src/rsl.c

   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) 2008-2009 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 <osmocore/tlv.h>
  25 #include <osmocore/rsl.h>
  26
  27 void rsl_init_rll_hdr(struct abis_rsl_rll_hdr *dh, uint8_t msg_type)
  28 {
  29         dh->c.msg_discr = ABIS_RSL_MDISC_RLL;
  30         dh->c.msg_type = msg_type;
  31         dh->ie_chan = RSL_IE_CHAN_NR;
  32         dh->ie_link_id = RSL_IE_LINK_IDENT;
  33 }
  34
  35 const struct tlv_definition rsl_att_tlvdef = {
  36         .def = {
  37                 [RSL_IE_CHAN_NR]                = { TLV_TYPE_TV },
  38                 [RSL_IE_LINK_IDENT]             = { TLV_TYPE_TV },
  39                 [RSL_IE_ACT_TYPE]               = { TLV_TYPE_TV },
  40                 [RSL_IE_BS_POWER]               = { TLV_TYPE_TV },
  41                 [RSL_IE_CHAN_IDENT]             = { TLV_TYPE_TLV },
  42                 [RSL_IE_CHAN_MODE]              = { TLV_TYPE_TLV },
  43                 [RSL_IE_ENCR_INFO]              = { TLV_TYPE_TLV },
  44                 [RSL_IE_FRAME_NUMBER]           = { TLV_TYPE_FIXED, 2 },
  45                 [RSL_IE_HANDO_REF]              = { TLV_TYPE_TV },
  46                 [RSL_IE_L1_INFO]                = { TLV_TYPE_FIXED, 2 },
  47                 [RSL_IE_L3_INFO]                = { TLV_TYPE_TL16V },
  48                 [RSL_IE_MS_IDENTITY]            = { TLV_TYPE_TLV },
  49                 [RSL_IE_MS_POWER]               = { TLV_TYPE_TV },
  50                 [RSL_IE_PAGING_GROUP]           = { TLV_TYPE_TV },
  51                 [RSL_IE_PAGING_LOAD]            = { TLV_TYPE_FIXED, 2 },
  52                 [RSL_IE_PYHS_CONTEXT]           = { TLV_TYPE_TLV },
  53                 [RSL_IE_ACCESS_DELAY]           = { TLV_TYPE_TV },
  54                 [RSL_IE_RACH_LOAD]              = { TLV_TYPE_TLV },
  55                 [RSL_IE_REQ_REFERENCE]          = { TLV_TYPE_FIXED, 3 },
  56                 [RSL_IE_RELEASE_MODE]           = { TLV_TYPE_TV },
  57                 [RSL_IE_RESOURCE_INFO]          = { TLV_TYPE_TLV },
  58                 [RSL_IE_RLM_CAUSE]              = { TLV_TYPE_TLV },
  59                 [RSL_IE_STARTNG_TIME]           = { TLV_TYPE_FIXED, 2 },
  60                 [RSL_IE_TIMING_ADVANCE]         = { TLV_TYPE_TV },
  61                 [RSL_IE_UPLINK_MEAS]            = { TLV_TYPE_TLV },
  62                 [RSL_IE_CAUSE]                  = { TLV_TYPE_TLV },
  63                 [RSL_IE_MEAS_RES_NR]            = { TLV_TYPE_TV },
  64                 [RSL_IE_MSG_ID]                 = { TLV_TYPE_TV },
  65                 [RSL_IE_SYSINFO_TYPE]           = { TLV_TYPE_TV },
  66                 [RSL_IE_MS_POWER_PARAM]         = { TLV_TYPE_TLV },
  67                 [RSL_IE_BS_POWER_PARAM]         = { TLV_TYPE_TLV },
  68                 [RSL_IE_PREPROC_PARAM]          = { TLV_TYPE_TLV },
  69                 [RSL_IE_PREPROC_MEAS]           = { TLV_TYPE_TLV },
  70                 [RSL_IE_IMM_ASS_INFO]           = { TLV_TYPE_TLV },
  71                 [RSL_IE_SMSCB_INFO]             = { TLV_TYPE_FIXED, 23 },
  72                 [RSL_IE_MS_TIMING_OFFSET]       = { TLV_TYPE_TV },
  73                 [RSL_IE_ERR_MSG]                = { TLV_TYPE_TLV },
  74                 [RSL_IE_FULL_BCCH_INFO]         = { TLV_TYPE_TLV },
  75                 [RSL_IE_CHAN_NEEDED]            = { TLV_TYPE_TV },
  76                 [RSL_IE_CB_CMD_TYPE]            = { TLV_TYPE_TV },
  77                 [RSL_IE_SMSCB_MSG]              = { TLV_TYPE_TLV },
  78                 [RSL_IE_FULL_IMM_ASS_INFO]      = { TLV_TYPE_TLV },
  79                 [RSL_IE_SACCH_INFO]             = { TLV_TYPE_TLV },
  80                 [RSL_IE_CBCH_LOAD_INFO]         = { TLV_TYPE_TV },
  81                 [RSL_IE_SMSCB_CHAN_INDICATOR]   = { TLV_TYPE_TV },
  82                 [RSL_IE_GROUP_CALL_REF]         = { TLV_TYPE_TLV },
  83                 [RSL_IE_CHAN_DESC]              = { TLV_TYPE_TLV },
  84                 [RSL_IE_NCH_DRX_INFO]           = { TLV_TYPE_TLV },
  85                 [RSL_IE_CMD_INDICATOR]          = { TLV_TYPE_TLV },
  86                 [RSL_IE_EMLPP_PRIO]             = { TLV_TYPE_TV },
  87                 [RSL_IE_UIC]                    = { TLV_TYPE_TLV },
  88                 [RSL_IE_MAIN_CHAN_REF]          = { TLV_TYPE_TV },
  89                 [RSL_IE_MR_CONFIG]              = { TLV_TYPE_TLV },
  90                 [RSL_IE_MR_CONTROL]             = { TLV_TYPE_TV },
  91                 [RSL_IE_SUP_CODEC_TYPES]        = { TLV_TYPE_TLV },
  92                 [RSL_IE_CODEC_CONFIG]           = { TLV_TYPE_TLV },
  93                 [RSL_IE_RTD]                    = { TLV_TYPE_TV },
  94                 [RSL_IE_TFO_STATUS]             = { TLV_TYPE_TV },
  95                 [RSL_IE_LLP_APDU]               = { TLV_TYPE_TLV },
  96                 [RSL_IE_SIEMENS_MRPCI]          = { TLV_TYPE_TV },
  97                 [RSL_IE_IPAC_PROXY_UDP]         = { TLV_TYPE_FIXED, 2 },
  98                 [RSL_IE_IPAC_BSCMPL_TOUT]       = { TLV_TYPE_TV },
  99                 [RSL_IE_IPAC_REMOTE_IP]         = { TLV_TYPE_FIXED, 4 },
 100                 [RSL_IE_IPAC_REMOTE_PORT]       = { TLV_TYPE_FIXED, 2 },
 101                 [RSL_IE_IPAC_RTP_PAYLOAD]       = { TLV_TYPE_TV },
 102                 [RSL_IE_IPAC_LOCAL_PORT]        = { TLV_TYPE_FIXED, 2 },
 103                 [RSL_IE_IPAC_SPEECH_MODE]       = { TLV_TYPE_TV },
 104                 [RSL_IE_IPAC_LOCAL_IP]          = { TLV_TYPE_FIXED, 4 },
 105                 [RSL_IE_IPAC_CONN_ID]           = { TLV_TYPE_FIXED, 2 },
 106                 [RSL_IE_IPAC_RTP_CSD_FMT]       = { TLV_TYPE_TV },
 107                 [RSL_IE_IPAC_RTP_JIT_BUF]       = { TLV_TYPE_FIXED, 2 },
 108                 [RSL_IE_IPAC_RTP_COMPR]         = { TLV_TYPE_TV },
 109                 [RSL_IE_IPAC_RTP_PAYLOAD2]      = { TLV_TYPE_TV },
 110                 [RSL_IE_IPAC_RTP_MPLEX]         = { TLV_TYPE_FIXED, 8 },
 111                 [RSL_IE_IPAC_RTP_MPLEX_ID]      = { TLV_TYPE_TV },
 112         },
 113 };
 114
 115 /* encode channel number as per Section 9.3.1 */
 116 uint8_t rsl_enc_chan_nr(uint8_t type, uint8_t subch, uint8_t timeslot)
 117 {
 118         uint8_t ret;
 119
 120         ret = (timeslot & 0x07) | type;
 121
 122         switch (type) {
 123         case RSL_CHAN_Lm_ACCHs:
 124                 subch &= 0x01;
 125                 break;
 126         case RSL_CHAN_SDCCH4_ACCH:
 127                 subch &= 0x03;
 128                 break;
 129         case RSL_CHAN_SDCCH8_ACCH:
 130                 subch &= 0x07;
 131                 break;
 132         default:
 133                 /* no subchannels allowed */
 134                 subch = 0x00;
 135                 break;
 136         }
 137         ret |= (subch << 3);
 138
 139         return ret;
 140 }
 141
 142 /* FIXME: convert to value_string */
 143 static const char *rsl_err_vals[0xff] = {
 144         [RSL_ERR_RADIO_IF_FAIL] =       "Radio Interface Failure",
 145         [RSL_ERR_RADIO_LINK_FAIL] =     "Radio Link Failure",
 146         [RSL_ERR_HANDOVER_ACC_FAIL] =   "Handover Access Failure",
 147         [RSL_ERR_TALKER_ACC_FAIL] =     "Talker Access Failure",
 148         [RSL_ERR_OM_INTERVENTION] =     "O&M Intervention",
 149         [RSL_ERR_NORMAL_UNSPEC] =       "Normal event, unspecified",
 150         [RSL_ERR_T_MSRFPCI_EXP] =       "Siemens: T_MSRFPCI Expired",
 151         [RSL_ERR_EQUIPMENT_FAIL] =      "Equipment Failure",
 152         [RSL_ERR_RR_UNAVAIL] =          "Radio Resource not available",
 153         [RSL_ERR_TERR_CH_FAIL] =        "Terrestrial Channel Failure",
 154         [RSL_ERR_CCCH_OVERLOAD] =       "CCCH Overload",
 155         [RSL_ERR_ACCH_OVERLOAD] =       "ACCH Overload",
 156         [RSL_ERR_PROCESSOR_OVERLOAD] =  "Processor Overload",
 157         [RSL_ERR_RES_UNAVAIL] =         "Resource not available, unspecified",
 158         [RSL_ERR_TRANSC_UNAVAIL] =      "Transcoding not available",
 159         [RSL_ERR_SERV_OPT_UNAVAIL] =    "Service or Option not available",
 160         [RSL_ERR_ENCR_UNIMPL] =         "Encryption algorithm not implemented",
 161         [RSL_ERR_SERV_OPT_UNIMPL] =     "Service or Option not implemented",
 162         [RSL_ERR_RCH_ALR_ACTV_ALLOC] =  "Radio channel already activated",
 163         [RSL_ERR_INVALID_MESSAGE] =     "Invalid Message, unspecified",
 164         [RSL_ERR_MSG_DISCR] =           "Message Discriminator Error",
 165         [RSL_ERR_MSG_TYPE] =            "Message Type Error",
 166         [RSL_ERR_MSG_SEQ] =             "Message Sequence Error",
 167         [RSL_ERR_IE_ERROR] =            "General IE error",
 168         [RSL_ERR_MAND_IE_ERROR] =       "Mandatory IE error",
 169         [RSL_ERR_OPT_IE_ERROR] =        "Optional IE error",
 170         [RSL_ERR_IE_NONEXIST] =         "IE non-existent",
 171         [RSL_ERR_IE_LENGTH] =           "IE length error",
 172         [RSL_ERR_IE_CONTENT] =          "IE content error",
 173         [RSL_ERR_PROTO] =               "Protocol error, unspecified",
 174         [RSL_ERR_INTERWORKING] =        "Interworking error, unspecified",
 175 };
 176
 177 const struct value_string rsl_rlm_cause_strs[] = {
 178         { RLL_CAUSE_T200_EXPIRED,       "Timer T200 expired (N200+1) times" },
 179         { RLL_CAUSE_REEST_REQ,          "Re-establishment request" },
 180         { RLL_CAUSE_UNSOL_UA_RESP,      "Unsolicited UA response" },
 181         { RLL_CAUSE_UNSOL_DM_RESP,      "Unsolicited DM response" },
 182         { RLL_CAUSE_UNSOL_DM_RESP_MF,   "Unsolicited DM response, multiple frame" },
 183         { RLL_CAUSE_UNSOL_SPRV_RESP,    "Unsolicited supervisory response" },
 184         { RLL_CAUSE_SEQ_ERR,            "Sequence Error" },
 185         { RLL_CAUSE_UFRM_INC_PARAM,     "U-Frame with incorrect parameters" },
 186         { RLL_CAUSE_SFRM_INC_PARAM,     "S-Frame with incorrect parameters" },
 187         { RLL_CAUSE_IFRM_INC_MBITS,     "I-Frame with incorrect use of M bit" },
 188         { RLL_CAUSE_IFRM_INC_LEN,       "I-Frame with incorrect length" },
 189         { RLL_CAUSE_FRM_UNIMPL,         "Fraeme not implemented" },
 190         { RLL_CAUSE_SABM_MF,            "SABM command, multiple frame established state" },
 191         { RLL_CAUSE_SABM_INFO_NOTALL,   "SABM frame with information not allowed in this state" },
 192         { 0,                            NULL },
 193 };
 194
 195 const char *rsl_err_name(uint8_t err)
 196 {
 197         if (rsl_err_vals[err])
 198                 return rsl_err_vals[err];
 199         else
 200                 return "unknown";
 201 }
 202
 203 /* Section 3.3.2.3 TS 05.02. I think this looks like a table */
 204 int rsl_ccch_conf_to_bs_cc_chans(int ccch_conf)
 205 {
 206         switch (ccch_conf) {
 207         case RSL_BCCH_CCCH_CONF_1_NC:
 208                 return 1;
 209         case RSL_BCCH_CCCH_CONF_1_C:
 210                 return 1;
 211         case RSL_BCCH_CCCH_CONF_2_NC:
 212                 return 2;
 213         case RSL_BCCH_CCCH_CONF_3_NC:
 214                 return 3;
 215         case RSL_BCCH_CCCH_CONF_4_NC:
 216                 return 4;
 217         default:
 218                 return -1;
 219         }
 220 }
 221
 222 /* Section 3.3.2.3 TS 05.02 */
 223 int rsl_ccch_conf_to_bs_ccch_sdcch_comb(int ccch_conf)
 224 {
 225         switch (ccch_conf) {
 226         case RSL_BCCH_CCCH_CONF_1_NC:
 227                 return 0;
 228         case RSL_BCCH_CCCH_CONF_1_C:
 229                 return 1;
 230         case RSL_BCCH_CCCH_CONF_2_NC:
 231                 return 0;
 232         case RSL_BCCH_CCCH_CONF_3_NC:
 233                 return 0;
 234         case RSL_BCCH_CCCH_CONF_4_NC:
 235                 return 0;
 236         default:
 237                 return -1;
 238         }
 239 }
 240
 241 /* Push a RSL RLL header with L3_INFO IE */
 242 int rsl_rll_push_l3(struct msgb *msg, uint8_t msg_type,
 243                     uint8_t chan_nr, uint8_t link_id)
 244 {
 245         uint8_t l3_len = msg->tail - (uint8_t *)msgb_l3(msg);
 246         struct abis_rsl_rll_hdr *rh;
 247
 248         /* construct a RSLms RLL message (DATA INDICATION, UNIT DATA
 249          * INDICATION) and send it off via RSLms */
 250
 251         /* Push the L3 IE tag and lengh */
 252         msgb_tv16_push(msg, RSL_IE_L3_INFO, l3_len);
 253
 254         /* Then push the RSL header */
 255         rh = (struct abis_rsl_rll_hdr *) msgb_push(msg, sizeof(*rh));
 256         rsl_init_rll_hdr(rh, msg_type);
 257         rh->c.msg_discr |= ABIS_RSL_MDISC_TRANSP;
 258         rh->chan_nr = chan_nr;
 259         rh->link_id = link_id;
 260
 261         /* set the l2 header pointer */
 262         msg->l2h = (uint8_t *)rh;
 263
 264         return 0;
 265 }
 266
 267 struct msgb *rsl_rll_simple(uint8_t msg_type, uint8_t chan_nr,
 268                             uint8_t link_id)
 269 {
 270         struct abis_rsl_rll_hdr *rh;
 271         struct msgb *msg = msgb_alloc(sizeof(*rh), "rsl_rll_simple");
 272
 273         if (!msg)
 274                 return NULL;
 275
 276         /* put the RSL header */
 277         rh = (struct abis_rsl_rll_hdr *) msgb_put(msg, sizeof(*rh));
 278         rsl_init_rll_hdr(rh, msg_type);
 279         rh->c.msg_discr |= ABIS_RSL_MDISC_TRANSP;
 280         rh->chan_nr = chan_nr;
 281         rh->link_id = link_id;
 282
 283         /* set the l2 header pointer */
 284         msg->l2h = (uint8_t *)rh;
 285
 286         return msg;
 287 }