Neels Hofmeyr | 84da6b1 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 1 | /* Code to manage MSC subscriber connections over IuCS interface */ |
| 2 | |
| 3 | /* |
| 4 | * (C) 2016,2017 by sysmocom s.f.m.c. GmbH <info@sysmocom.de> |
| 5 | * |
| 6 | * Author: Neels Hofmeyr <nhofmeyr@sysmocom.de> |
| 7 | * |
| 8 | * All Rights Reserved |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU Affero General Public License as published by |
| 12 | * the Free Software Foundation; either version 3 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU Affero General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU Affero General Public License |
| 21 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 22 | * |
| 23 | */ |
| 24 | |
| 25 | #include <inttypes.h> |
| 26 | |
| 27 | #include <osmocom/core/logging.h> |
Neels Hofmeyr | 00e82d6 | 2017-07-05 15:19:52 +0200 | [diff] [blame] | 28 | #include <osmocom/ranap/iu_client.h> |
Neels Hofmeyr | 9084396 | 2017-09-04 15:04:35 +0200 | [diff] [blame] | 29 | #include <osmocom/msc/debug.h> |
Neels Hofmeyr | 84da6b1 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 30 | |
Neels Hofmeyr | 9084396 | 2017-09-04 15:04:35 +0200 | [diff] [blame] | 31 | #include <osmocom/msc/gsm_data.h> |
| 32 | #include <osmocom/msc/gsm_subscriber.h> |
Philipp Maier | 621ba03 | 2017-11-07 17:19:25 +0100 | [diff] [blame] | 33 | #include <osmocom/msc/transaction.h> |
Neels Hofmeyr | 9084396 | 2017-09-04 15:04:35 +0200 | [diff] [blame] | 34 | #include <osmocom/msc/osmo_msc.h> |
| 35 | #include <osmocom/msc/vlr.h> |
Philipp Maier | 621ba03 | 2017-11-07 17:19:25 +0100 | [diff] [blame] | 36 | #include <osmocom/core/byteswap.h> |
| 37 | |
| 38 | #include "../../bscconfig.h" |
| 39 | |
| 40 | #ifdef BUILD_IU |
| 41 | #include <osmocom/ranap/iu_client.h> |
| 42 | extern struct msgb *ranap_new_msg_rab_assign_voice(uint8_t rab_id, |
| 43 | uint32_t rtp_ip, |
| 44 | uint16_t rtp_port, |
| 45 | bool use_x213_nsap); |
| 46 | #else |
| 47 | #include <osmocom/msc/iu_dummy.h> |
| 48 | #endif /* BUILD_IU */ |
Neels Hofmeyr | 84da6b1 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 49 | |
| 50 | /* For A-interface see libbsc/bsc_api.c subscr_con_allocate() */ |
| 51 | static struct gsm_subscriber_connection *subscr_conn_allocate_iu(struct gsm_network *network, |
Neels Hofmeyr | 00e82d6 | 2017-07-05 15:19:52 +0200 | [diff] [blame] | 52 | struct ranap_ue_conn_ctx *ue, |
Neels Hofmeyr | 84da6b1 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 53 | uint16_t lac) |
| 54 | { |
| 55 | struct gsm_subscriber_connection *conn; |
| 56 | |
Philipp Maier | fbf6610 | 2017-04-09 12:32:51 +0200 | [diff] [blame] | 57 | DEBUGP(DIUCS, "Allocating IuCS subscriber conn: lac %d, conn_id %" PRIx32 "\n", |
| 58 | lac, ue->conn_id); |
Neels Hofmeyr | 84da6b1 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 59 | |
Neels Hofmeyr | 93c7463 | 2018-04-02 23:10:28 +0200 | [diff] [blame^] | 60 | conn = msc_subscr_conn_alloc(network, RAN_UTRAN_IU, lac); |
Neels Hofmeyr | 84da6b1 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 61 | if (!conn) |
| 62 | return NULL; |
| 63 | |
Neels Hofmeyr | 84da6b1 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 64 | conn->iu.ue_ctx = ue; |
| 65 | conn->iu.ue_ctx->rab_assign_addr_enc = network->iu.rab_assign_addr_enc; |
Neels Hofmeyr | 84da6b1 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 66 | return conn; |
| 67 | } |
| 68 | |
Neels Hofmeyr | 00e82d6 | 2017-07-05 15:19:52 +0200 | [diff] [blame] | 69 | static int same_ue_conn(struct ranap_ue_conn_ctx *a, struct ranap_ue_conn_ctx *b) |
Neels Hofmeyr | 84da6b1 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 70 | { |
| 71 | if (a == b) |
| 72 | return 1; |
Philipp Maier | fbf6610 | 2017-04-09 12:32:51 +0200 | [diff] [blame] | 73 | return (a->conn_id == b->conn_id); |
Neels Hofmeyr | 84da6b1 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 74 | } |
| 75 | |
| 76 | static inline void log_subscribers(struct gsm_network *network) |
| 77 | { |
| 78 | if (!log_check_level(DIUCS, LOGL_DEBUG)) |
| 79 | return; |
| 80 | |
| 81 | struct gsm_subscriber_connection *conn; |
| 82 | int i = 0; |
| 83 | llist_for_each_entry(conn, &network->subscr_conns, entry) { |
| 84 | DEBUGP(DIUCS, "%3d: %s", i, vlr_subscr_name(conn->vsub)); |
| 85 | switch (conn->via_ran) { |
| 86 | case RAN_UTRAN_IU: |
| 87 | DEBUGPC(DIUCS, " Iu"); |
| 88 | if (conn->iu.ue_ctx) { |
Philipp Maier | fbf6610 | 2017-04-09 12:32:51 +0200 | [diff] [blame] | 89 | DEBUGPC(DIUCS, " conn_id %d", |
Neels Hofmeyr | 84da6b1 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 90 | conn->iu.ue_ctx->conn_id |
| 91 | ); |
| 92 | } |
| 93 | break; |
| 94 | case RAN_GERAN_A: |
| 95 | DEBUGPC(DIUCS, " A"); |
| 96 | /* TODO log A-interface connection details */ |
| 97 | break; |
| 98 | case RAN_UNKNOWN: |
| 99 | DEBUGPC(DIUCS, " ?"); |
| 100 | break; |
| 101 | default: |
| 102 | DEBUGPC(DIUCS, " invalid"); |
| 103 | break; |
| 104 | } |
| 105 | DEBUGPC(DIUCS, "\n"); |
| 106 | i++; |
| 107 | } |
| 108 | DEBUGP(DIUCS, "subscribers registered: %d\n", i); |
| 109 | } |
| 110 | |
Philipp Maier | fbf6610 | 2017-04-09 12:32:51 +0200 | [diff] [blame] | 111 | /* Return an existing IuCS subscriber connection record for the given |
Neels Hofmeyr | 84da6b1 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 112 | * connection IDs, or return NULL if not found. */ |
| 113 | struct gsm_subscriber_connection *subscr_conn_lookup_iu( |
| 114 | struct gsm_network *network, |
Neels Hofmeyr | 00e82d6 | 2017-07-05 15:19:52 +0200 | [diff] [blame] | 115 | struct ranap_ue_conn_ctx *ue) |
Neels Hofmeyr | 84da6b1 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 116 | { |
| 117 | struct gsm_subscriber_connection *conn; |
| 118 | |
Philipp Maier | fbf6610 | 2017-04-09 12:32:51 +0200 | [diff] [blame] | 119 | DEBUGP(DIUCS, "Looking for IuCS subscriber: conn_id %" PRIx32 "\n", |
| 120 | ue->conn_id); |
Neels Hofmeyr | 84da6b1 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 121 | log_subscribers(network); |
| 122 | |
| 123 | llist_for_each_entry(conn, &network->subscr_conns, entry) { |
| 124 | if (conn->via_ran != RAN_UTRAN_IU) |
| 125 | continue; |
| 126 | if (!same_ue_conn(conn->iu.ue_ctx, ue)) |
| 127 | continue; |
Philipp Maier | fbf6610 | 2017-04-09 12:32:51 +0200 | [diff] [blame] | 128 | DEBUGP(DIUCS, "Found IuCS subscriber for conn_id %" PRIx32 "\n", |
| 129 | ue->conn_id); |
Neels Hofmeyr | 84da6b1 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 130 | return conn; |
| 131 | } |
Philipp Maier | fbf6610 | 2017-04-09 12:32:51 +0200 | [diff] [blame] | 132 | DEBUGP(DIUCS, "No IuCS subscriber found for conn_id %" PRIx32 "\n", |
| 133 | ue->conn_id); |
Neels Hofmeyr | 84da6b1 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 134 | return NULL; |
| 135 | } |
| 136 | |
| 137 | /* Receive MM/CC/... message from IuCS (SCCP user SAP). |
Neels Hofmeyr | 00e82d6 | 2017-07-05 15:19:52 +0200 | [diff] [blame] | 138 | * msg->dst must reference a struct ranap_ue_conn_ctx, which identifies the peer that |
Neels Hofmeyr | 84da6b1 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 139 | * sent the msg. |
| 140 | * |
| 141 | * For A-interface see libbsc/bsc_api.c gsm0408_rcvmsg(). */ |
| 142 | int gsm0408_rcvmsg_iucs(struct gsm_network *network, struct msgb *msg, |
| 143 | uint16_t *lac) |
| 144 | { |
| 145 | int rc; |
Neels Hofmeyr | 00e82d6 | 2017-07-05 15:19:52 +0200 | [diff] [blame] | 146 | struct ranap_ue_conn_ctx *ue_ctx; |
Neels Hofmeyr | 84da6b1 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 147 | struct gsm_subscriber_connection *conn; |
| 148 | |
Neels Hofmeyr | 00e82d6 | 2017-07-05 15:19:52 +0200 | [diff] [blame] | 149 | ue_ctx = (struct ranap_ue_conn_ctx*)msg->dst; |
Neels Hofmeyr | 84da6b1 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 150 | |
| 151 | /* TODO: are there message types that could allow us to skip this |
| 152 | * search? */ |
| 153 | conn = subscr_conn_lookup_iu(network, ue_ctx); |
| 154 | |
| 155 | if (conn && lac && (conn->lac != *lac)) { |
| 156 | LOGP(DIUCS, LOGL_ERROR, "IuCS subscriber has changed LAC" |
| 157 | " within the same connection, discarding connection:" |
| 158 | " %s from LAC %d to %d\n", |
| 159 | vlr_subscr_name(conn->vsub), conn->lac, *lac); |
| 160 | /* Deallocate conn with previous LAC */ |
| 161 | msc_subscr_conn_close(conn, GSM_CAUSE_INV_MAND_INFO); |
| 162 | /* At this point we could be tolerant and allocate a new |
| 163 | * connection, but changing the LAC within the same connection |
| 164 | * is shifty. Rather cancel everything. */ |
| 165 | return -1; |
| 166 | } |
| 167 | |
| 168 | if (conn) { |
| 169 | /* Make sure we don't receive RR over IuCS; otherwise all |
| 170 | * messages handled by gsm0408_dispatch() are of interest (CC, |
| 171 | * MM, SMS, NS_SS, maybe even MM_GPRS and SM_GPRS). */ |
| 172 | struct gsm48_hdr *gh = msgb_l3(msg); |
| 173 | uint8_t pdisc = gh->proto_discr & 0x0f; |
| 174 | OSMO_ASSERT(pdisc != GSM48_PDISC_RR); |
| 175 | |
| 176 | msc_dtap(conn, ue_ctx->conn_id, msg); |
| 177 | rc = 0; |
| 178 | } else { |
| 179 | /* allocate a new connection */ |
| 180 | |
| 181 | if (!lac) { |
| 182 | LOGP(DIUCS, LOGL_ERROR, "New IuCS subscriber" |
| 183 | " but no LAC available. Expecting an InitialUE" |
| 184 | " message containing a LAI IE." |
| 185 | " Dropping connection.\n"); |
| 186 | return -1; |
| 187 | } |
| 188 | |
| 189 | conn = subscr_conn_allocate_iu(network, ue_ctx, *lac); |
| 190 | if (!conn) |
| 191 | abort(); |
| 192 | |
| 193 | /* ownership of conn hereby goes to the MSC: */ |
| 194 | rc = msc_compl_l3(conn, msg, 0); |
| 195 | } |
| 196 | |
| 197 | return rc; |
| 198 | } |
Philipp Maier | 621ba03 | 2017-11-07 17:19:25 +0100 | [diff] [blame] | 199 | |
| 200 | int iu_rab_act_cs(struct gsm_trans *trans) |
| 201 | { |
| 202 | struct gsm_subscriber_connection *conn; |
| 203 | struct msgb *msg; |
| 204 | bool use_x213_nsap; |
| 205 | uint32_t conn_id; |
| 206 | struct ranap_ue_conn_ctx *uectx; |
| 207 | uint8_t rab_id; |
| 208 | uint32_t rtp_ip; |
| 209 | uint16_t rtp_port; |
| 210 | |
| 211 | conn = trans->conn; |
| 212 | uectx = conn->iu.ue_ctx; |
| 213 | rab_id = conn->iu.rab_id; |
| 214 | rtp_ip = osmo_htonl(inet_addr(conn->rtp.local_addr_ran)); |
| 215 | rtp_port = conn->rtp.local_port_ran; |
| 216 | conn_id = uectx->conn_id; |
| 217 | |
| 218 | if (rtp_ip == INADDR_NONE) { |
| 219 | LOGP(DIUCS, LOGL_DEBUG, |
| 220 | "Assigning RAB: conn_id=%u, rab_id=%d, invalid RTP IP-Address\n", |
| 221 | conn_id, rab_id); |
| 222 | return -EINVAL; |
| 223 | } |
| 224 | if (rtp_port == 0) { |
| 225 | LOGP(DIUCS, LOGL_DEBUG, |
| 226 | "Assigning RAB: conn_id=%u, rab_id=%d, invalid RTP Port\n", |
| 227 | conn_id, rab_id); |
| 228 | return -EINVAL; |
| 229 | } |
| 230 | |
| 231 | use_x213_nsap = |
| 232 | (uectx->rab_assign_addr_enc == RANAP_NSAP_ADDR_ENC_X213); |
| 233 | |
| 234 | LOGP(DIUCS, LOGL_DEBUG, |
| 235 | "Assigning RAB: conn_id=%u, rab_id=%d, rtp=%x:%u, use_x213_nsap=%d\n", |
| 236 | conn_id, rab_id, rtp_ip, rtp_port, use_x213_nsap); |
| 237 | |
| 238 | msg = ranap_new_msg_rab_assign_voice(rab_id, rtp_ip, rtp_port, |
| 239 | use_x213_nsap); |
| 240 | msg->l2h = msg->data; |
| 241 | |
| 242 | if (ranap_iu_rab_act(uectx, msg)) |
| 243 | LOGP(DIUCS, LOGL_ERROR, |
| 244 | "Failed to send RAB Assignment: conn_id=%d rab_id=%d rtp=%x:%u\n", |
| 245 | conn_id, rab_id, rtp_ip, rtp_port); |
| 246 | return 0; |
| 247 | } |
| 248 | |
Daniel Willmann | 6fbd3bf | 2018-02-15 10:33:21 +0100 | [diff] [blame] | 249 | uint32_t iu_get_conn_id(const struct ranap_ue_conn_ctx *ue) |
| 250 | { |
| 251 | return ue->conn_id; |
| 252 | } |