Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1 | /* BSSAP/BSSMAP encoding and decoding for MSC */ |
| 2 | /* |
Vadim Yanitskiy | 999a593 | 2023-05-18 17:22:26 +0700 | [diff] [blame] | 3 | * (C) 2019 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de> |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 4 | * All Rights Reserved |
| 5 | * |
| 6 | * Author: Neels Hofmeyr |
| 7 | * |
| 8 | * SPDX-License-Identifier: GPL-2.0+ |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 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 General Public License for more details. |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 19 | */ |
| 20 | |
| 21 | #include <osmocom/core/byteswap.h> |
| 22 | |
| 23 | #include <osmocom/crypt/auth.h> |
Neels Hofmeyr | 6ce2edc | 2021-06-09 22:26:11 +0200 | [diff] [blame] | 24 | #include <osmocom/crypt/kdf.h> |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 25 | |
| 26 | #include <osmocom/gsm/tlv.h> |
| 27 | #include <osmocom/gsm/gsm0808.h> |
| 28 | #include <osmocom/gsm/mncc.h> |
| 29 | #include <osmocom/gsm/gsm48.h> |
| 30 | |
| 31 | #include <osmocom/msc/debug.h> |
| 32 | #include <osmocom/msc/ran_msg_a.h> |
| 33 | #include <osmocom/msc/sccp_ran.h> |
Pau Espin Pedrol | c9ba754 | 2019-05-07 12:23:49 +0200 | [diff] [blame] | 34 | #include <osmocom/msc/gsm_data.h> |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 35 | |
| 36 | #define LOG_RAN_A_DEC(RAN_DEC, level, fmt, args...) \ |
| 37 | LOG_RAN_DEC(RAN_DEC, DBSSAP, level, "BSSMAP: " fmt, ## args) |
| 38 | |
| 39 | /* Assumes presence of struct ran_dec *ran_dec and ran_dec_msg.msg_name (set) in the local scope. */ |
| 40 | #define LOG_RAN_A_DEC_MSG(level, fmt, args...) \ |
| 41 | LOG_RAN_DEC(ran_dec, DBSSAP, level, "%s: " fmt, ran_dec_msg.msg_name, ## args) |
| 42 | |
| 43 | #define LOG_RAN_A_ENC(FI, level, fmt, args...) \ |
| 44 | LOG_RAN_ENC(FI, DBSSAP, level, "BSSMAP: " fmt, ## args) |
| 45 | |
| 46 | static int ran_a_decode_l3_compl(struct ran_dec *ran_dec, struct msgb *msg, struct tlv_parsed *tp) |
| 47 | { |
| 48 | struct gsm0808_cell_id_list2 cil; |
| 49 | struct gsm0808_cell_id cell_id; |
| 50 | struct tlv_p_entry *ie_cell_id = TLVP_GET(tp, GSM0808_IE_CELL_IDENTIFIER); |
| 51 | struct tlv_p_entry *ie_l3_info = TLVP_GET(tp, GSM0808_IE_LAYER_3_INFORMATION); |
Neels Hofmeyr | 8a50cfb | 2019-10-21 03:01:00 +0200 | [diff] [blame] | 52 | struct tlv_p_entry *ie_codec_list_bss_supported = TLVP_GET(tp, GSM0808_IE_SPEECH_CODEC_LIST); |
| 53 | struct gsm0808_speech_codec_list codec_list_bss_supported; |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 54 | struct ran_msg ran_dec_msg = { |
| 55 | .msg_type = RAN_MSG_COMPL_L3, |
Neels Hofmeyr | 0c1ed15 | 2019-10-21 03:12:58 +0200 | [diff] [blame] | 56 | .msg_name = "BSSMAP Complete Layer 3 Information", |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 57 | .compl_l3 = { |
| 58 | .cell_id = &cell_id, |
| 59 | .msg = msg, |
| 60 | }, |
| 61 | }; |
| 62 | int rc; |
| 63 | |
| 64 | if (!ie_cell_id) { |
| 65 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Mandatory CELL IDENTIFIER not present, discarding message\n"); |
| 66 | return -EINVAL; |
| 67 | } |
| 68 | if (!ie_l3_info) { |
| 69 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Mandatory LAYER 3 INFORMATION not present, discarding message\n"); |
| 70 | return -EINVAL; |
| 71 | } |
| 72 | |
| 73 | /* Parse Cell ID element -- this should yield a cell identifier "list" with 1 element. */ |
| 74 | |
| 75 | rc = gsm0808_dec_cell_id_list2(&cil, ie_cell_id->val, ie_cell_id->len); |
| 76 | if (rc < 0) { |
| 77 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Decoding CELL IDENTIFIER gave rc=%d\n", rc); |
| 78 | return -EINVAL; |
| 79 | } |
| 80 | if (cil.id_list_len != 1) { |
| 81 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Unable to parse element CELL IDENTIFIER, discarding message\n"); |
| 82 | return -EINVAL; |
| 83 | } |
| 84 | |
| 85 | /* Sanity check the Cell Identity */ |
| 86 | switch (cil.id_discr) { |
| 87 | case CELL_IDENT_WHOLE_GLOBAL: |
| 88 | case CELL_IDENT_LAI_AND_LAC: |
| 89 | case CELL_IDENT_LAC_AND_CI: |
| 90 | case CELL_IDENT_LAC: |
| 91 | break; |
| 92 | |
| 93 | case CELL_IDENT_CI: |
| 94 | case CELL_IDENT_NO_CELL: |
| 95 | case CELL_IDENT_BSS: |
| 96 | default: |
| 97 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "CELL IDENTIFIER does not specify a LAC, discarding message: %s\n", |
| 98 | gsm0808_cell_id_list_name(&cil)); |
| 99 | return -EINVAL; |
| 100 | } |
| 101 | |
| 102 | cell_id = (struct gsm0808_cell_id){ |
| 103 | .id_discr = cil.id_discr, |
| 104 | .id = cil.id_list[0], |
| 105 | }; |
| 106 | |
Neels Hofmeyr | ede9083 | 2022-01-13 18:13:15 +0100 | [diff] [blame] | 107 | /* Parse Layer 3 Information element; point ran_dec_msg->compl_l3.msg to the L3 Info data */ |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 108 | msg->l3h = (uint8_t*)ie_l3_info->val; |
| 109 | msgb_l3trim(msg, ie_l3_info->len); |
| 110 | |
| 111 | if (msgb_l3len(msg) < sizeof(struct gsm48_hdr)) { |
| 112 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "too short L3 info (%d), discarding message\n", msgb_l3len(msg)); |
| 113 | return -ENODATA; |
| 114 | } |
| 115 | |
Neels Hofmeyr | 8a50cfb | 2019-10-21 03:01:00 +0200 | [diff] [blame] | 116 | /* Decode Codec List (BSS Supported) */ |
| 117 | if (ie_codec_list_bss_supported) { |
| 118 | rc = gsm0808_dec_speech_codec_list(&codec_list_bss_supported, |
| 119 | ie_codec_list_bss_supported->val, ie_codec_list_bss_supported->len); |
| 120 | if (rc < 0) { |
| 121 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, |
| 122 | "Complete Layer 3 Information: unable to decode IE Codec List (BSS Supported)" |
| 123 | " (rc=%d), continuing anyway\n", rc); |
| 124 | /* This IE is not critical, do not abort with error. */ |
| 125 | } else |
| 126 | ran_dec_msg.compl_l3.codec_list_bss_supported = &codec_list_bss_supported; |
| 127 | } |
| 128 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 129 | return ran_decoded(ran_dec, &ran_dec_msg); |
| 130 | } |
| 131 | |
| 132 | static int ran_a_decode_clear_request(struct ran_dec *ran_dec, struct msgb *msg, struct tlv_parsed *tp) |
| 133 | { |
| 134 | struct tlv_p_entry *ie_cause = TLVP_GET(tp, GSM0808_IE_CAUSE); |
| 135 | struct ran_msg ran_dec_msg = { |
| 136 | .msg_type = RAN_MSG_CLEAR_REQUEST, |
| 137 | .msg_name = "BSSMAP Clear Request", |
| 138 | }; |
| 139 | |
| 140 | if (!ie_cause) { |
| 141 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Cause code is missing, using GSM0808_CAUSE_EQUIPMENT_FAILURE\n"); |
| 142 | ran_dec_msg.clear_request.bssap_cause = GSM0808_CAUSE_EQUIPMENT_FAILURE; |
| 143 | } else { |
| 144 | ran_dec_msg.clear_request.bssap_cause = ie_cause->val[0]; |
| 145 | } |
| 146 | |
| 147 | return ran_decoded(ran_dec, &ran_dec_msg); |
| 148 | } |
| 149 | |
| 150 | static int ran_a_decode_clear_complete(struct ran_dec *ran_dec, struct msgb *msg, struct tlv_parsed *tp) |
| 151 | { |
| 152 | struct ran_msg ran_dec_msg = { |
| 153 | .msg_type = RAN_MSG_CLEAR_COMPLETE, |
| 154 | .msg_name = "BSSMAP Clear Complete", |
| 155 | }; |
| 156 | return ran_decoded(ran_dec, &ran_dec_msg); |
| 157 | } |
| 158 | |
| 159 | static int ran_a_decode_classmark_update(struct ran_dec *ran_dec, struct msgb *msg, struct tlv_parsed *tp) |
| 160 | { |
| 161 | struct tlv_p_entry *ie_cm2 = TLVP_GET(tp, GSM0808_IE_CLASSMARK_INFORMATION_T2); |
| 162 | struct tlv_p_entry *ie_cm3 = TLVP_GET(tp, GSM0808_IE_CLASSMARK_INFORMATION_T3); |
| 163 | struct osmo_gsm48_classmark cm = {}; |
| 164 | struct ran_msg ran_dec_msg = { |
| 165 | .msg_type = RAN_MSG_CLASSMARK_UPDATE, |
| 166 | .msg_name = "BSSMAP Classmark Update", |
| 167 | .classmark_update = { |
| 168 | .classmark = &cm, |
| 169 | }, |
| 170 | }; |
| 171 | |
| 172 | if (!ie_cm2) { |
| 173 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "mandatory Classmark Information Type 2 not present, discarding message\n"); |
| 174 | return -EINVAL; |
| 175 | } |
| 176 | |
| 177 | cm.classmark2_len = OSMO_MIN(sizeof(cm.classmark2), ie_cm2->len); |
| 178 | memcpy(&cm.classmark2, ie_cm2->val, cm.classmark2_len); |
| 179 | |
| 180 | if (ie_cm3) { |
| 181 | cm.classmark3_len = OSMO_MIN(sizeof(cm.classmark3), ie_cm3->len); |
| 182 | memcpy(&cm.classmark3, ie_cm3->val, cm.classmark3_len); |
| 183 | } |
| 184 | |
| 185 | return ran_decoded(ran_dec, &ran_dec_msg); |
| 186 | } |
| 187 | |
| 188 | static int ran_a_decode_cipher_mode_complete(struct ran_dec *ran_dec, struct msgb *msg, struct tlv_parsed *tp) |
| 189 | { |
| 190 | struct tlv_p_entry *ie_chosen_encr_alg = TLVP_GET(tp, GSM0808_IE_CHOSEN_ENCR_ALG); |
| 191 | struct tlv_p_entry *ie_l3_msg = TLVP_GET(tp, GSM0808_IE_LAYER_3_MESSAGE_CONTENTS); |
| 192 | int rc; |
| 193 | struct ran_msg ran_dec_msg = { |
| 194 | .msg_type = RAN_MSG_CIPHER_MODE_COMPLETE, |
| 195 | .msg_name = "BSSMAP Ciphering Mode Complete", |
| 196 | }; |
| 197 | |
| 198 | if (ie_chosen_encr_alg) { |
| 199 | uint8_t ie_val = ie_chosen_encr_alg->val[0]; |
| 200 | /* 3GPP TS 48.008 3.2.2.44 Chosen Encryption Algorithm encodes as 1 = no encryption, 2 = A5/1, 4 = A5/3. |
| 201 | * Internally we handle without this weird off-by-one. */ |
| 202 | if (ie_val < 1 || ie_val > 8) |
| 203 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Unsupported value for 3.2.2.44 Chosen Encryption Algorithm: %u\n", |
| 204 | ie_val); |
| 205 | else |
| 206 | ran_dec_msg.cipher_mode_complete.alg_id = ie_chosen_encr_alg->val[0]; |
| 207 | } |
| 208 | |
Neels Hofmeyr | e9a3911 | 2019-08-29 00:10:49 +0200 | [diff] [blame] | 209 | if (ie_l3_msg) |
| 210 | ran_dec_msg.cipher_mode_complete.l3_msg = ie_l3_msg; |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 211 | |
Neels Hofmeyr | e9a3911 | 2019-08-29 00:10:49 +0200 | [diff] [blame] | 212 | rc = ran_decoded(ran_dec, &ran_dec_msg); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 213 | |
| 214 | return rc; |
| 215 | } |
| 216 | |
| 217 | static int ran_a_decode_cipher_mode_reject(struct ran_dec *ran_dec, struct msgb *msg, struct tlv_parsed *tp) |
| 218 | { |
| 219 | int rc; |
| 220 | struct ran_msg ran_dec_msg = { |
| 221 | .msg_type = RAN_MSG_CIPHER_MODE_REJECT, |
| 222 | .msg_name = "BSSMAP Ciphering Mode Reject", |
| 223 | }; |
| 224 | |
Vadim Yanitskiy | 33144f1 | 2021-02-05 20:14:19 +0100 | [diff] [blame] | 225 | rc = gsm0808_get_cause(tp); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 226 | if (rc < 0) { |
| 227 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "failed to extract Cause\n"); |
| 228 | ran_dec_msg.cipher_mode_reject.bssap_cause = GSM0808_CAUSE_EQUIPMENT_FAILURE; |
| 229 | } else { |
| 230 | ran_dec_msg.cipher_mode_reject.bssap_cause = (enum gsm0808_cause)rc; |
| 231 | } |
| 232 | |
| 233 | return ran_decoded(ran_dec, &ran_dec_msg); |
| 234 | } |
| 235 | |
| 236 | enum mgcp_codecs ran_a_mgcp_codec_from_sc(const struct gsm0808_speech_codec *sc) |
| 237 | { |
| 238 | switch (sc->type) { |
| 239 | case GSM0808_SCT_FR1: |
| 240 | return CODEC_GSM_8000_1; |
| 241 | break; |
| 242 | case GSM0808_SCT_FR2: |
| 243 | return CODEC_GSMEFR_8000_1; |
| 244 | break; |
| 245 | case GSM0808_SCT_FR3: |
| 246 | return CODEC_AMR_8000_1; |
| 247 | break; |
| 248 | case GSM0808_SCT_FR4: |
| 249 | return CODEC_AMRWB_16000_1; |
| 250 | break; |
| 251 | case GSM0808_SCT_FR5: |
| 252 | return CODEC_AMRWB_16000_1; |
| 253 | break; |
| 254 | case GSM0808_SCT_HR1: |
| 255 | return CODEC_GSMHR_8000_1; |
| 256 | break; |
| 257 | case GSM0808_SCT_HR3: |
| 258 | return CODEC_AMR_8000_1; |
| 259 | break; |
| 260 | case GSM0808_SCT_HR4: |
| 261 | return CODEC_AMRWB_16000_1; |
| 262 | break; |
| 263 | case GSM0808_SCT_HR6: |
| 264 | return CODEC_AMRWB_16000_1; |
| 265 | break; |
| 266 | default: |
| 267 | return CODEC_PCMU_8000_1; |
| 268 | break; |
| 269 | } |
| 270 | } |
| 271 | |
| 272 | static int ran_a_decode_assignment_complete(struct ran_dec *ran_dec, struct msgb *msg, struct tlv_parsed *tp) |
| 273 | { |
| 274 | struct tlv_p_entry *ie_aoip_transp_addr = TLVP_GET(tp, GSM0808_IE_AOIP_TRASP_ADDR); |
| 275 | struct tlv_p_entry *ie_speech_codec = TLVP_GET(tp, GSM0808_IE_SPEECH_CODEC); |
Neels Hofmeyr | 8a50cfb | 2019-10-21 03:01:00 +0200 | [diff] [blame] | 276 | struct tlv_p_entry *ie_codec_list_bss_supported = TLVP_GET(tp, GSM0808_IE_SPEECH_CODEC_LIST); |
Pau Espin Pedrol | a3cdab4 | 2019-05-09 17:54:08 +0200 | [diff] [blame] | 277 | struct tlv_p_entry *ie_osmux_cid = TLVP_GET(tp, GSM0808_IE_OSMO_OSMUX_CID); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 278 | struct sockaddr_storage rtp_addr; |
Neels Hofmeyr | 8a50cfb | 2019-10-21 03:01:00 +0200 | [diff] [blame] | 279 | struct gsm0808_speech_codec_list codec_list_bss_supported; |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 280 | int rc; |
| 281 | struct ran_msg ran_dec_msg = { |
| 282 | .msg_type = RAN_MSG_ASSIGNMENT_COMPLETE, |
| 283 | .msg_name = "BSSMAP Assignment Complete", |
| 284 | }; |
| 285 | |
| 286 | if (ie_aoip_transp_addr) { |
| 287 | /* Decode AoIP transport address element */ |
| 288 | rc = gsm0808_dec_aoip_trasp_addr(&rtp_addr, ie_aoip_transp_addr->val, ie_aoip_transp_addr->len); |
| 289 | if (rc < 0) { |
| 290 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Unable to decode AoIP Transport Layer Address\n"); |
| 291 | return -EINVAL; |
| 292 | } |
| 293 | |
Pau Espin Pedrol | f9c76e3 | 2020-09-02 19:25:55 +0200 | [diff] [blame] | 294 | if (osmo_sockaddr_str_from_sockaddr(&ran_dec_msg.assignment_complete.remote_rtp, &rtp_addr)) { |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 295 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Assignment Complete: unable to decode remote RTP IP address\n"); |
| 296 | return -EINVAL; |
| 297 | } |
| 298 | } |
| 299 | |
Pau Espin Pedrol | a3cdab4 | 2019-05-09 17:54:08 +0200 | [diff] [blame] | 300 | if (ie_osmux_cid) { |
| 301 | rc = gsm0808_dec_osmux_cid(&ran_dec_msg.assignment_complete.osmux_cid, ie_osmux_cid->val, ie_osmux_cid->len); |
| 302 | if (rc < 0) { |
| 303 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Unable to decode Osmux CID\n"); |
| 304 | return -EINVAL; |
| 305 | } |
| 306 | ran_dec_msg.assignment_complete.osmux_present = true; |
| 307 | } |
| 308 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 309 | if (ie_speech_codec) { |
| 310 | /* Decode Speech Codec (Chosen) element */ |
Neels Hofmeyr | cec51b3 | 2023-03-01 03:47:45 +0100 | [diff] [blame] | 311 | rc = gsm0808_dec_speech_codec(&ran_dec_msg.assignment_complete.codec, |
| 312 | ie_speech_codec->val, ie_speech_codec->len); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 313 | if (rc < 0) { |
| 314 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Assignment Complete: unable to decode IE Speech Codec (Chosen)" |
| 315 | " (rc=%d).\n", rc); |
| 316 | return -EINVAL; |
| 317 | } |
| 318 | ran_dec_msg.assignment_complete.codec_present = true; |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 319 | } |
| 320 | |
Neels Hofmeyr | 8a50cfb | 2019-10-21 03:01:00 +0200 | [diff] [blame] | 321 | if (ie_codec_list_bss_supported) { |
| 322 | /* Decode Codec List (BSS Supported) */ |
| 323 | rc = gsm0808_dec_speech_codec_list(&codec_list_bss_supported, |
| 324 | ie_codec_list_bss_supported->val, ie_codec_list_bss_supported->len); |
| 325 | if (rc < 0) { |
| 326 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, |
| 327 | "Assignment Complete: unable to decode IE Codec List (BSS Supported)" |
| 328 | " (rc=%d), continuing anyway\n", rc); |
| 329 | /* This IE is not critical, do not abort with error. */ |
| 330 | } else |
| 331 | ran_dec_msg.assignment_complete.codec_list_bss_supported = &codec_list_bss_supported; |
| 332 | } |
| 333 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 334 | return ran_decoded(ran_dec, &ran_dec_msg); |
| 335 | } |
| 336 | |
| 337 | static int ran_a_decode_assignment_failure(struct ran_dec *ran_dec, struct msgb *msg, struct tlv_parsed *tp) |
| 338 | { |
| 339 | struct tlv_p_entry *ie_cause = TLVP_GET(tp, GSM0808_IE_CAUSE); |
| 340 | struct tlv_p_entry *ie_rr_cause = TLVP_GET(tp, GSM0808_IE_RR_CAUSE); |
| 341 | struct tlv_p_entry *ie_speech_codec_list = TLVP_GET(tp, GSM0808_IE_SPEECH_CODEC_LIST); |
| 342 | struct gsm0808_speech_codec_list scl; |
| 343 | struct ran_msg ran_dec_msg = { |
| 344 | .msg_type = RAN_MSG_ASSIGNMENT_FAILURE, |
| 345 | .msg_name = "BSSMAP Assignment Failure", |
| 346 | .assignment_failure = { |
| 347 | .bssap_cause = GSM0808_CAUSE_EQUIPMENT_FAILURE, |
| 348 | .rr_cause = GSM48_RR_CAUSE_ABNORMAL_UNSPEC, |
| 349 | }, |
| 350 | }; |
| 351 | |
| 352 | if (ie_cause) |
| 353 | ran_dec_msg.assignment_failure.bssap_cause = ie_cause->val[0]; |
| 354 | if (ie_rr_cause) |
| 355 | ran_dec_msg.assignment_failure.rr_cause = ie_rr_cause->val[0]; |
| 356 | |
| 357 | if (ie_speech_codec_list |
| 358 | && gsm0808_dec_speech_codec_list(&scl, ie_speech_codec_list->val, ie_speech_codec_list->len) == 0) |
| 359 | ran_dec_msg.assignment_failure.scl_bss_supported = &scl; |
| 360 | |
| 361 | return ran_decoded(ran_dec, &ran_dec_msg); |
| 362 | } |
| 363 | |
| 364 | static int ran_a_decode_sapi_n_reject(struct ran_dec *ran_dec, struct msgb *msg, struct tlv_parsed *tp) |
| 365 | { |
| 366 | struct tlv_p_entry *ie_cause = TLVP_GET(tp, GSM0808_IE_CAUSE); |
| 367 | struct tlv_p_entry *ie_dlci = TLVP_GET(tp, GSM0808_IE_DLCI); |
| 368 | struct ran_msg ran_dec_msg = { |
| 369 | .msg_type = RAN_MSG_SAPI_N_REJECT, |
| 370 | .msg_name = "BSSMAP SAPI-N Reject", |
| 371 | }; |
| 372 | |
| 373 | /* Note: The MSC code seems not to care about the cause code, but by |
| 374 | * the specification it is mandatory, so we check its presence. See |
| 375 | * also 3GPP TS 48.008 3.2.1.34 SAPI "n" REJECT */ |
| 376 | if (!ie_cause) { |
| 377 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "SAPI-N Reject: cause code IE is missing, discarding message\n"); |
| 378 | return -EINVAL; |
| 379 | } |
| 380 | ran_dec_msg.sapi_n_reject.bssap_cause = ie_cause->val[0]; |
| 381 | |
| 382 | if (!ie_dlci) { |
| 383 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "SAPI-N Reject: DLCI IE is missing, discarding message\n"); |
| 384 | return -EINVAL; |
| 385 | } |
| 386 | ran_dec_msg.sapi_n_reject.dlci = ie_dlci->val[0]; |
| 387 | |
| 388 | return ran_decoded(ran_dec, &ran_dec_msg); |
| 389 | } |
| 390 | |
| 391 | static int ran_a_decode_lcls_notification(struct ran_dec *ran_dec, const struct msgb *msg, const struct tlv_parsed *tp) |
| 392 | { |
| 393 | const struct tlv_p_entry *ie_lcls_bss_status = TLVP_GET(tp, GSM0808_IE_LCLS_BSS_STATUS); |
| 394 | const struct tlv_p_entry *ie_lcls_break_req = TLVP_GET(tp, GSM0808_IE_LCLS_BREAK_REQ); |
| 395 | struct ran_msg ran_dec_msg; |
| 396 | |
| 397 | /* Either §3.2.2.119 LCLS-BSS-Status or §3.2.2.120 LCLS-Break-Request shall be present */ |
Vadim Yanitskiy | 18e8b39 | 2019-05-11 04:22:55 +0700 | [diff] [blame] | 398 | if (ie_lcls_bss_status && !ie_lcls_break_req) { |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 399 | ran_dec_msg = (struct ran_msg){ |
| 400 | .msg_type = RAN_MSG_LCLS_STATUS, |
| 401 | .msg_name = "BSSMAP LCLS Notification (LCLS Status)", |
| 402 | .lcls_status = { |
| 403 | .status = ie_lcls_bss_status->len ? |
| 404 | ie_lcls_bss_status->val[0] : GSM0808_LCLS_STS_NA, |
| 405 | }, |
| 406 | }; |
| 407 | return ran_decoded(ran_dec, &ran_dec_msg); |
Vadim Yanitskiy | 18e8b39 | 2019-05-11 04:22:55 +0700 | [diff] [blame] | 408 | } else if (ie_lcls_break_req && !ie_lcls_bss_status) { |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 409 | ran_dec_msg = (struct ran_msg){ |
| 410 | .msg_type = RAN_MSG_LCLS_BREAK_REQ, |
| 411 | .msg_name = "BSSMAP LCLS Notification (LCLS Break Req)", |
| 412 | .lcls_break_req = { |
| 413 | .todo = 23, |
| 414 | }, |
| 415 | }; |
| 416 | return ran_decoded(ran_dec, &ran_dec_msg); |
| 417 | } |
| 418 | |
Vadim Yanitskiy | 18e8b39 | 2019-05-11 04:22:55 +0700 | [diff] [blame] | 419 | LOG_RAN_A_DEC(ran_dec, LOGL_ERROR, "Ignoring broken LCLS Notification message\n"); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 420 | return -EINVAL; |
| 421 | } |
| 422 | |
| 423 | static int ran_a_decode_handover_required(struct ran_dec *ran_dec, const struct msgb *msg, const struct tlv_parsed *tp) |
| 424 | { |
| 425 | const struct tlv_p_entry *ie_cause = TLVP_GET(tp, GSM0808_IE_CAUSE); |
| 426 | const struct tlv_p_entry *ie_cil = TLVP_GET(tp, GSM0808_IE_CELL_IDENTIFIER_LIST); |
| 427 | struct ran_msg ran_dec_msg = { |
| 428 | .msg_type = RAN_MSG_HANDOVER_REQUIRED, |
| 429 | .msg_name = "BSSMAP Handover Required", |
| 430 | }; |
| 431 | /* On decoding failures, dispatch an invalid RAN_MSG_HANDOVER_REQUIRED so msc_a can pass down a |
| 432 | * BSS_MAP_MSG_HANDOVER_REQUIRED_REJECT message. */ |
| 433 | |
| 434 | if (ie_cause) |
| 435 | ran_dec_msg.handover_required.cause = ie_cause->val[0]; |
| 436 | else |
| 437 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Cause IE missing\n"); |
| 438 | |
| 439 | if (!ie_cil |
| 440 | || gsm0808_dec_cell_id_list2(&ran_dec_msg.handover_required.cil, ie_cil->val, ie_cil->len) <= 0) { |
| 441 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "No or invalid Cell Identifier List IE\n"); |
| 442 | ran_dec_msg.handover_required.cil = (struct gsm0808_cell_id_list2){}; |
| 443 | } |
| 444 | |
| 445 | return ran_decoded(ran_dec, &ran_dec_msg); |
| 446 | } |
| 447 | |
| 448 | static uint8_t a5_encryption_mask_from_gsm0808_chosen_enc_alg(enum gsm0808_chosen_enc_alg val) |
| 449 | { |
| 450 | return 1 << val; |
| 451 | } |
| 452 | |
| 453 | static int ran_a_decode_handover_request(struct ran_dec *ran_dec, const struct msgb *msg, const struct tlv_parsed *tp) |
| 454 | { |
| 455 | struct osmo_gsm48_classmark classmark = {}; |
| 456 | struct ran_msg ran_dec_msg = { |
| 457 | .msg_type = RAN_MSG_HANDOVER_REQUEST, |
| 458 | .msg_name = "BSSMAP Handover Request", |
| 459 | .handover_request = { |
| 460 | .classmark = &classmark, |
| 461 | }, |
| 462 | }; |
| 463 | struct ran_handover_request *r = &ran_dec_msg.handover_request; |
| 464 | |
| 465 | const struct tlv_p_entry *ie_channel_type = TLVP_GET(tp, GSM0808_IE_CHANNEL_TYPE); |
| 466 | const struct tlv_p_entry *ie_encryption_information = TLVP_GET(tp, GSM0808_IE_ENCRYPTION_INFORMATION); |
| 467 | const struct tlv_p_entry *ie_classmark1 = TLVP_GET(tp, GSM0808_IE_CLASSMARK_INFORMATION_TYPE_1); |
| 468 | const struct tlv_p_entry *ie_classmark2 = TLVP_GET(tp, GSM0808_IE_CLASSMARK_INFORMATION_T2); |
| 469 | const struct tlv_p_entry *ie_cell_id_serving = TLVP_GET(&tp[0], GSM0808_IE_CELL_IDENTIFIER); |
| 470 | const struct tlv_p_entry *ie_cell_id_target = TLVP_GET(&tp[1], GSM0808_IE_CELL_IDENTIFIER); |
| 471 | const struct tlv_p_entry *ie_cause = TLVP_GET(tp, GSM0808_IE_CAUSE); |
| 472 | const struct tlv_p_entry *ie_classmark3 = TLVP_GET(tp, GSM0808_IE_CLASSMARK_INFORMATION_T3); |
| 473 | const struct tlv_p_entry *ie_current_channel_type_1 = TLVP_GET(tp, GSM0808_IE_CURRENT_CHANNEL_TYPE_1); |
| 474 | const struct tlv_p_entry *ie_speech_version_used = TLVP_GET(tp, GSM0808_IE_SPEECH_VERSION); |
| 475 | const struct tlv_p_entry *ie_chosen_encr_alg_serving = TLVP_GET(tp, GSM0808_IE_CHOSEN_ENCR_ALG); |
| 476 | const struct tlv_p_entry *ie_old_bss_to_new_bss_info = TLVP_GET(tp, GSM0808_IE_OLD_BSS_TO_NEW_BSS_INFORMATION); |
| 477 | const struct tlv_p_entry *ie_imsi = TLVP_GET(tp, GSM0808_IE_IMSI); |
| 478 | const struct tlv_p_entry *ie_aoip_transp_addr = TLVP_GET(tp, GSM0808_IE_AOIP_TRASP_ADDR); |
| 479 | const struct tlv_p_entry *ie_codec_list_msc_preferred = TLVP_GET(tp, GSM0808_IE_SPEECH_CODEC_LIST); |
| 480 | const struct tlv_p_entry *ie_call_id = TLVP_GET(tp, GSM0808_IE_CALL_ID); |
Neels Hofmeyr | db07fdc | 2021-06-09 22:27:47 +0200 | [diff] [blame] | 481 | const struct tlv_p_entry *ie_kc128 = TLVP_GET(tp, GSM0808_IE_KC_128); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 482 | const struct tlv_p_entry *ie_global_call_ref = TLVP_GET(tp, GSM0808_IE_GLOBAL_CALL_REF); |
| 483 | |
| 484 | struct gsm0808_channel_type channel_type; |
| 485 | struct gsm0808_encrypt_info encr_info; |
| 486 | struct gsm0808_speech_codec_list scl; |
| 487 | struct geran_encr geran_encr = {}; |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 488 | struct osmo_sockaddr_str rtp_ran_local; |
| 489 | |
| 490 | if (!ie_channel_type) { |
| 491 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Mandatory IE missing: Channel Type\n"); |
| 492 | return -EINVAL; |
| 493 | } |
| 494 | if (gsm0808_dec_channel_type(&channel_type, ie_channel_type->val, ie_channel_type->len) <= 0) { |
| 495 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Failed to decode Channel Type IE\n"); |
| 496 | return -EINVAL; |
| 497 | } |
| 498 | r->geran.channel_type = &channel_type; |
| 499 | |
| 500 | if (ie_encryption_information) { |
| 501 | int i; |
| 502 | if (gsm0808_dec_encrypt_info(&encr_info, ie_encryption_information->val, ie_encryption_information->len) |
| 503 | <= 0) { |
Martin Hauke | 3f07dac | 2019-11-14 17:49:08 +0100 | [diff] [blame] | 504 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Failed to decode Encryption Information IE\n"); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 505 | return -EINVAL; |
| 506 | } |
| 507 | |
| 508 | for (i = 0; i < encr_info.perm_algo_len; i++) { |
| 509 | r->geran.a5_encryption_mask |= |
| 510 | a5_encryption_mask_from_gsm0808_chosen_enc_alg(encr_info.perm_algo[i]); |
| 511 | } |
| 512 | |
| 513 | if (encr_info.key_len > sizeof(geran_encr.key)) { |
Martin Hauke | 3f07dac | 2019-11-14 17:49:08 +0100 | [diff] [blame] | 514 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Failed to decode Encryption Information IE:" |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 515 | " encryption key is too long: %u\n", geran_encr.key_len); |
| 516 | return -EINVAL; |
| 517 | } |
| 518 | |
| 519 | if (encr_info.key_len) { |
| 520 | memcpy(geran_encr.key, encr_info.key, encr_info.key_len); |
| 521 | geran_encr.key_len = encr_info.key_len; |
| 522 | } |
| 523 | |
Neels Hofmeyr | db07fdc | 2021-06-09 22:27:47 +0200 | [diff] [blame] | 524 | if (ie_kc128) { |
| 525 | memcpy(geran_encr.kc128, ie_kc128->val, 16); |
| 526 | geran_encr.kc128_present = true; |
| 527 | } |
| 528 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 529 | r->geran.chosen_encryption = &geran_encr; |
| 530 | } |
| 531 | |
| 532 | if (!ie_classmark1 && !ie_classmark2) { |
| 533 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Mandatory IE missing: either Classmark Information 1" |
| 534 | " or Classmark Information 2 must be included\n"); |
| 535 | return -EINVAL; |
| 536 | } |
| 537 | |
| 538 | if (ie_classmark1) { |
| 539 | if (ie_classmark1->len != sizeof(classmark.classmark1)) { |
| 540 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Invalid size for Classmark 1: %u, expected %zu\n", |
| 541 | ie_classmark1->len, sizeof(classmark.classmark1)); |
| 542 | return -EINVAL; |
| 543 | } |
| 544 | memcpy((uint8_t*)&classmark.classmark1, ie_classmark1->val, ie_classmark1->len); |
| 545 | classmark.classmark1_set = true; |
| 546 | } |
| 547 | |
| 548 | if (ie_classmark2) { |
| 549 | uint8_t len = OSMO_MIN(ie_classmark2->len, sizeof(classmark.classmark2)); |
| 550 | memcpy((uint8_t*)&classmark.classmark2, ie_classmark2->val, len); |
| 551 | classmark.classmark2_len = len; |
| 552 | } |
| 553 | |
| 554 | if (!ie_cell_id_serving) { |
| 555 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Mandatory IE missing: Cell Identifier (Serving)\n"); |
| 556 | return -EINVAL; |
| 557 | } |
| 558 | if (gsm0808_dec_cell_id(&r->cell_id_serving, ie_cell_id_serving->val, |
| 559 | ie_cell_id_serving->len) <= 0) { |
| 560 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Failed to decode Cell Identifier (Serving) IE\n"); |
| 561 | return -EINVAL; |
| 562 | } |
| 563 | |
| 564 | if (!ie_cell_id_target) { |
| 565 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Mandatory IE missing: Cell Identifier (Target)\n"); |
| 566 | return -EINVAL; |
| 567 | } |
| 568 | if (gsm0808_dec_cell_id(&r->cell_id_target, ie_cell_id_target->val, |
| 569 | ie_cell_id_target->len) <= 0) { |
| 570 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Failed to decode Cell Identifier (Target) IE\n"); |
| 571 | return -EINVAL; |
| 572 | } |
| 573 | |
| 574 | if (ie_cause) |
| 575 | r->bssap_cause = ie_cause->val[0]; |
| 576 | |
| 577 | if (ie_classmark3) { |
| 578 | uint8_t len = OSMO_MIN(ie_classmark3->len, sizeof(classmark.classmark3)); |
| 579 | memcpy(classmark.classmark3, ie_classmark3->val, len); |
| 580 | classmark.classmark3_len = len; |
| 581 | } |
| 582 | |
| 583 | if (ie_current_channel_type_1) { |
| 584 | r->current_channel_type_1 = ie_current_channel_type_1->val[0]; |
| 585 | r->current_channel_type_1_present = true; |
| 586 | } |
| 587 | |
| 588 | if (ie_speech_version_used) { |
| 589 | r->speech_version_used = ie_speech_version_used->val[0]; |
| 590 | } |
| 591 | |
| 592 | if (ie_chosen_encr_alg_serving && ie_chosen_encr_alg_serving->len) { |
| 593 | geran_encr.alg_id = ie_chosen_encr_alg_serving->val[0]; |
| 594 | r->geran.chosen_encryption = &geran_encr; |
| 595 | } |
| 596 | |
| 597 | if (ie_old_bss_to_new_bss_info) { |
| 598 | r->old_bss_to_new_bss_info_raw = ie_old_bss_to_new_bss_info->val; |
| 599 | r->old_bss_to_new_bss_info_raw_len = ie_old_bss_to_new_bss_info->len; |
| 600 | } |
| 601 | |
| 602 | if (ie_imsi) { |
Neels Hofmeyr | 46d526a | 2020-05-29 03:27:50 +0200 | [diff] [blame] | 603 | struct osmo_mobile_identity mi; |
| 604 | if (osmo_mobile_identity_decode(&mi, ie_imsi->val, ie_imsi->len, false) |
| 605 | || mi.type != GSM_MI_TYPE_IMSI) |
| 606 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "IE IMSI: cannot decode IMSI identity\n"); |
| 607 | else |
| 608 | r->imsi = mi.imsi; |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 609 | } |
| 610 | |
| 611 | if (ie_aoip_transp_addr) { |
Pau Espin Pedrol | 0632717 | 2020-09-04 16:37:14 +0200 | [diff] [blame] | 612 | struct sockaddr_storage rtp_addr; |
| 613 | if (gsm0808_dec_aoip_trasp_addr(&rtp_addr, ie_aoip_transp_addr->val, ie_aoip_transp_addr->len) < 0) |
| 614 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "unable to decode AoIP transport address\n"); |
| 615 | else if (osmo_sockaddr_str_from_sockaddr(&rtp_ran_local, &rtp_addr) < 0) |
| 616 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "unable to decode remote RTP IP address\n"); |
| 617 | else |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 618 | r->rtp_ran_local = &rtp_ran_local; |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 619 | } |
| 620 | |
| 621 | if (ie_codec_list_msc_preferred |
| 622 | && gsm0808_dec_speech_codec_list(&scl, ie_codec_list_msc_preferred->val, |
| 623 | ie_codec_list_msc_preferred->len) == 0) |
| 624 | r->codec_list_msc_preferred = &scl; |
| 625 | |
| 626 | if (ie_call_id && ie_call_id->len == 4) { |
| 627 | r->call_id = osmo_load32le(ie_call_id->val); |
| 628 | r->call_id_present = true; |
| 629 | } |
| 630 | |
| 631 | if (ie_global_call_ref) { |
| 632 | r->global_call_reference = ie_global_call_ref->val; |
| 633 | r->global_call_reference_len = ie_global_call_ref->len; |
| 634 | } |
| 635 | |
| 636 | return ran_decoded(ran_dec, &ran_dec_msg); |
| 637 | } |
| 638 | |
| 639 | static int ran_a_decode_handover_request_ack(struct ran_dec *ran_dec, const struct msgb *msg, const struct tlv_parsed *tp) |
| 640 | { |
| 641 | struct ran_msg ran_dec_msg = { |
| 642 | .msg_type = RAN_MSG_HANDOVER_REQUEST_ACK, |
| 643 | .msg_name = "BSSMAP Handover Request Acknowledge", |
| 644 | }; |
| 645 | const struct tlv_p_entry *ie_l3_info = TLVP_GET(tp, GSM0808_IE_LAYER_3_INFORMATION); |
| 646 | const struct tlv_p_entry *ie_aoip_transp_addr = TLVP_GET(tp, GSM0808_IE_AOIP_TRASP_ADDR); |
| 647 | const struct tlv_p_entry *ie_speech_codec = TLVP_GET(tp, GSM0808_IE_SPEECH_CODEC); |
| 648 | const struct tlv_p_entry *ie_chosen_channel = TLVP_GET(tp, GSM0808_IE_CHOSEN_CHANNEL); |
| 649 | const struct tlv_p_entry *ie_chosen_encr_alg = TLVP_GET(tp, GSM0808_IE_CHOSEN_ENCR_ALG); |
| 650 | const struct tlv_p_entry *ie_chosen_speech_version = TLVP_GET(tp, GSM0808_IE_SPEECH_VERSION); |
| 651 | |
| 652 | /* On missing mandatory IEs, dispatch an invalid RAN_MSG_HANDOVER_REQUEST_ACK so msc_a can act on the failure. */ |
| 653 | |
| 654 | if (ie_l3_info) { |
| 655 | ran_dec_msg.handover_request_ack.rr_ho_command = ie_l3_info->val; |
| 656 | ran_dec_msg.handover_request_ack.rr_ho_command_len = ie_l3_info->len; |
| 657 | } |
| 658 | |
| 659 | if (ie_chosen_channel) { |
| 660 | ran_dec_msg.handover_request_ack.chosen_channel_present = true; |
| 661 | ran_dec_msg.handover_request_ack.chosen_channel = *ie_chosen_channel->val; |
| 662 | } |
| 663 | |
| 664 | if (ie_chosen_encr_alg) { |
| 665 | ran_dec_msg.handover_request_ack.chosen_encr_alg = *ie_chosen_encr_alg->val; |
| 666 | if (ran_dec_msg.handover_request_ack.chosen_encr_alg < 1 |
| 667 | || ran_dec_msg.handover_request_ack.chosen_encr_alg > 8) { |
| 668 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "invalid Chosen Encryption Algorithm: %u\n", |
| 669 | ran_dec_msg.handover_request_ack.chosen_encr_alg); |
| 670 | } |
| 671 | } |
| 672 | |
| 673 | if (ie_chosen_speech_version) { |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 674 | ran_dec_msg.handover_request_ack.chosen_speech_version = ie_chosen_speech_version->val[0]; |
| 675 | |
| 676 | /* the codec may be extrapolated from this Speech Version or below from Speech Codec */ |
Neels Hofmeyr | 7934e0d | 2022-10-31 18:13:47 +0100 | [diff] [blame] | 677 | if (gsm0808_speech_codec_from_chan_type(&ran_dec_msg.handover_request_ack.codec, |
| 678 | ran_dec_msg.handover_request_ack.chosen_speech_version) == 0) |
| 679 | ran_dec_msg.handover_request_ack.codec_present = true; |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 680 | } |
| 681 | |
| 682 | if (ie_aoip_transp_addr) { |
Pau Espin Pedrol | 0632717 | 2020-09-04 16:37:14 +0200 | [diff] [blame] | 683 | struct sockaddr_storage rtp_addr; |
| 684 | if (gsm0808_dec_aoip_trasp_addr(&rtp_addr, ie_aoip_transp_addr->val, ie_aoip_transp_addr->len) < 0) { |
| 685 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "unable to decode AoIP transport address\n"); |
| 686 | } else if (osmo_sockaddr_str_from_sockaddr(&ran_dec_msg.handover_request_ack.remote_rtp, |
| 687 | &rtp_addr)) { |
| 688 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "unable to decode remote RTP IP address\n"); |
| 689 | ran_dec_msg.handover_request_ack.remote_rtp = (struct osmo_sockaddr_str){}; |
| 690 | } |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 691 | } |
| 692 | |
| 693 | if (ie_speech_codec) { |
Neels Hofmeyr | 7934e0d | 2022-10-31 18:13:47 +0100 | [diff] [blame] | 694 | /* the codec may be extrapolated from above Speech Version or from this Speech Codec */ |
| 695 | if (gsm0808_dec_speech_codec(&ran_dec_msg.handover_request_ack.codec, |
| 696 | ie_speech_codec->val, ie_speech_codec->len) < 0) |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 697 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "unable to decode IE Speech Codec (Chosen)\n"); |
Neels Hofmeyr | 7934e0d | 2022-10-31 18:13:47 +0100 | [diff] [blame] | 698 | else |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 699 | ran_dec_msg.handover_request_ack.codec_present = true; |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 700 | } |
| 701 | |
| 702 | return ran_decoded(ran_dec, &ran_dec_msg); |
| 703 | } |
| 704 | |
| 705 | static int ran_a_decode_handover_detect(struct ran_dec *ran_dec, const struct msgb *msg, const struct tlv_parsed *tp) |
| 706 | { |
| 707 | struct ran_msg ran_dec_msg = { |
| 708 | .msg_type = RAN_MSG_HANDOVER_DETECT, |
| 709 | .msg_name = "BSSMAP Handover Detect", |
| 710 | }; |
| 711 | |
| 712 | return ran_decoded(ran_dec, &ran_dec_msg); |
| 713 | } |
| 714 | |
| 715 | static int ran_a_decode_handover_succeeded(struct ran_dec *ran_dec, const struct msgb *msg, const struct tlv_parsed *tp) |
| 716 | { |
| 717 | struct ran_msg ran_dec_msg = { |
| 718 | .msg_type = RAN_MSG_HANDOVER_SUCCEEDED, |
| 719 | .msg_name = "BSSMAP Handover Succeeded", |
| 720 | }; |
| 721 | |
| 722 | return ran_decoded(ran_dec, &ran_dec_msg); |
| 723 | } |
| 724 | |
| 725 | static int ran_a_decode_handover_complete(struct ran_dec *ran_dec, const struct msgb *msg, const struct tlv_parsed *tp) |
| 726 | { |
| 727 | struct ran_msg ran_dec_msg = { |
| 728 | .msg_type = RAN_MSG_HANDOVER_COMPLETE, |
| 729 | .msg_name = "BSSMAP Handover Complete", |
| 730 | }; |
| 731 | |
| 732 | return ran_decoded(ran_dec, &ran_dec_msg); |
| 733 | } |
| 734 | |
| 735 | static int ran_a_decode_handover_failure(struct ran_dec *ran_dec, const struct msgb *msg, const struct tlv_parsed *tp) |
| 736 | { |
| 737 | struct ran_msg ran_dec_msg = { |
| 738 | .msg_type = RAN_MSG_HANDOVER_FAILURE, |
| 739 | .msg_name = "BSSMAP Handover Failure", |
| 740 | }; |
| 741 | |
| 742 | return ran_decoded(ran_dec, &ran_dec_msg); |
| 743 | } |
| 744 | |
Andreas Eversberg | 2d27e2c | 2023-04-23 12:05:44 +0200 | [diff] [blame] | 745 | static int ran_a_decode_vgcs_vbs_setup_ack(struct ran_dec *ran_dec, const struct msgb *msg, const struct tlv_parsed *tp) |
| 746 | { |
| 747 | struct ran_msg ran_dec_msg = { |
| 748 | .msg_type = RAN_MSG_VGCS_VBS_SETUP_ACK, |
| 749 | .msg_name = "BSSMAP VGCS/VBS SETUP ACKNOWLEDGE", |
| 750 | }; |
| 751 | struct gsm0808_vgcs_vbs_setup_ack *r = &ran_dec_msg.vgcs_vbs_setup_ack; |
| 752 | int rc; |
| 753 | |
| 754 | const struct tlv_p_entry *ie_flags = TLVP_GET(tp, GSM0808_IE_VGCS_FEATURE_FLAGS); |
| 755 | |
| 756 | /* VGCS Feature Flags, 3.2.2.88 */ |
| 757 | if (ie_flags) { |
| 758 | rc = gsm0808_dec_vgcs_feature_flags(&r->flags, ie_flags->val, ie_flags->len); |
| 759 | if (rc < 0) { |
| 760 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Unable to decode VGCS/VBS Feature Flags\n"); |
| 761 | return -EINVAL; |
| 762 | } |
| 763 | r->vgcs_feature_flags_present = true; |
| 764 | } |
| 765 | |
| 766 | return ran_decoded(ran_dec, &ran_dec_msg); |
| 767 | } |
| 768 | |
| 769 | static int ran_a_decode_vgcs_vbs_setup_refuse(struct ran_dec *ran_dec, const struct msgb *msg, |
| 770 | const struct tlv_parsed *tp) |
| 771 | { |
| 772 | struct ran_msg ran_dec_msg = { |
| 773 | .msg_type = RAN_MSG_VGCS_VBS_SETUP_REFUSE, |
| 774 | .msg_name = "BSSMAP VGCS/VBS SETUP REFUSE", |
| 775 | }; |
| 776 | |
| 777 | const struct tlv_p_entry *ie_cause = TLVP_GET(tp, GSM0808_IE_CAUSE); |
| 778 | |
| 779 | /* Cause, 3.2.2.5 */ |
| 780 | if (!ie_cause || ie_cause->len < 1) { |
| 781 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Mandatory IE missing: Cause\n"); |
| 782 | return -EINVAL; |
| 783 | } |
| 784 | ran_dec_msg.vgcs_vbs_setup_refuse.cause = ie_cause->val[0]; |
| 785 | |
| 786 | return ran_decoded(ran_dec, &ran_dec_msg); |
| 787 | } |
| 788 | |
| 789 | static int ran_a_decode_vgcs_vbs_assign_res(struct ran_dec *ran_dec, const struct msgb *msg, |
| 790 | const struct tlv_parsed *tp) |
| 791 | { |
| 792 | struct ran_msg ran_dec_msg = { |
| 793 | .msg_type = RAN_MSG_VGCS_VBS_ASSIGN_RES, |
| 794 | .msg_name = "BSSMAP VGCS/VBS ASSIGNMENT RESULT", |
| 795 | }; |
| 796 | struct gsm0808_vgcs_vbs_assign_res *r = &ran_dec_msg.vgcs_vbs_assign_res; |
| 797 | int rc; |
| 798 | |
| 799 | const struct tlv_p_entry *ie_channel_type = TLVP_GET(tp, GSM0808_IE_CHANNEL_TYPE); |
| 800 | const struct tlv_p_entry *ie_cell_id = TLVP_GET(tp, GSM0808_IE_CELL_IDENTIFIER); |
| 801 | const struct tlv_p_entry *ie_chosen_channel = TLVP_GET(tp, GSM0808_IE_CHOSEN_CHANNEL); |
| 802 | const struct tlv_p_entry *ie_cic = TLVP_GET(tp, GSM0808_IE_CIRCUIT_IDENTITY_CODE); |
| 803 | const struct tlv_p_entry *ie_circuit_pool = TLVP_GET(tp, GSM0808_IE_CIRCUIT_POOL); |
| 804 | const struct tlv_p_entry *ie_aoip = TLVP_GET(tp, GSM0808_IE_AOIP_TRASP_ADDR); |
| 805 | const struct tlv_p_entry *ie_call_id = TLVP_GET(tp, GSM0808_IE_CALL_ID); |
| 806 | |
| 807 | /* Channel Type, 3.2.2.11 */ |
| 808 | if (!ie_channel_type) { |
| 809 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Mandatory IE missing: Channel Type\n"); |
| 810 | return -EINVAL; |
| 811 | } |
| 812 | if (gsm0808_dec_channel_type(&r->channel_type, ie_channel_type->val, ie_channel_type->len) <= 0) { |
| 813 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Failed to decode Channel Type IE\n"); |
| 814 | return -EINVAL; |
| 815 | } |
| 816 | |
| 817 | /* Cell Identifier, 3.2.2.17 */ |
| 818 | if (!ie_cell_id) { |
| 819 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Mandatory IE missing: Cell Identifier\n"); |
| 820 | return -EINVAL; |
| 821 | } |
| 822 | rc = gsm0808_dec_cell_id(&r->cell_identifier, ie_cell_id->val, ie_cell_id->len); |
| 823 | if (rc < 0) { |
| 824 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Decoding Cell Identifier gave rc=%d\n", rc); |
| 825 | return -EINVAL; |
| 826 | } |
| 827 | |
| 828 | /* Chosen Channel, 3.2.2.33 */ |
| 829 | if (ie_chosen_channel) { |
| 830 | r->chosen_channel = ie_chosen_channel->val[0]; |
| 831 | r->chosen_channel_present = true; |
| 832 | } |
| 833 | |
| 834 | /* Circuit Identity Code, 3.2.2.2 */ |
| 835 | if (ie_cic) { |
| 836 | if (ie_cic->len != 2) { |
| 837 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Circuit Identity Code has invalid length.\n"); |
| 838 | return -EINVAL; |
| 839 | } |
| 840 | r->cic = *(uint16_t *)ie_cic->val; |
| 841 | r->cic_present = true; |
| 842 | } |
| 843 | |
| 844 | /* Circuit Pool, 3.2.2.45 */ |
| 845 | if (ie_circuit_pool) { |
| 846 | r->circuit_pool = ie_circuit_pool->val[0]; |
| 847 | r->circuit_pool_present = true; |
| 848 | } |
| 849 | |
| 850 | /* AoIP Transport Layer Address (BSS), 3.2.2.102 */ |
| 851 | if (ie_aoip) { |
| 852 | if (gsm0808_dec_aoip_trasp_addr(&r->aoip_transport_layer, ie_aoip->val, ie_aoip->len) < 0) { |
| 853 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "unable to decode AoIP transport address\n"); |
| 854 | return -EINVAL; |
| 855 | } |
| 856 | r->aoip_transport_layer_present = true; |
| 857 | } |
| 858 | |
| 859 | if (ie_call_id) { |
| 860 | if (ie_call_id->len != 4) { |
| 861 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Call Identifier has invalid length.\n"); |
| 862 | return -EINVAL; |
| 863 | } |
| 864 | r->call_id = osmo_load32le(ie_call_id->val); |
| 865 | r->call_id_present = true; |
| 866 | } |
| 867 | |
| 868 | return ran_decoded(ran_dec, &ran_dec_msg); |
| 869 | } |
| 870 | |
| 871 | static int ran_a_decode_vgcs_vbs_assign_fail(struct ran_dec *ran_dec, const struct msgb *msg, |
| 872 | const struct tlv_parsed *tp) |
| 873 | { |
| 874 | struct ran_msg ran_dec_msg = { |
| 875 | .msg_type = RAN_MSG_VGCS_VBS_ASSIGN_FAIL, |
| 876 | .msg_name = "BSSMAP VGCS/VBS ASSIGNMENT FAILURE", |
| 877 | }; |
| 878 | struct gsm0808_vgcs_vbs_assign_fail *r = &ran_dec_msg.vgcs_vbs_assign_fail; |
| 879 | int rc; |
| 880 | |
| 881 | const struct tlv_p_entry *ie_cause = TLVP_GET(tp, GSM0808_IE_CAUSE); |
| 882 | const struct tlv_p_entry *ie_circuit_pool = TLVP_GET(tp, GSM0808_IE_CIRCUIT_POOL); |
| 883 | const struct tlv_p_entry *ie_circuit_pool_list = TLVP_GET(tp, GSM0808_IE_CIRCUIT_POOL_LIST); |
| 884 | const struct tlv_p_entry *ie_codec_list_bss_supported = TLVP_GET(tp, GSM0808_IE_SPEECH_CODEC_LIST); |
| 885 | |
| 886 | /* Cause, 3.2.2.5 */ |
| 887 | if (!ie_cause || ie_cause->len < 1) { |
| 888 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Mandatory IE missing: Cause\n"); |
| 889 | return -EINVAL; |
| 890 | } |
| 891 | r->cause = ie_cause->val[0]; |
| 892 | |
| 893 | /* Circuit Pool, 3.2.2.45 */ |
| 894 | if (ie_circuit_pool) { |
| 895 | r->circuit_pool = ie_circuit_pool->val[0]; |
| 896 | r->circuit_pool_present = true; |
| 897 | } |
| 898 | |
| 899 | /* Circuit Pool List, 3.2.2.46 */ |
| 900 | if (ie_circuit_pool_list && ie_circuit_pool_list->len) { |
| 901 | if (ie_circuit_pool_list->len > CIRCUIT_POOL_LIST_MAXLEN) { |
| 902 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Circuit Pool List has invalid length.\n"); |
| 903 | return -EINVAL; |
| 904 | } |
| 905 | memcpy(r->cpl.pool, ie_circuit_pool_list->val, ie_circuit_pool_list->len); |
| 906 | r->cpl.list_len = ie_circuit_pool_list->len; |
| 907 | r->cpl_present = true; |
| 908 | } |
| 909 | |
| 910 | /* Codec List (BSS Supported) 3.2.2.103 */ |
| 911 | if (ie_codec_list_bss_supported) { |
| 912 | rc = gsm0808_dec_speech_codec_list(&r->codec_list_bss_supported, |
| 913 | ie_codec_list_bss_supported->val, ie_codec_list_bss_supported->len); |
| 914 | if (rc < 0) { |
| 915 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, |
| 916 | "Complete Layer 3 Information: unable to decode IE Codec List (BSS Supported)" |
| 917 | " (rc=%d), continuing anyway\n", rc); |
| 918 | /* This IE is not critical, do not abort with error. */ |
| 919 | } else |
| 920 | r->codec_list_present = true; |
| 921 | } |
| 922 | |
| 923 | return ran_decoded(ran_dec, &ran_dec_msg); |
| 924 | } |
| 925 | |
| 926 | static int ran_a_decode_vgcs_vbs_queuing_ind(struct ran_dec *ran_dec, const struct msgb *msg, |
| 927 | const struct tlv_parsed *tp) |
| 928 | { |
| 929 | struct ran_msg ran_dec_msg = { |
| 930 | .msg_type = RAN_MSG_VGCS_VBS_QUEUING_IND, |
| 931 | .msg_name = "BSSMAP VGCS/VBS QUEUING INDICATION", |
| 932 | }; |
| 933 | |
| 934 | return ran_decoded(ran_dec, &ran_dec_msg); |
| 935 | } |
| 936 | |
| 937 | static int ran_a_decode_uplink_request(struct ran_dec *ran_dec, const struct msgb *msg, const struct tlv_parsed *tp) |
| 938 | { |
| 939 | struct ran_msg ran_dec_msg = { |
| 940 | .msg_type = RAN_MSG_UPLINK_REQUEST, |
| 941 | .msg_name = "BSSMAP UPLINK REQUEST", |
| 942 | }; |
| 943 | struct gsm0808_uplink_request *r = &ran_dec_msg.uplink_request; |
| 944 | int rc; |
| 945 | |
| 946 | const struct tlv_p_entry *ie_talker_priority = TLVP_GET(tp, GSM0808_IE_TALKER_PRIORITY); |
| 947 | const struct tlv_p_entry *ie_cell_id = TLVP_GET(tp, GSM0808_IE_CELL_IDENTIFIER); |
| 948 | const struct tlv_p_entry *ie_l3_info = TLVP_GET(tp, GSM0808_IE_LAYER_3_INFORMATION); |
| 949 | const struct tlv_p_entry *ie_mi = TLVP_GET(tp, GSM0808_IE_MOBILE_IDENTITY); |
| 950 | |
| 951 | /* Talker Priority, 3.2.2.89 */ |
| 952 | if (ie_talker_priority) { |
| 953 | r->talker_priority = ie_talker_priority->val[0] & 0x03; |
| 954 | r->talker_priority_present = true; |
| 955 | } |
| 956 | |
| 957 | /* Cell Identifier, 3.2.2.17 */ |
| 958 | if (ie_cell_id) { |
| 959 | rc = gsm0808_dec_cell_id(&r->cell_identifier, ie_cell_id->val, ie_cell_id->len); |
| 960 | if (rc < 0) { |
| 961 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Decoding Cell Identifier gave rc=%d\n", rc); |
| 962 | return -EINVAL; |
| 963 | } |
| 964 | } |
| 965 | |
| 966 | /* Layer 3 Information, 3.2.2.24 */ |
| 967 | if (ie_l3_info && ie_l3_info->len) { |
| 968 | if (ie_l3_info->len > LAYER_3_INFORMATION_MAXLEN) { |
| 969 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Call Identifier has invalid length.\n"); |
| 970 | return -EINVAL; |
| 971 | } |
| 972 | memcpy(r->l3.l3, ie_l3_info->val, ie_l3_info->len); |
| 973 | r->l3.l3_len = ie_l3_info->len; |
| 974 | r->l3_present = true; |
| 975 | } |
| 976 | |
| 977 | /* Mobile Identity, 3.2.2.41 */ |
| 978 | if (ie_mi) { |
Andreas Eversberg | cc72929 | 2023-07-19 09:41:58 +0200 | [diff] [blame] | 979 | rc = osmo_mobile_identity_decode(&r->mi, ie_mi->val, ie_mi->len, false); |
| 980 | if (rc < 0) { |
Andreas Eversberg | 2d27e2c | 2023-04-23 12:05:44 +0200 | [diff] [blame] | 981 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Decoding Mobile Identity gave rc=%d\n", rc); |
| 982 | return -EINVAL; |
| 983 | } |
| 984 | r->mi_present = true; |
| 985 | } |
| 986 | |
| 987 | return ran_decoded(ran_dec, &ran_dec_msg); |
| 988 | } |
| 989 | |
| 990 | static int ran_a_decode_uplink_request_cnf(struct ran_dec *ran_dec, const struct msgb *msg, const struct tlv_parsed *tp) |
| 991 | { |
| 992 | struct ran_msg ran_dec_msg = { |
| 993 | .msg_type = RAN_MSG_UPLINK_REQUEST_CNF, |
| 994 | .msg_name = "BSSMAP UPLINK REQUEST CONFIRM", |
| 995 | }; |
| 996 | struct gsm0808_uplink_request_cnf *r = &ran_dec_msg.uplink_request_cnf; |
| 997 | int rc; |
| 998 | |
| 999 | const struct tlv_p_entry *ie_cell_id = TLVP_GET(tp, GSM0808_IE_CELL_IDENTIFIER); |
| 1000 | const struct tlv_p_entry *ie_talker_identity = TLVP_GET(tp, GSM0808_IE_TALKER_IDENTITY); |
| 1001 | const struct tlv_p_entry *ie_l3_info = TLVP_GET(tp, GSM0808_IE_LAYER_3_INFORMATION); |
| 1002 | |
| 1003 | /* Cell Identifier, 3.2.2.17 */ |
| 1004 | if (!ie_cell_id) { |
| 1005 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Mandatory IE missing: Cell Identifier\n"); |
| 1006 | return -EINVAL; |
| 1007 | } |
| 1008 | rc = gsm0808_dec_cell_id(&r->cell_identifier, ie_cell_id->val, ie_cell_id->len); |
| 1009 | if (rc < 0) { |
| 1010 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Decoding Cell Identifier gave rc=%d\n", rc); |
| 1011 | return -EINVAL; |
| 1012 | } |
| 1013 | |
| 1014 | /* Talker Identity, 3.2.2.91 */ |
| 1015 | if (ie_talker_identity) { |
| 1016 | rc = gsm0808_dec_talker_identity(&r->talker_identity, ie_talker_identity->val, ie_talker_identity->len); |
| 1017 | if (rc < 0) { |
| 1018 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Decoding Talker Identity gave rc=%d\n", rc); |
| 1019 | return -EINVAL; |
| 1020 | } |
| 1021 | r->talker_identity_present = true; |
| 1022 | } |
| 1023 | |
| 1024 | /* Layer 3 Information, 3.2.2.24 */ |
| 1025 | if (!ie_l3_info) { |
| 1026 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Mandatory IE missing: Layer 3 Information\n"); |
| 1027 | return -EINVAL; |
| 1028 | } |
| 1029 | if (ie_l3_info->len > LAYER_3_INFORMATION_MAXLEN) { |
| 1030 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Call Identifier has invalid length.\n"); |
| 1031 | return -EINVAL; |
| 1032 | } |
| 1033 | memcpy(r->l3.l3, ie_l3_info->val, ie_l3_info->len); |
| 1034 | r->l3.l3_len = ie_l3_info->len; |
| 1035 | |
| 1036 | return ran_decoded(ran_dec, &ran_dec_msg); |
| 1037 | } |
| 1038 | |
| 1039 | static int ran_a_decode_uplink_application_data(struct ran_dec *ran_dec, const struct msgb *msg, |
| 1040 | const struct tlv_parsed *tp) |
| 1041 | { |
| 1042 | struct ran_msg ran_dec_msg = { |
| 1043 | .msg_type = RAN_MSG_UPLINK_APPLICATION_DATA, |
| 1044 | .msg_name = "BSSMAP UPLINK APPLICATION DATA", |
| 1045 | }; |
| 1046 | struct gsm0808_uplink_app_data *r = &ran_dec_msg.uplink_app_data; |
| 1047 | int rc; |
| 1048 | |
| 1049 | const struct tlv_p_entry *ie_cell_id = TLVP_GET(tp, GSM0808_IE_CELL_IDENTIFIER); |
| 1050 | const struct tlv_p_entry *ie_l3_info = TLVP_GET(tp, GSM0808_IE_LAYER_3_INFORMATION); |
| 1051 | const struct tlv_p_entry *ie_app_data = TLVP_GET(tp, GSM0808_IE_APP_DATA); |
| 1052 | |
| 1053 | /* Cell Identifier, 3.2.2.17 */ |
| 1054 | if (!ie_cell_id) { |
| 1055 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Mandatory IE missing: Cell Identifier\n"); |
| 1056 | return -EINVAL; |
| 1057 | } |
| 1058 | rc = gsm0808_dec_cell_id(&r->cell_identifier, ie_cell_id->val, ie_cell_id->len); |
| 1059 | if (rc < 0) { |
| 1060 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Decoding Cell Identifier gave rc=%d\n", rc); |
| 1061 | return -EINVAL; |
| 1062 | } |
| 1063 | |
| 1064 | /* Layer 3 Information, 3.2.2.24 */ |
| 1065 | if (!ie_l3_info) { |
| 1066 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Mandatory IE missing: Layer 3 Information\n"); |
| 1067 | return -EINVAL; |
| 1068 | } |
| 1069 | if (ie_l3_info->len > LAYER_3_INFORMATION_MAXLEN) { |
| 1070 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Call Identifier has invalid length.\n"); |
| 1071 | return -EINVAL; |
| 1072 | } |
| 1073 | memcpy(r->l3.l3, ie_l3_info->val, ie_l3_info->len); |
| 1074 | r->l3.l3_len = ie_l3_info->len; |
| 1075 | |
| 1076 | /* Application Data Information, 3.2.2.100 */ |
| 1077 | if (!ie_app_data || ie_app_data->len < 1) { |
| 1078 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Mandatory IE missing: Application Data Information\n"); |
| 1079 | return -EINVAL; |
| 1080 | } |
| 1081 | r->bt_ind = ie_app_data->val[0] & 0x01; |
| 1082 | |
| 1083 | return ran_decoded(ran_dec, &ran_dec_msg); |
| 1084 | } |
| 1085 | |
| 1086 | static int ran_a_decode_uplink_release_ind(struct ran_dec *ran_dec, const struct msgb *msg, const struct tlv_parsed *tp) |
| 1087 | { |
| 1088 | struct ran_msg ran_dec_msg = { |
| 1089 | .msg_type = RAN_MSG_UPLINK_RELEASE_IND, |
| 1090 | .msg_name = "BSSMAP UPLINK RELEASE INDICATION", |
| 1091 | }; |
| 1092 | struct gsm0808_uplink_release_ind *r = &ran_dec_msg.uplink_release_ind; |
| 1093 | |
| 1094 | const struct tlv_p_entry *ie_cause = TLVP_GET(tp, GSM0808_IE_CAUSE); |
| 1095 | const struct tlv_p_entry *ie_talker_priority = TLVP_GET(tp, GSM0808_IE_TALKER_PRIORITY); |
| 1096 | |
| 1097 | /* Cause, 3.2.2.5 */ |
| 1098 | if (!ie_cause || ie_cause->len < 1) { |
| 1099 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Mandatory IE missing: Cause\n"); |
| 1100 | return -EINVAL; |
| 1101 | } |
| 1102 | r->cause = ie_cause->val[0]; |
| 1103 | |
| 1104 | /* Talker Priority, 3.2.2.89 */ |
| 1105 | if (ie_talker_priority) { |
| 1106 | r->talker_priority = ie_talker_priority->val[0] & 0x03; |
| 1107 | r->talker_priority_present = true; |
| 1108 | } |
| 1109 | |
| 1110 | return ran_decoded(ran_dec, &ran_dec_msg); |
| 1111 | } |
| 1112 | |
| 1113 | static int ran_a_decode_vgcs_vbs_assign_status(struct ran_dec *ran_dec, const struct msgb *msg, |
| 1114 | const struct tlv_parsed *tp) |
| 1115 | { |
| 1116 | struct ran_msg ran_dec_msg = { |
| 1117 | .msg_type = RAN_MSG_VGCS_VBS_ASSIGN_STATUS, |
| 1118 | .msg_name = "BSSMAP VGCS/VBS ASSIGNMENT STATUS", |
| 1119 | }; |
| 1120 | struct gsm0808_vgcs_vbs_assign_stat *r = &ran_dec_msg.vgcs_vbs_assign_stat; |
| 1121 | int rc; |
| 1122 | |
| 1123 | const struct tlv_p_entry *ie_cils_est = TLVP_GET(tp, GSM0808_IE_CELL_ID_LIST_SEG_EST_CELLS); |
| 1124 | const struct tlv_p_entry *ie_cils_tbe = TLVP_GET(tp, GSM0808_IE_CELL_ID_LIST_SEG_CELLS_TBE); |
| 1125 | const struct tlv_p_entry *ie_cils_rel = TLVP_GET(tp, GSM0808_IE_CELL_ID_LIST_SEG_REL_CELLS); |
| 1126 | const struct tlv_p_entry *ie_cils_ne = TLVP_GET(tp, GSM0808_IE_CELL_ID_LIST_SEG_NE_CELLS); |
| 1127 | const struct tlv_p_entry *ie_cell_status = TLVP_GET(tp, GSM0808_IE_VGCS_VBS_CELL_STATUS); |
| 1128 | |
| 1129 | /* Cell Identifier List Segment, 3.2.2.27b */ |
| 1130 | if (ie_cils_est) { |
| 1131 | rc = gsm0808_dec_cell_id_list_segment(&r->cils_est, ie_cils_est->val, ie_cils_est->len); |
| 1132 | if (rc < 0) { |
| 1133 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Decoding Cell Identifier gave rc=%d\n", rc); |
| 1134 | return -EINVAL; |
| 1135 | } |
| 1136 | r->cils_est_present = true; |
| 1137 | } |
| 1138 | |
| 1139 | /* Cell Identifier List Segment, 3.2.2.27c */ |
| 1140 | if (ie_cils_tbe) { |
| 1141 | rc = gsm0808_dec_cell_id_list_segment(&r->cils_tbe, ie_cils_tbe->val, ie_cils_tbe->len); |
| 1142 | if (rc < 0) { |
| 1143 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Decoding Cell Identifier gave rc=%d\n", rc); |
| 1144 | return -EINVAL; |
| 1145 | } |
| 1146 | r->cils_tbe_present = true; |
| 1147 | } |
| 1148 | |
| 1149 | /* Cell Identifier List Segment, 3.2.2.27e */ |
| 1150 | if (ie_cils_rel) { |
| 1151 | rc = gsm0808_dec_cell_id_list_segment(&r->cils_rel, ie_cils_rel->val, ie_cils_rel->len); |
| 1152 | if (rc < 0) { |
| 1153 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Decoding Cell Identifier gave rc=%d\n", rc); |
| 1154 | return -EINVAL; |
| 1155 | } |
| 1156 | r->cils_rel_present = true; |
| 1157 | } |
| 1158 | |
| 1159 | /* Cell Identifier List Segment, 3.2.2.27f */ |
| 1160 | if (ie_cils_ne) { |
| 1161 | rc = gsm0808_dec_cell_id_list_segment(&r->cils_ne, ie_cils_ne->val, ie_cils_ne->len); |
| 1162 | if (rc < 0) { |
| 1163 | LOG_RAN_A_DEC_MSG(LOGL_ERROR, "Decoding Cell Identifier gave rc=%d\n", rc); |
| 1164 | return -EINVAL; |
| 1165 | } |
| 1166 | r->cils_ne_present = true; |
| 1167 | } |
| 1168 | |
| 1169 | /* VGCS/VBS Cell Status, 3.2.2.94 */ |
| 1170 | if (ie_cell_status && ie_cell_status->len) { |
| 1171 | r->cell_status = ie_cell_status->val[0] & 0x73; |
| 1172 | r->cell_status_present = true; |
| 1173 | } |
| 1174 | |
| 1175 | return ran_decoded(ran_dec, &ran_dec_msg); |
| 1176 | } |
| 1177 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1178 | static int ran_a_decode_bssmap(struct ran_dec *ran_dec, struct msgb *bssmap) |
| 1179 | { |
| 1180 | struct tlv_parsed tp[2]; |
| 1181 | int rc; |
| 1182 | struct bssmap_header *h = msgb_l2(bssmap); |
| 1183 | uint8_t msg_type; |
| 1184 | bssmap->l3h = bssmap->l2h + sizeof(*h); |
| 1185 | |
| 1186 | if (msgb_l3len(bssmap) < 1) { |
| 1187 | LOG_RAN_A_DEC(ran_dec, LOGL_ERROR, "No data received, discarding message\n"); |
| 1188 | return -1; |
| 1189 | } |
| 1190 | |
| 1191 | if (msgb_l3len(bssmap) < h->length) { |
Neels Hofmeyr | f092301 | 2019-08-22 17:19:49 +0200 | [diff] [blame] | 1192 | LOG_RAN_A_DEC(ran_dec, LOGL_ERROR, "BSSMAP data truncated, discarding message:" |
| 1193 | " msgb_l3len(bssmap) == %u < bssmap_header->length == %u\n", |
| 1194 | msgb_l3len(bssmap), h->length); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1195 | return -1; |
| 1196 | } |
| 1197 | |
| 1198 | if (msgb_l3len(bssmap) > h->length) { |
Neels Hofmeyr | f092301 | 2019-08-22 17:19:49 +0200 | [diff] [blame] | 1199 | LOG_RAN_A_DEC(ran_dec, LOGL_NOTICE, "There are %u extra bytes after the BSSMAP data, truncating:" |
| 1200 | " msgb_l3len(bssmap) == %u > bssmap_header->length == %u\n", |
| 1201 | msgb_l3len(bssmap) - h->length, |
| 1202 | msgb_l3len(bssmap), h->length); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1203 | msgb_l3trim(bssmap, h->length); |
| 1204 | } |
| 1205 | |
| 1206 | /* h->type == BSSAP_MSG_BSS_MANAGEMENT; h->length is the data length, |
| 1207 | * which starts with the MAP msg_type, followed by IEs. */ |
| 1208 | msg_type = bssmap->l3h[0]; |
| 1209 | rc = osmo_bssap_tlv_parse2(tp, ARRAY_SIZE(tp), bssmap->l3h + 1, h->length - 1); |
| 1210 | if (rc < 0) { |
| 1211 | LOG_RAN_A_DEC(ran_dec, LOGL_ERROR, "Failed parsing TLV, discarding message\n"); |
| 1212 | return -EINVAL; |
| 1213 | } |
| 1214 | |
Neels Hofmeyr | 72fc706 | 2019-10-08 06:24:17 +0200 | [diff] [blame] | 1215 | LOG_RAN_A_DEC(ran_dec, LOGL_DEBUG, "%s\n", gsm0808_bssmap_name(msg_type)); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1216 | |
| 1217 | switch (msg_type) { |
| 1218 | case BSS_MAP_MSG_COMPLETE_LAYER_3: |
| 1219 | return ran_a_decode_l3_compl(ran_dec, bssmap, tp); |
| 1220 | case BSS_MAP_MSG_CLEAR_RQST: |
| 1221 | return ran_a_decode_clear_request(ran_dec, bssmap, tp); |
| 1222 | case BSS_MAP_MSG_CLEAR_COMPLETE: |
| 1223 | return ran_a_decode_clear_complete(ran_dec, bssmap, tp); |
| 1224 | case BSS_MAP_MSG_CLASSMARK_UPDATE: |
| 1225 | return ran_a_decode_classmark_update(ran_dec, bssmap, tp); |
| 1226 | case BSS_MAP_MSG_CIPHER_MODE_COMPLETE: |
| 1227 | return ran_a_decode_cipher_mode_complete(ran_dec, bssmap, tp); |
| 1228 | case BSS_MAP_MSG_CIPHER_MODE_REJECT: |
| 1229 | return ran_a_decode_cipher_mode_reject(ran_dec, bssmap, tp); |
| 1230 | case BSS_MAP_MSG_ASSIGMENT_COMPLETE: |
| 1231 | rc = ran_a_decode_assignment_complete(ran_dec, bssmap, tp); |
| 1232 | if (rc < 0) { |
| 1233 | struct ran_msg ran_dec_msg = { |
| 1234 | .msg_type = RAN_MSG_ASSIGNMENT_FAILURE, |
| 1235 | .msg_name = "BSSMAP Assignment Complete but failed to decode", |
| 1236 | .clear_request = { |
| 1237 | .bssap_cause = GSM0808_CAUSE_EQUIPMENT_FAILURE, |
| 1238 | }, |
| 1239 | }; |
| 1240 | ran_decoded(ran_dec, &ran_dec_msg); |
| 1241 | } |
| 1242 | return rc; |
| 1243 | case BSS_MAP_MSG_ASSIGMENT_FAILURE: |
| 1244 | return ran_a_decode_assignment_failure(ran_dec, bssmap, tp); |
| 1245 | case BSS_MAP_MSG_SAPI_N_REJECT: |
| 1246 | return ran_a_decode_sapi_n_reject(ran_dec, bssmap, tp); |
| 1247 | case BSS_MAP_MSG_LCLS_NOTIFICATION: |
| 1248 | return ran_a_decode_lcls_notification(ran_dec, bssmap, tp); |
Andreas Eversberg | 2d27e2c | 2023-04-23 12:05:44 +0200 | [diff] [blame] | 1249 | case BSS_MAP_MSG_VGCS_VBS_SETUP_ACK: |
| 1250 | return ran_a_decode_vgcs_vbs_setup_ack(ran_dec, bssmap, tp); |
| 1251 | case BSS_MAP_MSG_VGCS_VBS_SETUP_REFUSE: |
| 1252 | return ran_a_decode_vgcs_vbs_setup_refuse(ran_dec, bssmap, tp); |
| 1253 | case BSS_MAP_MSG_VGCS_VBS_ASSIGNMENT_RESULT: |
| 1254 | return ran_a_decode_vgcs_vbs_assign_res(ran_dec, bssmap, tp); |
| 1255 | case BSS_MAP_MSG_VGCS_VBS_ASSIGNMENT_FAILURE: |
| 1256 | return ran_a_decode_vgcs_vbs_assign_fail(ran_dec, bssmap, tp); |
| 1257 | case BSS_MAP_MSG_VGCS_VBS_QUEUING_INDICATION: |
| 1258 | return ran_a_decode_vgcs_vbs_queuing_ind(ran_dec, bssmap, tp); |
| 1259 | case BSS_MAP_MSG_UPLINK_RQST: |
| 1260 | return ran_a_decode_uplink_request(ran_dec, bssmap, tp); |
| 1261 | case BSS_MAP_MSG_UPLINK_RQST_CONFIRMATION: |
| 1262 | return ran_a_decode_uplink_request_cnf(ran_dec, bssmap, tp); |
| 1263 | case BSS_MAP_MSG_UPLINK_APP_DATA: |
| 1264 | return ran_a_decode_uplink_application_data(ran_dec, bssmap, tp); |
| 1265 | case BSS_MAP_MSG_UPLINK_RELEASE_INDICATION: |
| 1266 | return ran_a_decode_uplink_release_ind(ran_dec, bssmap, tp); |
| 1267 | case BSS_MAP_MSG_VGCS_VBS_ASSIGNMENT_STATUS: |
| 1268 | return ran_a_decode_vgcs_vbs_assign_status(ran_dec, bssmap, tp); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1269 | |
| 1270 | /* From current RAN peer, the Handover origin: */ |
| 1271 | case BSS_MAP_MSG_HANDOVER_REQUIRED: |
| 1272 | return ran_a_decode_handover_required(ran_dec, bssmap, tp); |
| 1273 | |
| 1274 | /* From current MSC to remote handover target MSC */ |
| 1275 | case BSS_MAP_MSG_HANDOVER_RQST: |
| 1276 | return ran_a_decode_handover_request(ran_dec, bssmap, tp); |
| 1277 | |
| 1278 | /* From potential new RAN peer, the Handover target: */ |
| 1279 | case BSS_MAP_MSG_HANDOVER_RQST_ACKNOWLEDGE: |
| 1280 | return ran_a_decode_handover_request_ack(ran_dec, bssmap, tp); |
| 1281 | case BSS_MAP_MSG_HANDOVER_DETECT: |
| 1282 | return ran_a_decode_handover_detect(ran_dec, bssmap, tp); |
| 1283 | case BSS_MAP_MSG_HANDOVER_SUCCEEDED: |
| 1284 | return ran_a_decode_handover_succeeded(ran_dec, bssmap, tp); |
| 1285 | case BSS_MAP_MSG_HANDOVER_COMPLETE: |
| 1286 | return ran_a_decode_handover_complete(ran_dec, bssmap, tp); |
| 1287 | |
| 1288 | /* From any Handover peer: */ |
| 1289 | case BSS_MAP_MSG_HANDOVER_FAILURE: |
| 1290 | return ran_a_decode_handover_failure(ran_dec, bssmap, tp); |
| 1291 | |
| 1292 | default: |
| 1293 | LOG_RAN_A_DEC(ran_dec, LOGL_ERROR, "Unimplemented msg type: %s\n", gsm0808_bssmap_name(msg_type)); |
| 1294 | return -EINVAL; |
| 1295 | } |
| 1296 | |
| 1297 | return -EINVAL; |
| 1298 | } |
| 1299 | |
| 1300 | static int ran_a_decode_l3(struct ran_dec *ran_dec, struct msgb *l3) |
| 1301 | { |
| 1302 | struct dtap_header *dtap = msgb_l2(l3); |
| 1303 | struct ran_msg ran_dec_msg = { |
| 1304 | .msg_type = RAN_MSG_DTAP, |
| 1305 | .msg_name = "BSSAP DTAP", |
| 1306 | .dtap = l3, |
| 1307 | }; |
| 1308 | l3->l3h = l3->l2h + sizeof(struct dtap_header); |
| 1309 | OMSC_LINKID_CB(l3) = dtap->link_id; |
| 1310 | return ran_decoded(ran_dec, &ran_dec_msg); |
| 1311 | } |
| 1312 | |
| 1313 | int ran_a_decode_l2(struct ran_dec *ran_dec, struct msgb *bssap) |
| 1314 | { |
| 1315 | uint8_t bssap_type; |
| 1316 | OSMO_ASSERT(bssap); |
| 1317 | |
| 1318 | if (!msgb_l2(bssap) || !msgb_l2len(bssap)) { |
| 1319 | LOG_RAN_A_DEC(ran_dec, LOGL_ERROR, "Cannot decode L2, msg->l2h is unset / empty: %s\n", |
| 1320 | msgb_hexdump(bssap)); |
| 1321 | return -EINVAL; |
| 1322 | } |
| 1323 | |
| 1324 | if (msgb_l2len(bssap) < sizeof(struct bssmap_header)) { |
| 1325 | LOG_RAN_A_DEC(ran_dec, LOGL_ERROR, "The header is too short -- discarding message\n"); |
| 1326 | return -EINVAL; |
| 1327 | } |
| 1328 | |
| 1329 | bssap_type = bssap->l2h[0]; |
| 1330 | switch (bssap_type) { |
| 1331 | case BSSAP_MSG_BSS_MANAGEMENT: |
| 1332 | return ran_a_decode_bssmap(ran_dec, bssap); |
| 1333 | case BSSAP_MSG_DTAP: |
| 1334 | return ran_a_decode_l3(ran_dec, bssap); |
| 1335 | default: |
| 1336 | LOG_RAN_A_DEC(ran_dec, LOGL_ERROR, "Unimplemented BSSAP msg type: %s\n", gsm0808_bssap_name(bssap_type)); |
| 1337 | return -EINVAL; |
| 1338 | } |
| 1339 | } |
| 1340 | |
| 1341 | static struct msgb *ran_a_wrap_dtap(struct msgb *dtap) |
| 1342 | { |
| 1343 | struct msgb *an_apdu; |
| 1344 | dtap->l3h = dtap->data; |
| 1345 | an_apdu = gsm0808_create_dtap(dtap, OMSC_LINKID_CB(dtap)); |
| 1346 | an_apdu->l2h = an_apdu->data; |
| 1347 | msgb_free(dtap); |
| 1348 | return an_apdu; |
| 1349 | } |
| 1350 | |
| 1351 | static int ran_a_channel_type_to_speech_codec_list(struct gsm0808_speech_codec_list *scl, const struct gsm0808_channel_type *ct) |
| 1352 | { |
| 1353 | unsigned int i; |
| 1354 | int rc; |
| 1355 | |
| 1356 | memset(scl, 0, sizeof(*scl)); |
Oliver Smith | b1a1588 | 2023-05-23 13:54:36 +0200 | [diff] [blame] | 1357 | |
| 1358 | switch (ct->ch_indctr) { |
| 1359 | case GSM0808_CHAN_DATA: |
| 1360 | scl->codec[0].type = GSM0808_SCT_CSD; |
| 1361 | scl->len = 1; |
| 1362 | break; |
| 1363 | case GSM0808_CHAN_SPEECH: |
| 1364 | for (i = 0; i < ct->perm_spch_len; i++) { |
| 1365 | rc = gsm0808_speech_codec_from_chan_type(&scl->codec[i], ct->perm_spch[i]); |
| 1366 | if (rc != 0) |
| 1367 | return -EINVAL; |
| 1368 | } |
| 1369 | scl->len = i; |
| 1370 | break; |
| 1371 | default: |
| 1372 | OSMO_ASSERT(0); |
| 1373 | break; |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1374 | } |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1375 | |
| 1376 | return 0; |
| 1377 | } |
| 1378 | |
| 1379 | /* Compose a BSSAP Assignment Command. |
| 1380 | * Passing an RTP address is optional. |
| 1381 | * The msub is passed merely for error logging. */ |
| 1382 | static struct msgb *ran_a_make_assignment_command(struct osmo_fsm_inst *log_fi, |
| 1383 | const struct ran_assignment_command *ac) |
| 1384 | { |
| 1385 | struct gsm0808_speech_codec_list scl; |
| 1386 | struct gsm0808_speech_codec_list *use_scl = NULL; |
| 1387 | struct sockaddr_storage rtp_addr; |
| 1388 | struct sockaddr_storage *use_rtp_addr = NULL; |
Pau Espin Pedrol | a3cdab4 | 2019-05-09 17:54:08 +0200 | [diff] [blame] | 1389 | struct msgb *msg; |
Philipp Maier | f34d945 | 2020-06-05 15:49:35 +0200 | [diff] [blame] | 1390 | const uint32_t *call_id = NULL; |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1391 | int rc; |
| 1392 | |
| 1393 | if (!ac->channel_type) { |
| 1394 | LOG_RAN_A_ENC(log_fi, LOGL_ERROR, "Assignment Command: missing Channel Type\n"); |
| 1395 | return NULL; |
| 1396 | } |
| 1397 | |
Oliver Smith | b1a1588 | 2023-05-23 13:54:36 +0200 | [diff] [blame] | 1398 | if (ac->channel_type->ch_indctr == GSM0808_CHAN_SPEECH || ac->channel_type->ch_indctr == GSM0808_CHAN_DATA) { |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1399 | rc = ran_a_channel_type_to_speech_codec_list(&scl, ac->channel_type); |
| 1400 | if (rc < 0) { |
| 1401 | LOG_RAN_A_ENC(log_fi, LOGL_ERROR, "Assignment Command: Cannot translate Channel Type to Speech Codec List\n"); |
| 1402 | return NULL; |
| 1403 | } |
| 1404 | use_scl = &scl; |
| 1405 | |
| 1406 | /* Package RTP-Address data */ |
Neels Hofmeyr | 84ce206 | 2019-10-05 05:15:25 +0200 | [diff] [blame] | 1407 | if (osmo_sockaddr_str_is_nonzero(ac->cn_rtp)) { |
Pau Espin Pedrol | d35abfa | 2020-08-31 20:44:50 +0200 | [diff] [blame] | 1408 | struct sockaddr_in *sin; |
| 1409 | struct sockaddr_in6 *sin6; |
| 1410 | int family = osmo_ip_str_type(ac->cn_rtp->ip); |
| 1411 | switch (family) { |
| 1412 | case AF_INET: |
| 1413 | sin = (struct sockaddr_in *)&rtp_addr; |
| 1414 | sin->sin_family = AF_INET; |
| 1415 | sin->sin_port = osmo_htons(ac->cn_rtp->port); |
| 1416 | if (inet_pton(AF_INET, ac->cn_rtp->ip, &sin->sin_addr) != 1) { |
| 1417 | LOG_RAN_A_ENC(log_fi, LOGL_ERROR, |
| 1418 | "Assignment Command: Invalid RTP-Address %s\n", |
| 1419 | ac->cn_rtp->ip); |
| 1420 | return NULL; |
| 1421 | } |
| 1422 | if (sin->sin_port == 0) { |
| 1423 | LOG_RAN_A_ENC(log_fi, LOGL_ERROR, |
| 1424 | "Assignment Command: Invalid RTP-Port\n"); |
| 1425 | return NULL; |
| 1426 | } |
| 1427 | break; |
| 1428 | case AF_INET6: |
| 1429 | sin6 = (struct sockaddr_in6 *)&rtp_addr; |
| 1430 | sin6->sin6_family = AF_INET6; |
| 1431 | sin6->sin6_port = osmo_htons(ac->cn_rtp->port); |
| 1432 | if (inet_pton(AF_INET6, ac->cn_rtp->ip, &sin6->sin6_addr) != 1) { |
| 1433 | LOG_RAN_A_ENC(log_fi, LOGL_ERROR, |
| 1434 | "Assignment Command: Invalid RTP-Address %s\n", |
| 1435 | ac->cn_rtp->ip); |
| 1436 | return NULL; |
| 1437 | } |
| 1438 | if (sin6->sin6_port == 0) { |
| 1439 | LOG_RAN_A_ENC(log_fi, LOGL_ERROR, |
| 1440 | "Assignment Command: Invalid RTP-Port\n"); |
| 1441 | return NULL; |
| 1442 | } |
| 1443 | break; |
| 1444 | default: |
| 1445 | LOG_RAN_A_ENC(log_fi, LOGL_ERROR, |
| 1446 | "Assignment Command: Invalid RTP-Address type for %s\n", |
| 1447 | ac->cn_rtp->ip); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1448 | return NULL; |
| 1449 | } |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1450 | use_rtp_addr = &rtp_addr; |
| 1451 | } |
| 1452 | } |
| 1453 | |
Philipp Maier | f34d945 | 2020-06-05 15:49:35 +0200 | [diff] [blame] | 1454 | if(ac->call_id_present == true) |
| 1455 | call_id = &ac->call_id; |
| 1456 | |
Keith Whyte | a1a70be | 2021-05-16 02:59:52 +0200 | [diff] [blame] | 1457 | msg = gsm0808_create_ass2(ac->channel_type, NULL, use_rtp_addr, use_scl, call_id, |
| 1458 | NULL, ac->lcls); |
Vadim Yanitskiy | 8284fb0 | 2022-12-14 04:47:58 +0700 | [diff] [blame] | 1459 | if (msg == NULL) { |
| 1460 | LOG_RAN_A_ENC(log_fi, LOGL_ERROR, |
| 1461 | "Failed to encode BSSMAP Assignment Request message\n"); |
| 1462 | return NULL; |
| 1463 | } |
| 1464 | |
Andreas Eversberg | 9bbdc34 | 2023-06-21 13:35:38 +0200 | [diff] [blame] | 1465 | /* Append optional IEs: Group Call Reference and Osmux CID */ |
| 1466 | OSMO_ASSERT(msg->l3h[1] == msgb_l3len(msg) - 2); /* TL not in len */ |
| 1467 | if (ac->callref_present) |
| 1468 | gsm0808_enc_group_callref(msg, &ac->callref); |
Pau Espin Pedrol | a3cdab4 | 2019-05-09 17:54:08 +0200 | [diff] [blame] | 1469 | if (ac->osmux_present) |
Andreas Eversberg | 9bbdc34 | 2023-06-21 13:35:38 +0200 | [diff] [blame] | 1470 | msgb_tv_put(msg, GSM0808_IE_OSMO_OSMUX_CID, ac->osmux_cid); |
| 1471 | msg->l3h[1] = msgb_l3len(msg) - 2; |
Pau Espin Pedrol | a3cdab4 | 2019-05-09 17:54:08 +0200 | [diff] [blame] | 1472 | return msg; |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1473 | } |
| 1474 | |
| 1475 | /* For an A5/N number a5_n set dst to the matching GSM0808_ALG_ID_A5_<n>. */ |
| 1476 | static int a5_n_to_gsm0808_chosen_enc_alg(uint8_t *dst, int a5_n) |
| 1477 | { |
| 1478 | switch (a5_n) { |
| 1479 | case 0: |
| 1480 | *dst = GSM0808_ALG_ID_A5_0; |
| 1481 | return 0; |
| 1482 | case 1: |
| 1483 | *dst = GSM0808_ALG_ID_A5_1; |
| 1484 | return 0; |
| 1485 | case 2: |
| 1486 | *dst = GSM0808_ALG_ID_A5_2; |
| 1487 | return 0; |
| 1488 | case 3: |
| 1489 | *dst = GSM0808_ALG_ID_A5_3; |
| 1490 | return 0; |
Neels Hofmeyr | 6ce2edc | 2021-06-09 22:26:11 +0200 | [diff] [blame] | 1491 | case 4: |
| 1492 | *dst = GSM0808_ALG_ID_A5_4; |
| 1493 | return 0; |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1494 | default: |
| 1495 | return -ENOTSUP; |
| 1496 | } |
| 1497 | } |
| 1498 | |
| 1499 | static int make_encrypt_info_perm_algo(struct osmo_fsm_inst *fi, struct gsm0808_encrypt_info *ei, |
| 1500 | uint8_t a5_encryption_mask, const struct osmo_gsm48_classmark *cm) |
| 1501 | { |
| 1502 | int i; |
| 1503 | int j = 0; |
| 1504 | for (i = 0; i < 8; i++) { |
| 1505 | int supported; |
| 1506 | |
| 1507 | /* A5/n permitted by osmo-msc.cfg? */ |
| 1508 | if (!(a5_encryption_mask & (1 << i))) |
| 1509 | continue; |
| 1510 | |
| 1511 | /* A5/n supported by MS? */ |
| 1512 | supported = osmo_gsm48_classmark_supports_a5(cm, i); |
| 1513 | if (supported != 1) |
| 1514 | continue; |
| 1515 | |
| 1516 | if (a5_n_to_gsm0808_chosen_enc_alg(&ei->perm_algo[j], i)) { |
| 1517 | LOG_RAN_A_ENC(fi, LOGL_ERROR, "Not supported: A5/%d algorithm\n", i); |
| 1518 | return -1; |
| 1519 | } |
| 1520 | j++; |
| 1521 | ei->perm_algo_len = j; |
| 1522 | } |
| 1523 | return 0; |
| 1524 | } |
| 1525 | |
| 1526 | /* For ran_a_make_cipher_mode_command(), for |
| 1527 | * memcpy(ei.key, cm->vec->kc, sizeof(cm->vec->kc)); |
| 1528 | */ |
| 1529 | osmo_static_assert(sizeof(((struct gsm0808_encrypt_info*)0)->key) >= sizeof(((struct osmo_auth_vector*)0)->kc), |
| 1530 | gsm0808_encrypt_info_key_fits_osmo_auth_vec_kc); |
| 1531 | static struct msgb *ran_a_make_cipher_mode_command(struct osmo_fsm_inst *fi, const struct ran_cipher_mode_command *cm) |
| 1532 | { |
Neels Hofmeyr | cdcfc80 | 2021-06-09 22:26:11 +0200 | [diff] [blame] | 1533 | struct gsm0808_cipher_mode_command cmc = { |
| 1534 | .cipher_response_mode_present = true, |
| 1535 | .cipher_response_mode = 1, /* 1: include IMEISV (3GPP TS 48.008 3.2.2.34) */ |
| 1536 | }; |
| 1537 | struct gsm0808_encrypt_info *ei = &cmc.ei; |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1538 | char buf[16 * 2 + 1]; |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1539 | |
Neels Hofmeyr | cdcfc80 | 2021-06-09 22:26:11 +0200 | [diff] [blame] | 1540 | if (make_encrypt_info_perm_algo(fi, ei, cm->geran.a5_encryption_mask, cm->classmark)) |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1541 | return NULL; |
| 1542 | |
Neels Hofmeyr | cdcfc80 | 2021-06-09 22:26:11 +0200 | [diff] [blame] | 1543 | if (ei->perm_algo_len == 0) { |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1544 | LOG_RAN_A_ENC(fi, LOGL_ERROR, "cannot start ciphering, no intersection between MSC-configured" |
| 1545 | " and MS-supported A5 algorithms. MSC: 0x%02x MS: %s\n", |
| 1546 | cm->geran.a5_encryption_mask, osmo_gsm48_classmark_a5_name(cm->classmark)); |
| 1547 | return NULL; |
| 1548 | } |
| 1549 | |
| 1550 | /* In case of UMTS AKA, the Kc for ciphering must be derived from the 3G auth |
| 1551 | * tokens. vec->kc was calculated from the GSM algorithm and is not |
| 1552 | * necessarily a match for the UMTS AKA tokens. */ |
Neels Hofmeyr | 6ce2edc | 2021-06-09 22:26:11 +0200 | [diff] [blame] | 1553 | if (cm->geran.umts_aka) { |
| 1554 | int i; |
Neels Hofmeyr | cdcfc80 | 2021-06-09 22:26:11 +0200 | [diff] [blame] | 1555 | osmo_auth_c3(ei->key, cm->vec->ck, cm->vec->ik); |
Neels Hofmeyr | 6ce2edc | 2021-06-09 22:26:11 +0200 | [diff] [blame] | 1556 | |
| 1557 | for (i = 0; i < ei->perm_algo_len; i++) { |
| 1558 | if (ei->perm_algo[i] != GSM0808_ALG_ID_A5_4) |
| 1559 | continue; |
| 1560 | /* A5/4 is included, so need to generate Kc128 */ |
| 1561 | osmo_kdf_kc128(cm->vec->ck, cm->vec->ik, cmc.kc128); |
| 1562 | cmc.kc128_present = true; |
| 1563 | break; |
| 1564 | } |
| 1565 | } else { |
Neels Hofmeyr | cdcfc80 | 2021-06-09 22:26:11 +0200 | [diff] [blame] | 1566 | memcpy(ei->key, cm->vec->kc, sizeof(cm->vec->kc)); |
Neels Hofmeyr | 6ce2edc | 2021-06-09 22:26:11 +0200 | [diff] [blame] | 1567 | } |
Neels Hofmeyr | cdcfc80 | 2021-06-09 22:26:11 +0200 | [diff] [blame] | 1568 | ei->key_len = sizeof(cm->vec->kc); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1569 | |
| 1570 | /* Store chosen GERAN key where the caller asked it to be stored. |
| 1571 | * alg_id remains unknown until we receive a Cipher Mode Complete from the BSC */ |
| 1572 | if (cm->geran.chosen_key) { |
Neels Hofmeyr | 6ce2edc | 2021-06-09 22:26:11 +0200 | [diff] [blame] | 1573 | *cm->geran.chosen_key = (struct geran_encr){0}; |
| 1574 | |
Neels Hofmeyr | cdcfc80 | 2021-06-09 22:26:11 +0200 | [diff] [blame] | 1575 | if (ei->key_len > sizeof(cm->geran.chosen_key->key)) { |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1576 | LOG_RAN_A_ENC(fi, LOGL_ERROR, "Chosen key is larger than I can store\n"); |
| 1577 | return NULL; |
| 1578 | } |
Neels Hofmeyr | cdcfc80 | 2021-06-09 22:26:11 +0200 | [diff] [blame] | 1579 | memcpy(cm->geran.chosen_key->key, ei->key, ei->key_len); |
| 1580 | cm->geran.chosen_key->key_len = ei->key_len; |
Neels Hofmeyr | 6ce2edc | 2021-06-09 22:26:11 +0200 | [diff] [blame] | 1581 | |
| 1582 | if (cmc.kc128_present) { |
| 1583 | memcpy(cm->geran.chosen_key->kc128, cmc.kc128, 16); |
| 1584 | cm->geran.chosen_key->kc128_present = true; |
| 1585 | } |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1586 | } |
| 1587 | |
| 1588 | LOG_RAN_A_ENC(fi, LOGL_DEBUG, "Tx BSSMAP CIPHER MODE COMMAND to BSC, %u ciphers (%s) key %s\n", |
Neels Hofmeyr | cdcfc80 | 2021-06-09 22:26:11 +0200 | [diff] [blame] | 1589 | ei->perm_algo_len, osmo_hexdump_nospc(ei->perm_algo, ei->perm_algo_len), |
| 1590 | osmo_hexdump_buf(buf, sizeof(buf), ei->key, ei->key_len, NULL, false)); |
| 1591 | return gsm0808_create_cipher2(&cmc); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1592 | } |
| 1593 | |
| 1594 | struct msgb *ran_a_make_handover_request(struct osmo_fsm_inst *log_fi, const struct ran_handover_request *n) |
| 1595 | { |
| 1596 | struct sockaddr_storage ss; |
| 1597 | struct gsm0808_handover_request r = { |
| 1598 | .cell_identifier_serving = n->cell_id_serving, |
| 1599 | .cell_identifier_target = n->cell_id_target, |
| 1600 | .cause = n->bssap_cause, |
| 1601 | .current_channel_type_1_present = n->current_channel_type_1_present, |
| 1602 | .current_channel_type_1 = n->current_channel_type_1, |
| 1603 | |
| 1604 | .speech_version_used = n->speech_version_used, |
| 1605 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1606 | .old_bss_to_new_bss_info_raw = n->old_bss_to_new_bss_info_raw, |
| 1607 | .old_bss_to_new_bss_info_raw_len = n->old_bss_to_new_bss_info_raw_len, |
| 1608 | |
| 1609 | .imsi = n->imsi, |
| 1610 | .codec_list_msc_preferred = n->codec_list_msc_preferred, |
Philipp Maier | 7da956e | 2020-06-09 14:34:40 +0200 | [diff] [blame] | 1611 | .call_id_present = n->call_id_present, |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1612 | .call_id = n->call_id, |
| 1613 | .global_call_reference = n->global_call_reference, |
| 1614 | .global_call_reference_len = n->global_call_reference_len, |
| 1615 | }; |
| 1616 | |
| 1617 | if (!n->geran.channel_type) { |
| 1618 | LOG_RAN_A_ENC(log_fi, LOGL_ERROR, "Channel Type required for encoding Handover Request in BSSAP\n"); |
| 1619 | return NULL; |
| 1620 | } |
| 1621 | r.channel_type = *n->geran.channel_type; |
| 1622 | |
| 1623 | /* Encryption Information */ |
| 1624 | make_encrypt_info_perm_algo(log_fi, &r.encryption_information, n->geran.a5_encryption_mask, n->classmark); |
| 1625 | if (n->geran.chosen_encryption && n->geran.chosen_encryption->key_len) { |
Vadim Yanitskiy | 444771d | 2019-05-11 04:46:24 +0700 | [diff] [blame] | 1626 | /* Prevent both source / destination buffer overrun / overflow */ |
| 1627 | if (n->geran.chosen_encryption->key_len > sizeof(r.encryption_information.key) |
| 1628 | || n->geran.chosen_encryption->key_len > sizeof(n->geran.chosen_encryption->key)) { |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1629 | LOG_RAN_A_ENC(log_fi, LOGL_ERROR, "Handover Request: invalid chosen encryption key size %u\n", |
| 1630 | n->geran.chosen_encryption->key_len); |
| 1631 | return NULL; |
| 1632 | } |
| 1633 | memcpy(r.encryption_information.key, |
| 1634 | n->geran.chosen_encryption->key, n->geran.chosen_encryption->key_len); |
| 1635 | r.encryption_information.key_len = n->geran.chosen_encryption->key_len; |
Vadim Yanitskiy | bfe8eb7 | 2019-05-11 03:52:28 +0700 | [diff] [blame] | 1636 | r.chosen_encryption_algorithm_serving = n->geran.chosen_encryption->alg_id; |
Neels Hofmeyr | db07fdc | 2021-06-09 22:27:47 +0200 | [diff] [blame] | 1637 | |
| 1638 | if (n->geran.chosen_encryption->kc128_present) { |
| 1639 | r.more_items = true; |
| 1640 | memcpy(r.kc128, n->geran.chosen_encryption->kc128, sizeof(r.kc128)); |
| 1641 | r.kc128_present = true; |
| 1642 | } |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1643 | } |
| 1644 | |
| 1645 | if (n->classmark) |
| 1646 | r.classmark_information = *n->classmark; |
| 1647 | |
Neels Hofmeyr | 84ce206 | 2019-10-05 05:15:25 +0200 | [diff] [blame] | 1648 | if (osmo_sockaddr_str_is_nonzero(n->rtp_ran_local)) { |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1649 | if (osmo_sockaddr_str_to_sockaddr(n->rtp_ran_local, &ss)) { |
| 1650 | LOG_RAN_A_ENC(log_fi, LOGL_ERROR, |
| 1651 | "Handover Request: invalid AoIP Transport Layer address/port: " |
| 1652 | OSMO_SOCKADDR_STR_FMT "\n", OSMO_SOCKADDR_STR_FMT_ARGS(n->rtp_ran_local)); |
| 1653 | return NULL; |
| 1654 | } |
| 1655 | r.aoip_transport_layer = &ss; |
| 1656 | } |
| 1657 | |
| 1658 | return gsm0808_create_handover_request(&r); |
| 1659 | } |
| 1660 | |
| 1661 | static struct msgb *ran_a_make_handover_request_ack(struct osmo_fsm_inst *caller_fi, const struct ran_handover_request_ack *r) |
| 1662 | { |
| 1663 | struct sockaddr_storage ss; |
| 1664 | struct gsm0808_handover_request_ack params = { |
| 1665 | .l3_info = r->rr_ho_command, |
| 1666 | .l3_info_len = r->rr_ho_command_len, |
| 1667 | .chosen_channel_present = r->chosen_channel_present, |
| 1668 | .chosen_channel = r->chosen_channel, |
| 1669 | .chosen_encr_alg = r->chosen_encr_alg, |
| 1670 | .chosen_speech_version = r->chosen_speech_version, |
| 1671 | }; |
| 1672 | |
Neels Hofmeyr | 84ce206 | 2019-10-05 05:15:25 +0200 | [diff] [blame] | 1673 | if (osmo_sockaddr_str_is_nonzero(&r->remote_rtp)) { |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1674 | osmo_sockaddr_str_to_sockaddr(&r->remote_rtp, &ss); |
| 1675 | params.aoip_transport_layer = &ss; |
| 1676 | } |
| 1677 | |
| 1678 | return gsm0808_create_handover_request_ack2(¶ms); |
| 1679 | } |
| 1680 | |
| 1681 | struct msgb *ran_a_make_handover_command(struct osmo_fsm_inst *log_fi, const struct ran_handover_command *n) |
| 1682 | { |
| 1683 | struct gsm0808_handover_command c = { |
| 1684 | .l3_info = n->rr_ho_command, |
| 1685 | .l3_info_len = n->rr_ho_command_len, |
| 1686 | }; |
| 1687 | |
| 1688 | return gsm0808_create_handover_command(&c); |
| 1689 | } |
| 1690 | |
| 1691 | struct msgb *ran_a_make_handover_failure(struct osmo_fsm_inst *log_fi, const struct ran_msg *msg) |
| 1692 | { |
| 1693 | struct gsm0808_handover_failure params = { |
| 1694 | .cause = msg->handover_failure.cause, |
| 1695 | }; |
| 1696 | return gsm0808_create_handover_failure(¶ms); |
| 1697 | } |
| 1698 | |
| 1699 | static struct msgb *_ran_a_encode(struct osmo_fsm_inst *caller_fi, const struct ran_msg *ran_enc_msg) |
| 1700 | { |
| 1701 | |
| 1702 | LOG_RAN_A_ENC(caller_fi, LOGL_DEBUG, "%s\n", ran_msg_type_name(ran_enc_msg->msg_type)); |
| 1703 | |
| 1704 | switch (ran_enc_msg->msg_type) { |
| 1705 | |
| 1706 | case RAN_MSG_DTAP: |
| 1707 | return ran_a_wrap_dtap(ran_enc_msg->dtap); |
| 1708 | |
| 1709 | case RAN_MSG_CLASSMARK_REQUEST: |
| 1710 | return gsm0808_create_classmark_request(); |
| 1711 | |
| 1712 | case RAN_MSG_CLEAR_COMMAND: |
| 1713 | return gsm0808_create_clear_command2(ran_enc_msg->clear_command.gsm0808_cause, |
| 1714 | ran_enc_msg->clear_command.csfb_ind); |
| 1715 | |
| 1716 | case RAN_MSG_ASSIGNMENT_COMMAND: |
| 1717 | return ran_a_make_assignment_command(caller_fi, &ran_enc_msg->assignment_command); |
| 1718 | |
Harald Welte | 544a32f | 2020-06-21 22:15:53 +0200 | [diff] [blame] | 1719 | case RAN_MSG_COMMON_ID: |
Pau Espin Pedrol | 6710670 | 2021-04-27 18:20:15 +0200 | [diff] [blame] | 1720 | return gsm0808_create_common_id(ran_enc_msg->common_id.imsi, NULL, |
| 1721 | ran_enc_msg->common_id.last_eutran_plmn_present ? |
| 1722 | &ran_enc_msg->common_id.last_eutran_plmn : |
| 1723 | NULL |
| 1724 | ); |
Harald Welte | 544a32f | 2020-06-21 22:15:53 +0200 | [diff] [blame] | 1725 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1726 | case RAN_MSG_CIPHER_MODE_COMMAND: |
| 1727 | return ran_a_make_cipher_mode_command(caller_fi, &ran_enc_msg->cipher_mode_command); |
| 1728 | |
| 1729 | case RAN_MSG_HANDOVER_REQUIRED_REJECT: |
| 1730 | return gsm0808_create_handover_required_reject(&ran_enc_msg->handover_required_reject); |
| 1731 | |
| 1732 | case RAN_MSG_HANDOVER_REQUEST: |
| 1733 | return ran_a_make_handover_request(caller_fi, &ran_enc_msg->handover_request); |
| 1734 | |
| 1735 | case RAN_MSG_HANDOVER_REQUEST_ACK: |
| 1736 | return ran_a_make_handover_request_ack(caller_fi, &ran_enc_msg->handover_request_ack); |
| 1737 | |
| 1738 | case RAN_MSG_HANDOVER_COMMAND: |
| 1739 | return ran_a_make_handover_command(caller_fi, &ran_enc_msg->handover_command); |
| 1740 | |
| 1741 | case RAN_MSG_HANDOVER_SUCCEEDED: |
| 1742 | return gsm0808_create_handover_succeeded(); |
| 1743 | |
| 1744 | case RAN_MSG_HANDOVER_FAILURE: |
| 1745 | return ran_a_make_handover_failure(caller_fi, ran_enc_msg); |
| 1746 | |
Andreas Eversberg | 2d27e2c | 2023-04-23 12:05:44 +0200 | [diff] [blame] | 1747 | case RAN_MSG_VGCS_VBS_SETUP: |
| 1748 | return gsm0808_create_vgcs_vbs_setup(&ran_enc_msg->vgcs_vbs_setup); |
| 1749 | |
| 1750 | case RAN_MSG_VGCS_VBS_ASSIGN_REQ: |
| 1751 | return gsm0808_create_vgcs_vbs_assign_req(&ran_enc_msg->vgcs_vbs_assign_req); |
| 1752 | |
| 1753 | case RAN_MSG_UPLINK_REQUEST_ACK: |
| 1754 | return gsm0808_create_uplink_request_ack(&ran_enc_msg->uplink_request_ack); |
| 1755 | |
| 1756 | case RAN_MSG_UPLINK_REJECT_CMD: |
| 1757 | return gsm0808_create_uplink_reject_cmd(&ran_enc_msg->uplink_reject_cmd); |
| 1758 | |
| 1759 | case RAN_MSG_UPLINK_RELEASE_CMD: |
| 1760 | return gsm0808_create_uplink_release_cmd(ran_enc_msg->uplink_release_cmd.cause); |
| 1761 | |
| 1762 | case RAN_MSG_UPLINK_SEIZED_CMD: |
| 1763 | return gsm0808_create_uplink_seized_cmd(&ran_enc_msg->uplink_seized_cmd); |
| 1764 | |
| 1765 | case RAN_MSG_VGCS_ADDITIONAL_INFO: |
| 1766 | return gsm0808_create_vgcs_additional_info(&ran_enc_msg->vgcs_additional_info.talker_identity); |
| 1767 | |
| 1768 | case RAN_MSG_VGCS_VBS_AREA_CELL_INFO: |
| 1769 | return gsm0808_create_vgcs_vbs_area_cell_info(&ran_enc_msg->vgcs_vbs_area_cell_info); |
| 1770 | |
| 1771 | case RAN_MSG_VGCS_SMS: |
| 1772 | return gsm0808_create_vgcs_sms(&ran_enc_msg->vgcs_sms.sms_to_vgcs); |
| 1773 | |
| 1774 | case RAN_MSG_NOTIFICATION_DATA: |
| 1775 | return gsm0808_create_notification_data(&ran_enc_msg->notification_data); |
| 1776 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1777 | default: |
| 1778 | LOG_RAN_A_ENC(caller_fi, LOGL_ERROR, "Unimplemented RAN-encode message type: %s\n", |
| 1779 | ran_msg_type_name(ran_enc_msg->msg_type)); |
| 1780 | return NULL; |
| 1781 | } |
| 1782 | } |
| 1783 | |
| 1784 | struct msgb *ran_a_encode(struct osmo_fsm_inst *caller_fi, const struct ran_msg *ran_enc_msg) |
| 1785 | { |
| 1786 | struct msgb *msg = _ran_a_encode(caller_fi, ran_enc_msg); |
| 1787 | |
| 1788 | if (!msg) |
| 1789 | return NULL; |
| 1790 | |
| 1791 | msg->l2h = msg->data; |
| 1792 | |
| 1793 | /* some consistency checks to ensure we don't send invalid length */ |
| 1794 | switch (msg->l2h[0]) { |
| 1795 | case BSSAP_MSG_DTAP: |
| 1796 | OSMO_ASSERT(msgb_l2len(msg) == msg->l2h[2] + 3); |
| 1797 | break; |
| 1798 | case BSSAP_MSG_BSS_MANAGEMENT: |
| 1799 | OSMO_ASSERT(msgb_l2len(msg) == msg->l2h[1] + 2); |
| 1800 | break; |
| 1801 | default: |
| 1802 | break; |
| 1803 | } |
| 1804 | |
| 1805 | return msg; |
| 1806 | } |
| 1807 | |
Neels Hofmeyr | b697274 | 2020-06-26 15:20:51 +0200 | [diff] [blame] | 1808 | static void cl_parse_osmux(struct osmo_fsm_inst *log_fi, struct msgb *msg, int *supports_osmux) |
| 1809 | { |
| 1810 | struct tlv_parsed tp; |
| 1811 | int rc; |
| 1812 | |
| 1813 | if (supports_osmux == NULL) |
| 1814 | return; |
| 1815 | |
| 1816 | rc = tlv_parse(&tp, gsm0808_att_tlvdef(), msgb_l3(msg) + 1, msgb_l3len(msg) - 1, 0, 0); |
| 1817 | if (rc < 0) { |
| 1818 | LOGPFSMSL(log_fi, DBSSAP, LOGL_ERROR, "BSSMAP: Failed parsing TLV looking for Osmux support\n"); |
| 1819 | return; |
| 1820 | } |
| 1821 | |
| 1822 | if (TLVP_PRESENT(&tp, GSM0808_IE_OSMO_OSMUX_SUPPORT)) { |
| 1823 | *supports_osmux = true; |
| 1824 | } else { |
| 1825 | *supports_osmux = false; |
| 1826 | } |
| 1827 | } |
| 1828 | |
| 1829 | /* Return 1 for a RESET, 2 for a RESET ACK message, 0 otherwise. |
| 1830 | * In supports_osmux, return 0 for no information, 1 for support detected, -1 for non-support detected. */ |
| 1831 | enum reset_msg_type bssmap_is_reset_msg(const struct sccp_ran_inst *sri, struct osmo_fsm_inst *log_fi, |
| 1832 | struct msgb *l2, int *supports_osmux) |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1833 | { |
| 1834 | struct bssmap_header *bs = (struct bssmap_header *)msgb_l2(l2); |
| 1835 | |
Neels Hofmeyr | b697274 | 2020-06-26 15:20:51 +0200 | [diff] [blame] | 1836 | if (supports_osmux != NULL) |
| 1837 | *supports_osmux = 0; |
| 1838 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1839 | if (!bs |
| 1840 | || msgb_l2len(l2) < (sizeof(*bs) + 1) |
| 1841 | || bs->type != BSSAP_MSG_BSS_MANAGEMENT) |
| 1842 | return SCCP_RAN_MSG_NON_RESET; |
| 1843 | |
Neels Hofmeyr | b697274 | 2020-06-26 15:20:51 +0200 | [diff] [blame] | 1844 | l2->l3h = l2->l2h + sizeof(struct bssmap_header); |
| 1845 | |
| 1846 | switch (l2->l3h[0]) { |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1847 | case BSS_MAP_MSG_RESET: |
Neels Hofmeyr | b697274 | 2020-06-26 15:20:51 +0200 | [diff] [blame] | 1848 | cl_parse_osmux(log_fi, l2, supports_osmux); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1849 | return SCCP_RAN_MSG_RESET; |
| 1850 | case BSS_MAP_MSG_RESET_ACKNOWLEDGE: |
Neels Hofmeyr | b697274 | 2020-06-26 15:20:51 +0200 | [diff] [blame] | 1851 | cl_parse_osmux(log_fi, l2, supports_osmux); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1852 | return SCCP_RAN_MSG_RESET_ACK; |
| 1853 | default: |
| 1854 | return SCCP_RAN_MSG_NON_RESET; |
| 1855 | } |
| 1856 | } |
| 1857 | |
Pau Espin Pedrol | c9ba754 | 2019-05-07 12:23:49 +0200 | [diff] [blame] | 1858 | /* Patch regular BSSMAP RESET to add extra T to announce Osmux support (osmocom extension) */ |
| 1859 | static void _gsm0808_extend_announce_osmux(struct msgb *msg) |
| 1860 | { |
| 1861 | OSMO_ASSERT(msg->l3h[1] == msgb_l3len(msg) - 2); /*TL not in len */ |
| 1862 | msgb_put_u8(msg, GSM0808_IE_OSMO_OSMUX_SUPPORT); |
| 1863 | msg->l3h[1] = msgb_l3len(msg) - 2; |
| 1864 | } |
| 1865 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1866 | struct msgb *bssmap_make_reset_msg(const struct sccp_ran_inst *sri, enum reset_msg_type type) |
| 1867 | { |
Pau Espin Pedrol | c9ba754 | 2019-05-07 12:23:49 +0200 | [diff] [blame] | 1868 | struct gsm_network *net = sri->user_data; |
| 1869 | struct msgb *msg; |
| 1870 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1871 | switch (type) { |
| 1872 | case SCCP_RAN_MSG_RESET: |
Pau Espin Pedrol | c9ba754 | 2019-05-07 12:23:49 +0200 | [diff] [blame] | 1873 | msg = gsm0808_create_reset(); |
| 1874 | break; |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1875 | case SCCP_RAN_MSG_RESET_ACK: |
Pau Espin Pedrol | c9ba754 | 2019-05-07 12:23:49 +0200 | [diff] [blame] | 1876 | msg = gsm0808_create_reset_ack(); |
| 1877 | break; |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1878 | default: |
| 1879 | return NULL; |
| 1880 | } |
Pau Espin Pedrol | c9ba754 | 2019-05-07 12:23:49 +0200 | [diff] [blame] | 1881 | |
| 1882 | if (!msg) |
| 1883 | return NULL; |
| 1884 | |
| 1885 | if (net->use_osmux != OSMUX_USAGE_OFF) |
| 1886 | _gsm0808_extend_announce_osmux(msg); |
| 1887 | |
| 1888 | return msg; |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1889 | } |
| 1890 | |
| 1891 | struct msgb *bssmap_make_paging_msg(const struct sccp_ran_inst *sri, const struct gsm0808_cell_id *page_cell_id, |
| 1892 | const char *imsi, uint32_t tmsi, enum paging_cause cause) |
| 1893 | { |
| 1894 | struct gsm0808_cell_id_list2 cil; |
| 1895 | gsm0808_cell_id_to_list(&cil, page_cell_id); |
| 1896 | return gsm0808_create_paging2(imsi, tmsi == GSM_RESERVED_TMSI ? NULL : &tmsi, &cil, NULL); |
| 1897 | } |
| 1898 | |
| 1899 | const char *bssmap_msg_name(const struct sccp_ran_inst *sri, const struct msgb *l2) |
| 1900 | { |
| 1901 | struct bssmap_header *bs; |
| 1902 | |
| 1903 | if (!l2->l2h) |
| 1904 | return "?"; |
| 1905 | |
| 1906 | bs = (struct bssmap_header *)msgb_l2(l2); |
| 1907 | switch (bs->type) { |
| 1908 | case BSSAP_MSG_BSS_MANAGEMENT: |
| 1909 | return gsm0808_bssmap_name(l2->l2h[0]); |
| 1910 | case BSSAP_MSG_DTAP: |
| 1911 | return "DTAP"; |
| 1912 | default: |
| 1913 | return "?"; |
| 1914 | } |
| 1915 | } |