transaction_id[60]; |
| 281 | |
| 282 | /* Some assumption that our buffer is big enough.. and null terminate */ |
| 283 | if (msgb_l2len(msg) > 2000) { |
| 284 | LOGP(DMGCP, LOGL_ERROR, "MGCP message too long.\n"); |
| 285 | return; |
| 286 | } |
| 287 | |
| 288 | msg->l2h[msgb_l2len(msg)] = '\0'; |
| 289 | |
| 290 | if (bsc_mgcp_parse_response((const char *) msg->l2h, &code, transaction_id) != 0) { |
| 291 | LOGP(DMGCP, LOGL_ERROR, "Failed to parse response code.\n"); |
| 292 | return; |
| 293 | } |
| 294 | |
| 295 | for (i = 1; i < bsc->nat->mgcp_cfg->number_endpoints; ++i) { |
| 296 | if (bsc->nat->bsc_endpoints[i].bsc != bsc) |
| 297 | continue; |
Holger Hans Peter Freyther | 3f7c7d0 | 2010-04-05 18:00:05 +0200 | [diff] [blame] | 298 | /* no one listening? a bug? */ |
| 299 | if (!bsc->nat->bsc_endpoints[i].transaction_id) |
| 300 | continue; |
Holger Hans Peter Freyther | 3c3bce1 | 2010-04-01 10:16:28 +0200 | [diff] [blame] | 301 | if (strcmp(transaction_id, bsc->nat->bsc_endpoints[i].transaction_id) != 0) |
| 302 | continue; |
| 303 | |
| 304 | endp = &bsc->nat->mgcp_cfg->endpoints[i]; |
| 305 | bsc_endp = &bsc->nat->bsc_endpoints[i]; |
| 306 | break; |
| 307 | } |
| 308 | |
| 309 | if (!bsc_endp) { |
Holger Hans Peter Freyther | b9ac37d | 2010-04-05 17:58:52 +0200 | [diff] [blame] | 310 | LOGP(DMGCP, LOGL_ERROR, "Could not find active endpoint: %s for msg: '%s'\n", |
| 311 | transaction_id, (const char *) msg->l2h); |
Holger Hans Peter Freyther | 3c3bce1 | 2010-04-01 10:16:28 +0200 | [diff] [blame] | 312 | return; |
| 313 | } |
| 314 | |
Holger Hans Peter Freyther | 7b7eef6 | 2010-04-22 12:08:17 +0800 | [diff] [blame] | 315 | endp->ci = bsc_mgcp_extract_ci((const char *) msg->l2h); |
Holger Hans Peter Freyther | dd16b42 | 2010-04-07 09:53:54 +0200 | [diff] [blame] | 316 | |
Holger Hans Peter Freyther | 3c3bce1 | 2010-04-01 10:16:28 +0200 | [diff] [blame] | 317 | /* free some stuff */ |
| 318 | talloc_free(bsc_endp->transaction_id); |
| 319 | bsc_endp->transaction_id = NULL; |
| 320 | |
Holger Hans Peter Freyther | dd16b42 | 2010-04-07 09:53:54 +0200 | [diff] [blame] | 321 | /* |
| 322 | * rewrite the information. In case the endpoint was deleted |
| 323 | * there should be nothing for us to rewrite so putting endp->rtp_port |
| 324 | * with the value of 0 should be no problem. |
| 325 | */ |
Holger Hans Peter Freyther | 8d20065 | 2010-04-04 18:09:10 +0200 | [diff] [blame] | 326 | output = bsc_mgcp_rewrite((char * ) msg->l2h, msgb_l2len(msg), |
| 327 | bsc->nat->mgcp_cfg->source_addr, endp->rtp_port); |
Holger Hans Peter Freyther | 5cc94fb | 2010-04-05 22:56:49 +0200 | [diff] [blame] | 328 | |
Holger Hans Peter Freyther | 3c3bce1 | 2010-04-01 10:16:28 +0200 | [diff] [blame] | 329 | if (!output) { |
| 330 | LOGP(DMGCP, LOGL_ERROR, "Failed to rewrite MGCP msg.\n"); |
| 331 | return; |
| 332 | } |
| 333 | |
| 334 | if (write_queue_enqueue(&bsc->nat->mgcp_queue, output) != 0) { |
| 335 | LOGP(DMGCP, LOGL_ERROR, "Failed to queue MGCP msg.\n"); |
| 336 | msgb_free(output); |
| 337 | } |
| 338 | } |
| 339 | |
| 340 | int bsc_mgcp_parse_response(const char *str, int *code, char transaction[60]) |
| 341 | { |
| 342 | /* we want to parse two strings */ |
| 343 | return sscanf(str, "%3d %59s\n", code, transaction) != 2; |
| 344 | } |
| 345 | |
| 346 | int bsc_mgcp_extract_ci(const char *str) |
| 347 | { |
| 348 | int ci; |
| 349 | char *res = strstr(str, "I: "); |
| 350 | if (!res) |
| 351 | return CI_UNUSED; |
| 352 | |
Holger Hans Peter Freyther | 806aca9 | 2010-04-05 09:07:39 +0200 | [diff] [blame] | 353 | if (sscanf(res, "I: %d", &ci) != 1) |
Holger Hans Peter Freyther | 3c3bce1 | 2010-04-01 10:16:28 +0200 | [diff] [blame] | 354 | return CI_UNUSED; |
| 355 | return ci; |
| 356 | } |
| 357 | |
Holger Hans Peter Freyther | 76c8354 | 2010-04-01 06:48:52 +0200 | [diff] [blame] | 358 | /* we need to replace some strings... */ |
Holger Hans Peter Freyther | 8d20065 | 2010-04-04 18:09:10 +0200 | [diff] [blame] | 359 | struct msgb *bsc_mgcp_rewrite(char *input, int length, const char *ip, int port) |
Holger Hans Peter Freyther | 76c8354 | 2010-04-01 06:48:52 +0200 | [diff] [blame] | 360 | { |
| 361 | static const char *ip_str = "c=IN IP4 "; |
| 362 | static const char *aud_str = "m=audio "; |
| 363 | |
| 364 | char buf[128]; |
| 365 | char *running, *token; |
| 366 | struct msgb *output; |
| 367 | |
Holger Hans Peter Freyther | 8d20065 | 2010-04-04 18:09:10 +0200 | [diff] [blame] | 368 | if (length > 4096 - 128) { |
Holger Hans Peter Freyther | 76c8354 | 2010-04-01 06:48:52 +0200 | [diff] [blame] | 369 | LOGP(DMGCP, LOGL_ERROR, "Input is too long.\n"); |
| 370 | return NULL; |
| 371 | } |
| 372 | |
| 373 | output = msgb_alloc_headroom(4096, 128, "MGCP rewritten"); |
| 374 | if (!output) { |
| 375 | LOGP(DMGCP, LOGL_ERROR, "Failed to allocate new MGCP msg.\n"); |
| 376 | return NULL; |
| 377 | } |
| 378 | |
Holger Hans Peter Freyther | 8d20065 | 2010-04-04 18:09:10 +0200 | [diff] [blame] | 379 | running = input; |
Holger Hans Peter Freyther | 76c8354 | 2010-04-01 06:48:52 +0200 | [diff] [blame] | 380 | output->l2h = output->data; |
Holger Hans Peter Freyther | 9e5300a | 2010-04-04 19:34:44 +0200 | [diff] [blame] | 381 | for (token = strsep(&running, "\n"); running; token = strsep(&running, "\n")) { |
Holger Hans Peter Freyther | 76c8354 | 2010-04-01 06:48:52 +0200 | [diff] [blame] | 382 | int len = strlen(token); |
Holger Hans Peter Freyther | 9e5300a | 2010-04-04 19:34:44 +0200 | [diff] [blame] | 383 | int cr = len > 0 && token[len - 1] == '\r'; |
Holger Hans Peter Freyther | 76c8354 | 2010-04-01 06:48:52 +0200 | [diff] [blame] | 384 | |
| 385 | if (strncmp(ip_str, token, (sizeof ip_str) - 1) == 0) { |
| 386 | output->l3h = msgb_put(output, strlen(ip_str)); |
| 387 | memcpy(output->l3h, ip_str, strlen(ip_str)); |
| 388 | output->l3h = msgb_put(output, strlen(ip)); |
| 389 | memcpy(output->l3h, ip, strlen(ip)); |
Holger Hans Peter Freyther | 9e5300a | 2010-04-04 19:34:44 +0200 | [diff] [blame] | 390 | |
| 391 | if (cr) { |
| 392 | output->l3h = msgb_put(output, 2); |
| 393 | output->l3h[0] = '\r'; |
| 394 | output->l3h[1] = '\n'; |
| 395 | } else { |
| 396 | output->l3h = msgb_put(output, 1); |
| 397 | output->l3h[0] = '\n'; |
| 398 | } |
Holger Hans Peter Freyther | 76c8354 | 2010-04-01 06:48:52 +0200 | [diff] [blame] | 399 | } else if (strncmp(aud_str, token, (sizeof aud_str) - 1) == 0) { |
| 400 | int payload; |
| 401 | if (sscanf(token, "m=audio %*d RTP/AVP %d", &payload) != 1) { |
| 402 | LOGP(DMGCP, LOGL_ERROR, "Could not parsed audio line.\n"); |
| 403 | msgb_free(output); |
| 404 | return NULL; |
| 405 | } |
| 406 | |
Holger Hans Peter Freyther | 9e5300a | 2010-04-04 19:34:44 +0200 | [diff] [blame] | 407 | snprintf(buf, sizeof(buf)-1, "m=audio %d RTP/AVP %d%s", |
| 408 | port, payload, cr ? "\r\n" : "\n"); |
Holger Hans Peter Freyther | 76c8354 | 2010-04-01 06:48:52 +0200 | [diff] [blame] | 409 | buf[sizeof(buf)-1] = '\0'; |
| 410 | |
| 411 | output->l3h = msgb_put(output, strlen(buf)); |
| 412 | memcpy(output->l3h, buf, strlen(buf)); |
| 413 | } else { |
| 414 | output->l3h = msgb_put(output, len + 1); |
| 415 | memcpy(output->l3h, token, len); |
| 416 | output->l3h[len] = '\n'; |
| 417 | } |
| 418 | } |
| 419 | |
| 420 | return output; |
| 421 | } |
| 422 | |
Holger Hans Peter Freyther | a7f8018 | 2010-03-31 13:02:22 +0200 | [diff] [blame] | 423 | static int mgcp_do_read(struct bsc_fd *fd) |
| 424 | { |
| 425 | struct bsc_nat *nat; |
| 426 | struct msgb *msg, *resp; |
| 427 | int rc; |
| 428 | |
Holger Hans Peter Freyther | 8d20065 | 2010-04-04 18:09:10 +0200 | [diff] [blame] | 429 | nat = fd->data; |
| 430 | |
| 431 | rc = read(fd->fd, nat->mgcp_msg, sizeof(nat->mgcp_msg) - 1); |
| 432 | if (rc <= 0) { |
| 433 | LOGP(DMGCP, LOGL_ERROR, "Failed to read errno: %d\n", errno); |
| 434 | return -1; |
| 435 | } |
| 436 | |
| 437 | nat->mgcp_msg[rc] = '\0'; |
| 438 | nat->mgcp_length = rc; |
| 439 | |
| 440 | msg = msgb_alloc(sizeof(nat->mgcp_msg), "MGCP GW Read"); |
Holger Hans Peter Freyther | a7f8018 | 2010-03-31 13:02:22 +0200 | [diff] [blame] | 441 | if (!msg) { |
| 442 | LOGP(DMGCP, LOGL_ERROR, "Failed to create buffer.\n"); |
| 443 | return -1; |
| 444 | } |
| 445 | |
Holger Hans Peter Freyther | a7f8018 | 2010-03-31 13:02:22 +0200 | [diff] [blame] | 446 | msg->l2h = msgb_put(msg, rc); |
Holger Hans Peter Freyther | 8d20065 | 2010-04-04 18:09:10 +0200 | [diff] [blame] | 447 | memcpy(msg->l2h, nat->mgcp_msg, msgb_l2len(msg)); |
Holger Hans Peter Freyther | a7f8018 | 2010-03-31 13:02:22 +0200 | [diff] [blame] | 448 | resp = mgcp_handle_message(nat->mgcp_cfg, msg); |
| 449 | msgb_free(msg); |
| 450 | |
| 451 | /* we do have a direct answer... e.g. AUEP */ |
| 452 | if (resp) { |
| 453 | if (write_queue_enqueue(&nat->mgcp_queue, resp) != 0) { |
| 454 | LOGP(DMGCP, LOGL_ERROR, "Failed to enqueue msg.\n"); |
| 455 | msgb_free(resp); |
| 456 | } |
| 457 | } |
| 458 | |
| 459 | return 0; |
| 460 | } |
| 461 | |
| 462 | static int mgcp_do_write(struct bsc_fd *bfd, struct msgb *msg) |
| 463 | { |
| 464 | int rc; |
| 465 | |
| 466 | rc = write(bfd->fd, msg->data, msg->len); |
| 467 | |
| 468 | if (rc != msg->len) { |
| 469 | LOGP(DMGCP, LOGL_ERROR, "Failed to write msg to MGCP CallAgent.\n"); |
| 470 | return -1; |
| 471 | } |
| 472 | |
| 473 | return rc; |
| 474 | } |
| 475 | |
Holger Hans Peter Freyther | 7b7eef6 | 2010-04-22 12:08:17 +0800 | [diff] [blame] | 476 | int bsc_mgcp_nat_init(struct bsc_nat *nat) |
Holger Hans Peter Freyther | a7f8018 | 2010-03-31 13:02:22 +0200 | [diff] [blame] | 477 | { |
| 478 | int on; |
| 479 | struct sockaddr_in addr; |
| 480 | |
| 481 | if (!nat->mgcp_cfg->call_agent_addr) { |
| 482 | LOGP(DMGCP, LOGL_ERROR, "The BSC nat requires the call agent ip to be set.\n"); |
| 483 | return -1; |
| 484 | } |
| 485 | |
Holger Hans Peter Freyther | a0df82d | 2010-04-01 08:21:33 +0200 | [diff] [blame] | 486 | if (nat->mgcp_cfg->bts_ip) { |
| 487 | LOGP(DMGCP, LOGL_ERROR, "Do not set the BTS ip for the nat.\n"); |
| 488 | return -1; |
| 489 | } |
| 490 | |
Holger Hans Peter Freyther | a7f8018 | 2010-03-31 13:02:22 +0200 | [diff] [blame] | 491 | nat->mgcp_queue.bfd.fd = socket(AF_INET, SOCK_DGRAM, 0); |
| 492 | if (nat->mgcp_queue.bfd.fd < 0) { |
| 493 | LOGP(DMGCP, LOGL_ERROR, "Failed to create MGCP socket. errno: %d\n", errno); |
| 494 | return -1; |
| 495 | } |
| 496 | |
| 497 | on = 1; |
| 498 | setsockopt(nat->mgcp_queue.bfd.fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); |
| 499 | |
| 500 | addr.sin_family = AF_INET; |
| 501 | addr.sin_port = htons(nat->mgcp_cfg->source_port); |
| 502 | inet_aton(nat->mgcp_cfg->source_addr, &addr.sin_addr); |
| 503 | |
| 504 | if (bind(nat->mgcp_queue.bfd.fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) { |
| 505 | LOGP(DMGCP, LOGL_ERROR, "Failed to bind. errno: %d\n", errno); |
| 506 | close(nat->mgcp_queue.bfd.fd); |
| 507 | nat->mgcp_queue.bfd.fd = -1; |
| 508 | return -1; |
| 509 | } |
| 510 | |
| 511 | addr.sin_port = htons(2727); |
| 512 | inet_aton(nat->mgcp_cfg->call_agent_addr, &addr.sin_addr); |
| 513 | if (connect(nat->mgcp_queue.bfd.fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) { |
| 514 | LOGP(DMGCP, LOGL_ERROR, "Failed to connect to: '%s'. errno: %d\n", |
| 515 | nat->mgcp_cfg->call_agent_addr, errno); |
| 516 | close(nat->mgcp_queue.bfd.fd); |
| 517 | nat->mgcp_queue.bfd.fd = -1; |
| 518 | return -1; |
| 519 | } |
| 520 | |
| 521 | write_queue_init(&nat->mgcp_queue, 10); |
| 522 | nat->mgcp_queue.bfd.when = BSC_FD_READ; |
| 523 | nat->mgcp_queue.bfd.data = nat; |
| 524 | nat->mgcp_queue.read_cb = mgcp_do_read; |
| 525 | nat->mgcp_queue.write_cb = mgcp_do_write; |
| 526 | |
| 527 | if (bsc_register_fd(&nat->mgcp_queue.bfd) != 0) { |
| 528 | LOGP(DMGCP, LOGL_ERROR, "Failed to register MGCP fd.\n"); |
| 529 | close(nat->mgcp_queue.bfd.fd); |
| 530 | nat->mgcp_queue.bfd.fd = -1; |
| 531 | return -1; |
| 532 | } |
| 533 | |
Holger Hans Peter Freyther | a0df82d | 2010-04-01 08:21:33 +0200 | [diff] [blame] | 534 | /* some more MGCP config handling */ |
Holger Hans Peter Freyther | 4ad5850 | 2010-04-06 11:14:03 +0200 | [diff] [blame] | 535 | nat->mgcp_cfg->audio_payload = -1; |
Holger Hans Peter Freyther | a0df82d | 2010-04-01 08:21:33 +0200 | [diff] [blame] | 536 | nat->mgcp_cfg->data = nat; |
| 537 | nat->mgcp_cfg->policy_cb = bsc_mgcp_policy_cb; |
Holger Hans Peter Freyther | bba5934 | 2010-04-07 10:52:48 +0200 | [diff] [blame] | 538 | nat->mgcp_cfg->force_realloc = 1; |
Holger Hans Peter Freyther | 290d84e | 2010-04-09 18:51:01 +0200 | [diff] [blame] | 539 | nat->mgcp_cfg->bts_ip = ""; |
Holger Hans Peter Freyther | a0df82d | 2010-04-01 08:21:33 +0200 | [diff] [blame] | 540 | nat->bsc_endpoints = talloc_zero_array(nat, |
| 541 | struct bsc_endpoint, |
| 542 | nat->mgcp_cfg->number_endpoints + 1); |
| 543 | |
Holger Hans Peter Freyther | a7f8018 | 2010-03-31 13:02:22 +0200 | [diff] [blame] | 544 | return 0; |
| 545 | } |
Holger Hans Peter Freyther | 26a4389 | 2010-04-05 23:09:27 +0200 | [diff] [blame] | 546 | |
| 547 | void bsc_mgcp_clear_endpoints_for(struct bsc_connection *bsc) |
| 548 | { |
Holger Hans Peter Freyther | 8330c1c | 2010-06-17 18:29:42 +0800 | [diff] [blame] | 549 | struct rate_ctr *ctr = NULL; |
Holger Hans Peter Freyther | 26a4389 | 2010-04-05 23:09:27 +0200 | [diff] [blame] | 550 | int i; |
Holger Hans Peter Freyther | 8330c1c | 2010-06-17 18:29:42 +0800 | [diff] [blame] | 551 | |
| 552 | if (bsc->cfg) |
| 553 | ctr = &bsc->cfg->stats.ctrg->ctr[BCFG_CTR_DROPPED_CALLS]; |
| 554 | |
Holger Hans Peter Freyther | 26a4389 | 2010-04-05 23:09:27 +0200 | [diff] [blame] | 555 | for (i = 1; i < bsc->nat->mgcp_cfg->number_endpoints; ++i) { |
| 556 | struct bsc_endpoint *bsc_endp = &bsc->nat->bsc_endpoints[i]; |
| 557 | |
| 558 | if (bsc_endp->bsc != bsc) |
| 559 | continue; |
| 560 | |
Holger Hans Peter Freyther | 8330c1c | 2010-06-17 18:29:42 +0800 | [diff] [blame] | 561 | if (ctr) |
| 562 | rate_ctr_inc(ctr); |
| 563 | |
Holger Hans Peter Freyther | 7b7eef6 | 2010-04-22 12:08:17 +0800 | [diff] [blame] | 564 | bsc_mgcp_free_endpoint(bsc->nat, i); |
Holger Hans Peter Freyther | 26a4389 | 2010-04-05 23:09:27 +0200 | [diff] [blame] | 565 | mgcp_free_endp(&bsc->nat->mgcp_cfg->endpoints[i]); |
| 566 | } |
| 567 | } |