Harald Welte | f3f9002 | 2010-04-30 14:29:56 +0200 | [diff] [blame] | 1 | /* (C) 2009,2010 by Holger Hans Peter Freyther <zecke@selfish.org> |
| 2 | * (C) 2009,2010 by On-Waves |
| 3 | * All Rights Reserved |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License along |
| 16 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 | * |
| 19 | */ |
| 20 | |
| 21 | #include <osmocore/gsm0808.h> |
| 22 | #include <osmocore/protocol/gsm_08_08.h> |
| 23 | #include <osmocore/gsm48.h> |
| 24 | |
| 25 | #include <arpa/inet.h> |
| 26 | |
| 27 | #define BSSMAP_MSG_SIZE 512 |
| 28 | #define BSSMAP_MSG_HEADROOM 128 |
| 29 | |
| 30 | struct msgb *gsm0808_create_layer3(struct msgb *msg_l3, uint16_t nc, uint16_t cc, int lac, int _ci) |
| 31 | { |
| 32 | uint8_t *data; |
| 33 | uint16_t *ci; |
| 34 | struct msgb* msg; |
| 35 | struct gsm48_loc_area_id *lai; |
| 36 | |
| 37 | msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM, |
| 38 | "bssmap cmpl l3"); |
| 39 | if (!msg) |
| 40 | return NULL; |
| 41 | |
| 42 | /* create the bssmap header */ |
| 43 | msg->l3h = msgb_put(msg, 2); |
| 44 | msg->l3h[0] = 0x0; |
| 45 | |
| 46 | /* create layer 3 header */ |
| 47 | data = msgb_put(msg, 1); |
| 48 | data[0] = BSS_MAP_MSG_COMPLETE_LAYER_3; |
| 49 | |
| 50 | /* create the cell header */ |
| 51 | data = msgb_put(msg, 3); |
| 52 | data[0] = GSM0808_IE_CELL_IDENTIFIER; |
| 53 | data[1] = 1 + sizeof(*lai) + 2; |
| 54 | data[2] = CELL_IDENT_WHOLE_GLOBAL; |
| 55 | |
| 56 | lai = (struct gsm48_loc_area_id *) msgb_put(msg, sizeof(*lai)); |
| 57 | gsm48_generate_lai(lai, cc, nc, lac); |
| 58 | |
| 59 | ci = (uint16_t *) msgb_put(msg, 2); |
| 60 | *ci = htons(_ci); |
| 61 | |
| 62 | /* copy the layer3 data */ |
| 63 | data = msgb_put(msg, msgb_l3len(msg_l3) + 2); |
| 64 | data[0] = GSM0808_IE_LAYER_3_INFORMATION; |
| 65 | data[1] = msgb_l3len(msg_l3); |
| 66 | memcpy(&data[2], msg_l3->l3h, data[1]); |
| 67 | |
| 68 | /* update the size */ |
| 69 | msg->l3h[1] = msgb_l3len(msg) - 2; |
| 70 | |
| 71 | return msg; |
| 72 | } |
| 73 | |
| 74 | struct msgb *gsm0808_create_reset(void) |
| 75 | { |
| 76 | struct msgb *msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM, |
| 77 | "bssmap: reset"); |
| 78 | if (!msg) |
| 79 | return NULL; |
| 80 | |
| 81 | msg->l3h = msgb_put(msg, 6); |
| 82 | msg->l3h[0] = BSSAP_MSG_BSS_MANAGEMENT; |
| 83 | msg->l3h[1] = 0x04; |
| 84 | msg->l3h[2] = 0x30; |
| 85 | msg->l3h[3] = 0x04; |
| 86 | msg->l3h[4] = 0x01; |
| 87 | msg->l3h[5] = 0x20; |
| 88 | return msg; |
| 89 | } |
| 90 | |
| 91 | struct msgb *gsm0808_create_clear_complete(void) |
| 92 | { |
| 93 | struct msgb *msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM, |
| 94 | "bssmap: clear complete"); |
| 95 | if (!msg) |
| 96 | return NULL; |
| 97 | |
| 98 | msg->l3h = msgb_put(msg, 3); |
| 99 | msg->l3h[0] = BSSAP_MSG_BSS_MANAGEMENT; |
| 100 | msg->l3h[1] = 1; |
| 101 | msg->l3h[2] = BSS_MAP_MSG_CLEAR_COMPLETE; |
| 102 | |
| 103 | return msg; |
| 104 | } |
| 105 | |
| 106 | struct msgb *gsm0808_create_cipher_complete(struct msgb *layer3, uint8_t alg_id) |
| 107 | { |
| 108 | struct msgb *msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM, |
| 109 | "cipher-complete"); |
| 110 | if (!msg) |
| 111 | return NULL; |
| 112 | |
| 113 | /* send response with BSS override for A5/1... cheating */ |
| 114 | msg->l3h = msgb_put(msg, 3); |
| 115 | msg->l3h[0] = BSSAP_MSG_BSS_MANAGEMENT; |
| 116 | msg->l3h[1] = 0xff; |
| 117 | msg->l3h[2] = BSS_MAP_MSG_CIPHER_MODE_COMPLETE; |
| 118 | |
| 119 | /* include layer3 in case we have at least two octets */ |
| 120 | if (layer3 && msgb_l3len(layer3) > 2) { |
| 121 | msg->l4h = msgb_put(msg, msgb_l3len(layer3) + 2); |
| 122 | msg->l4h[0] = GSM0808_IE_LAYER_3_MESSAGE_CONTENTS; |
| 123 | msg->l4h[1] = msgb_l3len(layer3); |
| 124 | memcpy(&msg->l4h[2], layer3->l3h, msgb_l3len(layer3)); |
| 125 | } |
| 126 | |
| 127 | /* and the optional BSS message */ |
| 128 | msg->l4h = msgb_put(msg, 2); |
| 129 | msg->l4h[0] = GSM0808_IE_CHOSEN_ENCR_ALG; |
| 130 | msg->l4h[1] = alg_id; |
| 131 | |
| 132 | /* update the size */ |
| 133 | msg->l3h[1] = msgb_l3len(msg) - 2; |
| 134 | return msg; |
| 135 | } |
| 136 | |
| 137 | struct msgb *gsm0808_create_cipher_reject(uint8_t cause) |
| 138 | { |
| 139 | struct msgb *msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM, |
| 140 | "bssmap: clear complete"); |
| 141 | if (!msg) |
| 142 | return NULL; |
| 143 | |
| 144 | msg->l3h = msgb_put(msg, 3); |
| 145 | msg->l3h[0] = BSSAP_MSG_BSS_MANAGEMENT; |
| 146 | msg->l3h[1] = 2; |
| 147 | msg->l3h[2] = BSS_MAP_MSG_CIPHER_MODE_REJECT; |
| 148 | msg->l3h[3] = cause; |
| 149 | |
| 150 | return msg; |
| 151 | } |
| 152 | |
| 153 | struct msgb *gsm0808_create_classmark_update(const uint8_t *classmark_data, uint8_t length) |
| 154 | { |
| 155 | struct msgb *msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM, |
| 156 | "classmark-update"); |
| 157 | if (!msg) |
| 158 | return NULL; |
| 159 | |
| 160 | msg->l3h = msgb_put(msg, 3); |
| 161 | msg->l3h[0] = BSSAP_MSG_BSS_MANAGEMENT; |
| 162 | msg->l3h[1] = 0xff; |
| 163 | msg->l3h[2] = BSS_MAP_MSG_CLASSMARK_UPDATE; |
| 164 | |
| 165 | msg->l4h = msgb_put(msg, length); |
| 166 | memcpy(msg->l4h, classmark_data, length); |
| 167 | |
| 168 | /* update the size */ |
| 169 | msg->l3h[1] = msgb_l3len(msg) - 2; |
| 170 | return msg; |
| 171 | } |
| 172 | |
| 173 | struct msgb *gsm0808_create_sapi_reject(uint8_t link_id) |
| 174 | { |
| 175 | struct msgb *msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM, |
| 176 | "bssmap: sapi 'n' reject"); |
| 177 | if (!msg) |
| 178 | return NULL; |
| 179 | |
| 180 | msg->l3h = msgb_put(msg, 5); |
| 181 | msg->l3h[0] = BSSAP_MSG_BSS_MANAGEMENT; |
| 182 | msg->l3h[1] = 3; |
| 183 | msg->l3h[2] = BSS_MAP_MSG_SAPI_N_REJECT; |
| 184 | msg->l3h[3] = link_id; |
| 185 | msg->l3h[4] = GSM0808_CAUSE_BSS_NOT_EQUIPPED; |
| 186 | |
| 187 | return msg; |
| 188 | } |
| 189 | |
| 190 | struct msgb *gsm0808_create_assignment_completed(struct gsm_lchan *lchan, uint8_t rr_cause, |
| 191 | uint8_t chosen_channel, uint8_t encr_alg_id, |
| 192 | uint8_t speech_mode) |
| 193 | { |
| 194 | uint8_t *data; |
| 195 | |
| 196 | struct msgb *msg = msgb_alloc(35, "bssmap: ass compl"); |
| 197 | if (!msg) |
| 198 | return NULL; |
| 199 | |
| 200 | msg->l3h = msgb_put(msg, 3); |
| 201 | msg->l3h[0] = BSSAP_MSG_BSS_MANAGEMENT; |
| 202 | msg->l3h[1] = 0xff; |
| 203 | msg->l3h[2] = BSS_MAP_MSG_ASSIGMENT_COMPLETE; |
| 204 | |
| 205 | /* write 3.2.2.22 */ |
| 206 | data = msgb_put(msg, 2); |
| 207 | data[0] = GSM0808_IE_RR_CAUSE; |
| 208 | data[1] = rr_cause; |
| 209 | |
| 210 | /* write cirtcuit identity code 3.2.2.2 */ |
| 211 | /* write cell identifier 3.2.2.17 */ |
| 212 | /* write chosen channel 3.2.2.33 when BTS picked it */ |
| 213 | data = msgb_put(msg, 2); |
| 214 | data[0] = GSM0808_IE_CHOSEN_CHANNEL; |
| 215 | data[1] = chosen_channel; |
| 216 | |
| 217 | /* write chosen encryption algorithm 3.2.2.44 */ |
| 218 | data = msgb_put(msg, 2); |
| 219 | data[0] = GSM0808_IE_CHOSEN_ENCR_ALG; |
| 220 | data[1] = encr_alg_id; |
| 221 | |
| 222 | /* write circuit pool 3.2.2.45 */ |
| 223 | /* write speech version chosen: 3.2.2.51 when BTS picked it */ |
| 224 | if (speech_mode != 0) { |
| 225 | data = msgb_put(msg, 2); |
| 226 | data[0] = GSM0808_IE_SPEECH_VERSION; |
| 227 | data[1] = speech_mode; |
| 228 | } |
| 229 | |
| 230 | /* write LSA identifier 3.2.2.15 */ |
| 231 | |
| 232 | |
| 233 | /* update the size */ |
| 234 | msg->l3h[1] = msgb_l3len(msg) - 2; |
| 235 | return msg; |
| 236 | } |
| 237 | |
| 238 | struct msgb *gsm0808_create_assignment_failure(uint8_t cause, uint8_t *rr_cause) |
| 239 | { |
| 240 | uint8_t *data; |
| 241 | struct msgb *msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM, |
| 242 | "bssmap: ass fail"); |
| 243 | if (!msg) |
| 244 | return NULL; |
| 245 | |
| 246 | msg->l3h = msgb_put(msg, 6); |
| 247 | msg->l3h[0] = BSSAP_MSG_BSS_MANAGEMENT; |
| 248 | msg->l3h[1] = 0xff; |
| 249 | msg->l3h[2] = BSS_MAP_MSG_ASSIGMENT_FAILURE; |
| 250 | msg->l3h[3] = GSM0808_IE_CAUSE; |
| 251 | msg->l3h[4] = 1; |
| 252 | msg->l3h[5] = cause; |
| 253 | |
| 254 | /* RR cause 3.2.2.22 */ |
| 255 | if (rr_cause) { |
| 256 | data = msgb_put(msg, 2); |
| 257 | data[0] = GSM0808_IE_RR_CAUSE; |
| 258 | data[1] = *rr_cause; |
| 259 | } |
| 260 | |
| 261 | /* Circuit pool 3.22.45 */ |
| 262 | /* Circuit pool list 3.2.2.46 */ |
| 263 | |
| 264 | /* update the size */ |
| 265 | msg->l3h[1] = msgb_l3len(msg) - 2; |
| 266 | return msg; |
| 267 | } |
| 268 | |
| 269 | static const struct tlv_definition bss_att_tlvdef = { |
| 270 | .def = { |
| 271 | [GSM0808_IE_IMSI] = { TLV_TYPE_TLV }, |
| 272 | [GSM0808_IE_TMSI] = { TLV_TYPE_TLV }, |
| 273 | [GSM0808_IE_CELL_IDENTIFIER_LIST] = { TLV_TYPE_TLV }, |
| 274 | [GSM0808_IE_CHANNEL_NEEDED] = { TLV_TYPE_TV }, |
| 275 | [GSM0808_IE_EMLPP_PRIORITY] = { TLV_TYPE_TV }, |
| 276 | [GSM0808_IE_CHANNEL_TYPE] = { TLV_TYPE_TLV }, |
| 277 | [GSM0808_IE_PRIORITY] = { TLV_TYPE_TLV }, |
| 278 | [GSM0808_IE_CIRCUIT_IDENTITY_CODE] = { TLV_TYPE_TV }, |
| 279 | [GSM0808_IE_DOWNLINK_DTX_FLAG] = { TLV_TYPE_TV }, |
| 280 | [GSM0808_IE_INTERFERENCE_BAND_TO_USE] = { TLV_TYPE_TV }, |
| 281 | [GSM0808_IE_CLASSMARK_INFORMATION_T2] = { TLV_TYPE_TLV }, |
| 282 | [GSM0808_IE_GROUP_CALL_REFERENCE] = { TLV_TYPE_TLV }, |
| 283 | [GSM0808_IE_TALKER_FLAG] = { TLV_TYPE_T }, |
| 284 | [GSM0808_IE_CONFIG_EVO_INDI] = { TLV_TYPE_TV }, |
| 285 | [GSM0808_IE_LSA_ACCESS_CTRL_SUPPR] = { TLV_TYPE_TV }, |
| 286 | [GSM0808_IE_SERVICE_HANDOVER] = { TLV_TYPE_TV}, |
| 287 | [GSM0808_IE_ENCRYPTION_INFORMATION] = { TLV_TYPE_TLV }, |
| 288 | [GSM0808_IE_CIPHER_RESPONSE_MODE] = { TLV_TYPE_TV }, |
| 289 | }, |
| 290 | }; |
| 291 | |
| 292 | const struct tlv_definition *gsm0808_att_tlvdef() |
| 293 | { |
| 294 | return &bss_att_tlvdef; |
| 295 | } |