Harald Welte | c436245 | 2010-03-22 22:25:13 +0800 | [diff] [blame^] | 1 | /* GSM Radio Signalling Link messages on the A-bis interface |
| 2 | * 3GPP TS 08.58 version 8.6.0 Release 1999 / ETSI TS 100 596 V8.6.0 */ |
| 3 | |
| 4 | /* (C) 2008-2010 by Harald Welte <laforge@gnumonks.org> |
| 5 | * |
| 6 | * All Rights Reserved |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License along |
| 19 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 20 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 21 | * |
| 22 | */ |
| 23 | |
| 24 | #include <stdint.h> |
| 25 | #include <errno.h> |
| 26 | |
| 27 | #include <osmocore/tlv.h> |
| 28 | #include <osmocore/rsl.h> |
| 29 | |
| 30 | #define RSL_ALLOC_SIZE 200 |
| 31 | #define RSL_ALLOC_HEADROOM 56 |
| 32 | |
| 33 | void rsl_init_rll_hdr(struct abis_rsl_rll_hdr *dh, uint8_t msg_type) |
| 34 | { |
| 35 | dh->c.msg_discr = ABIS_RSL_MDISC_RLL; |
| 36 | dh->c.msg_type = msg_type; |
| 37 | dh->ie_chan = RSL_IE_CHAN_NR; |
| 38 | dh->ie_link_id = RSL_IE_LINK_IDENT; |
| 39 | } |
| 40 | |
| 41 | const struct tlv_definition rsl_att_tlvdef = { |
| 42 | .def = { |
| 43 | [RSL_IE_CHAN_NR] = { TLV_TYPE_TV }, |
| 44 | [RSL_IE_LINK_IDENT] = { TLV_TYPE_TV }, |
| 45 | [RSL_IE_ACT_TYPE] = { TLV_TYPE_TV }, |
| 46 | [RSL_IE_BS_POWER] = { TLV_TYPE_TV }, |
| 47 | [RSL_IE_CHAN_IDENT] = { TLV_TYPE_TLV }, |
| 48 | [RSL_IE_CHAN_MODE] = { TLV_TYPE_TLV }, |
| 49 | [RSL_IE_ENCR_INFO] = { TLV_TYPE_TLV }, |
| 50 | [RSL_IE_FRAME_NUMBER] = { TLV_TYPE_FIXED, 2 }, |
| 51 | [RSL_IE_HANDO_REF] = { TLV_TYPE_TV }, |
| 52 | [RSL_IE_L1_INFO] = { TLV_TYPE_FIXED, 2 }, |
| 53 | [RSL_IE_L3_INFO] = { TLV_TYPE_TL16V }, |
| 54 | [RSL_IE_MS_IDENTITY] = { TLV_TYPE_TLV }, |
| 55 | [RSL_IE_MS_POWER] = { TLV_TYPE_TV }, |
| 56 | [RSL_IE_PAGING_GROUP] = { TLV_TYPE_TV }, |
| 57 | [RSL_IE_PAGING_LOAD] = { TLV_TYPE_FIXED, 2 }, |
| 58 | [RSL_IE_PYHS_CONTEXT] = { TLV_TYPE_TLV }, |
| 59 | [RSL_IE_ACCESS_DELAY] = { TLV_TYPE_TV }, |
| 60 | [RSL_IE_RACH_LOAD] = { TLV_TYPE_TLV }, |
| 61 | [RSL_IE_REQ_REFERENCE] = { TLV_TYPE_FIXED, 3 }, |
| 62 | [RSL_IE_RELEASE_MODE] = { TLV_TYPE_TV }, |
| 63 | [RSL_IE_RESOURCE_INFO] = { TLV_TYPE_TLV }, |
| 64 | [RSL_IE_RLM_CAUSE] = { TLV_TYPE_TLV }, |
| 65 | [RSL_IE_STARTNG_TIME] = { TLV_TYPE_FIXED, 2 }, |
| 66 | [RSL_IE_TIMING_ADVANCE] = { TLV_TYPE_TV }, |
| 67 | [RSL_IE_UPLINK_MEAS] = { TLV_TYPE_TLV }, |
| 68 | [RSL_IE_CAUSE] = { TLV_TYPE_TLV }, |
| 69 | [RSL_IE_MEAS_RES_NR] = { TLV_TYPE_TV }, |
| 70 | [RSL_IE_MSG_ID] = { TLV_TYPE_TV }, |
| 71 | [RSL_IE_SYSINFO_TYPE] = { TLV_TYPE_TV }, |
| 72 | [RSL_IE_MS_POWER_PARAM] = { TLV_TYPE_TLV }, |
| 73 | [RSL_IE_BS_POWER_PARAM] = { TLV_TYPE_TLV }, |
| 74 | [RSL_IE_PREPROC_PARAM] = { TLV_TYPE_TLV }, |
| 75 | [RSL_IE_PREPROC_MEAS] = { TLV_TYPE_TLV }, |
| 76 | [RSL_IE_IMM_ASS_INFO] = { TLV_TYPE_TLV }, |
| 77 | [RSL_IE_SMSCB_INFO] = { TLV_TYPE_FIXED, 23 }, |
| 78 | [RSL_IE_MS_TIMING_OFFSET] = { TLV_TYPE_TV }, |
| 79 | [RSL_IE_ERR_MSG] = { TLV_TYPE_TLV }, |
| 80 | [RSL_IE_FULL_BCCH_INFO] = { TLV_TYPE_TLV }, |
| 81 | [RSL_IE_CHAN_NEEDED] = { TLV_TYPE_TV }, |
| 82 | [RSL_IE_CB_CMD_TYPE] = { TLV_TYPE_TV }, |
| 83 | [RSL_IE_SMSCB_MSG] = { TLV_TYPE_TLV }, |
| 84 | [RSL_IE_FULL_IMM_ASS_INFO] = { TLV_TYPE_TLV }, |
| 85 | [RSL_IE_SACCH_INFO] = { TLV_TYPE_TLV }, |
| 86 | [RSL_IE_CBCH_LOAD_INFO] = { TLV_TYPE_TV }, |
| 87 | [RSL_IE_SMSCB_CHAN_INDICATOR] = { TLV_TYPE_TV }, |
| 88 | [RSL_IE_GROUP_CALL_REF] = { TLV_TYPE_TLV }, |
| 89 | [RSL_IE_CHAN_DESC] = { TLV_TYPE_TLV }, |
| 90 | [RSL_IE_NCH_DRX_INFO] = { TLV_TYPE_TLV }, |
| 91 | [RSL_IE_CMD_INDICATOR] = { TLV_TYPE_TLV }, |
| 92 | [RSL_IE_EMLPP_PRIO] = { TLV_TYPE_TV }, |
| 93 | [RSL_IE_UIC] = { TLV_TYPE_TLV }, |
| 94 | [RSL_IE_MAIN_CHAN_REF] = { TLV_TYPE_TV }, |
| 95 | [RSL_IE_MR_CONFIG] = { TLV_TYPE_TLV }, |
| 96 | [RSL_IE_MR_CONTROL] = { TLV_TYPE_TV }, |
| 97 | [RSL_IE_SUP_CODEC_TYPES] = { TLV_TYPE_TLV }, |
| 98 | [RSL_IE_CODEC_CONFIG] = { TLV_TYPE_TLV }, |
| 99 | [RSL_IE_RTD] = { TLV_TYPE_TV }, |
| 100 | [RSL_IE_TFO_STATUS] = { TLV_TYPE_TV }, |
| 101 | [RSL_IE_LLP_APDU] = { TLV_TYPE_TLV }, |
| 102 | [RSL_IE_SIEMENS_MRPCI] = { TLV_TYPE_TV }, |
| 103 | [RSL_IE_IPAC_PROXY_UDP] = { TLV_TYPE_FIXED, 2 }, |
| 104 | [RSL_IE_IPAC_BSCMPL_TOUT] = { TLV_TYPE_TV }, |
| 105 | [RSL_IE_IPAC_REMOTE_IP] = { TLV_TYPE_FIXED, 4 }, |
| 106 | [RSL_IE_IPAC_REMOTE_PORT] = { TLV_TYPE_FIXED, 2 }, |
| 107 | [RSL_IE_IPAC_RTP_PAYLOAD] = { TLV_TYPE_TV }, |
| 108 | [RSL_IE_IPAC_LOCAL_PORT] = { TLV_TYPE_FIXED, 2 }, |
| 109 | [RSL_IE_IPAC_SPEECH_MODE] = { TLV_TYPE_TV }, |
| 110 | [RSL_IE_IPAC_LOCAL_IP] = { TLV_TYPE_FIXED, 4 }, |
| 111 | [RSL_IE_IPAC_CONN_ID] = { TLV_TYPE_FIXED, 2 }, |
| 112 | [RSL_IE_IPAC_RTP_CSD_FMT] = { TLV_TYPE_TV }, |
| 113 | [RSL_IE_IPAC_RTP_JIT_BUF] = { TLV_TYPE_FIXED, 2 }, |
| 114 | [RSL_IE_IPAC_RTP_COMPR] = { TLV_TYPE_TV }, |
| 115 | [RSL_IE_IPAC_RTP_PAYLOAD2] = { TLV_TYPE_TV }, |
| 116 | [RSL_IE_IPAC_RTP_MPLEX] = { TLV_TYPE_FIXED, 8 }, |
| 117 | [RSL_IE_IPAC_RTP_MPLEX_ID] = { TLV_TYPE_TV }, |
| 118 | }, |
| 119 | }; |
| 120 | |
| 121 | /* encode channel number as per Section 9.3.1 */ |
| 122 | uint8_t rsl_enc_chan_nr(uint8_t type, uint8_t subch, uint8_t timeslot) |
| 123 | { |
| 124 | uint8_t ret; |
| 125 | |
| 126 | ret = (timeslot & 0x07) | type; |
| 127 | |
| 128 | switch (type) { |
| 129 | case RSL_CHAN_Lm_ACCHs: |
| 130 | subch &= 0x01; |
| 131 | break; |
| 132 | case RSL_CHAN_SDCCH4_ACCH: |
| 133 | subch &= 0x03; |
| 134 | break; |
| 135 | case RSL_CHAN_SDCCH8_ACCH: |
| 136 | subch &= 0x07; |
| 137 | break; |
| 138 | default: |
| 139 | /* no subchannels allowed */ |
| 140 | subch = 0x00; |
| 141 | break; |
| 142 | } |
| 143 | ret |= (subch << 3); |
| 144 | |
| 145 | return ret; |
| 146 | } |
| 147 | |
| 148 | int rsl_dec_chan_nr(uint8_t chan_nr, uint8_t *type, uint8_t *subch, uint8_t *timeslot) |
| 149 | { |
| 150 | *timeslot = chan_nr & 0x7; |
| 151 | |
| 152 | if ((chan_nr & 0xf8) == RSL_CHAN_Bm_ACCHs) { |
| 153 | *type = RSL_CHAN_Bm_ACCHs; |
| 154 | *subch = 0; |
| 155 | } else if ((chan_nr & 0xf0) == RSL_CHAN_Lm_ACCHs) { |
| 156 | *type = RSL_CHAN_Lm_ACCHs; |
| 157 | *subch = (chan_nr >> 3) & 0x1; |
| 158 | } else if ((chan_nr & 0xe0) == RSL_CHAN_SDCCH4_ACCH) { |
| 159 | *type = RSL_CHAN_SDCCH4_ACCH; |
| 160 | *subch = (chan_nr >> 3) & 0x3; |
| 161 | } else if ((chan_nr & 0xc0) == RSL_CHAN_SDCCH8_ACCH) { |
| 162 | *type = RSL_CHAN_SDCCH8_ACCH; |
| 163 | *subch = (chan_nr >> 3) & 0x7; |
| 164 | } else if ((chan_nr & 0xf8) == RSL_CHAN_BCCH) { |
| 165 | *type = RSL_CHAN_BCCH; |
| 166 | *subch = 0; |
| 167 | } else if ((chan_nr & 0xf8) == RSL_CHAN_RACH) { |
| 168 | *type = RSL_CHAN_RACH; |
| 169 | *subch = 0; |
| 170 | } else if ((chan_nr & 0xf8) == RSL_CHAN_PCH_AGCH) { |
| 171 | *type = RSL_CHAN_PCH_AGCH; |
| 172 | *subch = 0; |
| 173 | } else |
| 174 | return -EINVAL; |
| 175 | |
| 176 | return 0; |
| 177 | } |
| 178 | |
| 179 | /* FIXME: convert to value_string */ |
| 180 | static const char *rsl_err_vals[0xff] = { |
| 181 | [RSL_ERR_RADIO_IF_FAIL] = "Radio Interface Failure", |
| 182 | [RSL_ERR_RADIO_LINK_FAIL] = "Radio Link Failure", |
| 183 | [RSL_ERR_HANDOVER_ACC_FAIL] = "Handover Access Failure", |
| 184 | [RSL_ERR_TALKER_ACC_FAIL] = "Talker Access Failure", |
| 185 | [RSL_ERR_OM_INTERVENTION] = "O&M Intervention", |
| 186 | [RSL_ERR_NORMAL_UNSPEC] = "Normal event, unspecified", |
| 187 | [RSL_ERR_T_MSRFPCI_EXP] = "Siemens: T_MSRFPCI Expired", |
| 188 | [RSL_ERR_EQUIPMENT_FAIL] = "Equipment Failure", |
| 189 | [RSL_ERR_RR_UNAVAIL] = "Radio Resource not available", |
| 190 | [RSL_ERR_TERR_CH_FAIL] = "Terrestrial Channel Failure", |
| 191 | [RSL_ERR_CCCH_OVERLOAD] = "CCCH Overload", |
| 192 | [RSL_ERR_ACCH_OVERLOAD] = "ACCH Overload", |
| 193 | [RSL_ERR_PROCESSOR_OVERLOAD] = "Processor Overload", |
| 194 | [RSL_ERR_RES_UNAVAIL] = "Resource not available, unspecified", |
| 195 | [RSL_ERR_TRANSC_UNAVAIL] = "Transcoding not available", |
| 196 | [RSL_ERR_SERV_OPT_UNAVAIL] = "Service or Option not available", |
| 197 | [RSL_ERR_ENCR_UNIMPL] = "Encryption algorithm not implemented", |
| 198 | [RSL_ERR_SERV_OPT_UNIMPL] = "Service or Option not implemented", |
| 199 | [RSL_ERR_RCH_ALR_ACTV_ALLOC] = "Radio channel already activated", |
| 200 | [RSL_ERR_INVALID_MESSAGE] = "Invalid Message, unspecified", |
| 201 | [RSL_ERR_MSG_DISCR] = "Message Discriminator Error", |
| 202 | [RSL_ERR_MSG_TYPE] = "Message Type Error", |
| 203 | [RSL_ERR_MSG_SEQ] = "Message Sequence Error", |
| 204 | [RSL_ERR_IE_ERROR] = "General IE error", |
| 205 | [RSL_ERR_MAND_IE_ERROR] = "Mandatory IE error", |
| 206 | [RSL_ERR_OPT_IE_ERROR] = "Optional IE error", |
| 207 | [RSL_ERR_IE_NONEXIST] = "IE non-existent", |
| 208 | [RSL_ERR_IE_LENGTH] = "IE length error", |
| 209 | [RSL_ERR_IE_CONTENT] = "IE content error", |
| 210 | [RSL_ERR_PROTO] = "Protocol error, unspecified", |
| 211 | [RSL_ERR_INTERWORKING] = "Interworking error, unspecified", |
| 212 | }; |
| 213 | |
| 214 | const struct value_string rsl_rlm_cause_strs[] = { |
| 215 | { RLL_CAUSE_T200_EXPIRED, "Timer T200 expired (N200+1) times" }, |
| 216 | { RLL_CAUSE_REEST_REQ, "Re-establishment request" }, |
| 217 | { RLL_CAUSE_UNSOL_UA_RESP, "Unsolicited UA response" }, |
| 218 | { RLL_CAUSE_UNSOL_DM_RESP, "Unsolicited DM response" }, |
| 219 | { RLL_CAUSE_UNSOL_DM_RESP_MF, "Unsolicited DM response, multiple frame" }, |
| 220 | { RLL_CAUSE_UNSOL_SPRV_RESP, "Unsolicited supervisory response" }, |
| 221 | { RLL_CAUSE_SEQ_ERR, "Sequence Error" }, |
| 222 | { RLL_CAUSE_UFRM_INC_PARAM, "U-Frame with incorrect parameters" }, |
| 223 | { RLL_CAUSE_SFRM_INC_PARAM, "S-Frame with incorrect parameters" }, |
| 224 | { RLL_CAUSE_IFRM_INC_MBITS, "I-Frame with incorrect use of M bit" }, |
| 225 | { RLL_CAUSE_IFRM_INC_LEN, "I-Frame with incorrect length" }, |
| 226 | { RLL_CAUSE_FRM_UNIMPL, "Fraeme not implemented" }, |
| 227 | { RLL_CAUSE_SABM_MF, "SABM command, multiple frame established state" }, |
| 228 | { RLL_CAUSE_SABM_INFO_NOTALL, "SABM frame with information not allowed in this state" }, |
| 229 | { 0, NULL }, |
| 230 | }; |
| 231 | |
| 232 | const char *rsl_err_name(uint8_t err) |
| 233 | { |
| 234 | if (rsl_err_vals[err]) |
| 235 | return rsl_err_vals[err]; |
| 236 | else |
| 237 | return "unknown"; |
| 238 | } |
| 239 | |
| 240 | /* Section 3.3.2.3 TS 05.02. I think this looks like a table */ |
| 241 | int rsl_ccch_conf_to_bs_cc_chans(int ccch_conf) |
| 242 | { |
| 243 | switch (ccch_conf) { |
| 244 | case RSL_BCCH_CCCH_CONF_1_NC: |
| 245 | return 1; |
| 246 | case RSL_BCCH_CCCH_CONF_1_C: |
| 247 | return 1; |
| 248 | case RSL_BCCH_CCCH_CONF_2_NC: |
| 249 | return 2; |
| 250 | case RSL_BCCH_CCCH_CONF_3_NC: |
| 251 | return 3; |
| 252 | case RSL_BCCH_CCCH_CONF_4_NC: |
| 253 | return 4; |
| 254 | default: |
| 255 | return -1; |
| 256 | } |
| 257 | } |
| 258 | |
| 259 | /* Section 3.3.2.3 TS 05.02 */ |
| 260 | int rsl_ccch_conf_to_bs_ccch_sdcch_comb(int ccch_conf) |
| 261 | { |
| 262 | switch (ccch_conf) { |
| 263 | case RSL_BCCH_CCCH_CONF_1_NC: |
| 264 | return 0; |
| 265 | case RSL_BCCH_CCCH_CONF_1_C: |
| 266 | return 1; |
| 267 | case RSL_BCCH_CCCH_CONF_2_NC: |
| 268 | return 0; |
| 269 | case RSL_BCCH_CCCH_CONF_3_NC: |
| 270 | return 0; |
| 271 | case RSL_BCCH_CCCH_CONF_4_NC: |
| 272 | return 0; |
| 273 | default: |
| 274 | return -1; |
| 275 | } |
| 276 | } |
| 277 | |
| 278 | /* Push a RSL RLL header with L3_INFO IE */ |
| 279 | void rsl_rll_push_l3(struct msgb *msg, uint8_t msg_type, uint8_t chan_nr, |
| 280 | uint8_t link_id, int transparent) |
| 281 | { |
| 282 | uint8_t l3_len = msg->tail - (uint8_t *)msgb_l3(msg); |
| 283 | struct abis_rsl_rll_hdr *rh; |
| 284 | |
| 285 | /* construct a RSLms RLL message (DATA INDICATION, UNIT DATA |
| 286 | * INDICATION) and send it off via RSLms */ |
| 287 | |
| 288 | /* Push the L3 IE tag and lengh */ |
| 289 | msgb_tv16_push(msg, RSL_IE_L3_INFO, l3_len); |
| 290 | |
| 291 | /* Then push the RSL header */ |
| 292 | rh = (struct abis_rsl_rll_hdr *) msgb_push(msg, sizeof(*rh)); |
| 293 | rsl_init_rll_hdr(rh, msg_type); |
| 294 | if (transparent) |
| 295 | rh->c.msg_discr |= ABIS_RSL_MDISC_TRANSP; |
| 296 | rh->chan_nr = chan_nr; |
| 297 | rh->link_id = link_id; |
| 298 | |
| 299 | /* set the l2 header pointer */ |
| 300 | msg->l2h = (uint8_t *)rh; |
| 301 | } |
| 302 | |
| 303 | struct msgb *rsl_rll_simple(uint8_t msg_type, uint8_t chan_nr, |
| 304 | uint8_t link_id, int transparent) |
| 305 | { |
| 306 | struct abis_rsl_rll_hdr *rh; |
| 307 | struct msgb *msg; |
| 308 | |
| 309 | msg = msgb_alloc_headroom(RSL_ALLOC_SIZE+RSL_ALLOC_HEADROOM, |
| 310 | RSL_ALLOC_HEADROOM, "rsl_rll_simple"); |
| 311 | |
| 312 | if (!msg) |
| 313 | return NULL; |
| 314 | |
| 315 | /* put the RSL header */ |
| 316 | rh = (struct abis_rsl_rll_hdr *) msgb_put(msg, sizeof(*rh)); |
| 317 | rsl_init_rll_hdr(rh, msg_type); |
| 318 | if (transparent) |
| 319 | rh->c.msg_discr |= ABIS_RSL_MDISC_TRANSP; |
| 320 | rh->chan_nr = chan_nr; |
| 321 | rh->link_id = link_id; |
| 322 | |
| 323 | /* set the l2 header pointer */ |
| 324 | msg->l2h = (uint8_t *)rh; |
| 325 | |
| 326 | return msg; |
| 327 | } |